SAE-AMS-2759-7B-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]:://(LPC)andpositivepressuregasquenching,(PPGQ),typicallyreferredtoashighpressuregasquenching,(HPGQ).1.SCOPEThisspecification,inconjunctionwiththegeneralrequirementsforsteelheattreatmentcoveredinAMS2759,establishestherequirementsandproceduresforthreeclassesofgas,vacuum,liquid,andlowpressure(LPC)carburizingandrelatedheattreatmentofpartsfabricatedfromcarburizinggradesteels.Itdoesnotcoverpackcarburizing.1.1ClassificationPartstobecarburizedshallbeprocessedtomeettherequirementsofoneofthefollowingclasses:Class1:Casedepthandcasehardnessshallbeasspecified.SubsurfacecasehardnessshallbeinaccordancewithTable1.Surfacecarbonshallbe0.70to1.00%(weight%).Retainedausteniteshallnotexceed10%.Intergranularcarbidesshallbescatteredanddiscontinuousandshallnotbeevidentinmorethan40%ofthegrainboundaries.Class2:Casedepthandcasehardnessshallbeasspecified.SubsurfacecasehardnessshallbeinaccordancewithTable1.Surfacecarbonshallbe0.75to1.10%(weight%).Retainedausteniteshallnotexceed20%.Continuouscarbidenetworkshallnotbeevidentinmorethan80%ofthegrainboundaries.Class3:Casedepthandcasehardnessshallbeasspecified.1.1.1Ifclassisnotspecified,partsshallbeprocessedtomeettherequirementsofClass2.1.2TypesType1:GasandvacuumcarburizingType2:Liquid(saltbath)carburizingType3:LowPressure(vacuum)carburizing(0.5to35mbar)1.2.1Ifthetypeisnotspecified,Type1shallbeused.SAEAMS2759/7B-2-1.3Safety-HazardousMaterialsWhilethematerials,methods,applications,andprocessesdescribedorreferencedinthisspecificationmayinvolvetheuseofhazardousmaterials,thisspecificationdoesnotaddressthehazardsthatmaybeinvolvedinsuchuse.Itisthesoleresponsibilityoftheusertoensurefamiliaritywiththesafeandproperuseofanyhazardousmaterialsandtotakenecessaryprecautionarymeasurestoensurethehealthandsafetyofallpersonnelinvolved.2.APPLICABLEDOCUMENTSTheissueofthefollowingdocumentsineffectonthedateofthepurchaseorderformsapartofthisspecificationtotheextentspecifiedherein.Thesuppliermayworktoasubsequentrevisionofadocumentunlessaspecificdocumentissueisspecified.Whenthereferenceddocumenthasbeencancelledandnosupersedingdocumenthasbeenspecified,thelastpublishedissueofthatdocumentshallapply.2.1SAEPublicationsAvailablefromSAEInternational,400CommonwealthDrive,Warrendale,PA15096-0001,Tel:[phone](insideUSAandCanada)or724-776-4970(outsideUSA),(1517MPa)AMS2759/2HeatTreatmentofLow-AlloySteelPartsMinimumTensileStrength220ksi(1517MPa)andHigherAMS2759/11StressReliefofSteelPartsAMS2769HeatTreatmentofPartsinVacuumARP1820ChordMethodofEvaluatingSurfaceMicrostructuralCharacteristicsJ423MethodsofMeasuringCaseDepth2.2ASTMPublicationsAvailablefromASTMInternational,100BarrHarborDrive,P.O.BoxC700,WestConshohocken,PA19428-2959,Tel:[phone],:440-338-5151,–MetallographyandMicrostructures(1985Edition),ISBN10:0-87170-015-8SAEAMS2759/7B-3-3.TECHNICALREQUIREMENTS3.1EquipmentShallconformtotherequirementsofAMS2759.3.1.1QuenchingEquipmentShallbeinaccordancewithAMS2759andAMS2769sectiononinertgasquenching.3.1.2AuxiliaryEquipmentShallbeinaccordancewithAMS275