480nr_2009-09

Approval of the Manufacturing Process of Metallic Materials

September 2009

Rule Note NR 480 DT R01 E

Marine Division 92571 Neuilly sur Seine Cedex – France

Tel: + 33 (0)1 55 24 70 00 – Fax: + 33 (0)1 55 24 70 25 Marine website: http://www.veristar.com Email: [email protected]

�� 2009 Bureau Veritas - All rights reserved

ARTICLE 1

1.1. - BUREAU VERITAS is a Society the purpose of whose Marine Division (the "Society") is the classi-fication (" Classification ") of any ship or vessel or structure of any type or part of it or system therein col-lectively hereinafter referred to as a "Unit" whether linked to shore, river bed or sea bed or not, whetheroperated or located at sea or in inland waters or partly on land, including submarines, hovercrafts, drillingrigs, offshore installations of any type and of any purpose, their related and ancillary equipment, subseaor not, such as well head and pipelines, mooring legs and mooring points or otherwise as decided by theSociety.

The Society:• prepares and publishes Rules for classification, Guidance Notes and other documents (“Rules”);• issues Certificates, Attestations and Reports following its interventions (“Certificates”);• publishes Registers.

1.2. - The Society also participates in the application of National and International Regulations or Stand-ards, in particular by delegation from different Governments. Those activities are hereafter collectively re-ferred to as " Certification ".1.3. - The Society can also provide services related to Classification and Certification such as ship andcompany safety management certification; ship and port security certification, training activities; all activi-ties and duties incidental thereto such as documentation on any supporting means, software, instrumen-tation, measurements, tests and trials on board.

1.4. - The interventions mentioned in 1.1., 1.2. and 1.3. are referred to as " Services ". The party and/or itsrepresentative requesting the services is hereinafter referred to as the " Client ". The Services are pre-pared and carried out on the assumption that the Clients are aware of the International Maritimeand/or Offshore Industry (the "Industry") practices.1.5. - The Society is neither and may not be considered as an Underwriter, Broker in ship's sale or char-tering, Expert in Unit's valuation, Consulting Engineer, Controller, Naval Architect, Manufacturer, Ship-builder, Repair yard, Charterer or Shipowner who are not relieved of any of their expressed or impliedobligations by the interventions of the Society.

ARTICLE 22.1. - Classification is the appraisement given by the Society for its Client, at a certain date, following sur-veys by its Surveyors along the lines specified in Articles 3 and 4 hereafter on the level of compliance ofa Unit to its Rules or part of them. This appraisement is represented by a class entered on the Certificatesand periodically transcribed in the Society's Register.

2.2. - Certification is carried out by the Society along the same lines as set out in Articles 3 and 4 hereafterand with reference to the applicable National and International Regulations or Standards.

2.3. - It is incumbent upon the Client to maintain the condition of the Unit after surveys, to presentthe Unit for surveys and to inform the Society without delay of circumstances which may affect thegiven appraisement or cause to modify its scope.2.4. - The Client is to give to the Society all access and information necessary for the safe and efficientperformance of the requested Services. The Client is the sole responsible for the conditions of presenta-tion of the Unit for tests, trials and surveys and the conditions under which tests and trials are carried out.

ARTICLE 33.1. - The Rules, procedures and instructions of the Society take into account at the date of theirpreparation the state of currently available and proven technical knowledge of the Industry. Theyare not a standard or a code of construction neither a guide for maintenance, a safety handbookor a guide of professional practices, all of which are assumed to be known in detail and carefullyfollowed at all times by the Client.Committees consisting of personalities from the Industry contribute to the development of those docu-ments.3.2. - The Society only is qualified to apply its Rules and to interpret them. Any reference to themhas no effect unless it involves the Society's intervention.3.3. - The Services of the Society are carried out by professional Surveyors according to the applicableRules and to the Code of Ethics of the Society. Surveyors have authority to decide locally on matters re-lated to classification and certification of the Units, unless the Rules provide otherwise.

3.4. - The operations of the Society in providing its Services are exclusively conducted by way ofrandom inspections and do not in any circumstances involve monitoring or exhaustive verifica-tion.

ARTICLE 4

4.1. - The Society, acting by reference to its Rules:• reviews the construction arrangements of the Units as shown on the documents presented by the Cli-

ent;• conducts surveys at the place of their construction;• classes Units and enters their class in its Register;• surveys periodically the Units in service to note that the requirements for the maintenance of class are

met.

The Client is to inform the Society without delay of circumstances which may cause the date or theextent of the surveys to be changed.

ARTICLE 55.1. - The Society acts as a provider of services. This cannot be construed as an obligation bearingon the Society to obtain a result or as a warranty.5.2. - The certificates issued by the Society pursuant to 5.1. here above are a statement on the levelof compliance of the Unit to its Rules or to the documents of reference for the Services providedfor.In particular, the Society does not engage in any work relating to the design, building, productionor repair checks, neither in the operation of the Units or in their trade, neither in any advisory serv-ices, and cannot be held liable on those accounts. Its certificates cannot be construed as an im-plied or express warranty of safety, fitness for the purpose, seaworthiness of the Unit or of its valuefor sale, insurance or chartering.5.3. - The Society does not declare the acceptance or commissioning of a Unit, nor of its construc-tion in conformity with its design, that being the exclusive responsibility of its owner or builder,respectively.

5.4. - The Services of the Society cannot create any obligation bearing on the Society or constitute anywarranty of proper operation, beyond any representation set forth in the Rules, of any Unit, equipment ormachinery, computer software of any sort or other comparable concepts that has been subject to any sur-vey by the Society.

ARTICLE 66.1. - The Society accepts no responsibility for the use of information related to its Services which was notprovided for the purpose by the Society or with its assistance.

6.2. - If the Services of the Society cause to the Client a damage which is proved to be the directand reasonably foreseeable consequence of an error or omission of the Society, its liability to-wards the Client is limited to ten times the amount of fee paid for the Service having caused thedamage, provided however that this limit shall be subject to a minimum of eight thousand (8,000)Euro, and to a maximum which is the greater of eight hundred thousand (800,000) Euro and oneand a half times the above mentioned fee.The Society bears no liability for indirect or consequential loss such as e.g. loss of revenue, lossof profit, loss of production, loss relative to other contracts and indemnities for termination of oth-er agreements.6.3. - All claims are to be presented to the Society in writing within three months of the date when the Serv-ices were supplied or (if later) the date when the events which are relied on of were first known to the Client,and any claim which is not so presented shall be deemed waived and absolutely barred. Time is to be in-terrupted thereafter with the same periodicity.

ARTICLE 77.1. - Requests for Services are to be in writing.

7.2. - Either the Client or the Society can terminate as of right the requested Services after givingthe other party thirty days' written notice, for convenience, and without prejudice to the provisionsin Article 8 hereunder. 7.3. - The class granted to the concerned Units and the previously issued certificates remain valid until thedate of effect of the notice issued according to 7.2. here above subject to compliance with 2.3. here aboveand Article 8 hereunder.

7.4. - The contract for classification and/or certification of a Unit cannot be transferred neither assigned.

ARTICLE 88.1. - The Services of the Society, whether completed or not, involve, for the part carried out, the paymentof fee upon receipt of the invoice and the reimbursement of the expenses incurred.

8.2. Overdue amounts are increased as of right by interest in accordance with the applicable leg-islation.8.3. - The class of a Unit may be suspended in the event of non-payment of fee after a first unfruitfulnotification to pay.

ARTICLE 9

9.1. - The documents and data provided to or prepared by the Society for its Services, and the informationavailable to the Society, are treated as confidential. However:• clients have access to the data they have provided to the Society and, during the period of classifica-

tion of the Unit for them, to the classification file consisting of survey reports and certificates whichhave been prepared at any time by the Society for the classification of the Unit;

• copy of the documents made available for the classification of the Unit and of available survey reportscan be handed over to another Classification Society, where appropriate, in case of the Unit's transferof class;

• the data relative to the evolution of the Register, to the class suspension and to the survey status of theUnits, as well as general technical information related to hull and equipment damages, are passed onto IACS (International Association of Classification Societies) according to the association workingrules;

• the certificates, documents and information relative to the Units classed with the Society may bereviewed during certificating bodies audits and are disclosed upon order of the concerned governmen-tal or inter-governmental authorities or of a Court having jurisdiction.

The documents and data are subject to a file management plan.

ARTICLE 1010.1. - Any delay or shortcoming in the performance of its Services by the Society arising from an eventnot reasonably foreseeable by or beyond the control of the Society shall be deemed not to be a breach ofcontract.

ARTICLE 1111.1. - In case of diverging opinions during surveys between the Client and the Society's surveyor, the So-ciety may designate another of its surveyors at the request of the Client.

11.2. - Disagreements of a technical nature between the Client and the Society can be submitted by theSociety to the advice of its Marine Advisory Committee.

ARTICLE 1212.1. - Disputes over the Services carried out by delegation of Governments are assessed within theframework of the applicable agreements with the States, international Conventions and national rules.

12.2. - Disputes arising out of the payment of the Society's invoices by the Client are submitted to the Courtof Nanterre, France.

12.3. - Other disputes over the present General Conditions or over the Services of the Society areexclusively submitted to arbitration, by three arbitrators, in London according to the ArbitrationAct 1996 or any statutory modification or re-enactment thereof. The contract between the Societyand the Client shall be governed by English law.

ARTICLE 1313.1. - These General Conditions constitute the sole contractual obligations binding together theSociety and the Client, to the exclusion of all other representation, statements, terms, conditionswhether express or implied. They may be varied in writing by mutual agreement.13.2. - The invalidity of one or more stipulations of the present General Conditions does not affect the va-lidity of the remaining provisions.

13.3. - The definitions herein take precedence over any definitions serving the same purpose which mayappear in other documents issued by the Society.

