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1、1PrefaceModifythisstandardbyEN10219.12006"finegraincarbonsteelandcoldformedweldedsteelstructuralhollowsectionsofPart1:Technicaldeliveryconditions",themaindifferencesareasfollows:---Ofsteelgradesandgradesaccordingtothecorrespondingstandardsandgrades;---Sampling,testingmethods,re-inspect
2、ionoftherelevantrules,accordingtonationalstandards.ThisstandardreplacesGB/T6725-2002"cold-formedsteel."Therevisionofthestandardcontentofthefollowingtechniquesweremodified:---Adjustednormativereferences;---Increaseproductyieldstrengthclassification;---Increasethefine-grainedsteel;---Inc
3、reasethemechanicalpropertiesoftheproductspecificassessmenttargets.AppendixAofthisstandardfortheinformativeappendix.ThestandardproposedbytheChinaIronandSteelAssociation.ThisstandardisstandardizedbytheNationalSteelTechnicalCommittee.Thedraftingofthisstandard:ShanghaiBaosteelConstructionD
4、esignandResearchInstitute,WuhanIronandSteelGroupHankouRollingMill,SteelPlantCo.,Ltd.,Guangzhou,FoshanCity,ChiofSteelPipeManufacturingCo.,Ltd.,ShanghaiJiayiCold-FormedSteel.Maindraftersofthisstandard:YuMATRIX,Qian,theMayueFeng,Xiu-FangZhang,LiYe,ZhangYongqi,LiJianzhang,ZhangJing.Thissta
5、ndardreplacesthepreviouslyissuedstandardis:---GB/T6725-1986,GB/T6725-1992,GB/T6725-2002.1.ScopeThisstandardspecifiesthecontentofcold-formedsteelordering,classificationandcodename,size,shape,weightandtolerance,technicalrequirements,testmethods,inspectionrules,packaging,markingandquality
6、certification.Thisstandardappliestocoldrolledorhotrolleddeformedsteelsheetandstripinacontinuousrollerbendingmachineontheproductionofcold-formedsteel.2.ReferenceStandardThetermsofthefollowingdocumentsbythestandardreferenceintheprovisionsofthisstandard.Fordatedreferences,subsequentamendm
7、ents(excludingcorrections)orrevisionsdonotapplytothisstandard,however,encouragethepartiestoreachanagreementbasedonthisstandardtostudywhetherthelatestversionofthesedocuments.Forundatedreferences,thelatestversionappliestothisstandard.ChemicalcompositionofsteelproductsGB/T222ToleranceGB
