1、Designation: A922 05 (Reapproved 2010)Standard Specification forSilicon Metal1This standard is issued under the fixed designation A922; 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 parenthe
2、ses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers several grades of silicon metal.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in pa
3、rentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard. The SI equivalents of inch-pound units given may be approximate.2. Referenced Documents2.1 ASTM Standards:2A1025 Specification for Ferroalloys and Other AlloyingMaterials, General
4、 RequirementsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical Analysis of Metals, Ores, andRelated MaterialsE60 Practice for Analysis of Metals, Ores, and RelatedMaterials by Molecular Absorption Spectromet
5、ryE360 Test Methods for Chemical Analysis of Silicon andFerrosilicon33. General Conditions for Delivery3.1 Materials furnished to this specification shall conform tothe requirements of SpecificationA1025, including any supple-mentary requirements that are indicated in the purchase order.Failure to c
6、omply with the general requirements of Specifica-tion A1025 constitutes nonconformance with this specification.In case of conflict between the requirements of this specifica-tion and Specification A1025, this specification shall prevail.4. Chemical Composition4.1 The grades shall conform to the requ
7、irements 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 request of the purchaser, the manufacturer shallfurnish an analysis of any trace elements on a schedulemutually agreed
8、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 manufacturers plant. The various grades can exhibitdifferent degrees of friability; therefore some attrition may beexpected
9、 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,and a number rating for each product type is shown in Table 3.Definitions applicable to these code numbers are given i
10、nSpecification A1025.6. Chemical Analysis6.1 The chemical analysis of the material shall be made inaccordance with the procedure for silicon metal as described inTest Methods E360 or alternative methods that will yieldequivalent results.6.2 If alternative methods of analysis are used, in case ofdisc
11、repancy, Test Methods E360 shall be used for referee.6.3 Where a method is not given in Test Methods E360 forthe analysis for a particular element, the analysis shall be madein accordance with a procedure agreed upon between themanufacturer and the purchaser.NOTE 1For further information, see Practi
12、ces E50 and 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 direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved April 1, 2010. Published May 2010. Original
13、lyapproved in 1993. Last previous edition approved in 2005 as A922-05. DOI:10.1520/A0922-05R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Documen
14、t Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon 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 max1Copyright ASTM Internationa
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20、tm.org/COPYRIGHT/).TABLE 2 Standard Sizes and TolerancesAStandard 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
21、4 in. 12 % max, passing 8 Mby down (100 mm) sieve sieve4by12 in. (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
22、 on 3 in. 15 % max, passing12 in.by 12.5 mm) (75 mm) sieve (12.5 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
23、10 % max, retained on 1 in. 10 % max, passing No. 8.No. 8 (25 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 RatingA5B5C5A922 05 (2010)2
