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GBT碳素结构钢EN
ICS40
NationalstandardofthePeople'sRepublicofChina
GB/T700-2006
ReplaceGB/T700-1988
碳素结构钢
Carbonstructuralsteels
(ISO630:
1995,Structuralsteels–
Plates,wideflats,bars,sectionsandprofiles,NEQ)
Issuedate:
Nov1,2006Implementationdate:
Feb1,2007
Issuedby:
GeneralAdministrationofQualitySupervision,InspectionandQuarantineofthePeople’sRepublicofChina
StandardizationAdministrationofthePeople'sRepublicofChina(SAC)
Foreword
ThisstandardisnotequivalenttoISO630:
1995StructuralSteelsintherespectofconsistency.Themaindifferencesbetweenthetwostandardsareasfollows:
-Nogradesarespecifiedcorrespondingtotheyieldstrengthlevelsof185N/mm2and355N/mm2;
-GradesQ195andQ215arespecifiedcorrespondingtolevels195N/mm2and215N/mm2;
-ThephosphoruscontentsofclassAsteelsofQ235andQ275aredecreasedby%;
ThethicknessofQ235classBsteelisdividedintotwolevelsaccordingtothedeoxidizationmethodandthecarboncontentis%inbothlevels;
-Q235classBsteelofwhichthethicknessissmallerthan25mmmaynotbesubjecttotestwiththeconsentofthebuyerifthesuppliercanensurethattheimpactabsorbedenergyisuptostandard;
-TheyieldstrengthofQ275steelofwhichthethicknessisbiggerthan80mm~100mmisincreasedby10N/mm2;
-Coldbendingtestisadded;
-DetailedbatchingrulesarespecifiedaccordingtothesituationofChina.
ThisstandardreplacesGB/T700-1988CarbonStructuralSteelsandhasthefollowingchangesincomparisonwithGB/T700-1988:
-Semi-killedsteeliscancelledin“deoxidizationmethod”;
-GradesQ255andQ275inGB/T700-1988arecancelled;
-GradeE275inISO630:
1995isnewlyaddedandchangedtothenewgradeQ275;
-Thelowerlimitsofcarbonandmanganesecontentsofeachgradearecancelled,andtheupperlimitofmanganesecontentisincreased;
-Thelimitofsiliconcontentofrimmedsteelandkilledsteeliscancelled;
-siliconcontentischangedfrom%to%(exceptforQ195);
-ThephosphorusandsulphurcontentsofgradeQ195aredecreasedrespectivelyfrom%and%to%and%;
-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.
Carbonstructuralsteels
1Scope
Thisstandardspecifiesthegrade,dimension,shape,weightandpermissibledeviation,technicalrequirements,testmethods,inspectionrules,packing,markingandqualitycertificateofcarbonstructuralsteel.
Thisstandardisapplicabletothestructuralhotrolledsteelsheets,steelstrips,sectionalsteelsandbarsteelsgenerallyusedforwelding,rivetingandboltingengineeringindeliverystate.
Thechemicalcompositionspecifiedbythisstandardisalsoapplicabletosteelingots,continuouscastingbillets,steelbilletsandtheirproducts.
2Normativereferences
Thefollowingnormativedocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthisstandard.Fordatedreferences,subsequentamendments(notincludingcorrections)to,orrevisionsof,anyofthesepublicationsdonotapply.Howeverpartiestoagreementsbasedonthisstandardareencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.Forundatedreferences,thelatesteditionofthenormativedocumentreferredtoapplies.
GB/T222-2006Permissibletolerancesforchemicalcompositionofsteelproducts
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thediantipyrylmethanephosphomolybdategravimetricmethodforthedeterminationofphosphoruscontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thecupferronseparation-chromeazurolSphotometricmethodforthedeterminationofaluminumcontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theammoniumpersulfateoxidationvolumetricmethodforthedeterminationofchromiumcontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thesodiumthiosulfateseparationiodimetricmethodforthedeterminationofcoppercontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theneocuproine-chloroformextractionphotometricmethodforthedeterminationofcoppercontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theextractionseparation-dimethylglyoximespectrophotometricmethodforthedeterminationofnickelcontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thehypophosphitereduction-iodimetricmethodforthedeterminationofarseniccontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theindophenolbluephotometricmethodforthedeterminationofnitrogencontentafterdistillationseparation
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thesodiumarsenite-sodiumnitritetitrimetricmethodforthedeterminationofmanganesecontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thereducedmolybdoantimonylphosphoricacidphotometricmethodforthedeterminationofphosphoruscontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theperchloricaciddehydrationgravimetricmethodforthedeterminationofsiliconcontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thesodium(potassium)periodatephotometricmethodforthedeterminationofmanganesecontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Theflameatomicabsorptionspectrometricmethodforthedeterminationofmanganesecontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thepotassiumiodatetitrationmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy--Thegravimetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontent
GB/TMethodsforchemicalanalysisofiron,steelandalloy—Thealuminachromatographicseparation-bariumsulfategravimetricmethodforthedeterminationofsulphurcontent
GB/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)andstrips
GB/T2101Generalregulationofthecheckout,package,markandqualitycertificateofprofiledbar
GB/T2975Steelandsteelproducts–Locationandpreparationoftestpiecesformechanicaltesting(GB/T2975-1998,eqvISO377:
1997)
GB/T4336Standardtestmethodforsparkdischargeatomicemissionspectrometricanalysisofcarbonandlow-alloysteel(routinemethod)
GB/T20066Steelandiron--Samplingandpreparationofsamplesforthedeterminationofchemicalcomposition(GB/T20066-2006,ISO14284:
1996,IDT)
3Denotationofthegradeandsymbols
Denotationofthegrade
Thegradeofsteeliscomposedoftheletterrepresentingyieldstrength,valueofyieldstrength,symbolofqualitygradeandsymbolofdeoxidizationmethodinturn.Forexample:
Q235AF.
Symbols
Q-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,weightandpermissibledeviation
Thedimension,shape,weightandpermissibledeviationofsteelsheets,steelstrips,sectionalsteelsandbarsteelsshallmeetthespecificationofthecorrespondingstandardsrespectively.
5Technicalrequirements
Gradeandchemicalcomposition
5.1.1Thegradeandchemicalcomposition(smeltinganalysis)ofthesteelshallconformtoTable1.
Table1
Grade
UnifiedNumericalCodea
Class
Thickness(orDiameter)/mm
DeoxidizationMetod
ChemicalComposition(MassPercentage)/%,nothigherthan
C
Si
Mn
P
S
Q195
U11952
--
--
F,Z
Q215
U12152
A
--
F,Z
U12155
B
Q235
U12352
A
--
F,Z
U12355
B
U12358
C
Z
U12359
D
TZ
Q275
U12752