【英文标准名称】:StandardTestMethodforDeterminingDecarburizationandCarburizationinHardenedandTemperedThreadedSteelBolts,ScrewsandStuds
【原文标准名称】:淬火和回火的螺纹钢螺栓、螺母和螺柱的脱碳和渗碳性测定的标准试验方法
【标准号】:ASTMF2328-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:F16.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:螺柱;脱碳;测定;回火;螺纹;淬火的;螺钉;渗碳;钢
【英文主题词】:carburization;completedecarburization;decarburization;grossdecarburization;HK;HV;Knoop;microindentation;partialdecarburization;temperedmartensite;Vickers
【摘要】:Decarburizationandcarburizationaretwosurfaceconditionscreated,eitherintentionallyorunintentionally,aswithapre-existingconditioncreatedduringtherodrollingprocess,therod/wireannealingprocess,orwhileheattreatingthreadedsteelproducts.Toomuchofeitherwilladverselyaffectthesafetyandperformanceofthethreadedproduct.Therefore,limitshavebeenestablishedforthreedifferentproductgroups:theharderandgreaterthetensilestrengthoftheproduct,themoresusceptibletofailuretheproductbecomesiftheselimitsareexceeded.Whentestingtoaparticularproductspecificationthatliststhedimensionsandmicroindentationdatatobeused,thatdatashalltakeprecedenceoverthetablesinthistestmethod.Thereareonlytwoviablemethodsavailabletodetectthesedeficiencies,eitherbythevisualmethodorthemicroindentationmethod.Bothmethodsareusedforroutineinspectionswhenevaluationsareconductedatasinglelocationontheproductsample.4.3.1Becauseanevaluationataspecificlocationmaynotberepresentativeofthewholepart,therefereemethodemploysthemicroindentationmethodtakenasanaverageofevaluationsconductedonfouradjacentthreads.Thisproceduresignificantlyreducestherandomtestvariableswhencomparedtotestingonasinglethread.Specifyingthistestmethoddoesnotspecifyorimplythattestingshallbeforeitherdecarburizationorcarburizationaloneorforbothconditions.Wheneithertestmethodisperformed,bothconditionswillbeapparentandshallbereported.Forexample,ifanorderisplacedtotestfordecarburizationandnoneisfound,butthepresenceofcarburizationisdetected,itshallbereportedonthetestreportthatcarburizationwasfound.1.1Thistestmethodcoversproceduresformeasuring,classifying,anddeterminingthepresenceofdecarburizationandcarburizationinthethreadedsectionofhardenedandtemperedinchseriessteelbolts,screws,studs,andsimilarpartswhichhavebeenheatedtofacilitatefabricationortomodifyitsmechanicalproperties.Thistestmethodisnotintendedtoaddressproductswhichareintentionallycarburizedtoachievespecificresults.1.2Tworoutinemethodsaredescribedformeasuringthelimitsofanddeterminingthepresenceofdecarburizationorcarburization-theopticalmethodandthemicroindentationmethod1.Eithermethodisappropriateforroutineexaminations.Themicroindentationmethod2shallbeconsideredtherefereemethod.1.3Forthepurposeofthesetests,therearethreeclassesofhardenedandtemperedsteelproductsforwhichspecificmeasurementsmustbemadewithrespecttotheirphysicalproperties.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:J13
【国际标准分类号】:21_060_01;77_140_20
【页数】:4P.;A4
【正文语种】: