中外碳素结构钢对照翻译.docx

中外碳素结构钢对照翻译.docx

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中外碳素结构钢对照翻译

ThecomparisonofchemicalcompositionandphysicalpropertyofcarbonstructuralsteelmanufacturedinChinaandBritain

1.　Generalintroduction

1.1　Manufacturingofcarbonstructuralsteelhasmorethan80yearshistoryinChina.ItwassmeltedbyMartininitiallyandthenbyconverterorelectricalfurnace,convertersteelisdevelopedfromsideblownconvertertooxidativeconverter..Ingeneral,Chinahasalreadyaccumulatedmaturesmeltingoperationexperienceandqualityoftheproductshasbeengoodenoughtocomparewithforeigncorrespondingsteelgrade.Forexample,bothphysicalpropertyandchemicalcompositionofsteelQ235（madeinChina）wassimilarwithforeignproducts,suchassteelA36（madeinUSA）,steelCT-3（madeinRussia）,steelSS41,SM41（madeinJapan）,steel43A-C（madeinBritain）,steelFe360（madeinEurope）,steelST-37（madeinGermanyandAustria）.

2.　GeneralsituationofcarbonstructuralsteelinChina

2.1　Accordingtothedifferenceofcarboncontent,carbonstructuralsteelcanbeclassifiedintolowcarbonsteel,mediumsteelandhighcarbonsteel.Generallyspeaking,theonewith0.03%～0.25%carboncontentiscalledlowcarbonsteel;theonewith0.26%～0.60%carboncontentiscalledmediumsteel;theonewith0.60%～2%carboncontentiscalledhighcarbonsteel.Inbuildingstructure,lowcarbonsteelischieflyused.

2.2　Carbonstructuralsteelisextensivelyusedduetoitwaseasytosmelt,withlowcostandvariousgoodhandlingcharacteristics.SteelQ235hasabetterperformanceinstrength,machiningandweldingproperties.Itisfrequentlyusedinindustryandcivilarchitecture,anditisalsothelarge-tonnagesteelgrademanufacturedinChina.

2.3　Classificationandpropertyofcarbonstructuralsteelisshownasfollowing:

2.3.1　InGB/T700-88“carbonstructuralsteel”,accordingtocarbonandmanganesecontentandyieldpointgrade,andthehierarchyarrangedfromlowtohigh,Carbonstructuralsteelisclassifiedintofivegrades.Therearealsoqualitygradesclassifiedinmostgradesandeachgradehasspecifieddeoxidationmethod.Detailedseetable2-1.ThemostcommonusedoneisSteelQ235.

Carbonstructuralsteelgrades

Table2-1

Steelgrade

Qualitygrade

Deoxidationmeasures

Declaration

Q195

-

F、b、Z

Steelgradeiscomposedoffourpartsinsequenceas:

letterrepresentedyieldpoint,numericvalueofyieldpoint,qualitygradesymbolsanddeoxidationmethod.

Forinstance:

DefinitionofeachsymbolinQ235-B-Fis:

Q-firstletterinChinesephoneticof“yieldpoint”（屈）

A,B,C,Dindividuallyisqualitygrade

F-firstletterinChinesephoneticof“boilingsteel”（沸）

B-firstletterinChinesephoneticof“semikilledsteel”（半）

Z-firstletterinChinesephoneticof“fullkilledsteel”（镇）

TZ-twolettersinChinesephoneticof“speicalfullkilledsteel”（特镇）

Q215

A

F、b、Z

B

Q235

A

F、b、Z

B

C

Z

D

TZ

Q255

A

Z

B

Q275

-

Z

2.3.2Carbonstructuralsteelissmeltedbyoxidationoven,Martinorelectricalfurnace,unlessspecialrequirementfromdemandingparty（markedincontract）,smeltingmethodisgenerallydeterminedbysupplier.

2.3.3Carbonstructuralsteelisgenerallydeliveredunderhotrolling（includingcontrollingrolling）conditionaccordingtodemandingparty’srequirement,throughagreementofbothsides,itcanalsobedeliveredundernormalizingtreatmentcondition（exceptforgradeAsteel）

2.3.4RolldownvariousgradeBsteelwithboilingsteel,itsthickness（diametral）isgenerallynotmorethan25mm

2.3.5Carbonstructuralsteel’schemicalcomposition（meltinganalysis）shouldcomplywithspecificationintable2-2.

2.3.6Carbonstructuralsteel’smechanicalpropertyshouldcomplywithspecificationintable2-3（tensileandimpacttest）andtable2-4（coldbendtest）.

2.4Intensileandimpacttest,samplesofsteelplateandbandshouldadoptfromthecrosssection,elongationof1%lowerthantable2-3isallowed;samplesofstructuralsectionshouldadoptfromlongitudinaldirection.

2.5ColdbendtestofvariousgradeAsteelshouldbeproceededwhendemandingpartyrequires.Whencoldbendtestisqualified,theupperlimitoftensilestrengthisnoneedtobeasoneofthedeliveryconditions.

Carbonconformationsteel’schemicalconstitution

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Table2-2

Steelgrade

Qualitygrade

Chemicalconstitution％

Deoxidationmethod

C

Mn

Si

S

P

Nogreaterthan

Q195

－

0.06～0.12

0.25～0.50

0.30

0.050

0.045

F、b、Z

Q215

A

0.09～0.15

0.25～0.55

0.30

0.050

0.045

F、b、Z

B

0.045

Q235

A

0.14～0.22

0.30～0.65

0.30

0.050

0.045

F、b、Z

B

0.12～0.20

0.30～0.70

0.045

C

≤0.18

0.35～0.80

0.040

0.040

Z

D

≤0.17

0.035

0.035

TZ

Q255

A

0.18～0.28

0.40～0.70

0.30

0.050

0.045

Z

B

0.045

Q275

－

0.28～0.38

0.50～0.80

0.35

0.050

0.045

Z

Notes:

①　Theuppercontentl