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ML08Al150mmx150mm01401083t83tLF66150mm×150mmML08Al%≤0.08C0.20～0.50Mn≤0.06Si0.02Al43%Al13%Mn2%Ti0.02%～0.09%0.01%CaS400kgLF≤0.06%150mm×150mmML08AlProductionPracticeof150mmx150mmConcastingBilletofSteelML08AlGuoPingZhengYingandShiYuhongSteelmakingPlantBaotouIronandSteelCorpBaotou014010AbstractThelowcarbonlowsiliconaluminumkilledsteelML08Al%≤0.08C0.20～0.50Mn≤0.06Si0.02Alwasproducedby83ttop-bottomcombinedblownconverter-83tladlefurnace-6strand150mm×150mmbilletconcasterprocessatBaotouSteel.Theoperationpracticeshowedthatthealuminumcontentinsteelwasregularly0.02%～0.09%by43Al-13Mn-2TialloydeoxidationduringtappingofconverterinsteadofAlbrickthenozzlecloggingwasavoidedassulphurcontentinsteelwaslessthan0.01%todecreaseamountofCaSformedinmoltensteelandtheresiliconamountdecreasedbydecreasedownslagamountandadding400kglimeintappingofconverterandregulatedeoxidationreagentaddingamountandtimetoensuresiliconcontentinsteelnomorethan0.06%.MaterialIndex150mm×150mmBilletSteelML08AlConcastingProcessPractice1ML08Al%≤0.08C≤0.06Si0.20～0.50Mn≤0.030P≤0.035S0.02Al83t-LF-83tLF661LF21LFTable1MaintechnologyparametersofLF/t83/mm3240/mm870/MVA16/℃min-1420.01%～0.04%2Table2Maintechnologyparametersofbilletconcaster/t18/mm×mm150×150/m744/m1.05/mmin-13/m12/m13M-EMS/%8520/min35/ta-19012kg0.005%～0.130%ML08Al15273Vol.27.No.320065═════════════════════════════════════════════════════════════SPECIALSTEELMay200643%Al-13%Mn-2%Ti6kg/t0.02%～0.09%3LF4min75%～85%Al2O3CaO2Al2O3CaO6Al2O3CaOAl2O3MgOAl2O3CaS200524343ML08Al/%Table3ChemicalcompositionsofsteelML08Alheatsoc-curredtundishimmersednozzleclogging/%CSiMnPSAltCa1005550.090.030.4200.0100.0190.0570.00464003150.060.010.3900.0210.0320.0310.00291005560.060.010.0390.0210.0320.0310.00504003170.090.010.0470.0220.0230.0400.00231Al2O32CaS4Ca-Fe400～500mAl2O3Al2O33CaFeCaSCaS28ML08Al482tML08Al44ML08AlTable4ChemicalcompositionsofsteelML08Alheatsnon-occurredtundishimmersednozzleclogging/%CSiMnPSAlsAltCaCa/Al4003350.050.030.460.0160.0090.0280.0310.00500.164003360.070.060.540.0190.0040.0310.0330.00460.145006360.100.080.520.0140.0070.0490.0530.00700.134003370.070.020.420.0140.0210.0340.0420.00400.104003380.050.020.430.0210.0060.0280.0310.00670.224003390.070.020.440.0090.0120.0450.0490.00630.135006380.070.010.350.0120.0180.0230.0360.00370.104003400.070.070.490.0210.0080.0290.0410.00400.10LF4Al+3SiO2=3Si+2Al2O312400kgSiO23LF2005344115155ML08AlSiTable5DistributionofsiliconcontentinmoltensteelML08AlforbilletconcasterSi/%550.01～0.04400.04～0.0650.0641ML08Al0.01%2Al1971-20012005-12-092527═════════════════════════════════════════════════════════════