High temperature oxide scale characteristics of low carbon steel in hot rolling.pdf

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1、JournalofMaterialsProcessingTechnology155156(2004)13071312HightemperatureoxidescalecharacteristicsoflowcarbonsteelinhotrollingWeihuaSun∗,A.K.Tieu,ZhengyiJiang,ChengLuFacultyofEngineering,UniversityofWollongong,North-fieldsAvenue,Wollongong,NSW2522,Austra

2、liaAbstractInthispaper,hotrollingtestsoflow-carbonsteelwerecarriedoutona2-highHille100experimentalrollingmillatvariousspeedsandreductions.Therollingtemperatureswerebetween1000and1030◦C.Nitrogenprotectionwasusedtocontrolthescalethicknesswhenthetestsample

3、swereheatedinthefurnaceandcooledinacoolingbox.Therollingforces,rollingtorquesandscalethicknessesbeforeandafterrollingweremeasured.SurfacecharacteristicsofthesteelsampleswereanalyzedwithSEMandAtomicForceMicroscope(AFM).X-raydiffractionwasperformedtochara

4、cterizethephasecompositionofthescalelayers.Theeffectsofscalethicknessonrollingforceandtorquewerealsoinvestigated.©2004ElsevierB.V.Allrightsreserved.Keywords:Hotrolling;Oxidescales;Surfaceroughness1.Introductionrangeof8301150◦C.YuandLenard[9]estimatedthe

5、re-sistancetodeformationofthescalelayerduringhotrollingAscalelayerisalwaysformedonthestripsurfacedur-ofcarbonsteelstrips.inghotrollingprocessonahotstripmill.PrimaryscalesHowever,littleisknownhowthesurfacetextureistrans-formedonthesurfaceofslabsintherehe

6、atingfurnaceferredfromonepasstothenext.Ithasbeensuggestedthatareremovedbydescaler.Secondaryscalebuildsupagainthetextureisestablishedbytheworkrollsurfaceroughnesswhentheslabiswaitingforfurtherprocessingbeforeeachduringtherollingprocess[10].Inthecaseofhot

7、rolling,thepassandbeforeenteringthefinishingstands.Furthermore,actualsurfacetextureisgeneratedbyacombinationofthetertiaryoxidationscalelayerdevelopsaftertheslabisasperitycontactandthelubricantcontactbetweenthestriprepeatedlydescaled.Thus,theroll/stripint

8、erfaceinhotandtheroll.Itwasassumedthatthescaleiscompressedandrollingalwaysincludeslayersofscale.Whenthescaleisbeginstobeelongatedwhenitenterstherollbite[11].Whensubjectedtorollingintherollbite,itcanactasalubricanttheoxidescalefra