BV Mod. Ad. ME 545 k - 17 December 2008

MARINE DIVISION

GENERAL CONDITIONS

September 2009

RULE NOTE NR 480

NR 480Approval of the Manufacturing

Process of Metallic Materials

SECTION 1 GENERAL

SECTION 2 STEELMAKING AND ROLLED STEEL PROCUCTS

SECTION 3 SEAMLESS PIPES AND FITTINGS

SECTION 4 WELDED PIPES AND FITTINGS

SECTION 5 STEEL FORGINGS

SECTION 6 STEEL CASTINGS

SECTION 7 WROUGHT ALUMINIUM ALLOY PRODUCTS

SECTION 8 EXPLOSION BONDED ALUMINIUM/STEEL TRANSITION JOINTS

SECTION 9 ANCHOR CHAIN CABLES AND ACCESSORIES FOR SHIPS

2 Bureau Veritas September 2009

NR 480 Approval of the Manufacturing Process ofMetallic Materials

Section 1 General

1 General 7

1.1 Scope1.2 Request for approval1.3 Preliminary information to be submitted1.4 Approval test program1.5 Certification1.6 Renewal of approval1.7 Reconsideration of the approval1.8 Responsibilities of the manufacturer

Section 2 Steelmaking and Rolled Steel Products

1 General 9

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Position of the test samples1.6 Test specimens and testing procedure1.7 Other tests1.8 Results

2 Semi finished products for hull structural steel grades 11

2.1 Scope2.2 Selection of the test product2.3 Extent of the approval tests2.4 Tests on semi finished products

3 Rolled products made in normal and higher strength steelfor hull and other structural applications 11

3.1 Scope3.2 Selection of the test product3.3 Extent of the approval tests3.4 Tests on rolled products3.5 Weldability tests

4 Rolled products made in hull structural steel for high heat input welding 13

4.1 Scope4.2 Application of certification4.3 Confirmation tests4.4 Grade designation

September 2009 Bureau Veritas 3

5 Rolled products made of extra high strength steels 15


6 Rolled products for boilers and pressure vessels 17


7 Rolled products made in ferritic steels for low temperature applications 19


8 Rolled products made in stainless steel 21

8.1 Scope8.2 Specific information to be submitted8.3 Selection of the test product8.4 Extent of the approval tests8.5 Tests on rolled products for austenitic grades (304L, 316L, 316LN, 317L,

317LN)8.6 Tests for austenitic-ferritic grades

9 Round bars for anchor chain cables 23

9.1 Scope9.2 Selection of the test product9.3 Extent of the approval tests9.4 Tests on round bars

10 Clad steel plates 24

10.1 Scope10.2 Specific information to be submitted10.3 Selection of the test product10.4 Extent of the approval tests10.5 Tests on clad plate

11 Plates with specified through thickness properties 25

11.1 Scope11.2 Specific information to be submitted11.3 Selection of the test product11.4 Extent of the approval tests11.5 Tests on plates


Section 3 Seamless Pipes and Fittings

1 Seamless pipes and fittings 26

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Position of the test samples1.6 Test specimens and testing procedure1.7 Selection of the test product 1.8 Extent of the approval tests1.9 Approval tests

Section 4 Welded Pipes and Fittings

1 Welded pipes and fittings 28

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Position of the test samples1.6 Test specimens and testing procedure1.7 Selection of the test product 1.8 Extent of the approval tests1.9 Approval tests

Section 5 Steel Forgings

1 Steel forgings 30

1.1 Scope1.2 Specific information to be submitted for approval1.3 Approval test program

Section 6 Steel Castings

1 Steel castings 31

1.1 Scope1.2 Specific information to be submitted for approval1.3 Approval test program


Section 7 Wrought Aluminium Alloy Products

1 Wrought aluminium alloy products 32

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Position of the test samples1.6 Test specimens and testing procedure1.7 Selection of the test product 1.8 Extent of the approval tests1.9 Tests on base material1.10 Weldability tests

Section 8 Explosion Bonded Aluminium/SteelTransition Joints

1 Explosion bonded aluminium/steel transition joints 34

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Selection of the test product 1.6 Extent of the approval tests1.7 Approval tests1.8 Other tests

Section 9 Anchor Chain Cables and Accessories for Ships

1 Anchor chain cables and accessories for ships 36

1.1 Scope1.2 Specific information to be submitted1.3 Documents to be submitted for changing the approval conditions1.4 Approval survey1.5 Selection of the test product1.6 Extent of the approval tests1.7 Approval tests and documentation

NR 480, Sec 1


SECTION 1 GENERAL

Symbols

A% : Elongation

AISI : American Iron and Steel Institute

Ar3 : Temperature at which ferrite phase starts duringcooling

ASSET test: Visual Assessment of Exfoliation Corrosion Sus-ceptibility of 5xxx Series Aluminium Alloys

ASTM : American Society for Testing and Materials

CEQ : Carbon equivalent

CR : Controlled Rolling

CTOD : Crack Tip Opening Displacement

CTS : Controlled Thermal Severity

HAZ : Heat Affected Zone

HV : Hardness Vickers

IIW : International Institute of Welding

ISO : International Standard Organisation

KV : Charpy V energy

NAMLT : Nitric Acid Mass Loss Test

NDT : Nil Ductility Temperature

Pcm : Parameter of crack measurement

ReH : Yield stress

Rm : Tensile strength

TM : Thermo-mechanical Rolling

UNS : Unified Numbering System.

1 General

1.1 Scope

1.1.1

This document gives the procedure to be followed to obtainthe Society’s approval certificate of material for manufactur-ing process of metallic products in accordance with NR216Rules on Materials and Welding for the Classification ofMarine Units.

Procedures for products and/or grades not explicitelyincluded are subject to special examination by the Society.

1.2 Request for approval

1.2.1

The request for approval is to be submitted to the Societyusing the form obtained from BV office. In addition to thepreliminary information mentioned in [1.3] as applicable,specific information related to the products is to be submit-ted together with the request for approval.

1.3 Preliminary information to be submitted

1.3.1 Preliminary information to be submitted is to include:

a) Name and site address of the manufacturer, location ofthe workshops, general indications relevant to the back-ground, dimensions of the works, total annual produc-tion of finished products for marine applications andothers as deemed useful.

b) Organization and quality

• Organizational chart

• Total number of staff

• Organization of the quality control department;

• Certification of compliance of the quality systemwith ISO 9001 or equivalent, if any

c) Manufacturing facilities

• Flow chart of manufacturing process

• Manufacturing equipments and capacities

• Origin of raw materials

• Storage of raw materials and finished products

• Equipment for systematic control during manufac-turing

d) Details of inspections and quality control facilities

• How are materials and components identified at thevarious manufacturing stages

• Equipment for chemical analysis, metallography,mechanical tests and relevant calibration proce-dures

• Equipment for non-destructive examinations;

• List of quality control procedures

e) Approval(s) already granted by other Classification Soci-eties and relevant approval test reports as deemed use-ful.

1.4 Approval test program

1.4.1 Unless otherwise agreed, the manufacturer shall sub-mit for review an approval test program.

Typical approval programs for the various products aregiven in the relevant articles.

The approval tests are in general to be witnessed by theSociety’s surveyor at the manufacturer’s works. If the testingfacilities are not available at the manufacturer’s works, thetests are to be carried out by recognised laboratories andwitnessed by the Society’s surveyor.

NR 480, Sec 1


1.5 Certification

1.5.1 Approval certificate

Upon satisfactory completion of the procedure, an approvalcertificate will be issued by the Society.The validity of the approval is to be a maximum of fiveyears.

1.5.2 List of approval certificatesThe approval certificates issued to manufacturers areentered in a list containing the scope and the main condi-tions of approval available for consultation on the internetsite “ www.veristar.com ”.

1.6 Renewal of approval

1.6.1 The manufacturer shall apply for renewal of theapproval certificate before the date of expiry. Renewal canbe carried out by an audit and assessment of survey results,if satisfactory, during the period.Manufacturers who have not produced the approved prod-ucts during the period between renewals will be required tocarry out approval tests or at the discretion of the Society,submit the results of production of similar products.

1.7 Reconsideration of the approval

1.7.1 During the period of validity, the approval may bereconsidered in the following cases:

a) In service failures, traceable to product quality

b) Major non conformity during testing of the product ornon conformity revealed during fabrication and con-struction

c) Breakdown of the Manufacturer’s Quality System

d) Changes brought by the Manufacturer, without prelimi-nary agreement of the Society, to the extent of theapproval defined at the time of the approval.

1.8 Responsibilities of the manufacturer

1.8.1 The Manufacturer is fully responsible for the qualityof the finished product and ensuring compliance with thespecified requirements, as checked on the specimens sub-jected to the approval tests.

The routine production of approved products shall be car-ried out according to the same procedures followed for themanufacture of specimens submitted to approval tests.

The manufacturer shall give prior warning to the Society ofany significant modifications to the manufacturing and con-trol procedures. The Society may at its discretion, requirefurther tests and surveys deemed necessary to extend theapproval to the new manufacturing conditions.

The manufacturer shall keep up-to-date records coveringthe manufacture and quality control of the products; therecords shall contain details allowing the identification ofthe various productions, original materials, heat treatmentand results of tests and examinations carried out. The Soci-ety’s surveyor is to have easy access to these records asdeemed necessary.

NR 480, Sec 2


SECTION 2 STEELMAKING AND ROLLED STEEL PRODUCTS

1 General

1.1 Scope

1.1.1 This Section gives the approval scheme for steelmak-ing and rolling products made in hull structural steel grades,extra high strength steel grades, steel grades for boilers andpressure vessels, steel grades for low temperature applica-tions, stainless steel grades and chain cable steel grades.

1.2 Specific information to be submitted

1.2.1 The following information is to be supplied by themanufacturer for all steel grades except for stainless steelgrades (refer to [8]):

a) Type of products (plates, sections, coils), grades of steel,range of thickness and aim material properties, as fol-lows:

• Range of chemical composition and aim analyses,including grain refining, micro alloying and residualelements, for the various grades of steel; if the rangeof chemical composition depends on thickness andsupply condition, the different ranges are to be spec-ified, as appropriate

• Aim maximum carbon equivalent according to IIWformula

• Aim maximum Pcm content for higher strengthgrades with low carbon content C < 0,13 %

• Production statistics of the chemical compositionand mechanical properties (ReH , Rm , A% and KV).The statistics are intended to demonstrate the capa-bility to manufacture the steel products in accor-dance with the requirements.

b) Steelmaking

• Steelmaking process and capacity of furnace(s) orconverter(s)

• Raw material used

• Deoxidation and alloying practice

• Desulphurisation and vacuum degassing installa-tions, if any.

c) Casting methods: ingot or continuous casting

In the case of continuous casting, information relevantto type of casting machine, teeming practice, methodsto prevent re-oxidation, inclusions and segregation con-trol, presence of electromagnetic stirring, soft reduction,etc., is to be provided as appropriate

• Ingot or slab size and weight

• Ingot or slab treatment: scarfing and discarding pro-cedures.

d) Reheating and rolling

• Type of furnace and treatment parameters

• Rolling: reduction ratio of slab/bloom/billet to fin-ished product thickness, rolling and finishing tem-peratures

• Descaling treatment during rolling

• Capacity of the rolling stands.

e) Heat treatment

• Type of furnaces, heat treatment parameters andtheir relevant records

• Accuracy and calibration of temperature controldevices.

f) Programmed rolling

For products delivered in the controlled rolling (CR) orthermo-mechanical rolling (TM) condition, the follow-ing additional information on the programmed rollingschedules is to be given:

• Description of the rolling process

• Normalizing temperature, re-crystallization temper-ature and Ar3 temperature and the methods used todetermine them

• Control standards for typical rolling parameters usedfor the different thickness and grades of steel (tem-perature and thickness at the beginning and at theend of the passes, interval between passes, reduc-tion ratio, temperature range and cooling speed ofaccelerated cooling, if any) and relevant method ofcontrol

• Calibration of the control equipment.

g) Recommendations for working and welding in particu-lar for products delivered in the CR or TM condition

• Cold and hot working recommendations if neededin addition to the normal practice used in the ship-yards and workshops

• Minimum and maximum heat input if different fromthe ones usually used in the shipyards and work-shops (15 - 50 kJ/cm).

h) Where any part of the manufacturing process is assignedto other companies or other manufacturing plants, addi-tional information required by the Society is to beincluded.

i) For the approval of the semi-finished products such asslabs, blooms and billets, the above information a), b)and c) is to be given.

