et 45 micro
TRANSCRIPT
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Centralloy
ET 45 MicroMATERIAL DATA SHEET
Designation: GX45NiCrSiNb45-35
Data Sheet for information only September 2009, Rev. 02 Copyright Schmidt + Clemens GmbH + Co. KGSchmidt + Clemens GmbH + Co. KG Edelstahlwerk Kaiserau P.O. Box 1140 51779 Lindlar, Germany
Schmidt + Clemens Group
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Centralloy ET 45 Micro GX45NiCrSiNb45-352
Centralloy ET 45 Micro
Features
Centralloy ET 45 Micro is an air melted nickel-base alloy con-sisting essentially of a Ni-Cr-Fe-Si matrix. The high chromiumlevel, rare earth additions and primary carbide formation providethe best compromise between good high temperature corrosionresistance and high temperature creep rupture strength.
The presence of carbon leads to the formation of a series ofcarbides:
a) Intergranularly occuring primary carbides, nitrides or car-bonitrides of general form M(C,N) where M is usually niobium,titanium and zirconium. These greatly affect the generationof good high temperature properties. The phase is visible inunetched micro specimens, its color varying from the orange/ yellow of the nitride to the grey/mauve of the carbide.
b) Chromium-rich intergranular carbides of the M7C3 and M23C6 types. These carbides have a profound influence on propertiesdue to the decomposition and re-precipitation reactions inservice producing secondary carbides in a rather uniform dis-persion. By this mechanism dislocation movement is impededwith the result of significant strengthening at elevated tem-peratures.
Product Forms
Centralloy ET 45 Micro was designed as centrispun tube mate-
rial to meet specific design criteria in terms of carburisation andoxidation resistance, creep rupture strength and weldability. It isavailable as centrispun tubes, vertically spun, statically cast andinvestment cast product forms.
Other forms may be supplied upon request. Further informationregarding these topics and maximum und minimum sizes, maybe obtained from the sales department.
Chemical Composition (*)
mass percentage
Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45Silicon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.60Manganese . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00Chromium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.00Iron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16.00Niobium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00Titanium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AdditionsZ i r c o n i u m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A d d i t i o n sRare earth elements . . . . . . . . . . . . . . . . . . . . . . . . AdditionsNickel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Balance
(*) This is a typical composition which may be slightly modifiedaccording to the application.
Applications
Tubular systems requiring superior carburisation and oxidationresistance combined with high creep rupture strength and highcreep resistance. No heat treatment is required for most appli-cations of this alloy. Main high temperature applications for thematerial are:
Process: max. operating temperature, C
Steam cracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1150Direct reduction of iron ore . . . . . . . . . . . . . . . . . . . . . . 1150
Contents:
Features, Product Forms,
Chemical Composition, Appli ca tions . . . . . . . . . . . . . . . . 2
Physical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mechanical Properties . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ca rbur isa tion, Oxida tion Resistance . . . . . . . . . . . . . . . . 5
Parametric Stress Rupture Strength . . . . . . . . . . . . . . . . 6
Parametric Minimum Creep Rate,Manufacturing Characteristics,Health and Safety Information . . . . . . . . . . . . . . . . . . . . 7
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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3GX45NiCrSiNb45-35Centralloy ET 45 Micro
Physical Properties
Density: 8.1 g/cm3
Thermal Conductivity (20C): 14.0 W/mK
18.5
0 200 400 600 800 1000 1200
17.0
15.5
14.5
17.5
16.5
16.0
15.0
18.0
Mean Coefficient of Linear Thermal Expansion
Temperature, C
C o e
f f i c i e n t o
f T h e r m a l E x p a n s i o n
, 1 0 - 6 / K
160
