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है”ह”ह

IS 2022 (1997): Calcium silicon [MTD 5: Ferro Alloys]

IS 2022 : 1997

g-77Rb?m =A fY fit-x ChITtlYYltll~lch i+ - fwl-k

myjjm) Indian Standard

CALCIUMSILICON - SPECIFICATION

( Third Revision )

ICS 77.100

0 BIS 1997

BUREAU OF INDIAN STANDARDS h4ANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

May 1997 Price Group 1

Ferro Alloys Sectional Committee, MTD 5

FOREWORD

This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Ferro Alloys Sectional Committee had been approved by the Metallurgical Engineering Division Council.

This standard was first published in 1%5 and was subsequently revised in 1972 and 1988. In view of the experience gained during these years, it was felt necessary to revise this standard. In this revision, the following main modifications have been made:

a) Definition of the consignment has been incorporated;

b) Limits for sulphur, phosphorus, iron and aluminium for both the grades of Calciumsilicon have been specified; and

c) Particle size range has been modified.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revtied)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 2022 : 1997

-;i Indian Standard

CALCIUMSILICON - SPECIFICATION

( Third Revision )

1 SCOPE

This standard covers the requirements and condi- tion of delivery of calciumsilicon used mainly by the iron and steel industry.

2 REFERENCES

The following Indian Standards are necessary ad- juncts to this standard:

IS No. Title

1387 : 1993 General requirements for the supply of metallurgical materials (second revision)

1472 : 1977 Method of sampling ferroalloys for determination of chemical composition (first revision)

2018 : 1964 Method of chemical analysis of calciumsilicon

3 TERMINOLOGY

For the purpose of this standard, the following definitions shall apply.

3.1 Calciumsilicon

A master alloy of iron, silicon and calcium with silicon contents in the range from 55 to 75 percent by mass, and calcium contents in the range from 25 to 35 percent by mass, obtained by reduction from the corresponding raw materials or their con- centrates.

3.2 Cast (Melt)

The product of any of the following: a) One furnace heat; or b) One tap of continuous furnace; or c) A number of furnace or crucible heats of

similar composition mixed in a ladle or holding furnace and used for making a cast.

3.3 Consignment

3.3.1 Tapped Lot Method

A consignment constituted by the tapped lot method consists of calciumsilicon mass of the one melt (or one part of continuous tap).

1

3.3.2 Graded Lot Method

A consignment constituted by the graded lot method consists of a number of melts (or parts of continuous taps) of one calciumsilicon designation. The calcium and silicon content of the metls (or parts of continuous taps) constituting the consign- ment shall not differ from each other by more than 3 percent absolute.

3.3.3 Blended Lot Method

A consignment constituted by the blended lot method consists of a number of melts (or parts of continuous taps) of one calciumsilicon designation, which have been crushed to a particle size less than 50 mm and thoroughly mixed. The content of the main constituent of the melts (or parts of con- tinuous taps) constituting the consignment may vary between the minimum and maximum limits specified for the appropriate calciumsilicon desig- nation.

4 GRADES

This standard covers two grades of calciumsilicon as specified in Table 1.

5 PARTICULARS TO BE SPECIFIED WHILE ORDERING

For the benefit of the purchaser, particulars to be specified while ordering for the material to this specification shall be as follows:

a) b) 4 4 e> 9

Quantity of the material; Constitution of consignment; Name of the material; Grade; Size range; and Necessary requirements for analysis reports, packing, etc, as appropriate.

6 SUPPLY OF MATERIAL

General requirements relating to supply of the material to this specification shall be as laid down in IS 1387. ,

7 REQUIREMENTS

7.1 Constitution of Consignment

Calciumsilicon shall be delivered in consignment constituted by one of the method defined in 3.2.

IS 2022 : 1997

7.2 Chemical Composition

7.2.1 Each consignment of the material shall con- form to the requirements of the chemical composi- tion specified in Table 1 and if so specified by the purchaser at the time of enquiry and order, the supplier shall supply a test certificate of chemical analysis of the sample of material for each melt.

7.2.2 If specified by the purchaser at the time of enquiry and order that each lump of the consign- ment should conform to the chemical composition specified in Table 1, this shall be agreed to between the purchaser and the manufacturer.

7.2.3 The chemical composition given in Table 1 shows only the main constituent elements and the usual impurities. If the purchaser requires closer ranges for the main element contents and/or dif- ferent limits for specified element and/or non- specified elements, this shall be agreed to between the purchaser and the manufacturer.

Table 1 Chemical Composition of Calciumsilicon (Clauses 4,7.2.1,7.2.2 and 7.2.3)

Grade Composition, Percent

Desknation %a

k

Si C S P Fe Al’ Max Max Max Max Max

Ca30 Si 30-35 60-65 1.0 0.03 0.05 4.0 1.5

Ca25 Si 25-30 65-70 1.0 0.03 0.03 3.0 1.0

7.2.4 The chemical composition of the material shall be determined either by the method specified in IS 2018 or any other established instrumen- tal/chemical method. In case of dispute, the proce- dure given in the latest version of IS 2018 shall be the referee method. Wowever, where the method is not given in IS 2018, the referee method shall be agreed to between the purchaser and the manufac- turer.

8 SIZE RANGE

8.1 The material shall be supplied in lumps or as crushed and screened particles. The particle size ranges and tolerances shall be as given in Table 2. The undersize values shall be valid at the point of delivery to the purchaser.

8.2 If the purchaser requires different size ranges and/or tolerances other than those given in Table 2, these shall be agreed upon between the supplier and the purchaser.

Table 2 Particle Size Range (Clauses 8.L8.2 ana! 9)

Size St&%ange, mm Undersize Designation r A

Over Up to 7 Percent

MaU and

Including

1 20 20 10

2 2 20 10

3 Upto

Oversize Remarks Percent

Max

10 No piece to exceed 1.15 times

10 the maximum limit of

10 size range specified in two or three directions

9 EXTRANEOUS CONTAMINATION

The material shall be generally free from ex- traneous contaminations like slag and non-metallic inclusion etc.

10 SAMPLING

10.1 Each consignment of the material shall be sampled in accordance with IS 1472 for chemical analysis.

10.2 For sieve analysis and size determination the method of sampling shall be mutually agreed to between the purchaser and the supplier.

11 PACKING

The material shall be supplied packed in suitable containers in quantities mutually agreed to be- tween the supplier and the purchaser.

12 MARKING

The package containing the material shall be marked legibly and indelibly with the following:

a) Supplier’s name and trade-mark;

b) Grade designation and size;

C> Quantity;

d) Date of manufacture; and

e> Shelf life, if needed.

12.1 BIS Certification Marking

The material may also be marked with Standard Mark.

12.1.1 The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards Act, 1986 and the Rules and Regulations made there- under. The details of conditions under which the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.

2

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publication), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards Monthly Additions’,

This Indian Standard has been developed from Dot: No. MTD 5 (4072).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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