简介：Thispaperpresentedtheapplicationofthedirecthotchargerolling(DHCR)technologyinNingboSteel.Fiveaspectshavebeensystematicallyaddressedandanalyzed,whichincludesalesorder,productionscheduleprogramming,steelmaking,continuouscastingandhot-rolling.TheaverageDHCRproductratehasreached55%andtheaverageslabchargingtemperature699℃.Asaresult,theproductioncost,theenergyconsumptionandtheCO2emissionhavebeensignificantlyreduced.ItisconcludedthatabreakthroughinapplicationoftheDHCRtechnologyhasbeenachievedatNingboSteel.

简介：Baosteel'ssteelmakinghasdevelopedgreatlyoverthelast30yearsintheareasofhotmetalpretreatment,converter,electricarcfurnace(EAF),secondaryrefining,continuouscasting,stainlesssteelandthecomprehensiveutilizationofresources.Thedevelopmentoftechnologies,suchascleansteelproduction,ruhrstahlheraeus(RH)vacuumrefining,abreakoutpredictionsystemforslabcontinuouscastingandrotarycylinderslagtreatmenthascreatedagoodenvironmentforthedevelopmentofvalue-addedproductsandthecomprehensiveutilizationofresourcesatBaosteel.ThispaperdescribesthedirectionofdevelopmentofBaosteel'ssteelmakinginthefuture.

简介：OxidemetallurgytechnologyhasbeendevelopedatBaosteelforimprovingtheheataffectedzonetoughnessofsteelplatesforhighheatinputwelding.AfterdeoxidationwithstrongdeoxidizersofMgalloy,thecomplexinclusionscontainingpartsofcompoundsofMgO,Ti2O3,MnO,Al2O3,MnS,CaSandTiNareformed.Thesekindsofinclusionsarebeneficialforpromotingtheformationofintragranularferrite.Aftertwo-electrodevibratoryelectrogasarcweldingwiththeV-typegrooveandahighheatinputof395kJ/cminasinglepass,theformeraustenitegrainisveryfineinsize,withanaveragegrainsizeofonly85μm.Excellentheataffectedzonetoughnessisobtainedforthedevelopedsteelplateswithathicknessupto68mm.

简介：Thispaperdescribesthebenefits,technicaldifficultiesanddisadvantagesofthecurrentheavyreductionsolutionsforplateproduction.Forupdatedplatemills,thispapergivesabetterideafortheheavyreductioncontrolintherollingprocess.Thatistokeepthereductionamountconstantinthefront-endandback-endsectionsoftheplateandtoadopttaperedrollingwithvariablereductioninthemiddlesectionoftheplate.Thissolution(alreadyappliedforapatent)cannotonlyfullyutilizethecapacityofthemillmotors,butalsopreventdifficultiesinplatebitingcausedbytheconventionalheavyreductionsolutionswithexcessivedraft.Thistechnicalsolutionhasbeenimplementedatthe5mplatemillplantofBaosteel,andindustrialtestshaveprovedthefeasibilityofit.Thispaperpresentsandanalyzestheindustrialtestdataandprovesthatthetaperedheavyreductiontechnologycanreducethenumberofrollingpasses.Inaddition,thispaperlooksforwardtothefutureresearchinthisarea.

简介：Throughout30yearsofimportation,adoptionandinnovation,theColdRollingPlantofBaosteelhasadheredtoamarket-orientedstrategy,andgraduallyexpandeditsoutputandraiseditstechnicallevelthroughtheexpansionofproductionscale,theoptimizationofproductionlines,thedevelopmentofhighaddedvalueproducts,theimprovementofproductquality,environmentallyfriendlymanufacturingandtechnologicalinnovation.Inthisway,theplanthasdevelopedintoaworldclasscoldrollingplantthatproducescutting-edgeeconomicandtechnicalindices.

简介：Sincetheearly1990s,thevolumeofdomesticautomobileproductionhasdevelopedrapidlyinChina.ThisyearChinahasbecome

简介：ThispaperintroducesACvariable-speeddrivingcontroltechnologyapplicationinthecontinuousannealingline,includingthedrivesystemconfiguration,thedrivingcontrolcharacteristicsofCALandthemaincontrolfunctionsofthedrivesystem.Firstlyintroducesthemainprocessofthecontinuousannealingline,thefeaturesofthe6SE70seriescommonDCbusdrivesystemandtheG150seriesdrivesystem.Secondly,forthecontinuousannealingline,therearemorestrictrequirementsforthecontinuityofproductionandmorespecialrequirementsforthedrivecontrolcharacteristics.Wedoalotofimprovementandstandardizationforthedrivingcontrolfunctionsandtheinterfacesofthelineautomationcontrolsystem.Thispaperdiscussesthecommunicationinterfacespecificationsandthedimensiontransformationmethodsbetweenthedriveandthebasicautomationsystem.Thedetaildimensiontransformationmethodsandcalculationmethodaboutthelinespeedsettingandtheactualrollerdimensionsettingaregiven,anddetaildescriptionforthecalculationmethodofthereferencespeedinthedrive.Articlealsoemphasizedillustratesrealizingandtestingmethodsofinertiacompensationofequipmentinthedrives,andstandardizethevalueoflineaccelerateanddeceleraterate,andtheinertiatestmethodandinertiacompensationcoefficientcalculationmethodisintroducedinthispaper.Forthebridgerollersandfurnacehelprollersloadbalancecontrol,thispaperpresentstwodifferentloadbalancecontrolstrategies,theloadbalancecontrolprincipleforbridgerollerswhichdatacommunicatesfrommainstationtoslavestationsbySimolink,andtheloadbalancecontrolprincipleforfurnacehelprollerswhichusedroopcontrol.Thedifferentcharacteristicsofthosetwomethodsarestatedindetail.

