gbt 700- 碳素结构钢-en

------------------------------------------作者xxxx------------------------------------------日期xxxxGBT700-2006碳素结构钢-EN【精品文档】【精品文档】【精品文档】【精品文档】【精品文档】【精品文档】H40NationalstandardofthePeople'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-dimethylglyoximespectrophotometricmethodforthedeterminationofnickelcontentGB/T223.32Methodsforchemicalanalysisofiron,steelandalloy--Thehypophosphitereduction-iodimetricmethodforthedeterminationofarseniccontentGB/T223.37Methodsforchemicalanalysisofiron,steelandalloy--TheindophenolbluephotometricmethodforthedeterminationofnitrogencontentafterdistillationseparationGB/T223.58Methodsforchemicalanalysisofiron,steelandalloy--Thesodiumarsenite-sodiumnitritetitrimetricmethodforthedeterminationofmanganesecontentGB/T223.59Methodsforchemicalanalysisofiron,steelandalloy--ThereducedmolybdoantimonylphosphoricacidphotometricmethodforthedeterminationofphosphoruscontentGB/T223.60Methodsforchemicalanalysisofiron,steelandalloy--TheperchloricaciddehydrationgravimetricmethodforthedeterminationofsiliconcontentGB/T223.63Methodsforchemicalanalysisofiron,steelandalloy--Thesodium(potassium)periodatephotometricmethodforthedeterminationofmanganesecontentGB/T223.64Methodsforchemicalanalysisofiron,steelandalloy--TheflameatomicabsorptionspectrometricmethodforthedeterminationofmanganesecontentGB/T223.68Methodsforchemicalanalysisofiron,steelandalloy--ThepotassiumiodatetitrationmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontentGB/T223.71Methodsforchemicalanalysisofiron,steelandalloy--ThegravimetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontentGB/T223.72Methodsforchemicalanalysisofiron,steelandalloy—Thealuminachromatographicseparation-bariumsulfategravimetricmethodforthedeterminationofsulphurcontentGB/T228Metallicmaterials-Tensiletestingatambienttemperature(GB/T228-2002,eqvISO6892:1998)GB/T229Metallicmaterials-Charpynotchimpacttest(GB/T229-1994,eqvISO83:1976,eqvISO148:1983)GB/T232Metallicmaterials--Bendtest(GB/T232-1999,eqvISO7438:1985)GB/T247Generalruleofacceptance,package,markandcertificationforsteelplates(sheets)andstripsGB/T2101Generalregulationofthecheckout,package,markandqualitycertificateofprofiledbarGB/T2975Steelandsteelproducts–Locationandpreparationoftestpiecesformechanicaltesting(GB/T2975-1998,eqvISO377:1997)GB/T4336Standardtestmethodforsparkdischargeatomicemissionspectrometricanalysisofcarbonandlow-alloysteel(routinemethod)GB/T20066Steelandiron--Samplingandpreparationofsamplesforthedeterminationofchemicalcomposition(GB/T20066-2006,ISO14284:1996,IDT)3Denotationofthegradeandsymbols3.1DenotationofthegradeThegradeofsteeliscomposedoftheletterrepresentingyieldstrength,valueofyieldstrength,symbolofqualitygradeandsymbolofdeoxidizationmethodinturn.Forexample:Q235AF.3.2SymbolsQ-FirstletterofChinesephoneticspellingforthe“Qu”wordofsteelyieldstrength;A,B,C,D-arerespectivelyqualitygrade;F-FirstletterofChinesephoneticspellingforthe“Fei”wordofrimmedsteel;Z-FirstletterofChinesephoneticspellingforthe“Zhen”wordofkilledsteel;TZ-FirstlettersofChinesespellingforthe“Tezhen”wordofspecialkilledsteel.Inthedenotationofgradecomponents,symbols“Z”and“TZ”canbeomitted.