NR 480, Sec 2


1.3 Documents to be submitted for changingthe approval conditions

1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request ofchanging the approval conditions, in the case of the follow-ing a) through e):

a) Change of the manufacturing process (steel making,casting, rolling and heat treatment)

b) Change of the maximum thickness (dimension)

c) Change of the chemical composition, added element,etc.

d) Subcontracting the rolling, heat treatment, etc.

e) Use of the slabs, blooms and billets manufactured byother companies which are not approved.

However, where the documents are duplicated by the onesat the previous approval for the same type of product, partor all of the documents may be omitted except the approvaltest program.

1.4 Approval survey

1.4.1 The approval tests are to be witnessed by the Sur-veyor at the manufacturer’s plant and the execution of theplant inspection in operation may be required by the Sur-veyor during the visit for the approval.

If the testing facilities are not available at the works, thetests are to be carried out at recognised laboratories.

1.5 Position of the test samples

1.5.1 The test samples are to be taken, unless otherwiseagreed, from the product (plate, flat, section, bar) corre-sponding to the top of the ingot, or, in the case of continu-ous casting, a random sample.

The position of the samples to be taken in the length of therolled product, and the direction of the test specimens withrespect to the final direction of rolling of the material areindicated in the relevant table for the material.

The position of the samples in the width of the product is tobe in compliance with NR216 Materials and Welding, Ch 2,Sec 1, [1.8].

1.6 Test specimens and testing procedure

1.6.1 The test specimens and testing procedures are to bein accordance with NR216 Materials and Welding, Ch 1,Sec 2, unless agreed otherwise.

In particular the following applies:

a) Tensile test

• For plates made from hot rolled strip one additionaltensile specimen is to be taken from the middle ofthe strip constituting the coil

• For plates having thickness greater than 40 mm,when the capacity of the available testing machineis insufficient to allow the use of test specimens offull thickness, multiple flat specimens, representingcollectively the full thickness, can be used. Alterna-tively two round specimens with the axis located atone quarter and at mid-thickness can be taken.

b) Impact test

• For plates made from hot rolled strip one additionalset of impact specimens is to be taken from the mid-dle of the strip constituting the coil

• For plates having thickness greater than 40 mm oneadditional set of impact specimens is to be takenwith the axis located at mid-thickness

• In addition to the determination of the energy value(Joule), the lateral expansion and the percentagecrystallinity are to be reported for each specimen.

c) Chemical composition

In general the content of the following elements is to bechecked: C, Mn, Si, P, S, Ni, Cr, Mo, Al, N, Nb, V, Cu,As, Sn. Ti and, for steel manufactured from electric oropen-hearth furnace, Sb and B. The material for thecheck analysis should be taken from the tensile testspecimen. Both the ladle and product analysis are to bereported.

d) Sulphur prints

Sulphur prints are to be taken from plate edges whichare perpendicular to the axis of the ingot or slab.

They are to be approximately 600 mm long taken fromthe centre of the edge selected, i.e. on the ingot centre-line, and are to include the full plate thickness.

e) Micrographic examination

The micrographs are to be representative of the fullthickness. For thick products in general at least threeexaminations are to be made at surface, one quarter andmid-thickness of the product.

All photomicrographs are to be taken at x100 magnifi-cation and where ferrite grain size exceeds ASTM 10,additionally at x500 magnification. Where applicable,ferrite grain size should be determined for each photo-micrograph.

f) Drop weight test

When required the test is to be performed in accor-dance with ASTM E208. The Nil Ductility Transitiontemperature (NDT) is to be determined and photographsof the tested specimens are to be taken and enclosedwith the test report.

The test results are to be in accordance, where applicable,with the requirements specified for the different steel gradesin NR216 Materials and Welding, Ch 2, Sec 1.

NR 480, Sec 2


1.7 Other tests

1.7.1 Additional tests such as CTOD test, large scale brittlefracture tests (Double Tension test, ESSO test, Deep Notchtest, etc) or other tests may be required in the case of newlydeveloped type of steel, outside the scope of NR216 Materi-als and Welding, Ch 2, Sec 1, [2], or when deemed neces-sary by the Society.

1.8 Results

1.8.1 All the results, which are in any case to comply withthe requirements of NR216 Materials and Welding, areevaluated for the approval; depending on the results, partic-ular limitations or testing conditions, as deemed appropri-ate, may be specified in the approval document.

All the information required under [1.2], applicable to theproducts submitted to the tests, is to be collected by the man-ufacturer and put in the file which will include all the resultsof the tests and operation records relevant to steel making,casting, rolling and heat treatment of the test products.

2 Semi finished products for hullstructural steel grades

2.1 Scope

2.1.1 This article specifies the scheme for the approval ofthe manufacturing process of semi finished products such asingots, slabs, blooms and billets for the hull structural steels.

2.2 Selection of the test product

2.2.1 For each grade of steel and for each manufacturingprocess (e.g. steel making, casting, rolling and condition ofsupply), one test product with the maximum thickness andone test product with the minimum thickness to beapproved are in general to be selected for each kind ofproduct (ingots, slabs, blooms/billets).

The selection of the casts for the test product is to be basedon the typical chemical composition, with particular regardto the specified CEQ or Pcm values and grain refining micro-alloying additions.

2.3 Extent of the approval tests

2.3.1 The extent of the test program is specified in [2.4]; itmay be modified on the basis of the preliminary informationsubmitted by the manufacturer.

In particular a reduction of the indicated number of casts,product thicknesses and grades to be tested or completesuppression of the approval tests may be accepted by theSociety taking into account:

a) Approval already granted by other Classification Societ-ies and documentation of approval tests performed.

b) Grades of steel to be approved and availability of longterm statistic results of chemical properties and ofmechanical tests performed on rolled products.

c) Change of the approval conditions.On the other hand, an increase of the number of casts andthicknesses to be tested may be required in the case ofnewly developed types of steel or manufacturing processes.

Where the number of tests differs from those shown in[2.4], the program is to be confirmed by the Society beforethe tests are carried out.

2.4 Tests on semi finished products

2.4.1 Type of testsThe tests to be carried out for the approval of the manufac-turing process of semi finished products are:• Chemical analysis. The analysis is to be complete and is

to include micro-alloying elements.• Sulphur prints.

In addition, for initial approval and for any upgrade of theapproval, the Society will require full tests indicated in thissection to be performed at rolling mill on the minimumthickness semi finished product.

In case of multi-caster work, full tests on finished productsshall be carried out for one caster and reduced tests (chemi-cal analysis and sulphur print) for the others. The selectionof the caster shall be based on the technical characteristicsof the casters to be evaluated on case by case basis. Testsare to be performed at rolling mill on products manufac-tured from the minimum thickness semi finished product.

3 Rolled products made in normal andhigher strength steel for hull andother structural applications

3.1 Scope

3.1.1 This Article gives the approval test program for themanufacture of normal and higher strength hull and struc-tural steel products in groups A, B, D, E and AH32, DH32,EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40,EH40 and FH40.


3.2.1 For each grade of steel and for each manufacturingprocess (e.g. steel making, casting, rolling and condition ofsupply), one test product with the maximum thickness(dimension) to be approved is in general to be selected foreach kind of product.In addition, for initial approval, the Society will requireselection of one test product of average thickness.



3.3.1 The extent of the test program is specified in [3.4] and[3.5]; it may be modified on the basis of the preliminaryinformation submitted by the manufacturer.

NR 480, Sec 2


In particular a reduction of the indicated number of casts,steel plate thicknesses and grades to be tested or completesuppression of the approval tests may be accepted by theSociety taking into account:


b) Grades of steel to be approved and availability of longterm statistic results of chemical and mechanical prop-erties.

c) Approval for any grade of steel also covers approval forany lower grade in the same strength level, providedthat the aim analysis, method of manufacture and con-dition of supply are similar.

d) For higher tensile steels, approval of one strength levelcovers the approval of the strength level immediatelybelow, provided the steelmaking process, deoxidationand fine grain practice, casting method and condition ofsupply are the same.

e) Change of the approval conditions.

f) Approval of the semi-finished products such as slabs,blooms and billets.

On the other hand, an increase of the number of casts andthicknesses to be tested may be required in the case ofnewly developed types of steel or manufacturing processes.

In case of multi-source slabs or changing of slab manufac-turer, the rolled steel manufacturer is required to obtain theapproval of the manufacturing process of rolled steels usingthe slabs from each slab manufacturer and to conductapproval tests in accordance with [3.4].

• The rolled steel manufacturer has already beenapproved for the manufacturing process using othersemi finished products characterized by the same thick-ness, steel grade, grain refining and micro-alloying ele-ments, steelmaking and casting process.

• The semi finished products manufacturer has beenapproved for the complete manufacturing process withthe same conditions (steelmaking, casting, rolling andheat treatment) for the same steel types.

Where the number of tests differs from those shown in [3.4]and [3.5], the program is to be confirmed by the Societybefore the tests are carried out.

3.4 Tests on rolled products

3.4.1 The tests to be carried out are indicated in Tab 1.

3.5 Weldability tests

3.5.1 General

Weldability tests are required for plates and are to be car-ried out on samples of the thickest plate.

Tests are required for normal strength grade E and for higherstrength steels.

3.5.2 Preparation and welding of the test assemblies

The following tests are in general required:

a) 1 butt weld test assembly welded with a heat inputapproximately 15 kJ/cm

b) 1 butt weld test assembly welded with a heat inputapproximately 50 kJ/cm.

The butt weld test assemblies are to be prepared with theweld seam transverse to the plate rolling direction, so thatimpact specimens will result in the longitudinal direction.

The bevel preparation should be preferably 1/2V or K.

The welding procedure should be as far as possible inaccordance with the normal welding practice used at theyards for the type of steel in question.

The welding parameters including consumables designationand diameter, pre-heating temperatures, interpass tempera-tures, heat input, number of passes, etc. are to be reported.

3.5.3 Type of tests

From the test assemblies the following test specimens are tobe taken:

a) 1 cross weld tensile test

b) a set of 3 Charpy V-notch impact specimens transverseto the weld with the notch located at the fusion line andat a distance 2, 5 and minimum 20 mm from the fusionline. The fusion boundary is to be identified by etchingthe specimens with a suitable reagent. The test tempera-ture is to be the one prescribed for the testing of thesteel grade in question.

c) Hardness tests HV 5 across the weldment. The indenta-tions are to be made along a 1 mm transverse linebeneath the plate surface on both the face side and theroot side of the weld as follows:

• Fusion line

• HAZ: at each 0,7 mm from fusion line into unaf-fected base material (6 to 7 minimum measurementsfor each HAZ)

• The maximum hardness value should not be higherthan 350 HV.

A sketch of the weld joint depicting groove dimensions,number of passes, hardness indentations should be attachedto the test report together with photomacrographs of theweld cross section.

