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1、DevelopmentApplicationofProcessModelingTechnologyf2050HotStripRollingMillatBaosteelLiuZhengdong1TangGuangbo1ChengJiefeng1GanYong1WangWei2ZhangPijun2(1.ISMCentralIronSteelResearchInstituteBeijingChina1000812.TechnicalCent
2、erBaoshanIronSteelGroupCpationShanghaiChina201900)Abstract:Anintegratedprocessmodelingsystemhadbeenbuiltinwhichthermalmechanicalmetallurgicalprocessesduringhotstriprollingwerenumericallycoupledtogether.Thestructureofthep
3、rocessmodelswasbrieflyintroducedinthispaper.Thedevelopedprocessmodelscanbeusedtosimulatethethermalmechanicalmetallurgicalprocessesevolutionsofthewholehotrollingprocessfromreheatingfurnacetocoolingaftercoilingtopredictthe
4、mechanicalpropertiesofthefinalproductofthe2050hotstriprollingmillatBaoSteel.Thesystemwasverifiedoptimizedagainstmethan1000industrialcoilsofabout10steelgradesrunsonlinesuccessfully.Thedifferencebetweenpredictedmeasuredtem
5、peraturestrengthis20℃(online)21MPa(offline)respectively.Keywds:hotstriprollingprocessmodelingmicrostructureevolutiononlineapplicationIntroductionTheprocessmodelingtechnologyfsimulatingmicrostructureevolutionspredictingme
6、chanicalpropertiesoffinalproductsfhotstriprollinghasbeenwidelystudiedsince1970shasbeensuggestedasausefulapplicabletechnologyinmodernsteelproduction[1].Itemployedknowledgeoverseveralfieldssuchasheattransferplasticmechanic
7、sphysicalmetallurgymathematicalmodelingcomputerapplicationautomationtechnologyetc.ItisreptedthatseveralhotrollingprocessmodelingsystemseitherofflinesystemsonlinesystemshadbeenappliedinsomehotstriprollingmillsinNthAmerica
8、Europe[23].ResearchesapplicationsofsuchintegratedpredictionsystemarecommencedalittlelaterinChinathaninthosedevelopedcountries.HoweverunderthesponssoftheNationalScienceFoundationofChina(NSFC)researchgroupsfromCentralIronS
9、teelResearchInstitute(CISRI)NtheastUniversity(NEU)BaoshanIronSteelGroupCpation(Baosteel)havecollabativelydevelopedanintegratedprocessmodelingsystemnamedQHSMafterseveralyearsofhardwk.Currentlyacceptablepredictionaccuracyo
10、fQHSMhaveachievedafterlongperiodofflinetrainingmodificationofthesystemusingindustrialdata.Thepredictedstrengthvaluesofabout10steelgradesagreewellwiththemeasuredvalues.FurthermeonlineapplicationhasalsobeenimplementedatBao
11、steel2050hotstriprollinglinesuccessfullytheresultsalsoshowedthatboththepredictedtemperaturerollingloadvalueshavegoodagreementswiththeirmeasuredvalues.tabledowncoilersfstripcoolingcoilingrespectively.Theflowofcalculationo
12、fQHSMconfmstothehotmetalflowasshowninFigure2.Whenthoseinputdatasuchassteelgradeschemicalcompositionsdimensionsofslabstripgaugemillconfigurationreheatingrollingcoolingconditionsetc.aregivenQHSMcanstartitscalculationcalcul
13、ateallevolutionprocessesonebyonetillthefinalmechanicalpropertiesarepredictedout.TherearelotsofresultsinQHSM’soutputlistsamongwhichthemostimptantusefulonesinclude:mechanicalpropertiestemperaturedistributionchangesrollingl
14、oadsthosequantitivedeionsofallkindofmicrostructureevolutions.InputDataSteelgradeconditionofreheatingrollingcoolingslabsizefinalsizemillconfigurationsetc.?Slabtemperature?Austenitegrainsize?Temperatureofrolledmaterials?Ro
15、llingloadsstrainstrainrateetc?Austenitegrainsize?Temperatureofstrip?Phasetransfmation?Precipitation?MechanicalpropertiesReheatFurnaceRougherRunoutTableDownCoilerFinisherFigure2SchematicillustrationofQHSMthelayoutof2050mi
16、ll2.DevelopmentofQHSMatBaosteel2050hotstriprollingmillBecauseofthethickerslabverticalstsinroughrollingareaatBaosteel2050millboththeheattransferalongslabwidthdirectionthewidthreductioninverticalrollingstswouldbetternotbei
17、gned.Thusthe2dimensionalthermalmechanicalmodelsaredeveloped.Fthethermalmodelthedeterminationofheattransfercoefficientsunderdifferentboundaryconditionsisonethemostimptantissues.Severalempiricalequationsofheattransfercoeff
18、icientsusedfallkindsofheattransferconditionsduringhotstripproductionareemployedareoptimizedbytuningparametersthroughapplyingthesemodelstocalculatemethanthousindustrialcases.Similarlysomemetallurgicalbasedempiricalmicrost
19、ructureevolutionmodelsfsimulatingallkindsofmetallurgicalprocessesduringhotstriprollingsuchasgraingrowthdynamicmetadynamicstaticausteniterecrystallizationgrainsizeaftergrainrefinementphasetransfmationprecipitationetc.area
20、doptedoptimizedintheintegratedmodelingsystemaswell.Toachievehighaccuraciesinpredicatingthemechanicalpropertiesofthefinalproductsartificialneuralwksdatabasetechnologiesareadoptedwhichcanautomaticallyoptimizethemicrostruct
21、urepropertiesmodelsthroughcasestudiesaftercalculationhundredsofcoils.TherefeQHSMfeaturesthecapacitiesofaccuracyflexibilityhighcalculationspeed.Asseveralpapersaboutthedevelopedmodelingsystemhavebeenpublishedbytheauthsprev
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