1、Designation: A481 05 (Reapproved 2010)Standard Specification forChromium Metal1This standard is issued under the fixed designation A481; 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 parenth
2、eses 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 chromiummetal.1.2 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Docu
3、ments2.1 ASTM Standards:2A1025 Specification for Ferroalloys and Other AlloyingMaterials, General RequirementsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE363 Test Methods for Chemical Analysis of Chromiumand Ferrochromium3. General Conditions for Delivery3.1 Materials furnished
4、to this specification shall conform tothe requirements of SpecificationA1025, including any supple-mentary requirements that are indicated in the purchase order.Failure to comply with the general requirements of Specifica-tion A1025 constitutes nonconformance with this specification.In case of confl
5、ict between the requirements of this specifica-tion and Specification A1025, this specification shall prevail.4. Chemical Composition4.1 The various grades shall conform to the requirements asto chemical composition specified in Tables 1 and 2.4.2 The manufacturer shall furnish an analysis of eachsh
6、ipment showing the elements specified in Table 1.4.3 The values shown in Table 2 are expected maximums.Upon request of the purchaser, the manufacturer shall furnishan analysis for any of these elements on a cumulative basisover a period mutually agreed upon between the manufacturerand the purchaser.
7、5. Size5.1 The various grades are available in sizes as listed inTable 3.5.2 The sizes listed in Table 3 are typical as shipped fromthe manufacturers plant. These alloys exhibit varying degreesof friability; therefore, some attrition may be expected intransit, storage, and handling. A quantitative t
8、est is not avail-able for rating relative friability of ferroalloys. A code systemhas been developed, therefore, for this purpose, and a numberrating each product type is shown in the last column of Table3. Definitions applicable to these code numbers are given inSpecification A1025.1This specificat
9、ion 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. Originallyapproved in 1963. Last previous edition approved in 2005 as A481 05
10、. DOI:10.1520/A0481-05R10.2For 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 Document Summary page onthe ASTM website.TABLE 1 Chemical RequirementsElemen
11、tComposition, %Grade A Grade BChromium, min 99.0 99.4Carbon, max 0.050 0.050Silicon, max 0.15 0.10Sulfur, max 0.030 0.010Phosphorus, max 0.010 0.010TABLE 2 Supplementary Chemical RequirementsElementComposition, %Grade A Grade BNitrogen, max 0.050 0.020Iron, max 0.35 0.35Manganese, max 0.01 0.01Hydro
12、gen, max 0.01 0.003Oxygen, max 0.50 0.10Vanadium, max 0.050 0.050Copper, max 0.01 0.01Molybdenum, max 0.050 0.01Columbium, max 0.050 0.050Tantalum, max 0.050 0.003Cobalt, max 0.003 0.001Aluminum, max 0.30 0.10Titanium, max 0.050 0.003Zirconium, max 0.050 0.003Arsenic, max 0.005 0.003Lead, max 0.003
13、0.001Tin, max 0.001 0.001Zinc, max 0.005 0.003Boron, max 0.005 0.003Antimony, max 0.005 0.003Silver, max 0.003 0.001Bismuth, max 0.003 0.0011Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Chemical Analysis6.1 The chemical analysis
14、 of the material shall be made inaccordance with the procedure for the ferroalloys as describedin Test Methods E363 or alternative methods, agreed upon bythe purchaser and supplier, that will yield equivalent results.6.2 If alternative methods of analysis are used, in case ofdiscrepancy, Test Method
15、s E363 shall be used for referee.6.3 Where no method is given in Test Methods E363 for theanalysis for a particular element, the analysis shall be made inaccordance with a procedure agreed upon between the manu-facturer and the purchaser.7. Keywords7.1 chromium; chromium metalASTM International take
16、s 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 entirely their own res
17、ponsibility.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 should be address
18、ed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the
19、 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 610-832-9585 (pho
20、ne), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 3 Standard Sizes and TolerancesProduct GradeStandardSizesTolerancesAFriabilityRatingC
21、hromiumMetalA Plate 2 in. bydown10 %, max retained on2-in. (50-mm) sieve10 %, max passing U.S.No. 8 (2.36-mm) sieve2A and B 1 in. by down 15 %, max retained on1-in. (25.0-mm) sieve15 %, max passing U.S.No. 8 (2.36-mm) sieve14 in. by down 5 %, max retained on14-in. (6.3-mm) sieve8 mesh by down 5 %, max retained onU.S. No. 8 (2.36-mm)sieve20 mesh bydown5 %, max retained onU.S. No. 20 (850 m)sieveB Pellets 112 in. by1in.by1in.Designated by manufac-turerASpecifications of sieve sizes used to define tolerances herein are as listed inSpecification E11.A481 05 (2010)2