3.5.4 Other tests

Additional tests such as cold cracking tests (CTS, cruciform,implant, Tekken, bead on plate), CTOD, or other tests maybe required in the case of newly developed type of steel,outside the scope of NR216 Materials and Welding, Ch 2,Sec 1, [2], or when deemed necessary by the Society.

NR 480, Sec 2


Table 1 : Tests on rolled products

4 Rolled products made in hull structuralsteel for high heat input welding

4.1 Scope

4.1.1 The application for weldability confirmation schemeis optional for manufacturers. The wledability confirmationscheme is intended to assess the weldability for high heatinput welding under testing conditions.

This Article specifies the weldability confirmation schemeof normal and higher strength hull structural steel stipulatedin [3] intended for welding with high heat input over50kJ/cm.

Demonstration of conformance to the requirements of thisdocument approves a particular steel mill to manufacturegrade of steel to the specific chemical composition range,melting practice, and processing practice for which con-formance was established. The approval scheme does notapply to qualification of welding procedures to be under-taken by the shipyards.

Type of testPosition of the samples

and direction of the test specimens (1)

Remarks

Tensile test Top and bottom - transverse (2)

ReH, Rm , A5(%), RA(%) are to be reported

Tensile test (stress relieved) only for TM steels Top and bottom - transverse (2)

Stress relieving at 600°C(2 min/mm with minimum 1 hour)

Impact test (3) on non agedspecimensfor grades:

A, B, AH32, AH36, AH40

Top and bottom - longitudinal

Testing temperature (°C):

+20 0 −20

D, DH32, DH36, DH40 0 −20 −40

E, EH32, EH36, EH40 0 −20 −40 −60

FH32, FH36, FH40 −20 −40 −60 −80

A, B, AH32, AH36, AH40

Top - transverse (4)Testing temperature (°C):

+20 0 −20

D, DH32, DH36, DH40 0 −20 −40

E, EH32, EH36, EH40 −20 −40 −60

FH32, FH36, FH40 −40 −60 −80

Impact test (3) on strain aged specimens (5) for grades:

AH32, AH36, AH40

Top - longitudinalTesting temperature (°C):

+20 0 −20

D, DH32, DH36, DH40 0 −20 −40

E, EH32, EH36, EH40 −20 −40 −60

FH32, FH36, FH40 −40 −60 −80

Chemical composition (6) Top Complete analysis including micro alloying elements

Sulphur prints Top

Micro examination Top

Grain size determination Top Only for fine grain steels

Drop weight test (4) Top Only for grades E, EH32, EH36, EH40, FH32, FH36, FH40 - Determination of NDT

Through thickness tensile tests Top and bottom Only for grades with improved throughthickness properties

(1) For hot rolled strips see [1.6].(2) Longitudinal direction for sections and plates having width less than 600 mm.(3) One set of 3 Charpy V-notch impact specimens is required for each impact test.(4) Not required for sections and plates having width less than 600 mm.(5) Deformation 5% + 1 hour at 250°C.(6) Besides product analyses, ladle analyses are required.

NR 480, Sec 2


4.2 Application of certification

4.2.1 The manufacturer is to submit to the Society, requestof certification, proposed weldability test program (see[4.3.2]] and technical documents relevant to:

a) Outline of steel plate to be certified

• grade

• thickness range

• deoxydation practice

• fine grain practice

• aim range of chemical composition

• aim maximum Ceq and Pcm

• production statistics of mechanical properties (ten-sile and Charpy V-notch impact test, if any.

b) Manufacturing control points to prevent toughness dete-rioration in heat affected zone when welded with highheat input, relevant to chemical elements, steelmaking,casting, rolling, heat treatment, etc.

c) Welding control points to improve joint properties onstrength and toughness, if any.

4.3 Confirmation tests

4.3.1 Range of certificationRange of certification for steel grades is to be the followinga) trough e) unless otherwise agreed by the Society:

a) Approval tests on the lowest and highest toughness lev-els cover the intermediate toughness level

b) Approval tests on normal strength cover that strengthlevel only

c) For high tensile steels, approval tests on one strengthlevel cover strength level immediately below

d) Tests may be carried out separately subject to the samemanufacturing process

e) Certification and documentation of confirmation testsperformed by other Classification Society may beaccepted at the discretion of the Society.

4.3.2 Weldability test programExtent of the test program is specified in [4.3.5] but it maybe modified according to the content of certification. In par-ticular, additionnal test assemblies and/or test items may berequired in the case of newly developed type of steel, weld-ing consumable and welding method, or when deemednecessary by the Society.

Where the content of tests differs from those specified in[4.3.5], the program is to be confirmed by the Societybefore the tests are carried out.

4.3.3 Test plateTest plate is to be manufactured by a process approved bythe Society in accordance with the requirements of [3].

For each manufacturing process route, two test plates withdifferent thickness are to be selected. The thicker plate (t)and the thinner plate (less than or equal to t/2) are to be pro-posed by the manufacturer.

Small changes in manufacturing processing (e.g. within theTMCP process) may be considered for acceptance withouttesting, at the discretion of the Society.

4.3.4 Test assembly

One butt weld assembly welded with heat input over50kJ/cm is to be generally prepared with the weld axistransverse to the plate rolling direction.

Dimensions of the test assembly are to be amply sufficientto take all the required test specimens specified in [4.3.5].

The welding procedures should be as far as possible inaccordance with the normal practices applied at shipyardsfor the test plate concerned.

Welding process, welding position, welding consumable(manufacturer, brand, grade, diameter and shield gas) andwelding parameters including bevel preparation, heat input,preheating temperatures, interpass temperatures, number ofpasses, etc. are to be reported.

4.3.5 Examinations and tests for the test assembly

The test assembly is to be examined and tested in accor-dance with the following a) through h) unless otherwiseagreed by the Society.

a) Visual examination: Overall welded surface is to be uni-form and free from injurious defects such as cracks,undercuts, overlaps, etc.

b) Macroscopic test: One macroscopic photograph is to berepresentative of transverse section of the welded jointand is to show absence of cracks, lack of penetration,lack of fusion and other injurious defects.

c) Microscopic test: Along mid-thickness line across trans-verse section of the weld, one micrograph with x100magnification is to be taken at each position of the weldmetal centreline, fusion line and at a distance 2, 5, 10and minimum 20 mm from the fusion line. The testresult is provided for information purpose only.

d) Hardness test: Along two line across transverse weldsection 1 mm beneath plate surface on both face androot side of the weld, indentations by HV5 are to bemade at weld metal centreline, fusion line and each 0.7mm from fusion line to unaffected base metal (minimum6 to 7 measurements for each heat affected zone).

The maximum hardness value should not be higher than350 HV.

e) Transverse tensile test: Two transverse (cross weld) ten-sile specimens are to be taken from the test assembly.Test specimens and testing procedures are to complywith the requirements of NR216 Materials and Welding,Ch 1, Sec 2.

The tensile strength is to be not less than the minimumrequired value for the grade of base metal.

f) Bend test: Two transverse (cross weld) test specimens areto be taken from the test assembly and bent on a man-drel with diameter of quadruple specimen thickness.Bending angle is to at least 120°. Test specimens are tocomply with the requirements of NR216 Materials andWelding, Ch 1, Sec 2.

NR 480, Sec 2


For plate thickness up to 20 mm, one face-bend and oneroot-bend specimens or two side-bend specimens are tobe taken.

After testing, the test specimens shall not reveal anycrack nor other open defect in any direction greater than3 mm.

g) Impact test: Charpy V-notch impact specimens (threespecimens for one set) are to be taken within 2 mmbelow plate surface on face side of the weld with thenotch perpendicular to the plate surface.

One set of the specimens transverse to the weld is to betaken with the notch located at the fusion line and atdistance 2, 5 and minimum 20 mm from the fusion line.The fusion boundary is to be identified by etching thespecimens with a suitable reagent. The test temperatureis to be the one prescribed for the testing of the steelgrade in question.

For steel plate with thickness greater than 50 mm or oneside welding for plate thickness greater than 20 mm,one additionnal set of the specimens is to be taken fromthe root side of the weld with the notch located at eachthe same position as for the face side.

The average impact energy at the specified test tempera-ture is to comply with NR216 Materials and Welding,Ch 2, Sec 1, Tables 4 & 7 depending on the steel gradeand thickness.

h) Other test: Additional tests such as wide-width tensiletest, HAZ tensile test, cold cracking tests (CTS, Cruci-form, Implant, Tekken and Bead-on plate), CTOD orother tests should be required at the discretion of theSociety (see [4.3.2]).

4.4 Grade designation

4.4.1 Upon issuance of the certificate, the notation indicat-ing the value of heat input applied in the confirmation testmay be added to the grade designation on the test plate, e.g.“EH36-W300” (in the case of heat input 300kJ/cm applied).The value of this notation is not to be less than 50 and every10 added.

5 Rolled products made of extra highstrength steels

5.1 Scope

5.1.1 This Article gives the approval test program for themanufacture of extra high strength structural steel productsmade of grades A, B, D, E in the yield strength groups 420,460, 500, 550, 620, 690.


5.2.1 For each grade of steel and for each manufacturingprocess (e.g. steel making, casting, rolling and condition ofsupply), two products (one per cast) from two different castsrepresenting average and maximum thickness (dimension)to be approved are in general to be selected for each kind ofproduct.








d) Approval of one yield strength level covers the approvalof the yield strength level immediately below, providedthe steelmaking process, deoxidation and fine grainpractice, casting method and condition of supply arethe same.







NR 480, Sec 2




5.5.1 GeneralWeldability tests are required for plates and are to be car-ried out on samples of the thickest plate.

5.5.2 Preparation and welding of the test assembliesThe following tests are in general required:

a) 1 butt weld test assembly welded with a heat inputequal to the minimum heat input recommended by thesteelmaker,

b) 1 butt weld test assembly welded with a heat inputequal to the maximum heat input recommended by thesteelmaker.

The butt weld test assemblies are to be prepared with theweld seam parallel to the plate rolling direction, so thatimpact specimens will result in the transverse direction.

The bevel preparation should be preferably 1/2V or Kdepending on the thickness.


The welding parameters including consumables brandname, designation and diameter, pre-heating temperatures,interpass temperatures, heat input, number of passes, etc.are to be reported.

5.5.3 Type of tests



b) a set of 3 Charpy V-notch impact specimens transverseto the weld with the notch located at the fusion line andat a distance 1, 3, 5, 7 and minimum 20 mm from thefusion line. The fusion boundary is to be identified byetching the specimens with a suitable reagent. The testtemperature is to be the one prescribed for the testing ofthe steel grade in question. The average impact energyshall exceed 27 J.


• Weld metal, at each 2 mm

• Fusion line

• HAZ: at each 0,5 mm from fusion line into unaf-fected base material

• The maximum hardness value should not be higherthan 420 HV. The steelmaker should indicate themaximum hardness level for avoiding hydrogeninduced cracking.