4Dimension,shape,weightandpermissibledeviationThedimension,shape,weightandpermissibledeviationofsteelsheets,steelstrips,sectionalsteelsandbarsteelsshallmeetthespecificationofthecorrespondingstandardsrespectively.5Technicalrequirements5.1GradeandchemicalcompositionThegradeandchemicalcomposition(smeltinganalysis)ofthesteelshallconformtoTable1.Table1GradeUnifiedNumericalCodeaClassThickness(orDiameter)/mmDeoxidizationMetodChemicalComposition(MassPercentage)/%,nothigherthanCSiMnPSQ195U11952----F,ZQ215U12152A--F,ZU12155BQ235U12352A--F,ZU12355BbU12358CZU12359DTZQ275U12752A--F,ZU12755B≤40Z＞40U12758C--ZU12759DTZaThecodeslistedinthetablearetheunifiednumericalcodesforkilledandspecialkilledsteels.Theunifiednumericalcodesforrimmedsteelsareasfollows:Q195F-U11950;Q215AF-U12150,Q215BF-U12153;Q235AF-U12350,Q235BF-U12353;Q275AF-U12750.bWiththeconsentofthebuyer,thecarboncontentofQ235Bmaynotbehigherthan0.22%..1ClassDsteelsshallhavetheelementwithsufficientlyrefinedgrains,ofwhichthecontentshallbeindicatedinthequalitycertificate.Whenaluminumdeoxidizationisused,thecontentofacidsolublealumniuminthesteelshallnotbelowerthan0.015%or,alternatively,thetotalaluminumcontentshallnotbelowerthan0.020%..2Thecontentsofresidualelementschromium,nickelandcopperinthesteelshallnotbehigherthan0.30%respectively,thenitrogencontentshallnotbehigherthan0.008%.Thecontentsoftheseelementsmaynotbesubjecttoanalysisiftheycanbeguaranteedbythesupplier.Thenitrogencontentisallowedtoexceedthevaluespecifiedin5.1.1.2.However,withevery0.001%incrementofnitrogencontent,themaximumphosphoruscontentshalldecreaseby0.005%,themaximumnitrogencontentobtainedthroughsmeltinganalysisshallnotbehigherthan0.012%.Ifthecontentofacidsolublealuminuminthesteelisnotlowerthan0.015%orthetotalaluminumcontentisnotlowerthan0.020%,theupperlimitofnitrogencontentmaynotbelimited.Theelementsfornitrogenfixationshallbeindicatedinthequalitycertificate..2.2Withtheconsentofthebuyer,thecoppercontentofclassAsteelmaynotbehigherthan0.35%.Inthiscase,thesuppliershallanalyzethecoppercontentandindicateitscontentinthequalitycertificate..3Thearseniccontentinthesteelshallnotbehigherthan0.080%.Forthesteelssmeltedwitharsenicmineralsmeltingpigiron,thearseniccontentshallbespecifiedthroughnegotiationbetweenbothparties.Iftherawmaterialdoesnotcontainarsenic,theanalysisofarsenicmaynotbecarriedout..4Ifitcanbeensuredthatthemechanicalpropertiesofthesteelmeetthespecificationofthisstandard,thecarbon,manganeseandsiliconcontentsoftheClassAsteelofeachgrademaynotbeusedastermsofdelivery.However,theircontentsshallbeindicatedinthequalitycertificate.5.1.1.5Incasecommercialcontinuouscastingbillets,steelingotsandsteelbilletsaresupplied,thelowerlimitsofcarbonandmanganesecontentsofeachgradecanbespecifiedaccordingtotherequirementsofthebuyerinordertoensurethattheperformancesofrolledsteelsmeettherequirementsofthisstandard.Thepermissibledeviationofthechemicalcompositionofsteelproduct,continuouscastingbilletandsteelbilletshallmeetthespecificationofTable1ofGB/T222-2006.Thenitrogencontentispermittedtoexceedthespecifiedvalue.However,itmustmeettherequirementofclause.2.1.Themaximumnitrogencontentobtainedthroughproductanalysisshallnotbehigherthan0.014%.Ifthealuminumcontentinthesteelreachesthevaluespecifiedinandisspecifiedinthequalitycertificate,theupperlimitofnitrogencontentmaynotbelimited.Thechemicalcompositiondeviationoftheproductsandbilletsofrimmedsteelisnotguaranteed.SmeltingmethodThesteelissmeltedinoxygenconverterorelectricfurnace.Thesmeltingmethodisgenerallyselectedbythesupplierunlessthebuyerhasspecialrequirementsandtheyarenotedinthecontract.DeliverystateThesteelsaregenerallydeliveredinhotrolled,controlledrolledornormalizedstate.MechanicalpropertyTheresultsoftensileandimpacttestsofthesteelshallmeetthespecificationofTable2.TheresultofbendingtestshallmeetthespecificationofTable3.Thethickness(diameter)ofthesteelproductsmadeofQ195andQ235classBrimmedsteelsshallnotbebiggerthan25mm.Whencarryingouttensileandcoldbendingtests,longitudinalsamplesshallbetakenforsectionalsteelsandbarsteels,transversesamplesshallbetakenforsteelsheetsandsteelstrips.Theelongationafterfractureisallowedtobe2%lower(absolutevalue)thanthevaluespecifiedinTable2.Ifthetransversesamplingofnarrowsteelstripsislimitedbythewidth,longitudinalsamplescanbetaken.InspectionmaynotbecarriedoutifthesuppliercanensurethatthecoldbendingtestmeetsthespecificationofTable3.IfClassAsteelpassesthecoldbendingtest,theupperlimitoftensilestrengthmaynotbeusedasatermofdelivery.Thesteelproductsofwhichthethicknessisnotsmallerthan12mmorthediameterisnotsmallerthan16mmshallbesubjecttoimpacttest.Thedimensionofsampleis10mm×10mm×55mm.Throughnegotiationbetweenbothparties,thesteelsofwhichthethicknessis6mm-12mmorthediameteris12mm-16mmcanbesubjecttoimpacttest.Thedimensionofsampleis10mm××55mmor10mm×5mm×55mmor10mm×productthickness×55mm.ThespecifiedimpactabsorbedenergyisgiveninAnnexA.Forexample,ifthesampleof10mm×5mm×55mmisused,thetestresultshallnotbesmallerthan50%ofthespecifiedvalue.TheCharpy(V-notch)impactabsorbedenergyshallbeobtainedbycalculatingthearithmeticmeanofthesinglevaluesofthreesamplesinonegroup.Thesinglevalueofonesampleisallowedtobelessthanthespecifiedvalue.However,itshallnotbelessthan70%ofthespecifiedvalue.Iftheaboveconditionisnotmet,carryoutthetestonanotherthreesamplestakenfromthesameproduct,themeanvalueofthesixsamplesshallnotbelessthanthespecifiedvalue.Thevaluesoftwosamplesareallowedtobelessthanthespecifiedvalue.However,onlyonesampleisallowedtobelessthan70%ofthespecifiedvalue.Table2GradeClassYieldStrengthaReH/(N/mm2),notlessthanTensileStrengthbRm/(N/mm2)ElongationafterFractureA/%,notlessthanImpactTest(V-Notch)Thickness(orDiameter)/mmThickness(orDiameter)/mmTemperature/℃ImpactAbsorbedEnergy(Longitudinal)/Jnotlessthan≤16＞16～40＞40～60＞60～100＞100～150＞150～200≤40＞40～60＞60～100＞100～150＞150～200Q195--195185--------315～43033------------Q215A215205195185175165335～4503130292726----B+2027Q235A235225215215195185370～5002625242221----B+2027cC0D－20Q275A275265255245225215410～5402221201817----B+2027C0D－20aTheyieldstrengthofQ195isforreferenceonlyandnotusedasatermofdelivery.bForthesteelproductsofwhichthethicknessisbiggerthan100mm,thelowerlimitoftensilestrengthisallowedtodecreaseby20N/mm2.Theupperlimitofthetensilestrengthofwidestripsteel(includingshearedsteelplate)isnotusedasatermofdelivery.cQ235classBsteelofwhichthethicknessissmallerthan25mmmaynotbesubjecttotestwiththeconsentofthebuyerifthesuppliercanensurethattheimpactabsorbedenergyisuptostandard.Table3GradeDirectionofSampleColdBendingTest180°B=2aaThickness(orDiameter)ofSteelProductb/mm≤60＞60～100BendingDiameterdQ195Longitudinal0---TransverseQ215LongitudinalTransversea2aQ235Longitudinala2aTransverseQ275LongitudinalTransverse2a3aaBisthewidthofthesample,aisthethickness(diameter)ofthesample.bIfthethickness(diameter)ofthesteelproductisbiggerthan100mm,thebendingtestshallbedeterminedthroughnegotiationbetweenbothparties.5.5SurfacequalityThesurfacequalityofsteelproductsshallrespectivelymeetthespecificationsoftherelevantproductstandardsforsteelsheets,steelstrips,sectionalsteelsandbarsteels.6TestmethodsTheinspectionitems,samplingnumber,samplingmethodsandtestmethodsforeacheatchofsteelproductsshallmeetthespecificationsofTable4.Table4No.InspectionItemSamplingNumber/PieceSamplingMethodTestMethod1Chemicalanalysis1(perfurnace)GB/T20066GB/T223seriesstandardsandGB/T4336inChapter22Tensile1GB/T2975GB/T2283ColdbendingGB/T2324Impact3GB/T2296.2Intensileandcoldbendingtests,thelongitudinalaxisofthesamplesofsteelsheetsandsteelstripsshallbeperpendiculartotherollingdirection,whilethelongitudinalaxisofthesamplesofsectionalsteels,barsteelsandnarrowsteelstripslimitedbythewidthshallbeparalleltotherollingdirection.Thelongitudinalaxisoftheimpactsampleshallbeparalleltotherollingdirection.Theimpactsamplecanreserveonerolledsurface.7Inspectionrules7.1Theinspectionandacceptanceofthesteelproductsshallbecarriedoutbythetechnicalsupervisiondepartmentofthesupplier.Thebuyerhastherighttocarryoutinspectionandacceptanceonanyinspectionitemspecifiedinthisstandardorthecontract.7.2Thesteelproductsshallbeacceptedinbatches,eachbatchcomprisedofthesteelproductsofthesamegrade,samefurnacenumber,samequalitygrade,samevariety,samedimensionandsamedeliverystate.Theweightofeachbatchshallnotbegreaterthan60t.Forthesteelproductsrolledwiththesteelssmeltedinthesteel-makingfurnacesofwhichthenominalcapacityissmall,theClassAorClassBsteelsofthesamefurnacenumberandsamegradeandmanufacturedbythesamesmelting,pouringanddeoxidizationmethodsareallowedtoformamixedbatch.However,thecarboncontentdifferencebetweenthevariousfurnacenumbersofeachbatchshallnotbebiggerthan0.02%,themanganesecontentdifferenceshallnotbebiggerthan0.15%.7.3IftheCharpy(V-notch)impacttestresultofthesteelproductdoesnotmeetthespecificationof,thesamplingproductshallberejected.Takeanothertwosamplingproductsfromtheremainingpartofthisinspectionbatchandselectanewgroupofthreesamplesfromeachsamplingproduct.Theretestresultsofthesetwogroupsofsamplesshallbeeligible.Otherwise,thisbatchofproductshallnotbedelivered.7.4TheretestandinspectionrulesofotherinspectionitemsofsteelproductsshallmeetthespecificationsofGB/T247andGB/T2101.8Packing,markingandqualitycertificateThepacking,markingandqualitycertificateofthesteelproductshallmeetthespecificationsofGB/T247andGB/T2101.AnnexA(Normative)Impactabsorbedenergyofsmall-sizedimpactsampleImpactabsorbedenergyofnotchedsampleWidthofsample/mmFigureA.1Minimumimpactabsorbedenergyofthesamplesofwhichthewidthis5mm-10mm