1、Designation: A 481 05Standard Specification forChromium Metal1This standard is issued under the fixed designation A 481; 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 t
2、he year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense. This specification replaces Federal SpecificationQQ-F-145.1. Scope*1.1 This specification covers
3、several grades of chromiummetal.1.2 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2A 1025 Specification for Ferroalloys, General Require-mentsE11 Specification for Wire Cloth and Sieves for TestingPurposesE 363 Test Methods for Chem
4、ical Analysis of Chromiumand Ferrochromium3. General Conditions for Delivery3.1 Materials furnished to this specification shall conform tothe requirements of Specification A 1025, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requ
5、irements ofSpecification A 1025 constitutes nonconformance with thisspecification. In case of conflict between the requirements ofthis specification and Specification A 1025, this specificationshall prevail.4. Chemical Composition4.1 The various grades shall conform to the requirements asto chemical
6、 composition specified in Tables 1 and 2.4.2 The manufacturer shall furnish an analysis of eachshipment 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 o
7、n a cumulative basisover a period mutually agreed upon between the manufacturerand the purchaser.5. Size5.1 The various grades are available in sizes as listed inTable 3.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the direct
8、 responsibility of SubcommitteeA01.18 on Castings.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1963. Last previous edition approved in 2004 as A 481 94 (2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
9、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 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,
10、 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 0.01Hydrogen, 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
11、 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 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 0.0
12、03 0.0011*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 19428-2959, United States.5.2 The sizes listed in Table 3 are typical as shipped fromthe manufacturers plant. These alloys exhibit varyin
13、g degreesof friability; therefore, some attrition may be expected intransit, storage, and handling. A quantitative 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
14、last column of Table3. 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 the ferroalloys as describedin Test Methods E 363 or alternative methods, agreed upon b
15、ythe purchaser and supplier, that will yield equivalent results.6.2 If alternative methods of analysis are used, in case ofdiscrepancy, Test Methods E 363 shall be used for referee.6.3 Where no method is given in Test Methods E 363 for theanalysis for a particular element, the analysis shall be made
16、 inaccordance with a procedure agreed upon between the manu-facturer and the purchaser.7. Keywords7.1 chromium; chromium metalSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue,A 481 - 94(2004), that may impact the use of this standa
17、rd. (Approved May 1, 2005.)(1) Sections 1-10 were either modified or deleted. (2) Appendix X1 was deleted.ASTM 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 tha
18、t determination of the validity of any such patent rights, and 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 reappro
19、ved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you fe
20、el that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on 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 rep
21、rints (single or multiple copies) of this standard may be obtained 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).TABLE 3 Standard Sizes and TolerancesProduct GradeStandardSizesTolerancesAF
22、riabilityRatingChromiumMetalA 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.A481052
