;’SREPPUBLICOFCHINA中华人民共和国国家标准GB/T1591-2008ReplaceGB/T1591-1994HighStrengthLowAlloyStructuralSteels低合金高强度结构钢IssuedonDecember6,2008 ImplementedonOctober1,2009JointlyissuedbytheGeneralAdministrationofQualitySupervision,InspectionandQuarantineofthePeople' ,Shape,WeightandAllowableDeviation ,MarkandQualityCertificate 14ForewordThestandardGB/T1591-1994"HighStrengthLowAlloyStructuralSteels"ordancewithEN10025:2004"StructuralSteelHotRolledProducts".ThisstandardreplacesGB/T1591-1994"HighStrengthLowAlloyStructuralSteels".TherehavebeensomesignificantchangesinthisstandardoverGB/T1591-1994inthefollowingtechnicalaspects:——applicationrangeofthestandardisexpanded;——gradedintensityscalesoftheQ500,Q550,Q620andQ690areadded;andgradedintensityscaleofQ295iscancelled;——positionofthesteelproductsaremodified;andsuchharmfulelementsasphosphorusandsulfurarecontrolledmorestrictly;——calculationformulaandrequirementsofthecarbonequivalentandcracksensitivitycoefficientofthesteelproductsareadded;——deliverystateofthesteelproductsismodified;andtherequirementsofthequenchedandtemperedsteelarecancelled;——therequirementsformechanicalpropertiesandthicknessclasswidthofthesteelproductsaremodified;andloweryieldstrengthisdeterminedtotheyieldstrength;——impactabsorptionenergyvalueisimproved;——&:AngangSteelCo.,Ltd.;ChinaMetallurgicalInformationStandardizationResearchInstitute;JigangGroupCo.,Ltd.;ShougangGroup;JiangsuShagangGroupCo.,.,:LIUXuyuan,PUZhimin,WANGXiaohu,GAOLing,WANGLiping,HUANGZhengyu,ZHOUJian,
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