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1、本英文版为内部资料，仅供参考，以中文版为准。TheChineseversionofstandardshasprecedencetotheirEnglishtranslationswhichareonlyforinternalreference.JB4726–2000压力容器用碳素钢和低合金钢锻件CarbonandLow-alloySteelForgingsforPressureVessels—1—PrefaceThisstandardistherevisedversionofJB4726–1994.
2、ThisstandardhasmadefollowingchangesbasedonthecommentsobtainedsincetheimplementationofJB4726–1994,thedomesticdevelopmentofnewsteelgradeandreferenceoftherecentinternationalsimilarstandards:115MnV,currentlynotused,hasbeencanceled;2Moderatetemperatehydroge
3、nresistantsteel14CrlMohasbeenadded;3Phosphorusandsulfurcontentshavebeendecreasedwidelybasedonthedomesticadvancedsmeltinglevelsoastoreachtheinternationaladvancedlevel;40℃impacttestshallbeusedfor16Mn,20MnMo,20MnMoNbforgingsinsteadof20℃impacttest,soastome
4、ettherequirementofpressurevesselproductstandard;5ConsideringthesafetyofpressurevesselsstipulationsinappendixBhavebeenaddedforeachsteelgradeinthisstandard,JB4726–1994shallbenullsincetheimplementationdateofthisstandard.AppendixAandAppendixBofthisstandard
5、arethestandardappendixes.ThisstandardisputforthbyTheNationalPressureVesselsStandardizationandTechnicalCommittee.ThisstandardbelongsbyrighttotheManufacturingSub-committeeoftheNationalPressureVesselStandardizationandTechnicalCommittee.Responsibledrafting
6、unitofthisstandard:HefeiGeneralMachineryResearchInstitute,ChinaGeneralMachineryandEngineeringCompany,WuhanHeavy-dutyCastingandForgingWorks.Maindraftersofthisstandard:ZhangYong,QinXiaozhong,XuJie,TengMingde,YanMingxin,LiRongrong.Thisstandardhasbeenfirst
7、issuedinJanuary1994.—2—标准分享网www.bzfxw.com免费下载中华人民共和国行业标准IndustrialStandardofthePeople’sRepublicofChinaJB4726–2000压力容器用碳素钢和低合金钢锻件InsubstitutionofJB4726–1994CarbonandLow-alloySteelForgingsforPressureVessels1.ScopeThisstandardhasspecifiedthetechnicalrequi
8、rements,testmethodsandinspectionrules,etc.forcarbonandlow-alloysteelforgingsforpressurevessels.Thisstandardisapplicabletocarbonandlow-alloysteelforgingsforpressurevesselswithadesigntemperatureabove–20℃,designpressurebelow35Mpa.www.bzfxw
