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4111200611IronandSteelVol.41,No.11November20061,2,1,2,2,1,2(1.(),110004;2.,114021):,EDX,,,,,:;;:TG33:A:04492749X(2006)1120050203FormationandEliminationofRedScaleonHotRolledStripYUYang1,2,TANGShuai1,GUOXiao2bo2,GUANJu2,WANGGuo2dong1,LIUJie2(1.TheStateKeyLaboratoryofRollingandAutomation,NortheasternUniversity,Shenyang110004,Liaoning,China;2.HotRollingMillofAnsteel,Anshan114021,Liaoning,China)Abstract:Inordertoeliminatetheredscaleonsurfaceofhotrolledstrip,thedescalingandrollingexperimentsinlabandindustrialtrialswerecarriedout.Theevolutionofredscaleonhotrolledpieceduringdescalingandhotroll2ingwasanalyzedbySEMandEDX.Theformationmechanismofredscalewasdescribedandtheoptimizedhotroll2ingparameterswereproposed.Afteradoptingtheprocessrounteofdescalingandrollingathightemperatureandcoilingatlowtemperature,redscaleonsurfaceofproductwaseffectivelyremovedandproductqualityatAnsteelwasgreatlyimproved.Keywords:descaling;redscale;hotrolledstrip:(19702),,,;E2mail:yuyang@ansteel.com.cn;:2006204206(Fe2O3)[1],,,[2],(Fe2O3),,,,(Fe2SiO4),,[3],,,,11.1,240mm100mm100mm,(%):w(C)0.08,w(Si)0.43,w(Mn)0146,w(P)0.09,w(S)0.005,w(Als)0.035,w(Cr)0.36,w(Ni)0.15,w(Cu)0.321.2550mm,1250,90min;,,10MPa15MPa18MPa3,1150,100mm70mm40mm25mm;3,950,25mm16mm10mm7mm,880620,,+,,SEM11:22.111,,10MPa18MPa,40%2.210MPa25m,2(a),,,2(a)Fe/O,Fe1-xOFe3O4Fe2O3;,,,Fe2SiO4,FeFeO1Fig.1Relationshipofredscalecoveragerateanddesca2lingpressureFe3O44FeOFe+Fe3O4,,Fe[4]FeFe2O3,15MPa15m,2(b),,OFe2(a),Fe1-xOFe3O4Fe2O32(a),Fe1-xOFe2SiO4FeO,18MPa10m,2(c),Fe1-xOFe3O4Fe2O3;FeO,Fe2(c),Fe2SiO4,SiO2CrMnNi,,Ni,/CrMn,EDX,CrMn,3(a)10MPa;(b)15MPa;(c)18MPa2Fig.2Line2scanningresultsofdistributionofelementsincross2sectionofoxideunderdifferentdescalingpressure,SEM1541(a);(b)EDX3EDXFig.3OxideinclusionsinmetalandEDXresult2.3Fe2SiO4Fe2SiO41173,1220,FeO+Fe2SiO4Fe2SiO4FeO,FeO/Fe2SiO4,,FeO,FeOFeO,,Fe2O3[5]4,,FeO,Fe2SiO4,,117333.1,Fe2SiO4FeO,18MPa,,,,18MPa,12301300,4Fig.4Evolutionofredscale1173,Fe2SiO4FeO,FeO,,1100,960980,820840,,1015/s,6506303.2,,,4(1),,10MPa18MPa,40%,,(2)Fe2SiO4,,1173(3)FeOFeO,,(4),,:[1]WolfMM.ScaleFormationandDescalinginContinuousCast2ingandHotRolling[J].IronandSteelmaker,2000,(2):65266.[2].[J].,2003,(4):54258.[3].1700(ASP)[J].,2003,38(7):8.(LIUJie.EngineeringandProductionPracticeofAngangs1700mmMediumThicknessSlabContinuousCasting2RollingLine(ASP2AngangStripPro2duction)[J].IronandSteel,2003,38(7):8.)[4]ChenRT.Oxide2ScaleStructuresFormedonCommercialHot2RolledSteelStripandTheirFormationMechanisms[J].Oxida2tionofMetals,2001,56(1):892115.[5]TomokiF.MechanismofRedScaleDefectFormationinSi2AddedHot2RolledSteelSheets[J].ISIJInternational,1994,34(11):9062911.25