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CSPSPHCSS400____________________________________________________CSPSPHCSS400___________________________________________________________________________2007031S20040644TG142.1_________________________2007031CSPSPHCSS400CSPSPHCSS400ResearchonProcessingControlandtheMicrostructureofSPHCandSS400SteelbyCSP100083CandidateZhengBinhuaSupervisorKangYonglinSchoolofMaterialsScienceandEngineeringUniversityofScienceandTechnologyBeijing30XueyuanRoadHaidianDistrictBeijing100083P.R.CHINA_________________________________________________________-I-CSPSPHCSS400CSPSPHCSS400CSPSPHCSS400TiCuSPHCSS400SPHCSS400SPHCSS400CSPSPHCSS400SPHCSS400-II-ResearchonMicrostructureandPropertyofSPHCandSS400byCSPAbstractThefundamentaltestandtheoreticalresearchontherelationshipofmanufacture,microstructureandpropertyoftransformationwhichofferanexcellentcombinationofstrengthandductilityforapplications,hadbeencarriedoutbyinternationaladvancedthinslabcastingandrollingprocessingtechnology,tooptimizethetechniqueofproductionoftheSPHCandSS400producedbyCSPcompactstripproductionandimprovethemechanicalproperty.Bythelabstudiesandfieldsexperiments,mainprogressandinnovationshavebeenmade.FielddataabouttheproductionofSPHCandSS400fromCSPfactoryinHandanironandsteelCo.,LtdhadbeenanalyzedtoensuretheinfluenceandtheregularityofthenormalelementsinSPHCandSS400.Precipitatesandinclusionshadbeenobservedandanalyzedtoensurethecomponentandthereasonsoftheformation.TheinfluenceoftheprecipitatesandinclusionswhichhavetheelementsTiandCuhadbeendiscussedinthisdissertation.ThecharacteristicsofmechanicalpropertiesandmicrostructureoftheSPHCandSS400wereconcluded.Theregularityofmicrostructureevolvementhadbeenensuredtoguidetherollingprocess.ThehotdeformationbehavioroftheSPHCandSS400wereinvestigatedbysinglecompressiontestinthermo-mechanicalsimulator.Therelationshipsofthedeformationtemperature,strainrate,deformeddegreeanddeformationresistancewereanalyzed.Themathematicalmodelofdeformationresistancewasregressedandtallieswiththeexperimentaldata.Threetimesfieldexperimentstheoptimizedtherollingprocesstoincreasethestabilityandpercentofpassoftheproduction.Aintegrationcontroltheorywasestablishedinrelationshipofelementcomposition,process,microstructureandmechanicalpropertyinSPHCandSS400producedbyCSP.Bytheresearch,thepropermetallurgycomponent,rollingprocesshadbeenobtained.KeyWordsthinslabcastingandrolling,lowcarbonsteel,Microstructureandproperty,deformationresistance-i-..................................................................................................................................1Abstract.....................................................................................................................................II1..............................................................................................................................11.1.........................................................11.1.1................................................................................11.1.2...............................................................21.2.........................................................41.2.1CSP..........................................................................................................41.2.2ISP...........................................................................................................41.2.3TSRCONROLL...............................................................................41.2.4...............................................51.3CSP......................................................................................................71.4SPHCSS400............................................................................................81.5......................................................................................91.5.1.........................................................................................................91.5.2..........................................................................................102SPHCSS400............................................112.1.................................................................................................112.2....................................................................................112.3.........................................................................................182.4............................................................................202.5.................................................................................................................273SPHCSS400...................................................293.1SPHC.................................................................293.1.1.......................................................................................................293.1.2CCT.......................................................30-ii-3.1.3..............................................................................323.2SS400................................................................