gbt 700 碳素结构钢en讲课教案.docx

gbt 700 碳素结构钢en讲课教案.docx

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gbt700碳素结构钢en讲课教案

GBT700-2006碳素结构钢-EN

ICS77.140.45

H40

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;

-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.

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/T223.3Methodsforchemicalanalysisofiron,steelandalloy--Thediantipyrylmethanephosphomolybdategravimetricmethodforthedeterminationofphosphoruscontent

GB/T223.10Methodsforchemicalanalysisofiron,steelandalloy--Thecupferronseparation-chromeazurolSphotometricmethodforthedeterminationofaluminumcontent

GB/T223.11Methodsforchemicalanalysisofiron,steelandalloy--Theammoniumpersulfateoxidationvolumetricmethodforthedeterminationofchromiumcontent

GB/T223.18Methodsforchemicalanalysisofiron,steelandalloy--Thesodiumthiosulfateseparationiodimetricmethodforthedeterminationofcoppercontent

GB/T223.19Methodsforchemicalanalysisofiron,steelandalloy--Theneocuproine-chloroformextractionphotometricmethodforthedeterminationofcoppercontent

GB/T223.24Methodsforchemicalanalysisofiron,steelandalloy--Theextractionseparation-dimethylglyoximespectrophotometricmethodforthedeterminationofnickelcontent

GB/T223.32Methodsforchemicalanalysisofiron,steelandalloy--Thehypophosphitereduction-iodimetricmethodforthedeterminationofarseniccontent

GB/T223.37Methodsforchemicalanalysisofiron,steelandalloy--Theindophenolbluephotometricmethodforthedeterminationofnitrogencontentafterdistillationseparation

GB/T223.58Methodsforchemicalanalysisofiron,steelandalloy--Thesodiumarsenite-sodiumnitritetitrimetricmethodforthedeterminationofmanganesecontent

GB/T223.59Methodsforchemicalanalysisofiron,steelandalloy--Thereducedmolybdoantimonylphosphoricacidphotometricmethodforthedeterminationofphosphoruscontent

GB/T223.60Methodsforchemicalanalysisofiron,steelandalloy--Theperchloricaciddehydrationgravimetricmethodforthedeterminationofsiliconcontent

GB/T223.63Methodsforchemicalanalysisofiron,steelandalloy--Thesodium（potassium）periodatephotometricmethodforthedeterminationofmanganesecontent

GB/T223.64Methodsforchemicalanalysisofiron,steelandalloy--Theflameatomicabsorptionspectrometricmethodforthedeterminationofmanganesecontent

GB/T223.68Methodsforchemicalanalysisofiron,steelandalloy--Thepotassiumiodatetitrationmethodaftercombustioninthepipefurnaceforthedeterminationofsulfurcontent

GB/T223.71Methodsforchemicalanalysisofiron,steelandalloy--Thegravimetricmethodaftercombustioninthepipefurnaceforthedeterminationofcarboncontent

GB/T223.72Methodsforchemicalanalysisofiron,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

3.1Denotationofthegrade

Thegradeofsteeliscomposedoftheletterrepresentingyieldstrength,valueofyieldstrength,symbolofqualitygradeandsymbolofdeoxidizationmethodinturn.Forexample:

Q235AF.

3.2Symbols

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

5.1Gradeandchemicalcomposition

5.1.1Thegradeandchemicalcomposition（smeltinganalysis）ofthesteelshallconformtoTable1.

Table1

Grade

UnifiedNumericalCodea

Class

Thickness（orDiameter）/mm

DeoxidizationMetod

ChemicalComposition（MassPercentage）/%,nothigherthan

C

Si

Mn

P

S

Q1