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GB 712-2000 Hull structure steel.pdf

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GB 712-2000 Hull structure steel.pdf

ApprovedbyChinaStateBureauofQualityandTechnicalSupervisiononApril11th2000EffectiveonNovember1st2000Page1of13NationalStandardsofthePeoplesRepublicofChinaGB7122000SubstituteforGB7121988HullStructuralSteel1ScopeThisstandardspecifiesthedimension,shape,technicalrequirements,testmethod,inspectionrules,packaging,markingandqualitycertificateofhullstructuralsteel.Thestandardisapplicableforthemanufactureofgeneralstrengthandhighstrengthsteelforhullstructurecoveringtheocean,coastalandinlandnavigationarea,includingsteelplateshavingadiameternotmorethan100mmorsectionsteelwiththewallthicknessordiameternotmorethan50mm.Thehullstructuralsteelsingots,billets,materialaremanufacturedbysuchsteelfactoriesasapprovedbyRegisterofShippingofthePeoplesRepublicofChinaorChinaClassificationSocietyhereinafterreferredtoasClassSociety.2NormativeReferencesThefollowingstandardscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofGB7122000.Atthetimeofpublication,alleditionsindicatedwerevalid.Asallstandardsaresubjecttorevision,andthepartiestoagreementsbasedonGB7122000areencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthestandardsindicatedbelow.GB/T2221984MethodofsamplingsteelforthedeterminationofchemicalcompositionandpermissiblevariationsforproductanalysisGB/T223.31988Methodsforchemicalanalysisofiron,steelandalloyGravimetricMethodofdiantipyrylmethanephosphomolybdateforthedeterminationofphosphoruscontentGB/T223.41988Methodsforchemicalanalysisofiron,steelandalloyThevolumetricmethodforthedeterminationofmanganesecontentbyammoniumnitrateoxidationGB/T223.111991Methodsforchemicalanalysisofiron,steelandalloyTheammoniumpersulfateoxidationvolumetricmethodforthedeterminationofchromiumcontentGB/T223.142000Methodsforchemicalanalysisofiron,steelandalloyTheNbenzoylNphenylhydroxylamineextractionphotometricmethodforthedeterminationofvanadiumcontentGB/T223.161991Methodsforchemicalanalysisofiron,steelandalloyThechromotropicacidphotometricmethodforthedeterminationoftitaniumcontentGB7122000Page2of13GB/T223.171989Methodsforchemicalanalysisofiron,steelandalloyThediantipyrylmethanephotometricmethodforthedeterminationoftitaniumcontentGB/T223.181994Methodsforchemicalanalysisofiron,steelandalloyThesodiumthiosulfateseparationiodimetricmethodforthedeterminationofcuppercontentGB/T223.191989Methodsforchemicalanalysisofiron,steelandalloyTheneocuproinechloroformextractionphotometricmethodforthedeterminationofcoppercontentGB/T223.231994Methodsforchemicalanalysisofiron,steelandalloyThedimethylglyoximespectrophotometricmethodforthedeterminationofnickelcontentGB/T223.241994Methodsforchemicalanalysisofiron,steelandalloyTheextractionseperationThedimethylglyoximespectrophotometricmethodforthedeterminationofnickelcontentGB223.261989Methodsforchemicalanalysisofiron,steelandalloyThethiocyanatedirectphotometricmethodforthedeterminationofmolybdenumcontentGB223.271994Methodsforchemicalanalysisofiron,steelandalloyThethiocyanatebutylacetateextractionspectrophotometricmethodforthedeterminationofmolybdenumcontentGB/T223.361994Methodsforchemicalanalysisofiron,steelandalloyTheneutraltitrationmethodforthedeterminationofnitrogencontentafterdistillationseparationGB/T223.371989Methodsforchemicalanalysisofiron,steelandalloyTheindophenolbluephotometricmethodsforthedeterminationofnitrogencontentafterdistillationseparationGB/T223.401985Methodsforchemicalanalysisofiron,steelandalloyTheanionexchangeseparationsulphochlorophenolSphotometricmethodforthedeterminationofniobiumcontentGB/T223.541987Methodsforchemicalanalysisofiron,steelandalloyTheflameatomicabsorptionspectrophotometricmethodforthedeterminationofnickelcontentGB/T223.581987Methodsforchemicalanalysisofiron,steelandalloyThesodiumarsenitesodiumnitritetitrimetricmethodforthedeterminationofmanganesecontentGB/T223.591987Methodsforchemicalanalysisofiron,steelandalloyThereducedmolybdoantimonylphosphoricacidphotometricmethodforthedeterminationofphosphoruscontentGB/T223.601997Methodsforchemicalanalysisofiron,steelandalloyTheperchloricaciddehydrationgravimetricmethodforthedeterminationofsiliconcontentGB/T223.611988Methodsforchemicalanalysisofiron,steelandalloyTheammoniumphosphomolybdatevolumetricmethodforthedeterminationofphosphoruscontentGB/T223.621988Methodsforchemicalanalysisofiron,steelandalloyThebutylGB7122000Page3of13acetateextractionphotometricmethodforthedeterminationofphosphoruscontentGB/T223.631988Methodsforchemicalanalysisofiron,steelandalloyThesodiumpotassiumperiodatephotometricmethodforthedeterminationofmanganesecontentGB223.641988Methodsforchemicalanalysisofiron,steelandalloyTheflameatomicabsorptionspectrometricmethodforthedeterminationofmanganesecontentGB/T223.681997Methodsforchemicalanalysisofiron,steelandalloyThepotassiumiodatetitrationmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontentGB/T223.691997Methodsforchemicalanalysisofiron,steelandalloyThegasvolumetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontentGB/T223.711997Methodsforchemicalanalysisofiron,steelandalloyThegravimetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontentGB/T223.721991Methodsforchemicalanalysisofiron,steelandalloyThealuminachromatographicseparationbariumsulfategravimetricmethodforthedeterminationofsulphurcontentGB/T223.741997Methodsforchemicalanalysisofiron,steelandalloyThecombustiongravimetric/gasvolumetricmethodforthedeterminationofcombinedcarboncontentGB/T223.761994Methodsforchemicalanalysisiron,steelandalloyTheflameatomicabsorptionspertrometricmethodforthedeterminationofvanadiumcontentGB/T2281987MetallicmaterialsTensiletestingGB/T2291994MetallicmaterialsCharpynotchimpacttestGB/T2321999MetallicmaterialsBendtestGB/T2471997Generalruleofacceptance,package,markandcertificationforsteelplatessheetsandstripsGB/T7091988Dimensions,shape,weightandtolerancesforhotrolledplatesandsheetsGB/T21011989Generalrequirementsofacceptance,packaging,markingandcertificationforsectionsteel3ClassificationandSymbols3.1Thehullstructuralsteelisclassifiedintogeneralstrengthsteelandhighstrengthsteel.ThegeneralstrengthsteelisclassifiedintosuchfourqualitygradesasA,B,DandE.ThehighstrengthsteelisclassifiedintothreestrengthgradesandfourqualitygradesasfollowsA32,D32,E32,F32,A36,D36,E36,F36,A40,D40,E40andF40.GB7122000Page4of134Dimension,Shape,WeightandPermissibleDeviations4.1Thedimension,shapeandpermissibledeviationsofsteelplates,includingthethicknesstolerance,shallbeinaccordancewithrelevantprovisionsinGB/T709.Theminusdeviationofthicknessshallnotbemorethan0.3mm.4.1.1Thesteelplateshallbedeliveredonthebasisoftheoreticalweight.Subjectttotheconsentofthepurchaserandbyagreementbetweenthepurchaserandthemanufacturer,thetheoreticalthicknessforcalculationshallbeappliedwiththenominalthicknessofthesteelplateplusadditionalvalue.TheadditionalvalueofthicknessiscalculatedasfollowsAdditionalvalueofthicknesstolerancevalue/20.3mmNotesthetolerancevaluemeansthetolerancegiveninGB/T709,thatis,theabsolutevalueofpositivedeviationplusminusdeviation.4.2Thedimension,shape,weightandpermissibledeviationsofsectionsteelshallbeinconformitywiththeprovisionsdefinedintherelevantstandards.5TechnicalConditions5.1ChemicalComposition5.1.1ThechemicalcompositionsheatanalysisforgeneralstrengthsteelsshallbeinaccordancewithprovisionssetforthinTable1.SteelGradeABDEChemicalCompositionC”0.21”0.21”0.21”0.18Si”0.50”0.35”0.35”0.35Mn•2.5C0.801.200.601.200.701.20P”0.035”0.035”0.035”0.035S”0.035”0.035”0.035”0.035Als•0.015•0.0155.1.1.1Asagreedbythepurchaserandspecifiedinthecontract,forgradeAsteelwiththicknessnotgreaterthan12.5mm,rimmedsteelcanbeapplied,whichshallbespecifiedindicatedinthequalitycertificate.5.1.1.2Thelowerlimitofcarboncontentformerchantsteelbilletsshallbeagreeduponbyandbetweenthepurchaserandthemanufacturer.5.1.1.3Theupperlimitofcarboncontentofsectionsteelcanbeupto0.23.5.1.1.4ThecarbonequivalentforallsteelsindifferentqualitygradesisC1/6Mn”0.40.5.1.1.5IncasetheimpacttestiscarriedoutforGradeBsteel,thelowerlimitofMncontent

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