0 200 400 600 800 1000 1200
140
110
90
150
130
120
100
Youngs Modulus of Elasticity
Temperature, C
Y o u n g s M o d u l u s , G P a
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Centralloy ET 45 Micro GX45NiCrSiNb45-354
350
250
100
300
200
150
50
700 750 800 850 900 950 10000
50
700 750 800 850 900 950 1000
40
10
0
30
20
Mechanical Properties (only for wall thickness less than 25 mm in the as cast condition)
Tensile propertiesMinimum tensile properties at 20C: 0.2% Yield strength: 245 MPa Ultimate tensile strength: 450 MPa Elongation (l = 5d): 6% for centricast tubes
3% for static castings
Typical Tensile Strength and 0.2% Yield Strength vs. Temperature
Typical Tensile Test Elongation vs. Temperature
Temperature, C
Temperature, C
S t r e n g t h
, M P a
E l o n g a t i o n ( l =
5 d ) , %
Centralloy ET 45 Micro
Ultimate Tensile Strength0.2% Yield Strength
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5GX45NiCrSiNb45-35Centralloy ET 45 Micro
2.0
1025 1050 1075 1100 1125 1150 1175
1.5
0.5
0
1.0
0.01025 1050 1075 1100 1125 1150 1175
0.5
1.0
1.5
2.0
01025 1050 1075 1100 1125 1200
15
1000
10
5
1150 1175
20
25
Increase in Carbon Content vs. Temperature after Pack Carburisationfor 260 Hours at Indicated Test Temperature
Oxidation Weight Loss vs. Temperature for 10 Thermal Cycles in AirBetween Indicated Temperature and Room Temperature
Temperature, C
Temperature, C
C a r b o n
i n c r e a s e
, %
W e i g h t L o s s
, m g
/ c m 2
7 hours hold time per cycle at test temperature
Carburisation Resistance
Oxidation Resistance
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7GX45NiCrSiNb45-35Centralloy ET 45 Micro
Parametric Minimum Creep Rate
Manufacturing Characteristics Health and Safety Information
MachiningIn general terms the machinability of Centralloy ET 45 Micro issimilar to that of other heat resistant alloys.
WeldingFor critical, highly stressed and corrosion resistant joints coatedelectrodes, flux cored wire and bare filler material are com-mercially available. These welding consumables have highstrength properties at elevated temperatures with good retainedductilities. Besides fillerless PAW, TIG and MAW have been usedsatisfactorily for component fabrication or repair welding. Pre-heating and postweld heat treatment of the jo int is not necessary.For dissimilar weld joints to austenitic materials the same fillermaterials are recommended. Further information will be suppliedupon request.
The operation and maintenance of welding equipment shouldconform to the provisions of relevant national standards for theprotection of personnel.
Mechanical ventilation is advisable, and under certain conditionsin confined spaces, is necessary during welding operations inorder to prevent possible exposure to hazardous fumes, gases,or dust that may occur.
Nickel- and iron-base materials may contain, in varying concen-trations, elemental constitutions of chromium, iron, manganese,molybdenum, cobalt, nickel, tungsten and aluminium. Inhalationof metal dust from welding, grinding, melting and dross handlingof these alloy systems may cause adverse health effects.
10.0 12.5 15.0 17.5 20.0 27.5
31
7.5
30
29
22.5 25.0
32
33
30.0 32.5 35.027
28
Initial Stress, MPa
P =
( T + 2 7 3 ) ( 2 0 - l
o g [ m
i n .
c r e e p r a t e
i n %
p e r h o u r ] ) / 1 0 0 0
The information in this publication is as complete and accurate as possible at the time of publication. Variations in properties can occur to production and process routes.However, no warranty or any legal liability for its accuracy, completeness and results to be obtained for any particular use of the information herein contained is given. Wherepossible the test conditions are fully described. Where reference, is made to the balance of the alloys composition it is not guaranteed that this balance is composed exclu-sively of the element mentioned, but that it predominates and others are present only in minimal quantities. The creep rupture data are frequently insufficient to be directlytranslatable to specific design or performance applications without examination and verification of their applicability and suitability by professionally qualified personnel. Theprimary units for property data are based on those of the SI-system.
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