SKF 热处理标准

Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page1/111.OBJECTIVEThisspecificationisageneralqualitystandardforDeepGrooveBallBearing(DGBB)ringsinthemartensiticthroughhardenedandtemperedconditionsasdeliveredforgrindingandfinishing.Thisspecificationcoversproductrequirementsandgivesreferencestotestingstandardsand/ortestingmethodstobeused.Thesubcontractorshallberesponsibleforperformingthenecessaryteststoensuretheprocessconditionsandproductqualitystandardsrequiredbythisspecificationaremet.Thetestandcontrolroutines,administrationanddocumentationshallfollowrecommendationbyinternationalorganisationsandSKF.AlldeviationsfromthisspecificationmustbeapprovedbySKF.2.APPLICATIONFIELDAlltheDGBBringsmadeofbearingsteelgrade(e.g.SKF3,SKF3S…orequivalent)whichdrawingreferstothisspecification.3.METALLURGICALREQUIREMENTSAFTERHEATTREATMENT3.1Hardness3.1.1SurfacehardnessasmeasuredontheringsfaceThemethodtobeusedforthesurfacehardnessmeasurementsisHRC(RockwellC)accordingtoISO6508/1standardrequirementsinforce.TheHRCsurfacehardnessshallbemeasuredontheringsfaceafterslightgrindingtoremovetheheattreatmentoxidation.IfitisnotpossibletoapplyRockwellChardnessmeasurements(facewidthnotenoughlarge),HV10method(VickersLoad10kg)shallbeappliedaccordingtoISO6507/1standardwithanappropriatedsurfacepreparation(polishing).TheHRCorHV10surfacehardnessresultsshallbewithinthelimitsgiveninthefollowingtableaccordingtothebearingringstabilisation:BearingringstabilisationHardnessHRCHardnessHV10(1)SN62-65735-820TemperedS0060-64690-790S058-62645-735S157-61625-715StabilisedS256-59605-665(1)AccordingtoSKFS&PD30page252.4:Hardnesstestingmethodsformetallicmaterials.3.1.2SurfacetracklayerhardnessThesurfacetracklayerisconsideredtobe3mmdeepfromtheringracewaygroovesurface.ThemethodtobeusedforhardnessmeasurementsisHV10(VickersLoad10kg)accordingtoISO6507/1standardinforce.TheHV10hardnessshallbemeasuredonthesurfacetracklayer,onacrosssectionedprofilesampleafteraxialcuttingandappropriatesurfacepreparation.Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page2/11Inthesurfacetrack-layer,thehardnessshallbewithinthelimitsgiveninthefollowingtableaccordingtotheappliedbearingringstabilisation:BearingringstabilisationHardnessHV10(1)SN735-820TemperedS00690-790S0645-735S1625-715StabilisedS2605-665(1)ConvertedfromHRCtolerancesaccordingtoSKFS&PD30page252.4:Hardnesstestingmethodsformetallicmaterials.3.2Microstructures,decarburisationandretainedaustenitecontent3.2.1GeneralTheringsshallbemartensiticthroughhardenedandtemperedtomeetthespecifiedmetallurgicalrequirements.Themicrostructureshallconsistoffinemartensitewithevenlydispersedcarbidesandnegligibleamountofslackquenchphase(troostite).3.2.2MartensiteappearanceandslackquenchphaseThemartensiticmicrostructuresappearanceandslackquenchphaseshallbeevaluatedonacrosssectionedprofilesampleafteraxialcutting,appropriatesurfacepreparationandNital1.5%etching.ThemartensiticmicrostructuresappearanceandslackquenchphaseshallberatedatX1000magnificationusingreferencepicturesgivenintheenclosureNr1.Themartensiticmicrostructuresappearanceandslackquenchphaseinthesurfacetrack-layer(asdefinedinsection3.1.2)uptoadepthof3mmshallnotexceedthelimitsgiveninthefollowingtableaccordingtotheappliedbearingringstabilisationandringwallthickness:MartensiteRingwallthickness(1)Slackquenchphase(Troostite)Temperedring(SN&S00)Stabilisedrings(S0,S1…)Fora≤10mmTG3/TN3maxiFora>10mmTG4/TN4maxiMT4maxiMS4maxi1)Definitionofthewallthickness.The"a"sectionisdefinedasthematerialthickness,whichisthecontrollingfactorintheheattreatmentprocess.GA=thetotalGrindingAllowanceonbothsurfacesacrosswhichthe"a"sectionismeasured.Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page3/11ForDeepGrooveBallBearings(DGBB)a=D-dk2+GAa=Dk-d2+GADdkaDkda3.2.3DecarburisationThedecarburisationshallbeevaluatedwithanappropriatemagnification(X1000,X500dependingfromthedecarburisationdepth)onacrosssectionedprofilesampleafteraxialcuttingandmetallographicsurfacepreparation.Typicaldecarburisedmicrostructuresaregivenforinformationinenclosure2.Themaximumdecarburisationdepthonthewholeringsurface/areasshallnotexceedthelimitsgiveninthefollowingtable:FreeferritePartialdecarburisationNotadmissible0.020mmmaximum3.2.4RetainedaustenitecontentThemethodtobeusedforretainedaustenitecontentsmeasurementsisX-raydiffraction.Theretainedaustenitecontentinthesurfacetracklayerasdefinedinsection3.1.2shallnotexceedthelimitsgiveninthefollowingtable:BearingringstabilisationRetainedaustenitecontent(%)SN≤15TemperedS00≤8S0≤3S1≤1StabilisedS2≤1Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page4/113.3DimensionalstabilityIncaseofheattreatmenttroubles(e.g.highretainedaustenitecontents…),theringsconformityshallbeverifiedbyadimensionalstabilitytest.Thistestisperformedonfinishedrings,theouterdiameterD(mm)ismeasuredbefore(D1)andafteranadditionaltempering(D2)whichdependoftheappliedstabilisation:StabilityclassTesttemperature(°C)Soakingtime(hours)SN,S00230–2354.0S0225–2301.5Upperlimit225–2301.0S1Lowerlimit240-2453.0Thechangeindiameter∆D(growthorshrinkage)foreachringisdeterminedfrom∆D=D2-D1.Thegrowth(orshrinkage)isrecordedas:∆D/D1x105(µm/100mm).Thegrowth(orshrinkage)shallnotexceedthelimitsgiveninthefollowingtable:MaximumSizeChange(µm/100mm)BearingringstabilisationGrowthShrinkageSN+10(+70)0TemperedS00+400S0+150StabilisedS1+5-153.4SurfaceaspectrequirementsAlltheheattreatedringssurfacesshallbefreefromoxide,visiblerust,carbonsoot,anyresidueofheattreatmentmediaandshallbeasuniformaspossible.Theheattreatedringsshallbefreefromsurfacedamagesuchasdents,scratches,cracksorsimilarinjuriousdefects.3.5DistortionAfterheattreatment,themeasuredringsdistortionshallbethelowestaspossible.Themaximumlimitsofovality,falseflatness,etc…shallbewithinthelimitsspecifiedontheringdrawings.Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page5/114.QUALITYASSURANCE4.1SamplingandapprovalInitialsampleshavetobesubmittedbeforeeachinitialproductiondeliverytoobtainapprovalaccordingtothepurchasingqualityassuranceprocedures.Afterapprovalofinitialsamples,nomodificationisallowedtobecarriedoutpriortoagreementbySKF.4.2Documentation/ShippedpartcertificationForcomponentssubjecttoa“documentation”demand,thespecificendcustomerrequirement(s)needtobeappliedandthesemaydependontheindustryconcerned.Asaminimum,theshippedheattreatmentbatchcertificationshallincludethefollowinginformation:•Nameofheattreatmentsubcontractor•Ringreference•Referencetothisspecification•Purchaseordernumber•Heattreatmentbatchnumber(fortraceability)•Drawingnumber/Dimensionandringtypeinformation•Steelgrade4.3TraceabilityTheheattreatmentsubcontractorshallhaveatraceablesysteminplacesuchthatstartingfromtheSKForder,totheheattreatmentbatchdelivery.Theheattreatmentinformationandtherelevantheattreatmentprocessandinspectionparametersarerecordedinaretrievablesystemforaminimumofthreeyears.4.4Deviation,RejectionandReworkAnydeviationfromthisspecificationmustbeapprovedbytheSKFlocalfactoryresponsibleMetallurgistand/orAssuranceQualitymanager.Non-conformancetothisspecificationortoanyauthoriseddeviationshallbecauseforrejection.Foranyreworkingafternonconformance,aspecificprocedureagreedbetweenSKFandthesubcontractorshallbeapplied.Inthiscase,SKFmustbeinformedbeforereworking.5.PACKAGINGANDSHIPMENTAGREEMENTEachshipmentorpackagedlotshallonlycontainonedefinedheattreatmentbatch.Apackagingagreementshallbemadebetweensupplierandpurchasertocover:•Boxmarking•Levelofrustprotection•SizeandweightofbundlingAsaminimumrequirement,theringsshallbeprotectedandpackedinsuchamannerthatensuressafedeliverytothedestinationandheattreatedringsshallbecoatedwithathinlayerofmineraloil,containingaginginhibitors,toprotectagainstcorrosion.Anyadditivesthatareusedmustnotcauseanyknownheathhazards.Theshipmentdocumentation,intheformofapackageoradvicenote,shallhaveatleastthefollowinginformation:•Nameofheattreatmentsubcontractor•Purchaseorder•Dimension/ringtype•Materialgrade•Heattreatmentbatchnumber•Referencetothisspecification•Numberofrings•WeightofdeliveryCode:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page6/11Onemetallicorplastictagshallbeattachedtoeachbundlecontaining:•Nameofheattreatmentsubcontractor•Purchaseorder•Dimension/ringtype•Materialgrade•Heattreatmentbatchnumber•Numberofrings6.SECRECYAGREEMENTWhensubcontractingisused,asecrecyagreement,basedonapurchasingdocument,shallbesignedbetweentheheattreatmentsubcontractorandSKF.Thesubcontractorshalltreatasconfidentialalltheinformationconcerningthisspecification,theprocessdevelopedandproductsconcerned."ConfidentialInformation"shallmeananyandallinformationrelatedtothespecifications,process,productrange,internalaffairsandforbusinessoftheSKFGroup-includingbutnolimitedtotechnical,practicalandcommercialinformation-thananycompanywithintheSKFGrouphasdisclosedormaydisclosedtothesubcontractordirectlyorindirectlyinwritingororally,orbysubmittingmodelsorsamples.Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page7/11ENCLOSURE1–REFERENCEMICROSTRUCTURESGLOBULARSLACKQUENCHPHASECode:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page8/11NEDDLESHAPEDSLACKQUENCHPHASECode:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page9/11MARTENSITICMICROSTRUCTURESTEMPEREDMARTENSITEMICROSTRUCTURES(SN&S00)STABILISEDMARTENSITEMICROSTRUCTURES(S0,S1…)Code:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page10/11ENCLOSURE2–TYPICALDECARBURISEDMICROSTRUCTURESCode:1.381.165GTD,GMCSt-CyrIssueNr:2Date:10/07/2013Materials&TreatmentsSpecificationsSUBCONTRACTEDHEATTREATMENTSPECIFICATIONTHROUGHMARTENSITICHARDENINGANDTEMPERINGOFDGBBRINGSCompiledCBApprovedCDSection1Edition:07/2013SKFSpecification1.381.165Page11/11ALTERATIONSFOLLOWUPEdition(yy/mm)Alterations1996/09Introduction2003/12Completereviewofthespecification2005/10AdditionofS0,S1andS2stabilityrequirements2005/11CorrectionforS0stabilizedringsretainedaustenitecontent<3%insteadof8%2008/05AdditionofS00stabilityrequirements2011/04Completereviewofthespecification2013/07HardnessconversionfromHRCtolerancesreviewedaccordingtoSKFS&PD30page252.4