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1、CASTINGDevelopmentandapplicationofdynamicsecondarycoolingandsoftreductionforslabcastingDynamicsecondarycoolingandsoftreductioncontrolmodelshavebeendevelopedforanewlycommissionedslabcastertoimprovethequalityofthecastslab.Thesystemcomprisesthreeparts:dynamicthermaltrackingmodel,dynamicspraywater
2、optimisationmodelandadynamicsoftreductioncontrolmodel.Thesystemhasbeenshowntobestableandrobustfortheproductionofshipplategradesand,followingfurthercalibration,willbeappliedtothewholeproductmix.Authors:YunheChang,KeLiu,ZhanguangHanandJiaquanZhangStateKeyLaboratoryofAdvancedMetallurgyandUniversi
3、tyofScienceandTechnology,Beijinghina’ssteelproducersarefacingaseriesofsevereCchallengesfromuserswhorequirehigherqualitysteels.Incontinuouscasting,internalcracks,centresegregationandcentreporosityareusuallythemainbottleneckspreventingdevelopmentofhigh-strengthsteelgradeswithqualifiedmechanicalpr
4、operties.Forthisreason,dynamicsecondarycoolingandsoftreductiontechnologyhavebeentwoofthekeytechnologiesadoptedbymanysteelplantsthroughouttheworldinthepastfewyearstoimproveslabquality.Incasting,theinterdendriticliquidsteelinthemushyzoneofthefinalsolidificationstageflowstothecentreareathroughconvec
5、tionandbulging.Thisleadstocentrelinesegregation.Thevolumecontractionofsteelonsolidificationcanalsoleadtocentralporositywherethereispoorfeedingorcompensation.Also,thecyclicalcoolingandreheatingofthestrandsurfacetemperatureduringcastingisconnectedwiththeformationofbroadfacecracking,subsurfacecrac
6、kingandotherdefects.Theappearanceandintensityofcentresegregationandcentreporosityorotherdefectsarecloselyrelatedtosteelgrade,liquidsteelsuperheat,castingspeedandcoolinghistory.Dynamicsoftreduction,combinedwithdynamicsecondarycooling,hasbeenshowntobeaneffectivewaytominimisecentresegregationandp
7、orosity.Inthispaper,anewlydevelopedthermaltracking,dynamicsecondaryrFig1Structureofdynamicthermaltrackingmodelcoolinganddynamicsoftreductionsystemforslabcastingcontrolisdescribed.DYNAMICTHERMALTRACKINGMODELAccurateandtimelyaccesstotheso