Type of testPosition of the samples and direction of the test

specimens (1)Remarks

Tensile test Top and bottom -transverse (2)


Tensile test (stress relieved) only for CR or TM+AcC steels Top and bottom -transverse (2)

Stress relieving at 600 °C(2 min/mm with minimum 1 hour)

Impact tests (3) on non aged specimens for grades:

A420, A460, A500, A550, A620, A690Top and bottom - longitudinal and trans-verse


+20 0 −20

D420, D460, D500, D550, D620, D690 +20 0 −20 −40

E420, E460, E500, E550, E620, E690 +20 0 −20 −40 −60

F420, F460, F500, F550, F620, F690 +20 0 −20 −40 −60 −80

Impact test (3) on strain aged specimens (5) for grades:

A420, A460, A500, A550, A620, A690Top and bottom - longitudinal and trans-verse


+20 0

D420, D460, D500, D550, D620, D690 +20 0 −20

E420, E460, E500, E550, E620, E690 +20 0 −20 −40

F420, F460, F500, F550, F620, F690 +20 0 −20 −40 −60

Chemical composition From top tensile speci-men

Complete analysis including micro alloying ele-ments

Sulphur prints Top


Drop weight test (4) Top Determination of NDT

(1) For hot rolled strips see [1.6](2) Longitudinal direction for sections and plates having width less than 600 mm.(3) One set of 3 Charpy V-notch impact specimens is required for each impact test.(4) Not required for sections and plates having width less than 600 mm.(5) Deformation 5% + 1 hour at 250°C.

NR 480, Sec 2



Where a stress relieving treatment may be needed (plateswith thickness above 50mm), cross weld tensile and CharpyV-notch impact tests are to be repeated in the stress relievedconditions.

5.5.4 Other tests

Additional tests such as cold cracking tests (CTS, cruciform,implant, Tekken, bead on plate), CTOD, or other tests maybe required when deemed necessary by the Society.

6 Rolled products for boilers andpressure vessels

6.1 Scope

6.1.1 This Article gives the approval test program for themanufacture of carbon manganese steel products made ofgrades (360HA, 360HB, 360HD, 410HA, 410HB, 410HD,460HB, 460HD, 510HB, 510HD) and low alloy steel grades(0,3Mo - 1Cr0,5Mo - 2,25Cr1Mo) for boilers and pressurevessels.



An additional product from another cast is to be tested forgrades intended for application at elevated temperatures(boilers).
















6.5.1 General








The welding procedure should be as far as possible inaccordance with the normal welding practice used at themanufacturing shop for the type of steel in question.


NR 480, Sec 2



6.5.3 Type of tests

From the test assemblies the following test specimens are tobe taken :


b) a set of 3 Charpy V-notch impact specimens transverseto the weld with the notch located at the fusion line andat a distance 2, 5 and minimum 20 mm from the fusionline. The fusion boundary is to be identified by etchingthe specimens with a suitable reagent. The test tempera-ture is to be the one prescribed for the testing of thesteel grade in question. The minimum average impactenergy shall exceed 27 J for carbon-manganese steelsand 31 J for low alloy steels.

c) Hardness tests HV 5 across the weldment. The indenta-tions are to be made along a 1 mm transverse linebeneath the plate surface on both the face side and theroot side of the weld as follows :• Weld metal, at each 2 mm• Fusion line• HAZ: at each 0,5 mm from fusion line into unaf-

fected base material• The maximum hardness value should not be higher

than 320 HV.A sketch of the weld joint depicting groove dimensions,number of passes, hardness indentations should be attachedto the test report together with photomacrographs of theweld cross section.



Remarks



Tensile test (stress relieved) only for CR or TM+AcC steels

Top and bottom - transverse (2)

Stress relieving at 600 °C (2 min/mm with minimum 1 hour)

Tensile test at elevatedtemperature (grades intended for applications at elevated temperat.)

360, 410, 460, 510

Top - transverseTestingtemperature (°C)

+100 or +150 mini.

interm. temp

+400

Low alloy grades +200 mini. maximum of the range

Impact tests (3)

on non aged specimens for grades:

360HA, 410HA

Top and bottom -longitudinal and transverse

Testingtemperature (°C)

+20 0

360HB, 410HB, 460HB, 510HB

+20 0 -20

360HD, 410HD, 460HD, 510HD

+20 0 -20 -40

Low alloy grades +20 0

Impact test (3)on strain aged specimens (5) for grades :

360HA, 410HA

Top and bottom - transverse

Testingtemperature (°C)

+20

360HB, 410HB, 460HB, 510HB

+20 0

360HD, 410HD, 460HD, 510HD

+20 0 -20

Low alloy grades 0

Chemical composition From top tensile specimen Complete analysis including micro alloying elements

Sulphur prints Top



(1) For hot rolled strips see [1.6].(2) Longitudinal direction for sections and plates having width less than 600 mm.(3) One set of 3 Charpy V-notch impact specimens is required for each impact test.(4) Not required for sections and plates having width less than 600 mm.(5) Deformation 5% + 1 hour at 250°C.

NR 480, Sec 2


Where a stress relieving treatment is required, cross weldtensile and Charpy V-notch impact tests are to be repeatedin the stress relieved conditions.

6.5.4 Other tests


7 Rolled products made in ferritic steelsfor low temperature applications

7.1 Scope

7.1.1 This Article gives the approval test program for themanufacture of ferritic steel products for low temperatureapplications including carbon manganese steels grade LE orLF in the tensile strength groups 410, 460, 510 and 550 andnickel steels grade 1,5Ni - 3,5Ni - 5,0Ni and 9,0Ni.



The selection of the casts for the test product is to be basedon the typical chemical composition, with particular regardto the specified CEQ or Pcm values and grain refining micro-

alloying additions.






c) Approval for any grade of steel also covers approval forany lower grade in the same strength level, provided

that the aim analysis, method of manufacture and con-dition of supply are similar.







7.4.1 The tests to be carried out are indicated inTab 4.


7.5.1 General










NR 480, Sec 2



7.5.3 Type of tests



b) a set of 3 Charpy V-notch impact specimens transverseto the weld with the notch located at the fusion line andat a distance 1, 3, 5, 7 and minimum 20 mm from thefusion line. The fusion boundary is to be identified byetching the specimens with a suitable reagent. The testtemperature is to be the one prescribed for the testing ofthe steel grade in question. The minimum averageimpact energy shall exceed 27 J.


• Weld metal, at each 2 mm

• Fusion line

• HAZ: at each 0,5 mm from fusion line into unaf-fected base material

d) The maximum hardness value should not be higherthan:

• 320 HV for carbon manganese, 1,5Ni and 3,5Nisteels

• 400HV for 5,0Ni and 9,0Ni steel grades.


Where a stress relieving treatment may be needed (plateswith thickness above 50 mm), cross weld tensile andCharpy V-notch impact tests are to be repeated in the stressrelieved conditions.

7.5.4 Other tests




Remarks



Impact tests (3) on non aged specimens for grades:

410LE, 460LE, 510LE, 560LE


Testingtemperature(°C):

0 −20 −40 −60

410LF, 460LF, 510LF, 560LF 0 −20 −40 −60 −80

1,5Ni −40 −60 −80 −100

3,5Ni −60 −80 −100 −120

5,0Ni −80 −100 −120 −196

9,0Ni −80 −100 −163 −196

Impact test (3) on strain aged specimens (5) for grades :

410LE, 460LE, 510LE, 560LE


Testingtemperature(°C):

−20 −40

410LF, 460LF, 510LF, 560LF −40 −60

1,5Ni −60 −80

3,5Ni −80 −95

5,0Ni −80 −110

9,0Ni −163 −196


Sulphur prints Top



(1) For hot rolled strips see [1.6].(2) Longitudinal direction for sections and plates having width less than 600 mm.(3) One set of 3 Charpy V-notch impact specimens is required for each impact test.(4) Not required for sections and plates having width less than 600 mm.(5) Deformation 5% + 1 hour at 250°C.

NR 480, Sec 2


8 Rolled products made in stainlesssteel

8.1 Scope

8.1.1 This Article gives the approval test program for themanufacture of austenitic and austenitic-ferritic stainlesssteel products from AISI grades 304L, 304LN, 316L, 316LN,317L, 317LN and UNS grades 31803, 32550 and 32750used for the building of chemical tankers.


8.2.1 The following information is to be supplied by themanufacturer:

a) Type of products, (plates, sections, coils), steel grades,range of thickness and aim material properties as fol-lows:

• Range of chemical composition and aim analysesincluding residual elements if specific limits arespecified; if the range of chemical compositiondepends on thickness and supply condition, the dif-ferent ranges are to be specified, as appropriate,

• Maximum ferrite content for austenitic grades andferrite-austenite ratio for duplex grades,

• Production statistics of the chemical compositionand mechanical properties (ReH , Rm , A% and KV).

b) List of permitted cargoes and particular conditions fortransportation if any.

c) Steelmaking process

• Capacity of furnace(s),

• Raw material used,

• Deoxidation, refining and alloying practice,

• Laddle treatment (desulphurisation, vacuum degas-sing installations...).

d) Casting methods: ingot or continuous casting

In the case of continuous casting, information relevantto type of casting machine, teeming practice, methodsto prevent re-oxidation, inclusions and segregation con-trol is to be provided as appropriate;

• Ingot or slab size and weight,

• Ingot or slab treatment: scarfing and discarding pro-cedures.

e) Reheating and rolling

• Type of furnace and treatment parameters (reheatingtemperature, time...),

• Rolling: reduction ratio of slab/bloom/billet to fin-ished product thickness, rolling and finishing tem-peratures,

• Descaling treatment during rolling,

• Capacity of the rolling stands.

f) Heat treatment • Type of furnaces, heat treatment parameters and

their relevant records,• Accuracy and calibration of temperature control

devices.

g) Surface finishing: pickling or other methods.

h) Surface and internal conditions, specification or stan-dard used; repair procedure for surface defects if any.

i) Recommendations for working, welding and surfacecleaning:• Cold and hot working recommendations,• Minimum and maximum heat input, recommended

filler metals,• Cleaning, pickling and passivating recommenda-

tions (initial and in-service).

j) Where any part of the manufacturing process is assignedto other companies or other manufacturing plants, addi-tional information required by the Society is to beincluded.

k) For the approval of the semi-finished products such asslabs, blooms and billets, the above information a) to d)is to be given.


8.3.1 For each grade of steel and for each manufacturingprocess (e.g. steel making, casting, rolling and condition ofsupply), two products (one per cast) from two different castsrepresenting the average and the maximum thickness(dimension) to be approved are in general to be selected foreach kind of product. For grades 317L and 317LN, twoproducts from each cast are to be selected.


8.4.1 The extent of the test program is specified in [8.5] and[8.6]; it may be modified on the basis of the preliminaryinformation submitted by the manufacturer.In particular a reduction of the indicated number of casts,steel plate thicknesses and grades to be tested or completesuppression of the approval tests may be accepted by theSociety taking into account:





8.5 Tests on rolled products for austeniticgrades (304L, 316L, 316LN, 317L, 317LN)

8.5.1 The tests to be carried out are indicated inTab 5.

NR 480, Sec 2


Table 5 : Tests on rolled products for austenitic grades

8.6 Tests for austenitic-ferritic grades

8.6.1 Tests on rolled products

The tests to be carried out are indicated in Tab 6.

