JB 4726-2000 英文版 压力容器用碳素钢和低合金钢锻件

1JB4726–2000CarbonandLow-alloySteelForgingsforPressureVesselsTheChineseversionofstandardshasprecedencetotheirEnglishtranslationswhichareonlyforinternalreference.2PrefaceThisstandardistherevisedversionofJB4726–1994.ThisstandardhasmadefollowingchangesbasedonthecommentsobtainedsincetheimplementationofJB4726–1994,thedomesticdevelopmentofnewsteelgradeandreferenceoftherecentinternationalsimilarstandards:115MnV,currentlynotused,hasbeencanceled;2Moderatetemperatehydrogenresistantsteel14CrlMohasbeenadded;3Phosphorusandsulfurcontentshavebeendecreasedwidelybasedonthedomesticadvancedsmeltinglevelsoastoreachtheinternationaladvancedlevel;40impacttestshallbeusedfor16Mn,20MnMo,20MnMoNbforgingsinsteadof20impacttest,soastomeettherequirementofpressurevesselproductstandard;5ConsideringthesafetyofpressurevesselsstipulationsinappendixBhavebeenaddedforeachsteelgradeinthisstandard,JB4726–1994shallbenullsincetheimplementationdateofthisstandard.AppendixAandAppendixBofthisstandardarethestandardappendixes.ThisstandardisputforthbyTheNationalPressureVesselsStandardizationandTechnicalCommittee.ThisstandardbelongsbyrighttotheManufacturingSub-committeeoftheNationalPressureVesselStandardizationandTechnicalCommittee.Responsibledraftingunitofthisstandard:HefeiGeneralMachineryResearchInstitute,ChinaGeneralMachineryandEngineeringCompany,WuhanHeavy-dutyCastingandForgingWorks.Maindraftersofthisstandard:ZhangYong,QinXiaozhong,XuJie,TengMingde,YanMingxin,LiRongrong.ThisstandardhasbeenfirstissuedinJanuary1994.3IndustrialStandardofthePeople’sRepublicofChinaCarbonandLow-alloySteelForgingsforPressureVesselsJB4726–2000InsubstitutionofJB4726–19941.ScopeThisstandardhasspecifiedthetechnicalrequirements,testmethodsandinspectionrules,etc.forcarbonandlow-alloysteelforgingsforpressurevessels.Thisstandardisapplicabletocarbonandlow-alloysteelforgingsforpressurevesselswithadesigntemperatureabove–20,designpressurebelow35Mpa.2ReferencestandardsThearticlescontainedinthestandardsbelowshallbecomepartofthisstandardbyreferencehereof.Theindicatedversionsareeffectiveatthetimeofissuanceofthisstandard.Allstandardsaresubjecttorevision.Therefore,thepossibilityofusingthelatestversionofthestandardsbelowshallbediscussedbytheusersofthisstandard.GB/T222–1984MethodofsamplingsteelfordeterminationofchemicalcompositionandpermissiblevariationsforproductanalysisGB/T223.5–1997Methodsforchemicalanalysisofiron,steelandalloy–Thereducedmolybdosilicatespectro-photometricmethodforthedeterminationofacid-solublesiliconcontentGB/T223.11–1991Methodsforchemicalanalysisofiron,steelandalloy–TheammoniumpersulphateoxidationvolumetricmethodforthedeterminationofchromiumcontentApprovedbyTheStateMachineryIndustrialBureauTheNationalPetrochemicalIndustrialBureau2000-04-24on24-04-20002000-09-30Implementedfrom30-09-20004GB/T223.14–1989Methodsforchemicalanalysisofiron,steelandalloy–TheN-benzoyl-N-phenylhydroxylamineextractphotometricmethodforthedeterminationofvanadiumcontentGB/T223.26–1989Methodsforchemicalanalysisofiron,steelandalloy–ThethiocyanatedirectphotometricmethodforthedeterminationofmolybdenumcontentGB/T223.39–1994Methodsforchemicalanalysisofiron,steelandalloy–ThesulphochlorophenolSphotometricmethodforthedeterminationofniobiumcontentGB/T223.59–1987Methodsforchemicalanalysisofiron,steelandalloy–Thesodiumarsenite-sodiumnitritetitrimetricmethodforthedeterminationofphosphoruscontentGB/T223.60–1997Methodsforchemicalanalysisofiron,steelandalloy–TheperchloricaciddehydrationgravimetricmethodforthedeterminationofsiliconcontentGB/T223.62–1988Methodsforchemicalanalysisofiron,steelandalloy–ThebutylacetateextractionphotometricmethodforthedeterminationofphosphoruscontentGB/T223.63–1988Methodsforchemicalanalysisofiron,steelandalloy–Thesodium(potassium)periodatephotometricmethodforthedeterminationofmanganesecontentGB/T223.68–1997Methodsforchemicalanalysisofiron,steelandalloy–ThepotassiumiodatetitrationmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontentGB/T223.69–1997Methodsforchemicalanalysisofiron,steelandalloy–Thegas-volumetricmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontentGB/T223.71–1997Methodsforchemicalanalysisofiron,steelandalloy–ThegravimetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontentGB/T228–1987Metallicmaterials–methodfortensiletestingGB/T229–1994Metallicmaterials–methodforCharpynotchimpacttestGB/T231–1984Metallicmaterials–BrinellhardnesstestGB/T4338–1995Metallicmaterials–TensiletestingatelevatedtemperatureGB/T6397–1986Metallicmaterials–TestpiecefortensiletestingGB/T10561–1989Steel–Determinationofcontentofnon-metallicinclusion–Micrographicmethodusingstandarddiagrams5JB4708–2000WeldingprocessevaluationforsteelpressurevesselsJB4730–1994Non-distractiveexaminationofpressurevesselsYB/T5148–1993Metallicmaterials-Methodsfordeterminationofaveragegrainsize3TerminologiesThisstandardusesthefollowingdefinitions.3.1CylindricalforgingAxisymmetricalhollowforging,whoseaxiallengthLisgreaterthanitsouterdiameterD,asshowninFig.1a).tshallbethenominalthickness