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1、INTERNATIONALSTARDINTERNATIONALGANIZATION~0i7STANOARD~ZATION.MEX~YHAPO~HARoprAtiki3~qWino~AH~A~T~~AUAA.~ROAN~SATION~NTERNATIONALEDENMALISAT~ONSteelDeterminationofeffectivedepthofhardeningafterflameinductionhardeningAcier

2、Db)specifiesthemethodfmeasuringthisdepthofhardening.2FIELDOFAPPLICATIONThisInternationalStardappliestoa)hardenedlayerswithadepthgreaterthan0.3mmb)partswhichinthesurfacehardenedconditionhaveatadistance3xDSfromthesurfaceah

3、ardnesslessthanhardnesslimit(HV)100Wheretheseconditionsarenotsatisfiedtheeffectivedepthofhardnessafterflameinductionhardeningshallbedefinedbyagreementbetweenthepartiesconcerned.Fsteelswherethehardnessofapartatadistance3D

4、Sfromthesurfaceisabovehardnesslimit(HV)100thecriterionmaystillbeusedonconditionthatahigherhardnesslimitischosenftheassessmentoftheeffectivedepthofhardening(seeclause3).3DEFINITIONeffectivedepthofhardeningafterflameinduct

5、ionhardening(DS):ThedistancebetweenthesurfaceoftheproductthelayerwheretheVickershardness(HV)underaloadof98N(1kgf)l)isequaltothevaluespecifiedbytheterm“hardnesslimit”.2)Itisafunctionoftheminimumsurfacehardnessrequiredfthe

6、partgivenbythefollowingequation:hardnesslimit(HV)=080xminimumsurfacehardness(HV)Theeffectivedepthofhardeningafterflameinductionhardeningisdesignatedbytheletters“DS”.Thisdepthisexpressedinmillimetresisapplicabletotheareas

7、pecifiedinthedrawingofthepartwhichmaymaynothavebeengrounddependinguponthespecification.4MEASUREMENT4.1CasesofdisputeThemethodofmeasurementoftheeffectivedepthofhardeningafterflameinductionhardeningspecifiedinthisclausesha

8、llbetheonlyoneapplicableincasesofdispute.4.2PrincipleofthemeasurementTheeffectivedepthofhardeningshallbedeterminedfromthegradientofhardnessinacrosssectionnmaltothesurface.Itshallbeestimatedgraphicallyonthecurverepresenti

9、ngthehardnessasafunctionofthedistancefromthesurfaceofthepart.4.3MeasuringprocedureThemeasurementshallbecarriedoutunlessotherwiseagreedbetweenthepartiesconcernedonacrosssectionofthepartinthehardenedcondition.4.3.1Preparat

10、ionofthesurfacetobeexaminedThesurfaceonwhichthemeasurementistobemadeshallbepolishedsoastopermitthecrectmeasurementofthesizeofthehardnessimpressions.Everyprecautionshallbetakentoavoidroundingtheedgesofthissurfaceoverheati

11、ngthepart.1)Byagreementbetweenthepartiesconcernedloadsdifferentfromthereferenceload9.8N(1kgf)withintherange5to50Nmaybeused.ByagreementbetweenthepartiesconcernedthesuperficialRockwellmethodfmeasuringthehardnessmaybeusedin

12、whichcasethehardnesslimitvalueshouldbespecified.2)Byagreementbetweenthepartiesconcernedothervaluesofthehardnesslimitmaybeused.Theeffectivedepthshouldthenbedesignatedbytheuseofasuffixtotheletters“DS”.1CopyrightInternation

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