1、Designation:B271/B271M18Standard Specification forCopper-Base Alloy Centrifugal Castings1This standard is issued under the fixed designation B271/B271M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A numbe
2、r in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification establishes requirements for centrifu-gal castings of copper-base alloys having the nominal compo-sitions shown in Table 1.
3、1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the
4、standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBar
5、riers to Trade(TBT)Committee.2.Referenced Documents2.1 The following documents in the current issue of theBook of Standards form a part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B208 Practice for Preparing Tension Test Specimens forCopper Alloy Sand,Permanent Mold,Cent
6、rifugal,andContinuous CastingsB824 Specification for General Requirements for CopperAlloy CastingsB846 Terminology for Copper and Copper AlloysE10 Test Method for Brinell Hardness of Metallic Materials2.3 ASME Code:3Boiler and Pressure Vessel Code3.Terminology3.1 Definitions of terms relating to cop
7、per alloys can befound in Terminology B846.4.Ordering Information4.1 Orders for centrifugal castings under this specificationshould include the following information:4.1.1 Specification title,number,and year of issue;4.1.2 Quantity(length or number)of castings;4.1.3 Copper Alloy UNS Number(Table 1)a
8、nd temper(as-cast,heat-treated,and so forth);4.1.4 Dimensions or drawing number and condition(as-cast,machined,and so forth);4.1.5 ASME Boiler and Pressure Vessel Code requirements(Section 9);and4.1.6 When castings are purchased for agencies of the U.S.Government,the Supplementary Requirements in Sp
9、ecificationB824 may be specified.4.2 The following are optional and should be specified inthe purchase order when required:4.2.1 Pressure test or soundness requirements(SpecificationB824),4.2.2 Approval of weld repair(Section 8),4.2.3 Certification(Specification B824),4.2.4 Foundry test report(Speci
10、fication B824),4.2.5 Witness inspection(Specification B824),4.2.6 Product marking(Specification B824),and4.2.7 Castings for seawater service(Section X1.2).5.Materials and Manufacture5.1 Castings in Copper Alloy UNS No.C95520 are used inthe heat-treated condition only.6.Chemical Composition6.1 The ce
11、ntrifugal castings shall conform to the chemicalrequirement shown in Table 2 for the Copper Alloy UNSNumbers specified in the purchase order.6.2 These specification limits do not preclude the presenceof other elements.Limits may be established and analysisrequired for unnamed elements agreed upon be
12、tween themanufacturer or supplier and the purchaser.Copper or zincmay be given as remainder and may be taken as the difference1This specification is under the jurisdiction ofASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.05 onCastings and Ingots fo
13、r Remelting.Current edition approved Oct.1,2018.Published October 2018.Originallyapproved in 1954.Last previous edition approved in 2015 as B271/B271M15.DOI:10.1520/B0271_B0271M18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.Fo
14、r Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.*A Summary of Changes section appear
15、s at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for
16、 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 between the sum of all elements analyzed and 100%.When allnamed elements in Table 2 are analyzed,their sum shall be asspecified in Table 3.7.Mechanical Properties7.1 Mechanical properties shall be determined from test barcastings cast in accordance with Practice B208 and shall meetthe requirements shown in Table 4.8.Weld Repair8.1 The castings s