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10219984JOURNALOFIRONANDSTEELRESEARCHVol.10,No.2Apr.1998CleanlinessofMoltenSteelinContinuousCastingTundishZhangLifengXuZhongboZhuLixinCaiKaikeFeiHuichunLiYasongWangXizhangMouJining:(BeijingUniversityofScience&Technology)()(BaoshanIron&SteelGroup):,,(100083),()60t,,,;SiO2MgO2CaO;(35)10-4%,KE,,,,,ABSTRACTBysystematicalsamplingduringoperation,theeffectofflowcon2trol,flux,refractoryliningandprotectivecastingonmoltensteelcleanlinessintundishofBaoshanIronandSteelGroupisdiscussedinthispaper.Withproperlypositionedweir,damandfilterintundish,theinclusionremovalisimproved.Theuseofcoverpowderwithhighbasicity,lowSiO2contentandMgO2CaObasedlin2ingrefractoryisfavourabletosteelcleanliness.Protectivecastingisanotherwaytoreducenitrogenpick2upto(35)10-4%intundish.The32dimensionvelocityfieldofthemoltensteeliscalculatedwithK2Emodelandtheeffectofflowcontroldeviceoninclusionremovalisanalysed,whichprovidesfurtherproofsforimprov2ingsteelcleanlinessintundish.KEYWORDStundish,moltensteel,cleanliness,mathematicalmodel,[13],[46],,(,)T[O]3010-4%,;T[O]5510-4%,;T[O](3055)10-4%,[7]()()60t,,©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(Slims)50Lm,,1.2KE,,CHAMCFDPHOENICS,IBM586:,;,;,,;,;,22.1:ttf(1)t=WöQ;tf=Hövs;vs=(QF-QP)gD218L;t,min;tf,min;W,t;Q,tömin;vsStokes,cmömin;QF,QP,göcm3;L,kgö(ms);D,Lm;g,9.8mös2;H,cm(1),,,(1)1,67Lm,67Lm,(1),1Fig.1Relationbetweenfloatationtime,floatationvelocityanddiameterforinclusion,,,,,6080t[8]2.270,,80,,,2,,[2(a)],,,;[2(b)],,,;[2(c)(d)]2(c)2(d)0110©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a),(b);(c),(d)1ö4(a);(b);(c);(d)Fig.2Velocityfieldintundishlength(d)CaO2(c)2(d):,;,,3,T[O]G3A;B;CFig.3Effectofflowcontroldevicesoninclusionremoval,A,T[O]80%54%25%;,C,10%,AB,20%2.3(CaOöSiO2=01),,,Al2O3,T[O](4)(CaOöSiO2=0.02),Al2O3,T[O],,,,,Al2O3,,,(,CaOöSiO2=1.0),80%54%25%(2,10),40minAl2O320%40%[2],35minAl2O315%112:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:3(SiO2)+4[Al]=3[Si]+2(Al2O3)(2)[Al],Al2O3,(2),1,SiO21Table1Effectsoftundishfluxbasicityandliningrefractoryonreoxidationofmoltensteel00.261.031.03$[Si]ö10-4%$[O]ö10-4%5057.14045.72730.86169.7;2.4,,[9],,(1025)10-4%,(35)10-4%,,,1,,,2.5,,,,,(80%MgO,10%CaO),,(1)3410-4%,38.910-4%(1),,13mm,Al2O3SiO22,,Al2O3,Al2O3,15%,SiO2,,SiO2(2),2Al2O3SiO2ö%Table2Al2O3andSiO2contentsintundishliningö%SiO2Al2O37.170.7912.675.5912.9638.373(1)(2)SiO2,(3),(35)10-4%(4)2110©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(19971121)1McleanA.TheTurbulentTundish2ContaminatororRefiner.In:NanneGAed.1988SteelmakingConferenceProceedings.Toronto:1988.32StelJVD,BoomR.ThermophysicalandKineticConsidera2tionsfortheSelectionofaTundishFlux.In:RoteFEed.1993SteelmakingConferenceProceedings.Dallas:1993.5033BesshoN,YamasakiH,FujiT.ISIJ,1992,32(1):1574SzekelyJ,TrapagaG.MathematicalModelsofFluidFlowPhenomenainTundishOperations.In:2ndEuropeanCon2tinuousCastingConference.Dusseldorf:VereinDeutscherEisenhuttenlente,1994.795LaiKYM,SalcudeanM,GuthrieRIL.Met.Trans.,1986,17B(9):4496,SahaiY.,1988,24(2):B797SchadeJ,BurnsMT,NewkirkCC,BrownWA.SteelTech2nologyInternational.1993.1498..(143),:,1992.1699..:,1992.16Co-Cr-MoAlloyJointProsthesis,1971ASTM7576:150,,,,JSJM,,404244464850mm6,19848312:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.