gost9454-78-ENG(冲击)

STATESTANDARDOFTHEUNIONOFSSRMETALSTESTMETHODFORIMPACTBENDATLOWER,AMBIENTANDHIGHERTEMPERATURESGOST9454-78(STSEV472-77,STSEV473-771)NATIONALSTANDARDSBOARDOFTHEUSSRMoscowSTATESTANDARDOFTHEUNIONOFSSRMETALSTestmethodforimpactbendatlower,ambientandhighertemperaturesGOST9454-78(STSEV472-77,STSEV473-77)Sostitutes:GOST9454-60,GOST9455-60&GOST9456-60ByResolutionofNationalStandardsBoardunderCouncilofMinistersoftheUSSRN.1021dd.April17th,1978,validfrom01/01/1979forsampletestwithconcentratortypeT(par.1.1)01/01/198201/01/1989AmendmentN.1GOST9454-78Metals.Testmethodforimpactbendatlower,ambientandhighertemperaturesByResolutionofNationalStandardsBoardunderCouncilofMinistersoftheUSSRN.4575dd.14/10/1981,validfrom01/01/1982AmendmentN.2GOST9454-78Metals.Testmethodforimpactbendatlower,ambientandhighertemperaturesApprovedandgiveneffecttobyResolutionofNationalStandardsBoardoftheUSSRN.521dd.11/03/1988validfrom01/09/1988Thepresentstandardcoversferrousandnon-ferrousmetalsandalloys,anddeterminestestmethodforimpactbendatminus100toplus1200°С.(Amendedversion,Rev.#2.)Saidmethodisbasedonsamplefracturewithcenteredconcentratorbyasinglependulummachineimpact.Sampleendsarepositionedonthesupports.Testresultsdeterminesfullworkapplied(impactwork),Кorimpactstrength.(Amendedversion,Rev.#1.)Impactstrengthisintendedimpactworkreferredtotheoriginalsamplecross-sectionareaatconcentratorpoint.Standardmeetscomplete;STSEV472-77,STSEV473-77,ISO83-1976&ISO148-1983.(Amendedversion,Rev.#2.)1.SAMPLINGMETHOD1.1.TestsampleshapeanddimensionmeetthevaluesinTablebelowanddrawing1-3.Dimensions,mmConcentratortypeConcentratorradiusRSampletypeLengthL(dev.±0,6)WidthВHeightН(dev.±0,1)Cutdepthh1(dev.±0,1)Concentratordepthh(dev.±0,6)NetsectionheightH1108±0,186±0,17±0,1U1±0,07*123456789106510±0,107,5±0,105±0,052±0,0510±0,107,5±0,105±0,0510±0,107,5±0,105±0,0510--5±0,110±0,107,5±0,105±0,0510--8±0,05*V0,25±0,02511121314552±0,0586±0,05115510±0,107,5±0,105±0,052±0,0591,53,0TCrack161718192114025±0,102510,012,0-*Trialbulktestsadmitsampleswithmax.dev.±0,10mm(Amendedversion,Rev.#2.)sampleswithoutcutandwithoneortworoughsurfacesareadmitted,butthevaluesofsurfacesareotherthaninTable.ApplicationofsamplesisspecifiedinAnnex1.Testofsamples4,14,18perclient’srequestforspecial-purposeproducts.(Amendedversion,Rev.#2.)1.2.Cutpointofthebilletforsamplefabrication,concentratorcenter,billetcuttingprocessandsamplefabrications:GOST7565-74forferrousmetalsifotherwisenotspecifiedintechnicalnormativedocumentationforspecifiedproducts.Fornon-ferrousmetalsandalloysit’sspecifiedintechnicalnormativedocumentationfortheproducts.Inbilletcutting,protectsamplemetaloffhardeningandheatingthataltermetalpropertiesifotherwisenotspecifiedintechnicalnormativedocumentationforspecifiedproducts.(Amendedversion,Rev.#1,2.)SamplewithUconcentratorFig.1SamplewithUconcentratorFig.2SamplewithТconcentrator(fatiguecrack)а-overview;б-concentrateshapeforsampletype15through19;в-concentrateshapeforsamplestype20Fig.31.3.MarksonU&Vconcentratorsurface,seenwithoutmagnifierarenotadmitted.1.4.Tconcentratorisachievedattheinitialcuttingtopforplanecyclicsamplebend.Anymethodisadmittedforinitialconcentrator.(Amendedversion,Rev.#1,2.)1.5.Max.residualdeflectionuponapplyingTconcentrateonsamplesisNMT0,25mmforsamplesof55mmlength.MeasuresampledeflectionbyusingtimerindicatorasperGOST577-68orsimilar,ofaccuracywhilemeasuringthedeflectionNMT0,05mmwithreferencetosamplelength.(Amendedversion,Rev.#1,2.)1.6.sampletypeandnumber,reproducibletestsarespecifiedintechnicalnormativedocumentationforspecifiedproductsapprovedaccordingtoestablishedprocedure.Testsamplestype1through01.01.91ifotherwisenotspecifiedintechnicalnormativedocumentationformetalproducts.(Amendedversion,Rev.#1,2.)2.APPARATUSANDMATERIALS2.1.PendulummachinesGOST10707-82.Pendulumspeedatimpactisasbelow:5±0,5m/s-forimpactmachinesofnominalpendulumpotentialenergy50,0(5,0);150(15);300(30)J(kgf-m);4±0,25m/s-forimpactmachinesofnominalpendulumpotentialenergy25(2,5);15(1,5);4,5(0,75)J(kgf-m);3±0,25m/s-forimpactmachinesofnominalpendulumpotentialenergy5,0(0,5)J(kgf-m).Impactmachinesofothernominalpotentialenergyareadmitted.ProvidedsaidnominalpotentialenergypfpendulumcorrespondstoimpactworkNLT10%ofnominalvalueofpendulumpotentialenergy.Impactmachineswithpendulumnominalpotentialenergyto01.01.91providedimpactworkbeNLT5%ofnominalvalueofpendulumpotentialenergy.Nominalvalueofpendulumpotentialenergyisspecifiedintechnicalnormativedocumentationforspecifiedproducts.Basicsupportandbladedimensionsofthependulumcorrespondtodrawing4.Impactmachinesofotherconstructionadmitdifferentbendingradiusandpendulumstep:4,5to7,0m/s.(Amendedversion,Rev.#1,2.)2.2.Thermostatforuniformcoolingorheating,lackofaggressiveeffectoftheambientuponthesampleandtemperaturecontrol.2.3.Mixtureofliquidnitrogen(GOST9293-74)orcarbonicacidsnow(dryice)andethanol.Liquidoxygenorliquidairasacoolantisnotadmitted.(Amendedversion,Rev.#1,2.)OxygenmassconcentrationinliquidnitrogenduringsamplecoolinginthermostatisNMT10%.2.4.ThermometersofNM±1°Сaccuracyforcoolingmediatemperaturecon