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GBT700-88 carbon structure steels.pdf

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GBT700-88 carbon structure steels.pdf

ApprovedbyChinaStateBureauofQualityandTechnicalSupervisiononJune1st1988EffectiveonOctober1st1988Page1of8NationalStandardofthePeoplesRepublicofChinaUDC669.14.018.29GB70088SubstituteforGB70079CarbonStructuralSteelsThisstandardisreferencedtoISO630StructuralSteel.1ContentsandApplicabilityThisstandardspecifiesthetechnicalconditionsforcarbonstructuralsteels.Thisstandardisintendedforgeneralstructuralsteelsandhotrolledsteelplates,strips,sectionsteelandsteelbarsforengineeringpurpose.Theseproductscanbeusedascomponentsforwelding,rivetingandboltingandnormallyusedindeliveryconditions.Thechemicalcompositionsdefinedinthestandardareapplicabletothesteelingotsincludingcontinuouscastingbillets,billetsandtheirproducts.2NormativeReferencesGB222MethodofsamplingsteelfordeterminationofchemicalcompositionandpermissibledeviationsforproductanalysisGB223Methodsforchemicalanalysisofiron,steelandalloyGB228MetallicmaterialsTensiletestingGB232MetallicmaterialsBendtestGB247Generalruleofacceptance,package,markandcertificationforsteelplatessheetsandstripsGB2101Generalrequirementsofacceptance,packaging,markingandcertificationforsectionsteelGB2106MetallicmaterialsCharpyimpacttestVnotchGB2975LocationandpreparationoftestpiecesformechanicalandtechnologicaltestingGB4159MetallicmaterialsCharpyimpacttestatlowtemperatureGB6397MetallicmaterialsTestpiecesfortensiletesting3DenominationofDesignationandSymbols3.1DenominationofDesignationThedesignationofsteelconsistsofaletterstandingfortheyieldpoint,yieldingstrength,asymbolforqualitygradeandasymbolfordeoxidationmethod.ForexampleQ235AFGB70088Page2of83.2SymbolsQThefirstletterforpinyinofChinesecharacterQu,representingyieldpointofsteelsA,B,C,DDifferentqualitygradesofsteelsFThefirstletterforpinyinofChinesecharacterFei,representingrimmedsteelbThefirstletterforpinyinofChinesecharacterban,representingsemikilledsteelZThefirstletterforpinyinofChinesecharacterZhen,representingkilledsteelTZThefirsttwolettersforpinyinofChinesecharactersTeZhen,representingspecialkilledsteelIndenominationofdesignationcomposition,ZandTZareomitted.4Dimension,Shape,WeightandPermissibleDeviationsThedimension,shape,weightandpermissibledeviationsforsteelsshallbeinaccordancewiththeprovisionsinrelevantstandards.5TechnicalRequirements5.1DesignationsandChemicalComposition5.1.1ThedesignationsandchemicalcompositionheatanalysisforsteelsshallbeinaccordancewiththeprovisionssetforthinTable1.Table1DesignationQualityGradeChemicalComposition,DeoxidationMethodCMnSiSPNotmorethanQ195É0.060.120.250.500.300.0500.045F,b,ZQ215A0.090.150.250.550.300.0500.045F,b,ZB0.045Q235A0.140.220.300.6510.300.0500.045F,b,ZB0.120.200.300.7010.045Cd0.180.350.800.0400.040ZDd0.170.0350.035TZQ255A0.180.280.400.700.300.0500.045F,b,ZB0.045Q275É0.280.380.500.800.350.0500.045b,ZNote1ForQ235AandBrimmedsteel,theupperlimitofMncontentis0.60.5.1.1.1TheSicontentshallnotbegreaterthan0.07forrimmedsteelandnotgreaterthan0.17forsemikilledsteel.ThelowerlimitofSicontentinthekilledsteelis0.12.5.1.1.2ThesteelgradeDshallcontainsufficientelementsthatformfinegainstructure.ForGB70088Page3of8example,theacidsolublealuminuminthesteelshallnotbelessthan0.015ortotalaluminumcontentshallnotbelessthan0.020.5.1.1.3ThecontentofresidualelementssuchasCr,NiandCuinthesteelshallnotbegreaterthan0.30respectively.Thenitrogencontentinthesteelsmeltedinoxygenconvertershallnotbegreaterthan0.008.Theanalysismaybeexemptedifthemanufacturercanguaranteethecomplianceofthesteel.Asagreedbythepurchaser,itisacceptablethatCucontentinthesteelgradeAisnotmorethan0.35.Inthiscase,thepurchasershallanalyzeCucontentandindicateitinthequalitycertificate.5.1.1.4Theresidualcontentofarsenicinthesteelshallnotbegreaterthan0.080.Forsteelsmadebypigironsmeltedbyarseniccontainingore,thearseniccontentshallbeagreeduponbythemanufacturerandthepurchaser.Iftherawmaterialdoesntcontainarsenic,theanalysisofarseniccontentinthesteelcanbeexempted.5.1.1.5Ifthemechanicalpropertiesofsteelsareensuredtobeinaccordancewiththeprovisionsofthisstandard,theC,SiandMncontentforgradeAsteelofvariousdesignationsandlowerlimitofCandMncontentfortheothergradesofvariousdesignationsmaynotbedeemedasadeliverycondition.However,thecontentoftheseelementsheatanalysisshallbestatedinthequalitycertificate.5.1.1.6Whilesupplyingsteelingotsincludingcontinuouscastingbilletsandbillets,themanufacturershallassurethechemicalcompositionheatanalysistocomplywiththeprovisionssetforthinTable1.However,toensurethepropertiesofrolledsteelstomeettherequirementofthisstandard,thechemicalcompositionforsteelgradeAandBcanbesubjecttoproperadjustmentasrequiredbythepurchaserandseparateagreementshallbesigned.5.1.2ThepermissibledeviationsforchemicalcompositionofproductsteelsandcommercialbilletsshallbeinaccordancewiththeprovisionssetforthinTable1ofGB222.Norequirementsaremadeonthepermissibledeviationsforchemicalcompositionofproductsteelsandcommercialbilletsforskilledsteels.5.2SmeltingProcessThesteelsshallbesmeltedintheoxygenconverter,openhearthorelectricfurnace.Unlessotherwiserequestedbythepurchaserandspecifiedinthecontract,theselectingofmeltingprocessshallbelefttothediscretionofthemanufacturer.5.3DeliveryConditionsNormally,thesteelsaredeliveredinhotrolledincludingcontrolledrolledcondition.Ifrequestedbythepurchaserandagreedbybothparties,thesteelcanbedeliveredinnormalizedstatewiththeexceptionofsteelgradeA.5.4MechanicalProperties5.4.1TheresultsoftensiletestandimpacttestshallbeinaccordancewiththeprovisionsGB70088Page4of8setforthinTable2.TheresultsofbendtestshallbeinaccordancewiththeprovisionssetforthinTable3.Table2DesignationQualityGradeTensileTestImpactTestYieldpointVs,N/mm2TensilestrengthVbN/mm2ElongationG5,Temperature,Vnotchimpactworklongitudinal,JThicknessdiameterofsteels,mmThicknessdiameterofsteels,mm”161640406060100100150150”161640406060100100150150NotlessthanNotlessthan•Q1951951853154303332Q125A215205195185175165335450313029282726B2027Q235A235225215205195185375500262524232221B2027C0D20Q255A255245235225215205410550242322212019B2027Q275275265255245235225490630201918171615Table3DesignationDirectionoftestpieceColdbendtestB2a180ºThicknessdiameterofsteels,mm6060100100200PindiameterdQ195Longitudinal0Transverse0.5aQ215Longitudinal0.5a1.5a2aTransversea2a2.5aQ235Longitudinala2a2.5aTransverse1.5a2.5a3aQ2552a3a3.5aQ2753a4a4.5aNoteBiswidthoftestpieceaisthicknessdiameterofsteels.5.4.1.1TheyieldpointofQ195shallbeonlyusedforreferenceandshallnotbedeemedasadeliverycondition.

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