1、Designation: A 922 05Standard Specification forSilicon Metal1This standard is issued under the fixed designation A 922; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates th
2、e year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers several grades of silicon metal.1.2 The values stated in inch-pound units are to be regardedas the standard. The SI equivalents of inch-pound
3、 units givenmay be approximate.2. Referenced Documents2.1 ASTM Standards:2A 1025 Specification for Ferroalloys, General Require-mentsE11 Specification for Wire Cloth and Sieves for TestingPurposesE50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores,
4、 andRelated MaterialsE60 Practice for Analysis of Metals, Ores, and RelatedMaterials by Molecular Absorption SpectrometryE 360 Test Methods for Chemical Analysis of Silicon andFerrosilicon3. General Conditions for Delivery3.1 Materials furnished to this specification shall conform tothe requirements
5、 of Specification A 1025, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A 1025 constitutes nonconformance with thisspecification. In case of conflict between the requirements ofthis specification and S
6、pecification A 1025, this specificationshall prevail.4. Chemical Composition4.1 The grades shall conform to the requirements as to thechemical composition specified in Table 1.4.2 The manufacturer shall furnish an analysis of eachshipment showing the percentage of each element specified.4.3 Upon req
7、uest of the purchaser, the manufacturer shallfurnish an analysis of any trace elements on a schedulemutually agreed upon between the supplier and the purchaser.5. Size5.1 The various grades are available in sizes listed in Table2.5.2 The sizes listed in Table 2 are typical as shipped fromthe manufac
8、turers plant. The various grades can exhibitdifferent degrees of friability; therefore some attrition may beexpected in transit, storage, and handling. A quantitative test isnot available for rating relative friability of silicon metal. Acode system has been developed, therefore, for this purpose,an
9、d a number rating for each product type is shown in Table 3.Definitions applicable to these code numbers are given inSpecification A 1025.6. Chemical Analysis6.1 The chemical analysis of the material shall be made inaccordance with the procedure for silicon metal as described inTest Methods E 360 or
10、 alternative methods that will yieldequivalent results.6.2 If alternative methods of analysis are used, in case ofdiscrepancy, Test Methods E 360 shall be used for referee.6.3 Where a method is not given in Test Methods E 360 forthe analysis for a particular element, the analysis shall be madein acc
11、ordance with a procedure agreed upon between themanufacturer and the purchaser.NOTE 1For further information, see Practices E50and E60.7. Keywords7.1 silicon; silicon metal1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the dire
12、ct responsibility of SubcommitteeA01.18 on Castings.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1993. Last previous edition approved in 2004 as A 922 - 93 (2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
13、at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
14、59, United States.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue,A 922 - 93(2004), that may impact the use of this standard. (Approved May 1, 2005.)(1) Sections 1-10 were either modified or deleted. (2) Table 3 was modified.ASTM
15、International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are enti
16、rely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand
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18、 Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at
19、 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Chemical RequirementsElementComposition %Grade A Grade B Grade CSilicon 98.00 89.00 to 97.99 80.00 to 88.99Iron . . . 4.00 max 4.00 maxTABLE 2 Standard Sizes and TolerancesAStand
20、ard Sizes Tolerances8 by 2 in. (200 60 lb. (27.2 kg) lump, max 10 % max, passing 2 in.by 50 mm) (50 mm) sieve6 in. (150 mm) 10 % max, retained on 6 in. 12 % max, passing 8 Mby down (150 mm) sieve sieve4 in. (100 mm) 10 % max, retained on 4 in. 12 % max, passing 8 Mby down (100 mm) sieve sieve4by12 i
21、n. (100 10 % max, retained on 4 in. 10 % max, passing12 in.by 12.5 mm) (100 mm) sieve (12.5 mm) sieve4 by 1 in. (100 10 % max, retained on 4 in. 10 % max, passing 1 in.by 25 mm) (100 mm) sieve (25 mm) sieve3by12 in. (75 12 % max, retained on 3 in. 15 % max, passing12 in.by 12.5 mm) (75 mm) sieve (12
22、.5 mm) sieve3 by 1 in. (75 by 12 % max, retained on 3 in. 15 % max, passing 1 in.25 mm) (75 mm) sieve (25 mm) sieve2by12 in. (50 12 % max, retained on 3 in. 15 % max, passing12 in.by 12.5 mm) (75 mm) sieve (12.5 mm) sieve1 in. (25 mm) by 10 % max, retained on 1 in. 10 % max, passing No. 8.No. 8 (25
23、mm) sieve1 in. (25 mm) by 12 % max, retained on 1 in. 20 % max, passing No. 8.down (25 mm) sieveNo. 8 by down 10 % max, retained on No. . . .8 sieveNo. 20 by down 10 % max, retained on No. . . .20 sieveATolerances and sieve sizes defined by Specification E11.TABLE 3 Friability RatingsProduct Grade Proposed Friability RatingA5B5C5A922052
