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CORPORATE PURCHASING SPECIFICATIONAA 113 16

Rev. No. 01

PREFACE SHEET

INOCULANTS FOR CAST IRONS

FOR INTERNAL USE ONLYREMOVE THIS PREFACE BEFORE ISSUE TO SUPPLIERS

Comparable Standards:

Suggested / Probable Suppliers and Grades :

1. M/S Greaves Foseco Limited, Pune2. Plant vendors list

User Plant References: 1. BHOPAL : -- 2. HYDERABAD : --

Revisions :

Cl 18.6.14 of MOM of MRC-FN

APPROVED :INTERPLANT MATERIAL

RATIONALISATION COMMITTEE-MRC (FN)

Rev. No.01 Amd.No. Reaffirmed

Dt:15.01.2004 Dt : Year :Prepared

HYDRABADIssued

Corp. R&DDt. of 1st Issue

MAY, 1994

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.CORPORATE PURCHASING SPECIFICATION

AA 113 16

Rev. No. 01

PAGE 1 OF 2

INOCULANTS FOR CAST IRONS

1.0 GENERAL:This specification governs the quality requirements of inoculants used in foundriesfor inoculating liquid melts of flake graphite iron castings. Inoculating agents shallbe based on ferro-silicon, calcium silicate, graphite or suitable blend of these agentsalong with other elements like barium.

2.0 APPLICATION:The flake graphite iron castings are inoculated to facilitate achieving the followingobjectives:

a) Promote type A graphite

b) Prevent formation of carbides in the matrix in thin section also.

c) Improvement in the tensile strength of the base iron.

d) Increase in number of eutectic cells.

e) Good solubility even at low pouring temperatures.

f) Reduce fading of inoculants.

3.0 COMPLIANCE WITH NATIONAL STANDARDS:There is no national standard covering this type of material.

4.0 GRADE OF METAL:To be suitable for treatment of cast iron grades FG 200, FG 220, FG 260 andFG 300 as per IS:210 and their equivalent grades.

5.0 SHAPE AND SIZE:The inoculants shall be in the form of granules of size 1 to 3 mm with percentage ofundersize and oversize materials restricted to 10% maximum.

6.0 PROPERTIES: 6.1 Carbon Equivalent:

Suitable for treatment of irons with carbon equivalents in the range from 3.4 to 4.2.

6.2 Rate of addition: 0.1 to 0.3% of liquid metal by weight

6.3 Temperature of Treatment:

To be suitable of treatment of melts at temperature 13700C and above.

6.4 Fading Time: To be effective for a minimum period of 15 minutes.

Revisions :

Cl 18.6.14 of MOM of MRC-FN

APPROVED :INTERPLANT MATERIAL

RATIONALISATION COMMITTEE-MRC (FN)

Rev. No. 01 Amd.No. Reaffirmed

Dt:15.01.2004 Dt : Year :Prepared

HYDRABADIssued

Corp. R&DDt. of 1st Issue

MAY, 1994

CORPORATE PURCHASING SPECIFICATION

6.5 Mechanical Properties:

Liquid grey iron shall be inoculated with the inoculant at a temperature of 1400 ±200C. 30 mm dia test bars as per IS:210 will be cast and when tested for tensilestrength shall show a value of 260 N/mm2, minimum.

7.0 INSPECTION DEVIATION AND REPLACEMENT:

BHEL reverses the right to inspect the material at site before despatch. The supplier shall intimate in advance enclosing a copy of the test certificate of the material offered for inspection. Final tests shall be carried out at BHEL and material will be accepted or rejected on this result. If the material received is not found suitable to our requirements, it shall be replaced free of charge by the supplier.

8.0 TEST CERTIFICATES:

Unless otherwise specified, Three copies of test certificates shall be supplied alongwith each consignment.In addition the supplier shall ensure to send one copy of test certificates along withthe despatch documents to facilitate quick chance of the material.The ten certificates shall bear the followings informationAA 113 16, Rev.No.01 : Inoculants for cast ironsBHEL Order No.Manufacturer’s/Supplier’s Name.Trade mark, if any.Batch No.Quantity supplied

Date of manufactureTest Results of clauses 4.0,5.0 and 6.0.

9.0 PACKING AND MARKING:The material shall be supplied in mild steel drums of 100 kg. Capacity.AA 113 16 : Inoculants for cast ironBHEL Order No.Manufacturer’s/Supplier’s Name.Trade mark, if any.Batch/Lot No.Size and quantity suppliedDate of manufacture

10.0 REFERRED STANDARDS (Latest Publications Including Amendments):

1) IS:210

AA 113 16

Rev. No. 01

PAGE 2 OF 2