Designation:B598−14aStandardPracticeforDeterminingOffsetYieldStrengthinTensionforCopperAlloys1ThisstandardisissuedunderthefixeddesignationB598;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticeestablishestherequirementsfordetermin-ingoffsetyieldstrength(0.01%,0.02%,and0.05%offset)atroomtemperature.Itisintendedforcopperalloysintemperscommonlyusedforspringapplications,andmaterialsthickerthan0.010in.(0.25mm).1.1.1Theprimaryapplicationofthispracticeisintendedforflatstripmaterialsthatareusedforsprings;however,thispracticecanbeusedforotherproductforms,suchaswire,rod,andbar.1.2Units—Valuesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitswhichareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B846TerminologyforCopperandCopperAlloysE4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE8/E8MTestMethodsforTensionTestingofMetallicMa-terialsE83PracticeforVerificationandClassificationofExten-someterSystems3.Terminology3.1Fordefinitionsoftermsrelatedtocopperandcopperalloys,refertoTerminologyB846.3.2Fordefinitionsoftermsrelatedtomechanicaltesting,refertoTerminologyE6.4.SummaryofPractice4.1Todeterminetheoffsetyieldstrength,itisnecessarytoacquiredata(autographicornumerical)fromwhichastress-straindiagrammaybedrawn.Thestressatwhichaspecifieddeviationofstrainfromthelinearportionofthestress-straincurv...
