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(),[C]012%Mn(eq)=[Mn]+[Cu]+[Cr]+0167[Si]+2[V]+1133[Mo]+0133[Ni]+100[B]2180,(CCT),01021/s,VHN275280,(10VHN),,400mm,DevelopmentofLarge2sizedNon2quenchedand2temperedBaniticSteelforPlasticMouldJiangLaizhuWangXishunWangJianhui(ShanghaiBaosteelResearchInstitute)ABSTRACTTheeffectofcarbonandalloyingelementsonthebainitictransformationandthecor2respondinghardnessofsteelsforplasticmouldunderbothairandsandcoolingconditionswasinvestigat2ed.Itwasdemonstratedthatthekeyelementstoensurethefullbainitemicrostructureunderbothcondi2tionsareasfollows:[C]0120%,Mn(eq)=[Mn]+[Cu]+[Cr]+0167[Si]+2[V]+1133[Mo]+0133[Ni]+100[B]21801Thecontinuouscoolingtransformationcurveforthesteelwiththecarbonandalloyingcontentsjustwithintheabovelimitwasmeasuredandthecorrespondingmicrostructureandhard2nesswerestudied.Itwasshownthatthemicrostructureisfullbainiteandthehardnessisbetween275VHNand280VHNwithlittlevariationunderawiderangeofcoolingrate,0.021/s.Theindustri2altrialproductionresultshowsthatthehardnessthroughthewholesectionof400mmthicknessoftheplatemadeofbainiticmicroaollyedsteelisdistributeduniformly.KeyWordsBainiteSteelforplasticmouldHardness1,1965199056648713201900VHN180220,VHN270320S48C255CP20(P20+Ni),[1],2219996©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()VHN270320,()(),,(),,CCT,,,400mm2:(1)(500mm);(2)(500mm),[2]:C:,,,,C0115%0130%Mn:115%,,Mn115%215%V:V/,,VV0120%,V0105%0120%Mo:Mo,0150%,,Mo0110%0150%B:(),Mo010050%,,B010005%010050%Ti:N,TiN,,,BN,BNTiN,,Ti/N=34,P,SCa,P:,P0105%,,P0105%S:,S0105%,,S0105%Ca:,,,010080%Ca,Ca010010%010080%3250kg100kg(16)(711),1,Ti455mm,,,,,,32©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(01025/s),1%CMn(eq)3101172171201182147301162148401182142501222196601202165701172183801173130901162191100118218911011821873:Mn(eq)=[Mn]+[Cu]+[Cr]+0167[Si]+2[V]+1133[Mo]+0133[Ni]+100[B][3]44111,No15No15,VHN275280;412281,2,3,461,6,5;1,2,3,46+;10++,79(+),+;8(40%)++,+;11,(70%)++(a),500(b),500254219996©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a),200(b),20036(a),500(b),20047(a),200(b),2005852©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a),500(b),20069(a),500(b),200710(a),500(b),2008115511,,6219996©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(eq)=[Mn]+[Cu]+[Cr]+0167[Si]+2[V]+1133[Mo]+0133[Ni]+100[B][3]9(a)(b)9,:[C]0120%,[Mn(eq)]2180%512CCT5CCT(10),,01021/s(100102/s105CCT72©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),11,,01021/s,,VHN275280[4],0102/s500mm,015/s,500mm51156,(B30),400mm,12,13,12P20+Ni400mm12400mmB30,,713400mm(40)8219996©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1),;(2)T,,;(3),,52,;(4),,1,,1T1,1998;33(5):242,,11,1999;(2):273PatankerSV.NumericalHeatTransferandFluidFlow.NewYork:HemispherePub.Corp.,19804HeYandSahaiY.TheEffectofTundishWallInclinationontheFlu2idFlowandMixing:AModelingStudyMetall.Trans.,1987;B(18B):81(1999810)(28),[C]0120%Mn(eq)2180,(CCT),01021/s,VHN275280,400mm,:,,,1,,11,1998;(6):54582PickeringFB1PhysicalMetallurgyandDesignofSteels.London:Ap2pliedScieneePublisher,19713ltoYandBessyoK.TheSumitomoResearch,1969;(5)4,121:,1988:309(1999525)0419996©1994-2011ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.