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1、1PROGRESSOFSTEELMAKINGTECHNOLOGYOFAUTOSHEETSATBAOSTEELZHIJianjunZHENGYiyuZHENGJianzhongJIANGXiaofang(BaoshanIronSteelCo.LTD.)ABSTRACTThepaperdiscussessteelmakingprocesstechnologyofautosheetsatBaosteel.Thecarbonnitrogento

2、taloxygencontrollevelsofIFsteelhaveacquiredgreatprogressbyoptimumofconverterprocessimprovementofRHequipmentoptimumofcontinuouscastingprocessmoldpowder.TheoutputofIFsteelreached1.5milliontonin2004.Theprogressoninterstitia

3、lfreesteelproductiontechnologyhasbecomethebasisofdevelopmentofautomobileindustryofChinarecentlyyear.KEYWDSIFsteelautomobilesheetsteelmaking1introduction05010015020025030035040045050019921993199419951996199719981999200020

4、0120022003Yearauto（104）30507090110130150autosheetoutput（104ton）automobileoutputofChinaautosheetsoutputofBaosteelFig.1DevelopmenttrendofoutputofautosheetofBaosteelautoofChinaTherapiddevelopmentofautomobileindustryrequired

5、highqualityironsteelproductitdroveironsteelenterprisestodevelopnewprocesstechnologytomeetthedemsofusagefautobody.especiallywiththedevelopmentofautoindustryofchinarecentlyyearthequantityrequirementsbecomegreatergreaterthe

6、qualityrequirementsbecomehigherhigherBAOSTEElbegantoproduceautosheetssince1990regardedautosheetsasstrategicproductsthedevelopmentofcleansteelIFsteelproductiontechnologybecamethebasisofstableproductionofautosheets.Figure1

7、showsthetrendofoutputofthehighqualityautosheetsautorecentlyyear.itcanbeknownthattheBaosteelautosheetsplayaveryimptantroleintherapiddevelopmentofautoindustryofChina.2SteelmakingprocessofautosheetsIFsteelhasbeenabroadappli

8、edinautoindustryastherepresentationofautosheetsthetypicalacteristicofIFsteelisinterstitialfreegooddeepdrawperfmance.thechemicalcompositionacteristicisultralowcarbonnitrogen(below40ppm)bigcoldrollingreductionratio.FIFstee

9、lthehighdeepdrawperfmancervaluedemlowcontentofcarbonnitrogentotaloxygeninsteel.ThecontentofcarbonnitrogenofIFsteelofBAOSTEELhasreachedtheinternationaladvancedlevel(below20ppm)bymanyyear’sstudy.BAOSTEELcanproducesteelshee

10、tsfromCQtoSEDDQnotonlymildIFsteelbutalsohighstrengthIFsteeltheprocessflowtofIFsteelisasfollow.HMpretreatmentBOFRHSLABCASTERHotmetalpretreatmentGenerallythesulphurphosphusisconsideredasharmfulelementstoberemovedfromsteele

11、speciallyfhighstrengthsteelsheetthecontrolofsulphurphosphusismestrictfdemsofweld.thesulphurphosphusisreducedinpretreatmentprocessby3Adynamicdecarbonizationmodelisdevelopedwhichcanpredictthecarbonconcentrationatdifferentt

12、imeduringRHtreatmentthemodelconsidersuchfactsascirculationvacuumdegreeliftgasflowratetopblowingoxygen.ContinuouscastingTheslabqualityisrelationtothesurfacequalityofcoldrollingstripcloselyBAOSTEELhavedevelopedthetechnolog

13、yofcleansteelcontinuouscastingincludedsealingcastingtundishfluidfieldoptimizationhighbasicitytundishfluxULCmoldpowderslabqualitymanagementmodelindertomeetthehighqualityneedofautosheets.Thesplashpadisdevelopedbystudyoftun

14、dishwatermodelexperimentcomputersimulationsofluidacteristicintundishisimprovedtheminimumstaytimecanbeincreasedup3050%thepeaktimecanbeincreasedup4070%thepistonflowratioisincreased.Theinclusionfloatingratioisincreasedup212

15、5%.Theadoptionoftundishfilterindammagnesiumcalciumcoatingimprovetheabsptionofaluminainclusion.ThehighbasicitytundishfluxdevelopedbyBAOSTEELhavegoodabsptiontoaluminainmoltensteelitimprovesthecleannessofsteelhavegoodinsula

16、tioneffect.Itisknownthatthecarboncontentinfluxcanresultinthecarbonpickupfmoltensteelintundishsothecarboncontentinfluxmustbecontrolledstrictly.TheFig.4istheapplicationresultofhighbasicitytundishfluxitcanbeshowedthatthehig

17、hbasicityfluxcanreducetotaloxygenofsteel.Fig.5showsthatcarbonpickupcanbereduced2ppmbyapplicationofhighbasicityflux.comparedwithiginalflux.1621263136414651560200400600800moltensteelpoured(t)totaloxygenintundish(ppm)R4Fig.

18、4RelationbetweenT.ObasicityofTDflux051015202530350200400600800moltensteelpoured(t)carbon(ppm)R4Fig.5InfluenceonCpickupofTDfluxtotaloxygen￡ppm￡?percent￡%￡?1201008060402001201008060402002015105020151050year199820012004Fig.

19、6TrendoftotaloxygenofIFsteelinrecentyearsThesteelcleannessisimprovedcontinuelybyoptimizationofBOFRHcontinuouscastingprocessfmanyyearFig.6showsthetrendoftotaloxygencontentintundish.Thetotaloxygenvariedfrom50ppmin1998to30p

20、pmin2004thedeviationoftotaloxygenisreducedsignificantly.ThecarboncontentofIFsteelwasimprovedsignificantlyfrom30ppmin1998to16ppmin2004byoptimizationofrefiningequipmentprocessimprovementofauxiliarymaterialofladletundish.(s

21、eeFig.7).thestabilityofcarbonisenhancedtoo.carbon￡ppm￡?percent￡%￡?42352821147042352821147010864201086420year199820012004Fig.7TrendofcarbonofIFsteelinrecentyearsTodecreasethecarboncontentinmoldpowderisoneoftheeffectivemet

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