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.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
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