8.6.2 Weldability testsWeldability tests are required for plates and are to be car-ried out on samples of the thickest plate.

The following test assemblies are in general required:

a) 1 butt weld test assembly welded with a heat inputequal to the minimum heat input recommended by thesteelmaker

b) 1 butt weld test assembly welded with a heat inputequal to the maximum heat input recommended by thesteelmaker

The butt weld test assemblies are to be prepared with theweld seam transverse to the plate rolling direction, so thatimpact specimens will result in the longitudinal direction.





a) 1 cross weld tensile test,

b) Two sets of 3 Charpy V-notch impact specimens trans-verse to the weld with the notch located at the fusionline and at a distance 1, 3, 5, 7 and minimum 20 mmfrom the fusion line. The fusion boundary is to be identi-fied by etching the specimens with a suitable reagent.The test temperature is 0°C and −20°C. The minimumaverage impact energy shall exceed 27 J.

c) Hardness tests HV 5 across the weldment. The indenta-tions are to be made along a 1mm transverse linebeneath the plate surface on both the face side and theroot side of the weld as follows:• Weld metal, at each 2 mm,• Fusion line, • HAZ: at each 0,5 mm from fusion line into unaf-

fected base material.

d) Determination of ferrite content (aim at 30% - 60%) inbase metal heat affected zone and for information inweld metal.

Type of testPosition of the samples and direction

of the test specimens (1)Remarks

Tensile test Top and bottom - transverse (2) ReH , Rm , A5(%), RA(%) are to be reported

Tensile test at elevated temperature:50°C, 75°C and 100°C

Top and bottom - transverse (2) Rm and Rp 0,2 are to be reported

Impact tests Top and bottom -longitudinal and transverse

Testing temperature (°C):0°C and −196°C

Chemical composition From top tensile specimen Complete analysis including micro alloying elements and residual elements (C, Mn, Si, S, P, Cr, Ni, Mo, N, Cu, Sn, Sb, B, Ti, Nb, Va...)

Micro examination Top and bottom Surface and mid-thickness at magnification 100 and 500

Determination of ferrite delta content,Detection of detrimental phases (sigma)

Top and bottom

Liquid penetrant test Spot checks Both surfaces and edges to be checkedNo cracks allowed

Ultrasonic test All plates According to procedure submitted

Conventional accelerated corrosion tests (3) On each cast ASTM A262 Pr. E (4)ASTM A 262 Pr. C (5)

Special corrosion test in phosphoric media (6) On each cast Test type “weight loss”

Bend test (for information) Top - transverse Bend angle 180° on 3t

(1) For hot rolled strips see [1.6].(2) Longitudinal direction for sections and plates having width less than 600 mm.(3) These tests are strictly conventional and do not aim at providing guarantees on the effective resistance of the steel to the corro-

sion due to the chemicals carried, in the actual service conditions.(4) After sensitizing treatment 700°C during 30 minutes for stabilized and low carbon grades.(5) Not to be carried out on Mo alloyed grades.(6) To be agreed in case of particular cargoes.

NR 480, Sec 2


Table 6 : Tests on rolled products for austenitic-ferritic grades

9 Round bars for anchor chain cables

9.1 Scope

9.1.1 This Article gives the approval test program for themanufacture of round bars made of steel grade Q1, Q2 orQ3 used for the manufacture of anchor chain cables.


9.2.1 For each grade of steel and for each manufacturingprocess (e.g. steel making, casting, rolling and condition ofsupply), two products (one per cast) from two different castsrepresenting maximum diameter to be approved are in gen-eral to be selected for each kind of product.

The bars are to be heat treated in a way to simulate the heattreatment made during the manufacture of the anchor chaincable.



In particular a reduction or complete suppression of theapproval tests may be accepted by the Society taking intoaccount:



c) Approval of one yield strength level covers the approvalof the yield strength level immediately below, providedthe steelmaking process, deoxidation and fine grainpractice, casting method and condition of supply arethe same.


Where the number of tests differs from those shown in [9.4],the program is to be confirmed by the Society before thetests are carried out.

9.4 Tests on round bars



of the test specimens (1)Remarks

Tensile test Top and bottom - transverse (2) ReH , Rm , A5(%), RA(%) are to be reported

Tensile test at elevated temperature:50°C, 75°C and 100°C

Top and bottom - transverse (2) Rm and Rp 0,2 are to be reported

Impact tests Top and bottom -longitudinal and transverse

Testing temperature (°C):0°C, −20°C, −40°C, −60°C

Chemical composition From top tensile specimen Complete analysis including micro alloying elements and residual elements (C, Mn, Si, S, P, Cr, Ni, Mo, N, Cu, Sn, Sb, B, Ti, Nb, Va...)

Micro examination Top and bottom Surface and mid-thickness at magnification 100 and 500

Determination of ferrite/austenite ratio,Detection of detrimental phases (sigma)

Top and bottom

Liquid penetrant test Spot checks Both surfaces and edges to be checkedNo cracks allowed

Ultrasonic test All plates According to procedure submitted

Conventional accelerated corrosion tests (3) On each cast ASTM A 262 Pr. C

Special corrosion test in phosphoric media (4) On each cast Test type “weight loss”

Bend test (for information) Top - transverse Bend angle 180° on 3t

(1) For hot rolled strips see [1.6].(2) Longitudinal direction for sections and plates having width less than 600 mm.(3) These tests are strictly conventional and do not aim at providing guarantees on the effective resistance of the steel to the corro-

sion due to the chemicals carried, in the actual service conditions(4) To be agreed in case of particular cargoes

NR 480, Sec 2


Table 7 : Tests on round bars

10 Clad steel plates

10.1 Scope

10.1.1 This Article gives the approval test program for themanufacture of clad steel plates for ships.



a) Steel grade of base material and stainless steel grade ofcladding material;

b) Thickness range and tolerances on clad plate;

c) Details about manufacturing process, rolling or explo-sive bonding and associated inspection points and pro-cedures.


10.3.1 Two clad plates are to be selected from current pro-duction representing the average and the maximum thick-ness to be approved.


10.4.1 The extent of the test program is specified in [10.5];it may be modified on the basis of the preliminary informa-tion submitted by the manufacturer.


10.5 Tests on clad plate


Table 8 : Tests on clad plate


of the test specimensRemarks

Tensile test Longitudinal with axis at 1/3radius below the surface ReH , Rm , A5(%), RA(%) are to be reported

Impact tests

Steel grade Q1

Longitudinal with axis at 1/3radius below the surfaceTestingtemperature (°C):

+20 0

Steel grade Q2 +20 0 −20

Steel grade Q3 +20 0 −20


Sulphur prints Longitudinal mid-section

Micro examination Longitudinal section at 1/3 radius below the surface Magnification 100 and 500

Macroexamination Longitudinal mid-section



Chemical composition of base material and cladding material

From test specimen Complete analysis including micro alloying ele-ments

Tensile test Full clad plate As per NR216 Materials and Welding, Ch 2, Sec 1 for clad plates

Impact tests on base material Longitudinal and transverse Testing temperature (°C) at T°C (test temperature specified for base material) and at (T − 20)°C

Bend tests Full clad plate, one from each end of the clad plate

As per NR216 Materials and Welding, Ch 2, Sec 1 for clad plates

Shear test As per NR216 Materials and Welding, Ch 2, Sec 1 for clad plates

Micro examination Showing bonded area and surfaces of base material and cladding material

Magnification 100

Ultrasonic testing As per NR216 Materials and Welding, Ch 2, Sec 1 for clad plates

NR 480, Sec 2


11 Plates with specified throughthickness properties

11.1 Scope

11.1.1 This Article gives the approval test program for themanufacture of plates with specified through thicknessproperties.


11.2.1 In addition to the information mentioned in [1.2],the following information is to be supplied:

a) Maximum thickness and steel grades with delivery con-ditions for which approval is requested;

b) Details about process modifications to obtain the prop-erties (inclusion shape control, low sulphur...);

c) Ultrasonic examination procedures and acceptance cri-teria.


11.3.1 One plate representative of maximum thickness tobe approved is to be selected.


11.4.1 The extent of the test program is specified in [11.5];it may be modified on the basis of the preliminary informa-tion submitted by the manufacturer.


11.5 Tests on plates


Table 9 : Tests on plates



Chemical composition From test specimen Complete analysis including micro alloying elements

Through thickness tensile test • Top and axis of the plate, 3 specimens• Top and mid-way between axis and edge of the

plate, 3 specimens• Bottom and axis of the plate, 3 specimens• Bottom and mid-way between axis and edge of the

plate, 3 specimens

Ultrasonic testing As per NR216 Materials and Welding, Ch 2, Sec 1, [9.10]

NR 480, Sec 3


SECTION 3 SEAMLESS PIPES AND FITTINGS

1 Seamless pipes and fittings

1.1 Scope

1.1.1 This section gives the scheme for the approval of themanufacturing process of seamless pipes and fittings madeof low alloy and alloy steel grades intended for high tem-perature use.

A similar scheme may be used for approval of manufactur-ing process of seamless pipes and fittings for other applica-tions upon special consideration by the Society.



a) Base material type and manufacturer’s name,

b) Steel grades, range of dimensions (wall thickness, diam-eter, length),

c) Description of the manufacturing process,

d) Detail about heat treatment,

e) Quality controls from raw materials to finished prod-ucts,

f) If a non destructive test of the whole pipe is proposed bythe manufacturer as an alternative to the hydraulic pres-sure test, the relevant procedure is to be supplied and isto contain details on the following:

• Method, type of equipment and capacity (pipe wallthickness and outside diameter range);

• Calibration criteria, dimension and position of artifi-cial defects;

• Frequency of calibration;

• Length of untested ends, if applicable;

• Sensitivity to detect internal, external defects;

• Acceptance, rejection criteria;

• Operators qualification according to internationalstandard.

1.3 Documents to be submitted for chang-ing the approval conditions

1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request ofchanging the approval conditions, in the case of change ofthe approval conditions (dimension range, steel grades...).


1.4 Approval survey




1.5.1 The test samples are to be taken in accordance withNR216 Materials and Welding, Ch 2, Sec 2.


1.6.1 The test specimens and testing procedures are to be,as a rule, in accordance with NR216 Materials and Weld-ing, Ch 1, Sec 2.


1.7.1 For each grade of steel and for each condition of sup-ply, two test products originating from different heats andrepresenting the average and the maximum dimensions tobe approved are in general to be selected.



In particular a reduction of the indicated number of prod-ucts and grades to be tested or complete suppression of theapproval tests may be accepted by the Society taking intoaccount:



NR 480, Sec 3


c) Approval for any grade of steel also covers approval forany lower grade in the same strength level, providedthat the method of manufacture and condition of supplyare similar.

d) Approval for a strength level may cover approval forlower strength levels provided that the type of steel andthe conditions of supply are the same.


