GBT-700-2006-碳素结构钢-EN

ICS77.140.45H40NationalstandardofthePeople'sRepublicofChinaGB/T700-2006ReplaceGB/T700-1988碳素结构钢Carbonstructuralsteels(ISO630:1995,Structuralsteels–Plates,wideflats,bars,sectionsandprofiles,NEQ)Issuedate:Nov1,2006Implementationdate:Feb1,2007Issuedby:GeneralAdministrationofQualitySupervision,InspectionandQuarantineofthePeople’sRepublicofChinaStandardizationAdministrationofthePeople'sRepublicofChina(SAC)ForewordThisstandardisnotequivalenttoISO630:1995StructuralSteelsintherespectofconsistency.Themaindifferencesbetweenthetwostandardsareasfollows:-Nogradesarespecifiedcorrespondingtotheyieldstrengthlevelsof185N/mm2and355N/mm2;-GradesQ195andQ215arespecifiedcorrespondingtolevels195N/mm2and215N/mm2;-ThephosphoruscontentsofclassAsteelsofQ235andQ275aredecreasedby0.005%;ThethicknessofQ235classBsteelisdividedintotwolevelsaccordingtothedeoxidizationmethodandthecarboncontentis0.20%inbothlevels;-Q235classBsteelofwhichthethicknessissmallerthan25mmmaynotbesubjecttotestwiththeconsentofthebuyerifthesuppliercanensurethattheimpactabsorbedenergyisuptostandard;-TheyieldstrengthofQ275steelofwhichthethicknessisbiggerthan80mm~100mmisincreasedby10N/mm2;-Coldbendingtestisadded;-DetailedbatchingrulesarespecifiedaccordingtothesituationofChina.ThisstandardreplacesGB/T700-1988CarbonStructuralSteelsandhasthefollowingchangesincomparisonwithGB/T700-1988:-Semi-killedsteeliscancelledin“deoxidizationmethod”;-GradesQ255andQ275inGB/T700-1988arecancelled;-GradeE275inISO630:1995isnewlyaddedandchangedtothenewgradeQ275;-Thelowerlimitsofcarbonandmanganesecontentsofeachgradearecancelled,andtheupperlimitofmanganesecontentisincreased;-Thelimitofsiliconcontentofrimmedsteelandkilledsteeliscancelled;-siliconcontentischangedfrom0.30%to0.35%(exceptforQ195);-ThephosphorusandsulphurcontentsofgradeQ195aredecreasedrespectivelyfrom0.045%and0.050%to0.035%and0.040%;-Theregulationfortheelongationafterfractureofthethickness(ordiameter)levelofnotbiggerthan16mmiscancelled;-“Theupperlimitofthetensilestrengthofwidestripsteel(includingshearedsteelplate)isnotusedasatermofdelivery”and“Q235classBsteelofwhichthethicknessissmallerthan25mmmaynotbesubjecttotestwiththeconsentofthebuyerifthesuppliercanensurethattheimpactabsorbedenergyisuptostandard”areaddedinthefootnotesofTable2;-Theregulationforthenitrogencontentinthesteelismodified;-Theregulationforimpacttestismodifiedandthefigureoftheminimumimpactabsorbedenergyofthesamplesofwhichthethicknessis5mm-10mmisadded;-Thebasisofbatchingischangedfrom“thesamefurnaceandkettlenumber”to“thesamefurnacenumber”andthelimitationforthefurnacenumberofmixedbatchiscancelled.AnnexAofthisstandardisnormative.ThisstandardwasproposedbyChinaIronandSteelAssociation.ThisstandardisunderthejurisdictionofNationalTechnicalCommitteeforSteelStandardization.ThisstandardwasdraftedbyChinaMetallurgicalInformation&StandardizationInstitute,CapitalIronandSteelCompany,HandanIron&SteelGroupandBenxiIron&SteelGroupCo.,Ltd.ThemaindraftersofthisstandardareTangYifan,LuanYan,WangLiping,SunPing,ZhangXianfengandDaiQiang.ThisstandardwasfirstissuedinJanuary1965,firstrevisedinOctober1979andrevisedforthesecondtimeinJune1988.Carbonstructuralsteels1ScopeThisstandardspecifiesthegrade,dimension,shape,weightandpermissibledeviation,technicalrequirements,testmethods,inspectionrules,packing,markingandqualitycertificateofcarbonstructuralsteel.Thisstandardisapplicabletothestructuralhotrolledsteelsheets,steelstrips,sectionalsteelsandbarsteelsgenerallyusedforwelding,rivetingandboltingengineeringindeliverystate.Thechemicalcompositionspecifiedbythisstandardisalsoapplicabletosteelingots,continuouscastingbillets,steelbilletsandtheirproducts.2NormativereferencesThefollowingnormativedocumentscontainprovisionswhich,throughreferenceinthistext，constituteprovisionsofthisstandard.Fordatedreferences,subsequentamendments(notincludingcorrections)to,orrevisionsof,anyofthesepublicationsdonotapply.Howeverpartiestoagreementsbasedonthisstandardareencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.Forundatedreferences,thelatesteditionofthenormativedocumentreferredtoapplies.GB/T222-2006PermissibletolerancesforchemicalcompositionofsteelproductsGB/T223.3Methodsforchemicalanalysisofiron,steelandalloy--ThediantipyrylmethanephosphomolybdategravimetricmethodforthedeterminationofphosphoruscontentGB/T223.10Methodsforchemicalanalysisofiron,steelandalloy--Thecupferronseparation-chromeazurolSphotometricmethodforthedeterminationofaluminumcontentGB/T223.11Methodsforchemicalanalysisofiron,steelandalloy--TheammoniumpersulfateoxidationvolumetricmethodforthedeterminationofchromiumcontentGB/T223.18Methodsforchemicalanalysisofiron,steelandalloy--ThesodiumthiosulfateseparationiodimetricmethodforthedeterminationofcoppercontentGB/T223.19Methodsforchemicalanalysisofiron,steelandalloy--Theneocuproine-chloroformextractionphotometricmethodforthedeterminationofcoppercontentGB/T223.24Methodsforchemicalanalysisofiron,steelandalloy--Theextractionseparation-dimethylglyoximespectrophotometricmetho