文档介绍：NationalStandardofthePeople’sRepublicofChinaGB/T699-1999QualityCarbonStructuralSteelsIssuedate:1999-11-01Implementationdate:2000-08-01IssuedbyStateBureauofQualityandTechnicalSupervisionForewordThisstandardhasrevisedGB/T699-1988“Qualitycarbonstructuresteel-Technicalrequirements”.Thisstandardhasrevisedthefollowingtechnicalcontents:Amendsthenameofthestandard,whichchangedto“Qualitycarbonstructuralsteels”;Expandsthescopetothequalitycarbonstructuralsteelswhichcanprovidethediameterorthethicknessismorethan250mm;Increasesthechapterof“Ordercontent”;Thedimension,ordancewiththeprovisionsofGB/T702-B/T908-1987;Increasestheunifiednumberingsystemforthemarkercodesandtrademarksofthesteelproducts;%;Thephosphorus,sulfurcontentandmacrostructureofthesteelsaredividedintothreegradesbymetallurgicalquality;ingstate,ifthesupplyingpartycanguaranteethemechanicalperformance,thesteelscannotbeinspected;Inthenote2ofthetable3,,“watercooling”to“oilcooling”;Cancelstheinspectionitemof“fracture”;Cancelsthequalifiedgradeofthenon--1988“Qualitycarbonstructuresteel-Technicalrequirements”:ChinaMetallurgicalInformationandStandardizationResearchInstitute,ChongqingSpecialSteelCo.,Ltd.,ShanghaiPudongIronandSteel(Group)Co.,Ltd.,DayeSpecialSteelCo.,Ltd.,andHandanIron&SteelCo.,Ltd..Majordraftman:LuanYan,TangYifan,TangZhibai,ChenChangxi,SunPing,TengChangling,,1965andthefirstrevisionwasissuedinFebruary,’sRepublicofChinaGB/T699-1999QualityCarbonStructuralSteelsReplaceGB/T699-1988ScopeThisstandardspecifiesthedimension,shape,weightandthetolerance,technicalrequirements,testmethods,restrules,packaging,