Designation:A914/A914M−16StandardSpecificationforSteelBarsSubjecttoRestrictedEnd-QuenchHardenabilityRequirements1ThisstandardisissuedunderthefixeddesignationA914/A914M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcovershot-workedalloyandcarbon-boronsteelsdesignedtoattainrestricteddepthofhardeningintheend-quenchtest.Thesesteelcompositionsareidentifiedbythesuffixletter“RH”addedtotheconventionalgradenumber.1.2Ingeneral,steelswithrestrictedhardenability(RHsteels)willexhibitahardnessrangenotgreaterthan5HRCattheinitialpositionontheend-quenchhardenabilitybarandnotgreaterthan65%ofthehardnessrangeforstandardH-bandsteels(SpecificationA304)intheinflectionregion.GenerallytherestrictedhardenabilitybandfollowsthemiddleofthecorrespondingstandardH-band.AnexampleoftheRHbandcomparedwiththeHbandisgivenforGrade4140inFig.1.1.2.1ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisspecificationisexpressedinbothinch-poundunitsandSIunits.However,thematerialwillbesuppliedtoinch-poundunitsunlessthepurchaseorderspecifiesthe“M”specificationdesignation.2.ReferencedDocuments2.1ASTMStandards:2A29/A29MSpecificationforGeneralRequirementsforSteelBars,CarbonandAlloy,Hot-WroughtA255TestMethodsforDeterminingHardenabilityofSteelA304SpecificationforCarbonandAlloySteelBarsSubjecttoEnd-QuenchHardenabilityRequirementsE112TestMethodsforDeterminingAverageGrainSize2.2SAEStandards:3J406MethodsofDeterminingHardenabilityofSteelsJ1268HardenabilityBandsforCarbonandAlloyHSteelsJ1868RestrictedHardenabilityBandsforSelectedAlloySteels3.Terminology3.1Definitionso...
