ASTM A922-93(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A 922 – 93 (Reapproved 2000)
Standard Specification for
Silicon Metal
This standard is issued under the fixed designation A 922; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Chemical Composition
1.1 This specification covers three regular grades of silicon 4.1 The grades shall conform to the requirements as to the
metal designated as Grades A, B, and C. chemical composition prescribed in Table 1.
1.2 The values stated in inch-pound units are to be regarded 4.2 The manufacturer shall furnish an analysis of each
as the standard. The SI equivalents of inch-pound units given shipment showing the silicon content and any other required
may be approximate. element.
4.3 Upon request of the purchaser, the manufacturer shall
2. Referenced Documents
furnish an analysis of any trace elements on a schedule
2.1 ASTM Standards:
mutually agreed upon between the manufacturer (including
E 11 Specification for Wire-Cloth Sieves for Testing Pur- their agents) and the purchaser.
poses
5. Size
E 29 Practices for Using Significant Digits in Test Data to
Determine Conformance with Specifications 5.1 The grades of silicon metal are available in sizes listed
E 32 Practices for Sampling Ferroalloys and Steel Additives in Table 2.
for Determination of Chemical Composition 5.2 The sizes listed in Table 2 are typical as shipped from
E 50 Practices for Apparatus, Reagents, and Safety Precau- the manufacturer’s plant. The various grades can exhibit
tions for Chemical Analysis of Metals different degrees of friability; therefore some attrition may be
E 60 Practice for Photometric and Spectrophotometric expected in transit, storage, and handling. A quantitative test is
Methods for Chemical Analysis of Metals not available for rating relative friability of silicon metal. A
E 360 Test Methods for Chemical Analysis of Silicon and code system has been developed, therefore, for this purpose,
Ferrosilicon and a number rating for each product type is shown in Table 3.
Definitions applicable to these code numbers are given in Table
3. Ordering Information
3.
3.1 Orders for material under this specification shall include
6. Sampling
the following information:
3.1.1 Quantity, 6.1 The material shall be sampled in accordance with
3.1.2 Name of material, Practices E 32.
3.1.3 ASTM designation and year of issue, 6.2 Other methods of sampling mutually agreed upon be-
3.1.4 Grade, tween the manufacturer and the purchaser may be used;
3.1.5 Size, and however, in case of discrepancy, Practices E 32 shall be used
3.1.6 Requirements for packaging, analysis reports, etc. as for referee.
appropriate.
7. Chemical Analysis
3.2 Although silicon metal is purchased by total net weight,
7.1 The chemical analysis of the material shall be made in
the customary basis of payment is per pound of contained
silicon. accordance with the procedure for silicon metal as described in
Methods E 360 or alternative methods that will yield equiva-
lent results.
7.2 If alternative methods of analysis are used, in case of
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
discrepancy, Methods E 360 shall be used for referee.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
7.3 Where no method is given in Methods E 360 for the
Current edition approved Dec. 15, 1993. Published March 1994.
analysis for a particular element, the analysis shall be made in
Annual Book of ASTM Standards, Vol 14.02.
accordance with a procedure agreed upon between the manu-
Annual Book of ASTM Standards, Vol 03.05.
Annual Book of ASTM Standards, Vol 03.06. facturer and the purchaser.
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A 922 – 93 (2000)
TABLE 1 Chemical Requirements TABLE 3 Friability and Fria
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