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TheEngineeringSocietyForAdvancingMobilityLandSeaAirandSpace®INTERNATIONALIHISAETechnicalStandardsBoardRulesprovidethat:κThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser."SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.QUESTIONSREGARDINGTHISDOCUMENT:(412)772-8512FAX:(412)776-0243TOPLACEADOCUMENTORDER;(412)776-4970FAX:(412)776-0790Copyright1995SocietyofAutomotiveEngineers,Inc.Allrightsreserved.PrintedinU.S.A.SAEJ1268RevisedMAY95-2-ChemicalCompositionLimits—Topermitsteelproducersthenecessarylatitudetomeetthestandardhardenabilitylimits,thechemicalcompositionlimitsofthesesteelshavebeenbroadenedsomewhatfromthoselimitsapplicabletothesamegradeswhenspecifiedbychemicalcompositiononly(SAEJ403andJ404).Thesebroaderlimitspermitadjustmentsinmanufacturingrangesofcompositiontocompensateforindividualplantmeltingprocedureswhichmightotherwiseinfluencethelevelsandwidthsofthebands.Themodificationshavenotbeengreatenoughtoinfluencethegeneralcharacteristicsoftheoriginalcompositionsoftheseriesunderconsideration.Thechemicalcompositionlimitsforelectricfurnace,openhearth,andBOFsteelsareoutlinedinTables1and2ofthisdocumentandaresubjecttothepermissiblevariationsforproductanalysisoutlinedinTables1and3ofSAEJ409.TABLE1—CARBONANDCARBONBORONHSTEEL(ladlechemicalcomposition,weight%,forelementsshown;seeFigures3to16forrespectiveH-bands)UNSNo.SAESteelNo.CMnSiP,max⑴S,max⑴H10380H10450H15220H15240H15260H15410H15211H15281H15301H15351H15371H15411H15481H152611038H0.34/0.430.50/1.000.15/0.350.0300.0501045H0.42/0.510.50/1.000.15/0.350.0300.0501522H0.17/0.251.00/1.500.15/0.350.0300.0501524H0.18/0.261.21/1.750.15/0.350.0300.0501526H0.21/0.301.00/1.500.15/0.350.0300.0501541H0.35/0.451.25/1.750.15/0.350.0300.05015B21H⑵0.17/0.240.70/1.200.15/0.350.0300.05015B28H⑵0.25/0.341.00/1.500.15/0.350.0300.05015B30H⑵0.27/0.350.70/1.200.15/0.350.0300.05015B35H⑵°.31∕0.390.70/1.200.15/0.350.0300.05015B37H⑵0.30/0.391.00/1.500.15/0.350.0300.05015B41H⑵0.35/0.451.25/1.750.15/0.350.0300.05015B48H⑵°.43∕0.531.00/1.500.15/0.350.0300.05015B62H⑵0.54/0.671.00/1.500.40/0.600.0300.0501.Ifelectricfurnacepracticeisspecifiedorrequired,thelimitsforphosphorusandsulfurare0.025%,respectively,andtheprefixEisaddedtotheSAEnumber,forexample,E1038H.2.Thesesteelscontain0.0005to0.003%boron.SAEJ1268RevisedMAY95TABLE2—⑴STANDARDALLOYHSTEELCOMPOSITIONS（ladlechemicalcomposition,weight%,forelementsShoWn化）。）seeFigures17to88forrespectiveH-bands）UNSNo.SAESteelNo.CMnSiNiCrMoVH133001330H0.27/0.331.45/2.050.15/0.35————H133501335H0.32/0.381.45/2.050.15/0.35————H134001340H0.37/0.441.45/2.050.15/0.35————————H134501345H0.42/0.491.45/2.050.15/0.35————H402704027H0.24/0.300.60/1.000.15/0.35——0.20/0.30—H40280⑷4028H⑷0.24/0.300.60/1.000.15/0.35——0.20/0.30—H403204032H0.29/0.350.60/1.000.15/0.35——0.20/0.30—H403704037H0.34/0.410.60/1.000.15/0.35——0.20/0.30—H404204042H0.39/0.460.60/1.000.15/0.35——0.20/0.30—H404704047H0.44/0.510.60/1.000.15/0.35——0.20/0.30—H411804118H0.17/0.230.60/1.000.15/0.35—0.30/0.700.80/0.15—H412004120H0.18/0.230....