1、Designation: A481 05 (Reapproved 2015)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 Chromium andFerrochromium3. General Conditions for Delivery3.1 Materials furnished
4、to this specification shall conform tothe requirements of Specification A1025, 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 conf
5、lict 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 eachs
6、hipment 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
8、test 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 A1025.6. Chemical Ana
9、lysis6.1 The chemical analysis 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 c
10、ase ofdiscrepancy, Test Methods 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; chromiu
11、m 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 Nov. 1, 2015. Published November 2015. Originallyapproved in 1963. Last previous edition
12、approved in 2010 as A481 05 (2010).DOI: 10.1520/A0481-05R15.2For 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.C
13、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 1 Chemical RequirementsElementComposition, %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 0.010TABL
14、E 2 Supplementary Chemical RequirementsElementComposition, %Grade A Grade BNitrogen, max 0.050 0.020Iron, max 0.35 0.35Manganese, max 0.01 0.01Hydrogen, 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
15、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 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 0.001TABLE 3 Stan
16、dard Sizes and TolerancesProduct GradeStandardSizesTolerancesAFriabilityRatingChromiumMetalA 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) sie
17、ve14 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
18、 as listed inSpecification E11.A481 05 (2015)2ASTM 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, a
19、nd the riskof infringement of such rights, are entirely 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 revis
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22、tained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 05 (2015)3
