GBT700-88 carbon structure steels.pdfGBT700-88 carbon structure steels.pdf

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APPROVEDBYCHINASTATEBUREAUOFQUALITYANDTECHNICALSUPERVISIONONJUNE1ST1988EFFECTIVEONOCTOBER1ST1988PAGE1OF8NATIONALSTANDARDOFTHEPEOPLE’SREPUBLICOFCHINAUDC6691401829GB70088SUBSTITUTEFORGB70079CARBONSTRUCTURALSTEELSTHISSTANDARDISREFERENCEDTOISO630STRUCTURALSTEEL1CONTENTSANDAPPLICABILITYTHISSTANDARDSPECIFIESTHETECHNICALCONDITIONSFORCARBONSTRUCTURALSTEELSTHISSTANDARDISINTENDEDFORGENERALSTRUCTURALSTEELSANDHOTROLLEDSTEELPLATES,STRIPS,SECTIONSTEELANDSTEELBARSFORENGINEERINGPURPOSETHESEPRODUCTSCANBEUSEDASCOMPONENTSFORWELDING,RIVETINGANDBOLTINGANDNORMALLYUSEDINDELIVERYCONDITIONSTHECHEMICALCOMPOSITIONSDEFINEDINTHESTANDARDAREAPPLICABLETOTHESTEELINGOTSINCLUDINGCONTINUOUSCASTINGBILLETS,BILLETSANDTHEIRPRODUCTS2NORMATIVEREFERENCESGB222METHODOFSAMPLINGSTEELFORDETERMINATIONOFCHEMICALCOMPOSITIONANDPERMISSIBLEDEVIATIONSFORPRODUCTANALYSISGB223METHODSFORCHEMICALANALYSISOFIRON,STEELANDALLOYGB228METALLICMATERIALSTENSILETESTINGGB232METALLICMATERIALSBENDTESTGB247GENERALRULEOFACCEPTANCE,PACKAGE,MARKANDCERTIFICATIONFORSTEELPLATESSHEETSANDSTRIPSGB2101GENERALREQUIREMENTSOFACCEPTANCE,PACKAGING,MARKINGANDCERTIFICATIONFORSECTIONSTEELGB2106METALLICMATERIALSCHARPYIMPACTTESTVNOTCHGB2975LOCATIONANDPREPARATIONOFTESTPIECESFORMECHANICALANDTECHNOLOGICALTESTINGGB4159METALLICMATERIALSCHARPYIMPACTTESTATLOWTEMPERATUREGB6397METALLICMATERIALSTESTPIECESFORTENSILETESTING3DENOMINATIONOFDESIGNATIONANDSYMBOLS31DENOMINATIONOFDESIGNATIONTHEDESIGNATIONOFSTEELCONSISTSOFALETTERSTANDINGFORTHEYIELDPOINT,YIELDINGSTRENGTH,ASYMBOLFORQUALITYGRADEANDASYMBOLFORDEOXIDATIONMETHODFOREXAMPLEQ235AFGB70088PAGE2OF832SYMBOLSQTHEFIRSTLETTERFORPINYINOFCHINESECHARACTER“QU”,REPRESENTINGYIELDPOINTOFSTEELS;A,B,C,DDIFFERENTQUALITYGRADESOFSTEELS;FTHEFIRSTLETTERFORPINYINOFCHINESECHARACTER“FEI”,REPRESENTINGRIMMEDSTEEL;BTHEFIRSTLETTERFORPINYINOFCHINESECHARACTER“BAN”,REPRESENTINGSEMIKILLEDSTEEL;ZTHEFIRSTLETTERFORPINYINOFCHINESECHARACTER“ZHEN”,REPRESENTINGKILLEDSTEEL;TZTHEFIRSTTWOLETTERSFORPINYINOFCHINESECHARACTERS“TEZHEN”,REPRESENTINGSPECIALKILLEDSTEEL;INDENOMINATIONOFDESIGNATIONCOMPOSITION,“Z”AND“TZ”AREOMITTED4DIMENSION,SHAPE,WEIGHTANDPERMISSIBLEDEVIATIONSTHEDIMENSION,SHAPE,WEIGHTANDPERMISSIBLEDEVIATIONSFORSTEELSSHALLBEINACCORDANCEWITHTHEPROVISIONSINRELEVANTSTANDARDS5TECHNICALREQUIREMENTS51DESIGNATIONSANDCHEMICALCOMPOSITION511THEDESIGNATIONSANDCHEMICALCOMPOSITIONHEATANALYSISFORSTEELSSHALLBEINACCORDANCEWITHTHEPROVISIONSSETFORTHINTABLE1TABLE1DESIGNATIONQUALITYGRADECHEMICALCOMPOSITION,DEOXIDATIONMETHODCMNSISPNOTMORETHANQ19500601202505003000500045F,B,ZQ215A00901502505503000500045F,B,ZB0045Q235A014022030065103000500045F,B,ZB01202003007010045CD01803508000400040ZDD01700350035TZQ255A01802804007003000500045F,B,ZB0045Q27502803805008003500500045B,ZNOTE1FORQ235AANDBRIMMEDSTEEL,THEUPPERLIMITOFMNCONTENTIS0605111THESICONTENTSHALLNOTBEGREATERTHAN007FORRIMMEDSTEELANDNOTGREATERTHAN017FORSEMIKILLEDSTEELTHELOWERLIMITOFSICONTENTINTHEKILLEDSTEELIS0125112THESTEELGRADEDSHALLCONTAINSUFFICIENTELEMENTSTHATFORMFINEGAINSTRUCTUREFORGB70088PAGE3OF8EXAMPLE,THEACIDSOLUBLEALUMINUMINTHESTEELSHALLNOTBELESSTHAN0015ORTOTALALUMINUMCONTENTSHALLNOTBELESSTHAN00205113THECONTENTOFRESIDUALELEMENTSSUCHASCR,NIANDCUINTHESTEELSHALLNOTBEGREATERTHAN030RESPECTIVELYTHENITROGENCONTENTINTHESTEELSMELTEDINOXYGENCONVERTERSHALLNOTBEGREATERTHAN0008THEANALYSISMAYBEEXEMPTEDIFTHEMANUFACTURERCANGUARANTEETHECOMPLIANCEOFTHESTEELASAGREEDBYTHEPURCHASER,ITISACCEPTABLETHATCUCONTENTINTHESTEELGRADEAISNOTMORETHAN035INTHISCASE,THEPURCHASERSHALLANALYZECUCONTENTANDINDICATEITINTHEQUALITYCERTIFICATE5114THERESIDUALCONTENTOFARSENICINTHESTEELSHALLNOTBEGREATERTHAN0080FORSTEELSMADEBYPIGIRONSMELTEDBYARSENICCONTAININGORE,THEARSENICCONTENTSHALLBEAGREEDUPONBYTHEMANUFACTURERANDTHEPURCHASERIFTHERAWMATERIALDOESN’TCONTAINARSENIC,THEANALYSISOFARSENICCONTENTINTHESTEELCANBEEXEMPTED5115IFTHEMECHANICALPROPERTIESOFSTEELSAREENSUREDTOBEINACCORDANCEWITHTHEPROVISIONSOFTHISSTANDARD,THEC,SIANDMNCONTENTFORGRADEASTEELOFVARIOUSDESIGNATIONSANDLOWERLIMITOFCANDMNCONTENTFORTHEOTHERGRADESOFVARIOUSDESIGNATIONSMAYNOTBEDEEMEDASADELIVERYCONDITIONHOWEVER,THECONTENTOFTHESEELEMENTSHEATANALYSISSHALLBESTATEDINTHEQUALITYCERTIFICATE5116WHILESUPPLYINGSTEELINGOTSINCLUDINGCONTINUOUSCASTINGBILLETSANDBILLETS,THEMANUFACTURERSHALLASSURETHECHEMICALCOMPOSITIONHEATANALYSISTOCOMPLYWITHTHEPROVISIONSSETFORTHINTABLE1HOWEVER,TOENSURETHEPROPERTIESOFROLLEDSTEELSTOMEETTHEREQUIREMENTOFTHISSTANDARD,THECHEMICALCOMPOSITIONFORSTEELGRADEAANDBCANBESUBJECTTOPROPERADJUSTMENTASREQUIREDBYTHEPURCHASERANDSEPARATEAGREEMENTSHALLBESIGNED512THEPERMISSIBLEDEVIATIONSFORCHEMICALCOMPOSITIONOFPRODUCTSTEELSANDCOMMERCIALBILLETSSHALLBEINACCORDANCEWITHTHEPROVISIONSSETFORTHINTABLE1OFGB222NOREQUIREMENTSAREMADEONTHEPERMISSIBLEDEVIATIONSFORCHEMICALCOMPOSITIONOFPRODUCTSTEELSANDCOMMERCIALBILLETSFORSKILLEDSTEELS52SMELTINGPROCESSTHESTEELSSHALLBESMELTEDINTHEOXYGENCONVERTER,OPENHEARTHORELECTRICFURNACEUNLESSOTHERWISEREQUESTEDBYTHEPURCHASERANDSPECIFIEDINTHECONTRACT,THESELECTINGOFMELTINGPROCESSSHALLBELEFTTOTHEDISCRETIONOFTHEMANUFACTURER53DELIVERYCONDITIONSNORMALLY,THESTEELSAREDELIVEREDINHOTROLLEDINCLUDINGCONTROLLEDROLLEDCONDITIONIFREQUESTEDBYTHEPURCHASERANDAGREEDBYBOTHPARTIES,THESTEELCANBEDELIVEREDINNORMALIZEDSTATEWITHTHEEXCEPTIONOFSTEELGRADEA54MECHANICALPROPERTIES541THERESULTSOFTENSILETESTANDIMPACTTESTSHALLBEINACCORDANCEWITHTHEPROVISIONSGB70088PAGE4OF8SETFORTHINTABLE2THERESULTSOFBENDTESTSHALLBEINACCORDANCEWITHTHEPROVISIONSSETFORTHINTABLE3TABLE2DESIGNATIONQUALITYGRADETENSILETESTIMPACTTESTYIELDPOINTVS,N/MM2TENSILESTRENGTHVBN/MM2ELONGATIONG5,TEMPERATURE,VNOTCHIMPACTWORKLONGITUDINAL,JTHICKNESSDIAMETEROFSTEELS,MMTHICKNESSDIAMETEROFSTEELS,MM”161640406060100100150150”161640406060100100150150NOTLESSTHANNOTLESSTHAN•Q1951951853154303332Q125A215205195185175165335450313029282726B2027Q235A235225215205195185375500262524232221B2027C0D20Q255A255245235225215205410550242322212019B2027Q275275265255245235225490630201918171615TABLE3DESIGNATIONDIRECTIONOFTESTPIECECOLDBENDTESTB2A180THICKNESSDIAMETEROFSTEELS,MM6060100100200PINDIAMETERDQ195LONGITUDINAL0TRANSVERSE05AQ215LONGITUDINAL05A15A2ATRANSVERSEA2A25AQ235LONGITUDINALA2A25ATRANSVERSE15A25A3AQ2552A3A35AQ2753A4A45ANOTEBISWIDTHOFTESTPIECE;AISTHICKNESSDIAMETEROFSTEELS5411THEYIELDPOINTOFQ195SHALLBEONLYUSEDFORREFERENCEANDSHALLNOTBEDEEMEDASADELIVERYCONDITION
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