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14220024JOURNALOFIRONANDSTEELRESEARCHVol.14,No.2===================================================================Apr.2002:(1977-),,;:2001-07-23;:2001-11-21,,(,100081):。γ→αα→γ,,。,,。、、、。:;;;;:TF777.1:A:1001-0963(2002)02-0059-05DevelopmentofThinSlabContinuousCasting-DirectRollingProcessandMicroalloyedHighStrengthSteelLIUSu,ZHANGHong-tao,WANGRui-zhen(CentralIron&SteelResearchInstitute,Beijing100081,China)Abstract:Theprocessofthinslabcontinuouscastinganddirectrollingisdifferentfromthetradi-tionalone.Thecontinuous-castingthinslabsdonotundergotwophasetransformationsofγ→αandα→γ.Thegrainsizeofaustenitebeforerollingiscoarsewhichisnotbeneficialtomicrostruc-turerefinementandpropertyimprovementofproducts.Beforetherolling,thedissolvedquantityofmicroalloyelementsisrelativelylargeandconsequentlytheprecipitationstrengtheningafterrollingishigher.Byoptimizingtheprocessparametersofrollingreduction,rollingspeed,rollingtemperature,coolingrate,andcoilingtemperature,thegoodstripproductswithbalancedproper-tiescanbeproducedbythinslabcontinuouscastingandhotstriprolling.Keywords:thinslab;continuouscasting-directrolling;microalloy;highstrengthsteel;processpa-rameter80。、、、、,。,,,:,,。(CSP)--(CompactStripProduction),,。1CSPCSP,1989。、、5～6。50～70mm,,,。,1.5h。1(-95-1Fig.1Layoutofthinslabcontinuouscasting-directrollingfacility)CSP[1]。2,-,,。,,、。,230mm90～300µm50mm50～120µm[2]。,,。。,,、,,,。,,,,,2[3]。,(TiN、NbCNVN),,;(NbC、NbCNVCN),。,,。。,2-Fig.2Time-temperaturecurvesofdirectrollingprocessandtraditionalone,。。CSP,,,,,。,。,、,γ→αα→γ,。,-06-200214(),,,,,、,,。A3A1,。(),,(),,,,。CSPX42,3(a),,C-Mn;3(b)CSPX52,X42,。X52,,、、。3X42(a)X52(b)Fig.3As-castmicrostructureofsteelX42(a)andX52(b),。CSP,[4]。,,,。,,。,CSP,CSPX52,、,CSP。3,,。。。3.1,,,。、。-16-2:4、,。,[5,6]。,(),。,。3.2γ→αα→γ,。,,,。,。,、,。,,Tnr,,γ→α。HSLA80,Tnr,[7],。,Tnr,,;,,840℃730℃,Ti-V-Nb[8～10]。(),。3.3200～300mm,50～70mm,3～5,。,γ→α,,。,。,,,。,,,TnrTnr,。,5～6。,。,。,,。,,,,。,Nb-Ti60%,,[11]。3.4,:,Ar3,,,;,VCNNbCN,。,。,10～30℃/s[9]。,。,,,[10,12]。HSLA80,500℃,640℃35℃/s,640℃,[9]。3.5,。、。,,-26-200214。,,。、、、、,。,,。4(1),,,,,,,。(2)γ→αα→γ,。,。(3)。。(4),,,。,。(5),,,10～30℃/s。:[1],.[J].,1999,(1):18-21.[2]FlemmingG.CSP[A]..[C].:,1991.273-285.[3].-Ti[A]..[C].:,1991.324-331.[4],,.[M].:,2001.[5]EhrenbergHJ.[A]..[C].:,1991.292-302.[6].[A]..[C].:,1991.310-316.[7]ChiangLK.DevelopmentandProductionofHSLA80ksi(550MPa)SteelsatGallatinSteel[A].LiuGuoquan,WangFuming,WangZubineds.HSLASteel'2000[C].Beijing:MetallurgicalIndustryPress,2000.319-325.[8]FlemmingG,HensgerKE.ExtensionofProductRangeandPerspectivesofCSPTechnology[J].MPTInternation,2000,(1):54-63.[9]LeeJL,YangCC,HsuanIC.EffectofProcessParametersontheMechanicalPropertiesofa45kgGradeC-MnHotRolledSteelSheet[A].ChandraT,SakaiT,eds.Thermec'97:InternationalConferenceonThermo-MechanicalProcessingofSteelsandOtherMaterials[C].Pennsylvania:Minerals,Metals&MaterialsSociety,1997.451-457.[10]SiweckiT,EngbergG,CuibeA.Thermo-MechanicalControlledProcessesforHighStrengthandToughnessinHeavyPlatesandStripsofHSLA-Steels[A].ChandraT,SakaiT.Thermec'97:InternationalConferenceonThermom-echanicalProcessingofSteelsandOtherMaterials[C].Pennsylvania:Minerals,Metals&MaterialsSociety,1997.757-763.[11]EssadiqiE,BaragarD,RuddleGE.DirectHotRollingofThinSlabsofTi-NbMicroalloyedSteel[A].ChandraT,SakaiT.Thermec'97:InternationalConferenceonThermo-mechanicalProcessingofSteelsandOtherMaterials[C].Pennsylvania:Minerals,Metals&MaterialsSociety,1997.579-585.[12]LiY,CrowtherDN,MitchellPS,etal.TheEvolutionofPrecipitationduringtheProcessingofThinSlabCastVanadi-umMicroalloyedSteel[A].LiuGuoquan,WangFuming,WangZubineds.HSLASteel'2000[C].Beijing:Metallurg-icalIndustryPress,2000.326-332.-36-2:4