SAE-J1868-2010

__________________________________________________________________________________________________________________________________________SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright©2010SAEInternationalAllrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.TOPLACEADOCUMENTORDER:Tel:[phone](insideUSAandCanada)Tel:[phone](outsideUSA)Fax:[phone]Email:[e-mail]:://:DeletedSAEJ418becauseSAEcancelledthatspecificationinMay1999.ReplaceditwithequivalentASTMspecificationE112.Page4Note3:Deletedallreferencestotablesbecausetheyarecurrentlyunderreviewandhavenotbeenballoted.LeftinreferencetoSAEJ409.AddedASTME112tosection2.1.2.1.SCOPERestrictedhardenabilitysteelshavebeeninuseforsometimebutthespecificrestrictionsforaparticulargradedependuponcustomerneedsandvaryfrommilltomill.Suchsteelsaredesirabletoprovidemorecontrolledheattreatmentresponseanddimensionalcontrolforcriticalparts.Becauseofincreasinginterestinsteelswithrestrictedhardenability,theSAEIronandSteelTechnicalCommitteedirectedDivision8toprepareasetofstandardsteelswithrestrictedhardenability.In1993,theAmericanSocietyforTestingandMaterials(ASTM)adoptedthetwelveSAErestrictedhardenabilitysteelsandaddedtenmore.SAEdecidedtoincludeinSAEJ1868theadditional10steels.Ingeneral,steelswithrestrictedhardenability(RHsteels)willexhibitahardnessrangenotgreaterthan5HRCattheinitialpositionontheend-quenchhardenabilitybarandnotgreaterthan65%ofthehardnessrangeforstandardH-bandsteels(seeSAEJ1268)intheinflectionregion.GenerallytherestrictedhardenabilitybandfollowsthemiddleofthecorrespondingstandardH-band.AnexampleoftheRHbandcomparedwiththestandardH-bandisgivenforSAE4140inFigure1.2.REFERENCES2.1ApplicablePublicationsThefollowingpublicationsformapartofthisspecificationtotheextentspecifiedherein.ThelatestissueofSAEpublicationsshallapply.SAEJ1868RevisedFEB2010Page2of282.1.1SAEPublicationsAvailablefromSAEInternational,400CommonwealthDrive,Warrendale,PA15096-0001,Tel:[phone](insideUSAandCanada)or724-776-4970(outsideUSA),—PermissibleVariationsfromSpecifiedChemicalAnalysisofaHeatorCastofSteelSAEJ1268HardenabilityBandsforCarbonandAlloyHSteels2.1.2ASTMPublicationsAvailablefromASTMInternational,100BarrHarborDrive,P.O.BoxC700,WestConshohocken,PA19428-2959,Tel:[phone],(TheselimitsaresomewhatnarrowerthanallowedforstandardH-steels.)ItshouldbeunderstoodthatalloyswhichsatisfytherestrictedhardenabilitybandwillfallwithinSAEJ404compositionlimits,butnotallsteelsmeltedtothecompositionlimitswouldmeettherequiredRH-band.ThelimitsaregiveninTable1,andasindicatedinthefootnotes,aresubjecttopermissiblevariationsforproductanalysisandmaycontaincertainlevelsofelementsnotspecified.5.IDENTIFICATIONAsameansofidentifyingsteelsspecifiedtorestrictedhardenabilitybandlimits,thesuffixlettersRHhavebeenaddedtotheconventionalseriesnumber.Itisimportantthatsteelconsumersusethisspecialidentifyingdesignationinspecificationrequirements,asthereisnoothermeansofdeterminingwhenrestrictedhardenabilitybandlimitsapply.Whenthespecialidentificationisused,thesteelshallconformtoallconditionspertainingtochemicalcompositionlimits,restrictions,testingtechnique,andsoforth,asoutlinedherein.6.GRAINSIZEThelimitssetforthforRH-bandsareintendedtoapplytosteelsexhibitingafineausteniticgrainsize(ASTMNo.5orfiner;seeASTME112).--``,`````,,,,`,,`,`,,,`,``,,`,,-`-`,,`,,`,`,,`---SAEJ1868RevisedFEB2010Page3of287.USEOFRESTRICTEDHARDENABILITYLIMITSForspecificationpurposes,onemustusethetabulatedvaluesofRockwellhardness(HRC)a