1.9 Approval tests


Table 1 : Tests

Type of testPosition of the

samples and direction of the test specimens

Remarks

For each product, all the relevant tests required in NR216 Materials and Welding, Ch 2, Sec 2 are to be performed in addition to the following tests

Chemicalcomposition

From product sample Complete analysis

Microexamina-tion

Magnification 100

Sulphur print Cross sectional area

Dimensional examination

NR 480, Sec 4


SECTION 4 WELDED PIPES AND FITTINGS

1 Welded pipes and fittings

1.1 Scope

1.1.1 This section gives the scheme for the approval of themanufacturing process of pipes and fittings welded by elec-tric resistance, induction or electric arc processes giving anefficiency of the weld joint equal to 1.



a) Base material type and manufacturer’s name

b) Steel grades, range of dimensions (wall thickness, diam-eter, length)

c) Description of the manufacturing process

d) Weld joint type, welding procedure specification andsupporting welding procedure approval report, weldingequipment

e) Detail about heat treatment

f) Quality controls from raw materials to finished products

g) Procedures for non destructive examination of the weldjoint which is to contain details as described in h) here-after

h) If a non destructive test of the whole pipe is proposed bythe manufacturer as an alternative to the hydraulic pres-sure test, the relevant procedure is to be supplied and isto contain details on the following:

• Method, type of equipment and capacity (pipe wallthickness and outside diameter range)

• Calibration criteria, dimension and position of artifi-cial defects

• Frequency of calibration

• Length of untested ends, if applicable

• Sensitivity to detect internal, external defects

• Acceptance, rejection criteria

• Operators qualification according to internationalstandard.


1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request of

changing the approval conditions, in the case of change ofthe approval conditions (dimension range, steel grades...).


1.4 Approval survey




1.5.1 The test samples are to be taken in accordance withNR216 Materials and Welding, Ch 2, Sec 2.


1.6.1 The test specimens and testing procedures are to be,as a rule, in accordance with NR216 Materials and Weld-ing, Ch 1, Sec 2.


1.7.1 For each grade of steel, each manufacturing processand each condition of supply, two test products originatingfrom different heats and representing the average and themaximum dimensions to be approved are in general to beselected.



In particular a reduction of the indicated number of prod-ucts and grades to be tested or complete suppression of theapproval tests may be accepted by the Society taking intoaccount:



NR 480, Sec 4


c) Approval for any grade of steel also covers approval forany lower grade in the same strength level, providedthat the method of manufacture and condition of supplyare similar.

d) Approval for a strength level may cover approval forlower strength levels provided that the type of steel andthe conditions of supply are the same.


1.9 Approval tests


Table 1 : Tests on base material




Chemical composition From product sample Complete analysis

Microexamination and hardness Including weld metal, fusion line and heat affected zone

Magnification 100; Hardness HV5 Vickers on weld metal, heat affected zone and base metal to be recorded

Macroexamination Transverse to the weld

Sulphur print Cross sectional area

Dimensional examination

Checking of ferrite content Base material, heat affected zone and weld metal Applicable only to duplex stainless steel grades

NR 480, Sec 5


SECTION 5 STEEL FORGINGS

1 Steel forgings

1.1 Scope

1.1.1 This section gives the scheme for the approval of themanufacturing process of steel forgings.

1.2 Specific information to be submitted forapproval

1.2.1 The following specific information and relevant doc-umentation are to be submitted together with the request forapproval and in addition to general information as detailedin Sec 1, [1.3]:

a) Production method of original steel (steelmaking, vac-uum degassing, casting, ingot weights and size...)

b) Description of forging facilities (presses, hammers, heattreating furnaces...)

c) Description of forging process with sketches showingforming of forging from the ingot stage and relevantreduction ratio

d) Description of special processes adopted for grain flowforged products and for forgings with weld joints

e) Production capacity, dimensions of products and weigthrange

f) Materials specifications for materials not included in theRules or not covered by international standards

g) Laboratory facilities and equipment for inspection andtesting

h) Quality control documentation; description including aprocess flow chart with details about inspection pointsand a list of applicable instructions

i) List of personnel in charge of the non-destructive testingand their qualification

j) Heat treatment procedures (heating and cooling rate,holding time)

k) Alternative procedure to conventional heat treatment, ascontrolled cooling from finishing forging temperature.


1.3.1 The approval may be requested for the following typeof steel:

• Carbon steels

• Carbon-manganese steels

• Low-alloy steels

• Alloy steels

• Stainless steels.

When the approval is applied for one type of steel, two forg-ings, from two different casts, representative of the range offorgings to be approved are to be tested. When the approvalis applied for carbon, carbon-manganese, low-alloy andalloy steels, it may be reduced to one cast only per eachtype of steel.

In general, the following tests are to be performed on eachforging (for special grades, case by case approval test pro-gram is to be considered):

a) Laddle and product chemical analysis. Material forproduct analysis should be taken from the tensile speci-men;

b) Mechanical tests:

• Tensile test(s)

• Hardness tests where required by the Rules

• Charpy V-notch impact tests at +20°C and 0°C (or+20°C and relevant temperature for low temperaturegrades as per Rules requirements), one set of threespecimens for each temperature

c) Microstructure examination

d) Macro examination for grain flow forged products

e) Sulphur print.

The test samples and the test specimens are to be taken inaccordance with NR216 Materials and Welding, Ch 2, Sec 3for the type of forging involved.

NR 480, Sec 6


SECTION 6 STEEL CASTINGS

1 Steel castings

1.1 Scope

1.1.1 This section gives the scheme for the approval of themanufacturing process of steel castings.

1.2 Specific information to be submitted forapproval

1.2.1 The following specific information and relevant doc-umentation are to be submitted together with the request forapproval and in addition to general information as detailedin Sec 1, [1.3]:

a) Production method of original steel (steelmaking, vac-uum degassing,...)

b) Description of casting facilities (Melting furnaces,mould making...)

c) Production capacity, dimensions of products and weigthrange

d) Materials specifications for materials not included in theRules or not covered by international standards

e) Laboratory facilities and equipment for inspection andtesting

f) Quality control documentation; description including aprocess flow chart with details about inspection pointsand a list of applicable instructions

g) List of personnel in charge of the non-destructive testingand their qualification

h) Heat treatment procedures (heating and cooling rate,holding time).


1.3.1 The approval may be requested for the followingtypes of steel:• Carbon steels• Carbon-manganese steels• Low-alloy steels• Alloy steels• Stainless steels.

When the approval is applied for one type of steel, two cast-ings, from two different casts, representative of the range ofcastings to be approved are to be tested. When the approvalis applied for carbon, carbon-manganese, low-alloy andalloy steels, it may be reduced to one cast only per eachtype of steel.

In general, the following tests are to be performed on eachcasting (for special grades, case by case approval test pro-gram is to be considered):

a) Laddle and product chemical analysis. Material forproduct analysis should be taken from the tensile speci-men

b) Mechanical tests: • Tensile test(s)• Hardness tests• Charpy V-notch impact tests at +20°C and 0°C (or

+20°C and relevant temperature for low temperaturegrades as per Rules requirements), one set of threespecimens for each temperature

c) Microstructure examination.The test samples and the test specimens are to be taken inaccordance with NR216 Materials and Welding, Ch 2, Sec 4for the type of casting involved.

NR 480, Sec 7


SECTION 7 WROUGHT ALUMINIUM ALLOY PRODUCTS

1 Wrought aluminium alloy products

1.1 Scope

1.1.1 This Section gives the scheme for the approval of themanufacturing process of wrought aluminium alloy prod-ucts for ships.



a) Type of products (rolled, extruded), grades of aluminiumalloy, conditions of supply, range of dimension and aimmaterial properties as follows:

• Range of chemical composition and aim analysesincluding maximum impurities content; if the rangeof chemical composition depends on thickness andsupply condition, the different ranges are to be spec-ified, as appropriate

• Production statistics of the chemical compositionand mechanical properties (ReH, Rm, A%)

b) For alloys not already covered by international stan-dards including marine applications, the registration sta-tus for marine use to The Aluminium Association is tobe supplied to the Society for information; In that casethe manufacturer is to supply also information about thedesign, development and qualification stages of suchalloy (modification of existing alloy, new alloy...)

c) Description of alloy making and semi-finished productsmaking process

d) Use of semi-finished products manufactured by otherplants or companies

e) Description of rolling or extruding process

f) Heat treatment:

• Type of furnaces, heat treatment parameters andtheir relevant records

• Accuracy and calibration of temperature controldevices

g) Information about welding; recommended filler metals,as welded properties, ...

h) Recommendations for working

i) Where any part of the manufacturing process is assignedto other companies or other manufacturing plants, addi-tional information required by the Society is to beincluded.


1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request ofchanging the approval conditions, in the case of the follow-ing a) through e):

a) Change of the manufacturing process (alloy making,casting, rolling and heat treatment)

b) Change of the range of approval

c) Change of the chemical composition, added element,etc.

d) Subcontracting the rolling, heat treatment, etc.

e) Use of semi-finished products manufactured by othercompanies which are not approved.


1.4 Approval survey

1.4.1 The approval tests are to be witnessed by the Sur-veyor at the manufacturer’s plant and the execution of theplant inspection in operation may be required by the Sur-veyor during the visit for the approval. If the testing facilities are not available at the works, thetests are to be carried out at recognised laboratories.


1.5.1 The position of the samples are to be in accordancewith NR216 Materials and Welding, Ch 3, Sec 2.


1.6.1 The test specimens and testing procedures are to be,as a rule, in accordance with NR216 Materials and Weld-ing, Ch 1, Sec 2.The test results are to be in accordance, where applicable,with the requirements specified for the different alloys inNR216 Materials and Welding, Ch 3, Sec 2.


1.7.1 For each grade of aluminium alloy, condition of sup-ply and for each manufacturing process (rolling, extrudingand condition of supply), two test products originating fromtwo different heats and representing the average and themaximum thickness (dimension) to be approved are in gen-eral to be selected for each kind of product.

NR 480, Sec 7




In particular a reduction of the indicated number of heats,dimensions and grades to be tested may be accepted by theSociety taking into account:


b) Grades of aluminium alloys to be approved and avail-ability of long term statistic results of chemical andmechanical properties.

When long term statistic results are available for followingalloys, approval tests may be reduced to routine tests as perNR216 Materials and Welding, Ch 3, Sec 2:

• Series 5000 alloys:

5083 - 5086 - 5052 - 5154A - 5454 - 5754 in temperstate 0 - H111 - H112 - H116 - H321 - H32 - H22 - H34- H24 - H36 - H26

• Series 6000 alloys:

6005A - 6106 - 6061 - 6082 - 6060 in temper state T4 -T5 - T6.

On the other hand, an increase of the number of heats andthicknesses to be tested may be required in the case ofnewly developed types of aluminium alloys or manufactur-ing processes.


1.9 Tests on base material



1.10.1 GeneralWeldability tests are required for plates and are to be car-ried out on samples of plate (average and maximum thick-ness) for alloys newly developed or newly manufactured.

1.10.2 Preparation and welding of the test assembliesOne butt weld is to be prepared for each thickness tested.

The welding procedure should be as far as possible inaccordance with the normal welding practice used at theyards for the type of aluminium alloy in question.

