ASTM_A_231_-_A_231M_-_15.pdf

Designation:A231/A231M15Standard Specification forChromium-Vanadium Alloy Steel Spring Wire1This standard is issued under the fixed designation A231/A231M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers round and shaped chromium-vanadium alloy steel spring wire having properties and qualityintended for the manufacture of springs used at moderatelyelevated temperatures.This wire shall be either in the annealedand cold-drawn or oil-tempered condition as specified by thepurchaser.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 standard.1.2.1 Within the text,the inch-pound units are shown inbrackets.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA510/A510M Specification for General Requirements forWire Rods and Coarse Round Wire,Carbon Steel,andAlloy SteelA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Ordering Information3.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material under thisspecification.Such requirements may include,but are notlimited to,the following:3.1.1 Quantity(mass),3.1.2 Name of material(chromium-vanadium alloy steelwire),3.1.3 Wire diameter(Table 1 and Section 8),3.1.4 Packaging(Section 14),3.1.5 Heat analysis report(if requested)(5.2),3.1.6 Certification or test report,or both,if specified(Sec-tion 13),and3.1.7 ASTM designation and date of issue.NOTE1A typical ordering description is as follows:20 000 kgoil-tempered chromium-vanadium alloy steel wire,size 6.00 mm in150-kg coils to ASTM A231/A231M dated_,or for inch-poundunits,40 000 lb oil-tempered chromium-vanadium alloy steel spring wire,size 0.250 in.in 350-lb coils to ASTM A231/A231M dated_.4.Materials and Manufacture4.1 The steel may be made by any commercially acceptedsteelmaking process.The steel may be either ingot cast orstrand cast.4.2 The finished wire shall be free from detrimental pipeand undue segregation.5.Chemical Composition5.1 The steel shall conform to the requirements of Grade6150 for chemical composition specified in Table 2.5.2 Heat AnalysisEach heat of steel shall be analyzed bythe manufacturer to determine the percentage of elementsprescribed in Table 2.This analysis shall be made from a testspecimen preferably taken during the pouring of the heat.When requested,this shall be reported to the purchaser andshall conform to the requirements of Table 2.5.3 Product AnalysisAn analysis may be made by thepurchaser from finished wire representing each heat of steel.The chemical composition thus determined,as to elementsrequired or restricted,shall conform to the product analysisrequirements specified in Table 4 of Specification A510/A510M.5.4 For referee purposes,Test Methods,Practices,andTerminology A751 shall be used.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.03 on Steel Rod and Wire.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1939.Last previous edition approved in 2010 as A231/A231M 10.DOI:10.1520/A0231_A0231M-15.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Mechanical Properties6.1 Annealed and Cold DrawnWhen purchased in theannealed and cold-drawn condition,the wire shall have beengiven a sufficient amount of cold working to meet the purchas-ers coiling requirements and shall be in a suitable condition torespond properly to heat treatment.In special cases thehardness,or tensile strength,if desired,shall be stated in thepurchase order.6.2 Oil TemperedWhen purchased in the oil-temperedcondition,the tensile strength and minimum percent reductionof area,sizes 2.50 mm 0.105 in.and coarser,of the wire shallconform to the requirements as shown in Table 1.Tensilestren