ASTM A922-93(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A 922 – 93 (Reapproved 2004)
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 3.2 Although silicon metal is purchased by total net weight,
the customary basis of payment is per pound of contained
1.1 This specification covers three regular grades of silicon
silicon.
metal designated as Grades A, B, and C.
1.2 The values stated in inch-pound units are to be regarded
4. Chemical Composition
as the standard. The SI equivalents of inch-pound units given
4.1 The grades shall conform to the requirements as to the
may be approximate.
chemical composition prescribed in Table 1.
2. Referenced Documents 4.2 The manufacturer shall furnish an analysis of each
2 shipment showing the silicon content and any other required
2.1 ASTM Standards:
element.
E 11 Specification for Wire Cloth and Sieves for Testing
4.3 Upon request of the purchaser, the manufacturer shall
Purposes
furnish an analysis of any trace elements on a schedule
E 29 Practice for Using Significant Digits in Test Data to
mutually agreed upon between the manufacturer (including
Determine Conformance with Specifications
their agents) and the purchaser.
E 32 PracticesforSamplingFerroalloysandSteelAdditives
for Determination of Chemical Composition
5. Size
E 50 Practices forApparatus, Reagents, and Safety Consid-
5.1 The grades of silicon metal are available in sizes listed
erations for Chemical Analysis of Metals, Ores, and
in Table 2.
Related Materials
5.2 The sizes listed in Table 2 are typical as shipped from
E 60 Practice for Analysis of Metals, Ores, and Related
the manufacturer’s plant. The various grades can exhibit
Materials by Molecular Absorption Spectrometry
different degrees of friability; therefore some attrition may be
E 360 Test Methods for Chemical Analysis of Silicon and
expected in transit, storage, and handling.Aquantitative test is
Ferrosilicon
not available for rating relative friability of silicon metal. A
3. Ordering Information code system has been developed, therefore, for this purpose,
and a number rating for each product type is shown in Table 3.
3.1 Orders for material under this specification shall include
DefinitionsapplicabletothesecodenumbersaregiveninTable
the following information:
3.
3.1.1 Quantity,
3.1.2 Name of material,
6. Sampling
3.1.3 ASTM designation and year of issue,
6.1 The material shall be sampled in accordance with
3.1.4 Grade,
Practices E 32.
3.1.5 Size, and
6.2 Other methods of sampling mutually agreed upon be-
3.1.6 Requirements for packaging, analysis reports, etc. as
tween the manufacturer and the purchaser may be used;
appropriate.
however, in case of discrepancy, Practices E 32 shall be used
for referee.
This specification is under the jurisdiction of ASTM Committee A01 on Steel, 7. Chemical Analysis
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
7.1 The chemical analysis of the material shall be made in
A01.18 on Castings.
accordance with the procedure for silicon metal as described in
Current edition approved Oct. 1, 2004. Published October 2004. Originally
approved in 1993. Last previous edition approved in 2000 as A 922 - 93 (2000).
Test Methods E 360 or alternative methods that will yield
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
equivalent results.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.2 If alternative methods of analysis are used, in case of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. discrepancy, Test Methods E 360 shall be used for referee.
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A 922 – 93 (2004)
TABLE 1 Chemical Requirements TABLE 3 Friability and Friability Ratings
Element Composition % Product Grade Proposed Friability Ratin
...