The welding parameters including consumables designationand diameter, heat input, number of passes, etc. are to bereported.

1.10.3 Type of tests

The relevant tests required in NR216 Materials and Weld-ing, Ch 5, Sec 4, [6] are to be performed with the followingtests in addition:• Corrosion tests on as welded samples and welded sam-

ples artificially aged at 100°C during 7 days: ASTM G66(ASSET test) and ASTM G67 (NAMLT test)These tests are to be repeated with the surface of thesamples slightly machined (about 10% of original thick-ness material removed)

• Stress corrosion tests in marine atmosphere such asbending tests with a yield stress on the tension side upto 90% of heat affected zone yield strength performedon as welded samples and welded samples artificiallyaged at 100°C during 7 daysThese tests are to be repeated with the surface of thesamples slightly machined (about 10% of original thick-ness material removed).

1.10.4 Other tests

Additional tests such as fatigue tests may be required in thecase of newly developed type of aluminium alloys outsidethe scope of the NR216 Materials and Welding, or whendeemed necessary by the Society.

Table 1 : Tests on base material

Type of testPosition of the samples and

direction of the test specimensRemarks

For each product, all the relevant tests required in NR216 Materials and Welding, Ch 3, Sec 2 are to be performed in addition to the follow-ing tests

Chemical composition Product sample Added elementsResidual elements such as hydrogen (H), sodium (Na), tin (Sn), lead (Pb) and bismuth (Bi)

Tensile test Top and bottom ReH, Rm , A5(%) are to be reported

Bend tests for rolled products Top and bottom 180° bending, mandrel diameter agreed on case by case basis

Macro examination for extruded products

Cross section To check coarse grain size (ASTM E 112-88 growth index O) and extent of peripheric coarse grain areas (depth is not to exceed one third of product thickness)

Corrosion tests on base material (1) Each product ASTM G66 (ASSET test) and ASTM G67 (NAMLT test)Corrosion tests on base material in artificially aged condition (1)

Each product Artificially aged at 100°C during seven daysASTM G66 (ASSET test) and ASTM G67 (NAMLT test)

(1) For series 5000 alloys newly developed or newly manufactured

NR 480, Sec 8


SECTION 8 EXPLOSION BONDED ALUMINIUM/STEEL

TRANSITION JOINTS

1 Explosion bonded aluminium/steeltransition joints

1.1 Scope

1.1.1 This Section gives the scheme for the approval of themanufacturing process of explosion bonded alumin-ium/steel transition joints for ships.



a) Manufacturer’s specification which is to contain follow-ing information:

• Aluminium grades and steel grades used for themanufacture of the joints

• Dimensions of the joints and thickness of the variouslayers

• Guaranteed mechanical properties of the joints

b) Description of the manufacturing process includinginspection points

c) Non destructive tests procedures

d) Recommendations for fitting, welding, cutting...

Where any part of the manufacturing process is assigned toother companies or other manufacturing plants, additionalinformation required by the Society is to be included.

1.3 Documents to be submitted for changingthe approval conditions

1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request ofchanging the approval conditions, in case of the following:

a) Change of the manufacturing process

b) Change of the range of approval (thickness, materialgrades...).


1.4 Approval survey




1.5.1 For each type of joint to be approved, enough mate-rial is to be selected from current production to perform theapproval tests.


1.6.1 The extent of the test program is specified in [1.7]; itmay be modified on the basis of the preliminary informationsubmitted by the manufacturer. In particular a reduction ofthe approval test program may be accepted by the Societytaking into account:

a) Approval already granted by other Classification Societ-ies and documentation of approval tests performed

b) Type of joints to be approved and availability of statisticresults of mechanical properties.

On the other hand, an increase of the number of tests maybe required in the case of newly developed type of joints.


1.7 Approval tests


1.8 Other tests

1.8.1 Additional tests such as corrosion tests may berequired in the case of newly developed type of joints, orwhen deemed necessary by the Society.

NR 480, Sec 8


Table 1 : Approval Tests




Through thickness tensile test One sample After heating to 320°C during 15 minutes

Bend test Two samples 180° bending, mandrel diameter agreed on a case by case basisAs bonded and after heating to 320°C during 15 minutes

Through thickness tensile tests on welded assembly

To be agreed a on case by case basis

Axial fatigue tension to compression tests

To be agreed on case by case basis

NR 480, Sec 9


SECTION 9 ANCHOR CHAIN CABLES AND ACCESSORIES

FOR SHIPS

1 Anchor chain cables and accessoriesfor ships

1.1 Scope

1.1.1 This Section gives the scheme for the approval of themanufacturing process of flash butt-welded or cast anchorchain cables for ships and associated cast or forged acces-sories (end link, enlarged link, anchor shackle, joiningshackle, Kenter shackle and swivel).

The approval scheme for other manufacturing process issubjected to case by case consideration.


1.2.1 Flash butt-welded chain cablesThe following information is to be supplied by the manufac-turer:

a) Steelgrade specification for round bars and name &address of suppliers

b) Size range to be approved and drawing of commonchain link (including stud details for studlink chains)

c) Description of the manufacturing process with detailsabout:

• Welding machines

• Heat treatment furnaces, type, equipment for tem-perature monitoring and its calibration

d) Description of quality control during production fromraw materials to finished products with inspectionpoints

e) Procedures or instructions for:

• Heat treatment and associated control

• Non destructive tests of weld joint and finished links

• Type, extent and criteria

• Non destructive tests of stud weld, as applicable.


1.2.2 Cast chain cablesThe following information is to be supplied by the manufac-turer:

a) Steel grade specification, size range and drawing ofcommon chain link

b) Description of steelmaking and casting process

c) Heat treatment furnaces, type, equipment for tempera-ture monitoring and its calibration

d) Description of quality control during production withinspection points



• Non destructive tests of finished links

• Type, extent and acceptance criteria.


1.2.3 Forged accessories

The following information is to be supplied by the manufac-turer:

a) Steel grade specification, size range and drawing ofeach type of accessory

b) Raw materials (ingots, round bars...) suppliers name &address

c) Description of forging process

d) Heat treatment furnaces, type, equipment for tempera-ture monitoring and its calibration

e) Description of quality control during production fromraw materials to finished products with inspectionpoints

f) Procedures or instructions for:


• Non destructive tests of finished products

• Type, extent and acceptance criteria.


1.2.4 Cast accessories

The following information is to be supplied by the manufac-turer:

a) Steel grade specification, size range and drawing ofeach accessory

b) Description of steelmaking and casting process

c) Heat treatment furnaces, type, equipment for tempera-ture monitoring and its calibration

d) Description of quality control during production



• Non destructive tests of finished products

• Type, extent and criteria.

NR 480, Sec 9




1.3.1 The manufacturer has to submit to the Society thedocuments required in [1.2] together with the request ofchanging the approval conditions, in case of the following:

a) Change of the manufacturing process

b) Change of the range of approval (maximum diameter,steel grade...).


1.4 Approval survey




1.5.1 Flash butt welded chain cableOne chain length with suitable number of links for theapproval tests is to be selected as follows:

• Maximum diameter to be approved

• The length is to be heat treated using current productionequipment and procedures.

1.5.2 Cast chain cableOne chain length with suitable number of links for approvaltests is to be selected as follows:


• The length is to be heat treated using current productionequipment and procedures.

1.5.3 Forged or cast accessoriesSuitable quantity of each type of accessories is to beselected as follows:


• The items are to be heat treated using current produc-tion equipment and procedures.


1.6.1 The extent of the test program is specified in [1.7]; itmay be modified on the basis of the preliminary informationsubmitted by the manufacturer. In particular a reduction ofthe approval test program may be accepted by the Societytaking into account approval already granted by other Clas-sification Societies and documentation of approval testsperformed.


1.6.2 Flash butt welded chain cableEach grade and type of chain is to be tested.

Approval for studlink chain cable of any grade may coverapproval for studless chain cable of same diameter providedthat the method of manufacture and condition of supply aresimilar.

Approval for common links may cover approval forenlarged link and end link up to tested diameter providedthat the method of manufacture and condition of supply aresimilar.

1.6.3 Cast chain cableEach grade and type of chain is to be tested.

Approval for studlink chain cable of any grade may coverapproval for studless chain cable of same diameter providedthat the method of manufacture and condition of supply aresimilar.

Approval for common links may cover approval forenlarged link and end link up to tested diameter providedthat the method of manufacture and condition of supply aresimilar.

1.6.4 Forged or cast accessoriesEach type of manufacturing process is to tested.

For a type of accessory, approval for any grade of steel maycover approval for lower strength grades provided that thesteel type, method of manufacture and condition of supplyare similar.

Each type of accessory is to be tested. However approval foranchor shackle may cover approval for joining shackle upto the same diameter provided that the method of manufac-ture and condition of supply are the same.

1.7 Approval tests and documentation

1.7.1 Approval tests for flash butt welded chaincables

In addition to test reports, documentation relative to themanufacturing process parameters of the length tested is tobe supplied and is to include:

• Heating and hot bending of round bars

• Welding parameters

• Stud insertion and all information about stud welding,as applicable

• Heat treatment.


1.7.2 Approval tests for cast chain cables


1.7.3 Approval tests for cast or forged accessories


NR 480, Sec 9


Table 1 : Approval tests for butt welded chain cables

Table 2 : Approval tests for cast chain cable

Table 3 : Approval tests for cast or forged accessories



All the relevant routine tests required in NR216 Materials and Welding, Ch 4, Sec 1 for chain length (proof test, break tests,...) and for links (mechanical properties) are to be performed in addition to the following tests

Chemical analysis From tensile test specimen Complete analysis (C, Mn, Si, S, P, N, Cu, Cr, Ni, Mo, Al, Ti, Nb, V, Sn, As, Sb...)

Tensile test One specimen clear of the weldOne specimen across the weldBoth taken at 1/3 radius below surface

Impact tests One set from side opposite to the weldOne set from bent areaOne set with notch in the weldOne set with notch in HAZ

At +20°C and 0°C for grade Q1At +20°C, 0°C and −20°C for grades Q2 and Q3

Bend tests Two links Full link to be tested at bending angle 180° (weld seam in the middle of bent area)Alternative cross weld bend tests at 180° on 4t mandrel may be agreed.

Macro examination andhardness tests

Longitudinal section showing the weld Hardness tests from base metal to weld metal for quenched and tempered grades

Micro examination Weld metalHeat affected zoneBent area of common link

Magnification 100 and 500





Tensile test At 1/3 radius below surface

Impact tests At 1/3 radius below surface At +20°C and 0°C for grade Q1At +20°C, 0°C and −20°C for grades Q2 and Q3

Macro examination Longitudinal section Hardness tests from base metal to weld metal for quenched and tempered grades

Micro examination At 1/3 radius below surface Magnification 100 and 500





Tensile test At 1/3 radius below surface On each item of the accessory

Impact tests At 1/3 radius below surface On each item of the accessoryAt +20°C and 0°C for grade Q1At +20°C, 0°C and −20°C for grades Q2 and Q3

Macro examination Longitudinal section

Micro examination At 1/3 radius below surface Magnification 100 and 500