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1、GB/T699-1999.NationalStandardofthePeople’sRepublicofChinaGB/T699-1999QualityCarbonStructuralSteelsIssuedate:1999-11-01Implementationdate:2000-08-01GB/T699-1999IssuedbyStateBureauofQualityandTechnicalSupervisionGB/T699-1999ForewordThisstandardhasrevisedGB/T699-1988“Qualitycarbonstructuresteel-T
2、echnicalrequirements”.Thisstandardhasrevisedthefollowingtechnicalcontents:-Amendsthenameofthestandard,whichchangedto“Qualitycarbonstructuralsteels”;-Expandsthescopetothequalitycarbonstructuralsteelswhichcanprovidethediameterorthethicknessismorethan250mm;-Increasesthechapterof“Ordercontent”;-Th
3、edimension,shapeandthetoleranceofthesteelsshallbeinaccordancewiththeprovisionsofGB/T702-1986orGB/T908-1987;-Increasestheunifiednumberingsystemforthemarkercodesandtrademarksofthesteelproducts;-ThecarboncontentofthesteelproductswhosetrademarkisbelowNo.40reducesby0.01%;-Thephosphorus,sulfurconten
4、tandmacrostructureofthesteelsaredividedintothreegradesbymetallurgicalquality;-Forthesteelswhichdeliveryunderthehotrollingorhotforgingstate,ifthesupplyingpartycanguaranteethemechanicalperformance,thesteelscannotbeinspected;-Inthenote2ofthetable3,changesthequenchingmediumofNo.75,No.80andNo.85ste
5、elsfrom“watercooling”to“oilcooling”;-Cancelstheinspectionitemof“fracture”;-Cancelsthequalifiedgradeofthenon-metallicinclusions.ThisstandardwillreplaceGB/T699-1988“Qualitycarbonstructuresteel-Technicalrequirements”sinceitsimplementation.ThisstandardwasproposedbyStateBureauofMetallurgicalIndustr
6、y.ThisstandardisunderthejurisdictionofNationalsteelstandardizationtechnicalcommittee.Themajordraftingunitsofthisstandardare:ChinaMetallurgicalInformationandStandardizationResearchInstitute,ChongqingSpecialSteelCo.,Ltd.,ShanghaiPudongIronandSteel(Group)Co.,Ltd.,DayeSpecialSteelCo.,Ltd.,andHanda
7、nIron&SteelCo.,Ltd..Majordraftman:LuanYan,TangYifan,TangZhibai,ChenChangxi,SunPing,TengChangling,andZhaoGuanxin.ThisstandardwasfirstlyissuedinJanuary,1965andthefirstrevisionwasissuedinFebruary,1988.GB/T699-1999NationalStandardofthePeopl