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ASTM A922-05(2020)

(Specification)

Standard Specification for Silicon Metal

Standard Specification for Silicon Metal

ABSTRACT
This specification covers different sizes of several grades of silicon metal. The metal shall undergo chemical analysis and shall conform to specified chemical composition requirements.
SCOPE
1.1 This specification covers several grades of silicon metal.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. The SI equivalents of inch-pound units given may be approximate.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
29-Feb-2020
ICS
77.120.99 - Other non-ferrous metals and their alloys
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.18 - Castings
Current Stage
Ref Project

Relations

Replaces
ASTM A922-05(2015) - Standard Specification for Silicon Metal
Effective Date
01-Mar-2020
Refers
ASTM A1025/A1025M-10(2020) - Standard Specification for Ferroalloys and Other Alloying Materials, General Requirements
Effective Date
01-Mar-2020
Refers
ASTM E50-17 - Standard Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
Effective Date
01-Sep-2017
Refers
ASTM E50-11(2016) - Standard Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
Effective Date
01-Aug-2016
Refers
ASTM A1025/A1025M-10(2015) - Standard Specification for Ferroalloys and Other Alloying Materials, General Requirements
Effective Date
01-Nov-2015
Refers
ASTM E11-13 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
Effective Date
01-Oct-2013
Refers
ASTM E50-11 - Standard Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
Effective Date
15-Oct-2011
Refers
ASTM A1025/A1025M-10 - Standard Specification for Ferroalloys, General Requirements
Effective Date
01-Oct-2010
Refers
ASTM E11-09e1 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
Effective Date
01-May-2009
Refers
ASTM E50-00(2005) - Standard Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
Effective Date
01-May-2005
Refers
ASTM E60-98(2004) - Standard Practice for Analysis of Metals, Ores, and Related Materials by Molecular Absorption Spectrometry
Effective Date
01-May-2004
Refers
ASTM E11-04 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
Effective Date
01-May-2004
Refers
ASTM E11-95 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
Effective Date
10-May-2001
Refers
ASTM E11-01 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
Effective Date
10-May-2001
Refers
ASTM E360-96 - Standard Test Methods for Chemical Analysis of Silicon and Ferrosilicon
Effective Date
01-Jan-2001

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ASTM A922-05(2020) - Standard Specification for Silicon MetalASTM A922-05(2020) - Standard Specification for Silicon Metal
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ASTM A922-05(2020) - Standard Specification for Silicon Metal
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A922 −05 (Reapproved 2020)
Standard Specification for
Silicon Metal
This standard is issued under the fixed designation A922; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope purchase order. Failure to comply with the general require-
ments of Specification A1025/A1025M constitutes nonconfor-
1.1 This specification covers several grades of silicon metal.
mance with this specification. In case of conflict between the
1.2 The values stated in inch-pound units are to be regarded
requirements of this specification and Specification A1025/
as standard. The values given in parentheses are mathematical
A1025M, this specification shall prevail.
conversions to SI units that are provided for information only
and are not considered standard. The SI equivalents of inch-
4. Chemical Composition
pound units given may be approximate.
4.1 The grades shall conform to the requirements as to the
1.3 This international standard was developed in accor-
chemical composition specified in Table 1.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 4.2 The manufacturer shall furnish an analysis of each
Development of International Standards, Guides and Recom- shipment showing the percentage of each element specified.
mendations issued by the World Trade Organization Technical
4.3 Upon request of the purchaser, the manufacturer shall
Barriers to Trade (TBT) Committee.
furnish an analysis of any trace elements on a schedule
mutually agreed upon between the supplier and the purchaser.
2. Referenced Documents
2.1 ASTM Standards:
5. Size
A1025/A1025M Specification for Ferroalloys and Other Al-
5.1 The various grades are available in sizes listed in Table
loying Materials, General Requirements
2.
E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
5.2 The sizes listed in Table 2 are typical as shipped from
E50 Practices for Apparatus, Reagents, and Safety Consid-
the manufacturer’s plant. The various grades can exhibit
erations for Chemical Analysis of Metals, Ores, and
different degrees of friability; therefore, some attrition may be
Related Materials
expected in transit, storage, and handling.Aquantitative test is
E60 Practice for Analysis of Metals, Ores, and Related
not available for rating relative friability of silicon metal. A
Materials by Spectrophotometry
code system has been developed, therefore, for this purpose,
E360 Test Methods for Chemical Analysis of Silicon and
and a number rating for each product type is shown in Table 3.
Ferrosilicon (Withdrawn 2006)
Definitions applicable to these code numbers are given in
Specification A1025/A1025M.
3. General Conditions for Delivery
3.1 Materialsfurnishedtothisspecificationshallconformto
6. Chemical Analysis
the requirements of Specification A1025/A1025M, including
6.1 The chemical analysis of the material shall be made in
any supplementary requirements that are indicated in the
accordance with the procedure for silicon metal as described in
Test Methods E360 or alternative methods that will yield
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
equivalent results.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
6.2 If alternative methods of analysis are used, in case of
Current edition approved March 1, 2020. Published March 2020. Originally
discrepancy, Test M
...

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SCOPE
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This specification defines the criteria for the chemical composition and other requirements (including physical properties, microstructure, superficial hardness, and specific resistance ) for silver-graphite brushes for sliding electrical contacts. The percentage of silver, graphite, ash in graphite, and total metal impurities are prescribed. The minimum acceptable values for the physical properties such as density, determined by measurement and weight method, and shear strength are given. Typical Rockwell hardness and specific resistance for the material are also specified.
SCOPE
1.1 This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 75 weight % with the balance being substantially graphite.  
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SCOPE
1.1 This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 80 %, by weight, with the balance being substantially graphite.  
1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar will all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
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