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简介：Sincetheexcessivecapacityinsteelmakingandcontinuouscastingatpresent,andthelimiteddevelopmentmarginofCCtechnologyandequipmentinscale,thefurtherdevelopmentmustbemadeinaprofoundanddetailizedway.ThispaperenumeratestheitemsofCCtechnologyandequipment,whichneedtobedetailizedfromseveralaspectssuchasrollarrangementdesign,equipmentdesignandproductionoperation,anditpointsoutthatdetailizationisthefuturedirectionofCCtechnologyandequipment.Theitemsinrollarrangementdesignincludeeliminatingperiodicmeniscusfluctuationbyadjustingspacebetweenrollsreasonably;takingspecialmeasurestoavoiddangerousregionsofcastingspeed,inordertoreducethecenterporosityandcenterlinecrackofslab;optimizingthemajorradiusandthelengthofouterarcofcasterbeforestraighteningpointtoavoiddangerousregionofcastingspeed.Theitemsinequipmentdesignincludechoosingasuitablestructureofsupportandguidingrollaccordingtotheconcreteconditionsofcaster;accordingtobulgingshapeofslab,thinkingmoreaboutrestrictionofshelltobulgingforce,discussingtheforceonrollers,optimizingsplitrolltosupportslab;safetyfactorshouldbeconsideredtogetherwithcalculationmethodofthebearingnominalstaticload.Theitemsinaspectsofcontinuouscastingoperationincludethedelicacydivisionandthefunction-positioningofoperationmodesforCCmachineduetotheconsiderationofdynamicsoftreduction;monitoringandcontrollingsystemofCCmachinemustbefurtherdetailizedtoimprovethestabilityofproductionoperationandslabquality.Inadditiontothethreeaspectsmentionedabove,thisarticlepointsoutmanyotheritemsalso,suchashomogenizationofsecondarycoolingofslab,qualitycontrolofsurfaceandinternalofslab,andsoon.Thisarticleemphasizes,somekeytechnologiesneedtoberesearchedalso,andalltheseresearcheswillneverstop.

简介：AfterexpandingthecapacitybywideningthetrolleyoftheNo.3sinteringmachine,severeunevensinteringoccurredinthetrolley’slateraldistribution,whichaffectedtheoutputandqualityofsinter.Inthisstudy,thequantitativeevaluationindicesoftheburdenuniformdistributioninthewidthdirectionofthesinteringmachineisintroducedforthefirsttime.Bymeasuringthetemperatureofdischargedgas,aplanetemperaturefieldisconstructed.Throughanalyzingthetemperaturefieldandtheburdenlayer’sdifferentialthermalequilibrium,amathematicalmodelforevaluatingtheindices,whichisanonlinereflectionofthedegreeofuniformdistribution,isbuilt.Followingtheimprovementsinburdendistributionequipment,theoptimizationoftheignitionsystemandthedynamicadjustmentoftheprocess,theproblemofunevensinteringinlateraldistributionhasbeensolved,andthequalityandtheyieldofsinterhavebeenimproved.

简介：ShorttapholelengthisoneofthemosttroublesomeproblemsofBaosteel’sCorex-3000afteritsstartup.Owingtothemeltergasifierprocess,thecharbedfloatedupanddownasthelevelofhotmetalandslaginhearthchanging.Thesecausealotofproblemssuchastheheavyerosionoftapholeareasandhardcasthousework.ThehighsecondtappingflowisanoticeablecharacteristicofCorexprocess.Thereasonsofshorttapholeisanalysed,andcountermeasuresareputintopractice,someimprovementsarecarriedoutinmodule2Corex-3000.

简介：DuetofastdevelopmentofChinesesteelindustry,continuousadjustmentofproduct,improvementofquality,researchofvalue-addedproduct,RHtechnologyissignificantlydeveloped.MoreandmoresteelplantsarecoveredwithRHfacilities.RHratioisgrowingrapidlyaswell.Overpastdecade,throughassimilatingadvancedforeigntechnologiesandfurtherrefiningthem,ChineselargescalesteelplantsmasterthetechnologyofRHproduction,operation,maintenanceandmakeitmorewidespread.RHfunctionsarewellappliedandimproved.RHismorewidelyeffectivelyputintouse.Throughindependentinnovation,RHcoredevicesandtechnology,suchasRHvacuumpump,oxygentoplance,vacuumvesselpreheatinglance,ladleliftingdeviceetc.haverealizedlocalization.Thedevelopmentofequipmentdesign,softwaredesign,equipmentmanufacturingtechnology,equipmentmounting,testtechnologyandEPCmanagementmakesequipmentconfigurationmoreflexible,equipmentmorefunctionalandstable,easiertooperateandmaintain.Italsoguaranteeshighlyeffectiveandlowenergyconsumptionproductionandqualityofsteel,reachesinternationaladvancedlevel,lowersthecostofRHconstructionandoperation,makesafter-sakeservicemoreconvenient.HowtocontinuouslyoptimizeanddevelopRHprocess,equipmentandcontroltechnology,inordertomeettheneedsofproductwithmorereasonableandeconomicprocess,exploitpotentialities,buildmoreeffective,lowercost,lowerenergyconsumption,protectingenvironmentRHfacilitieswillbethekeypointoffutureRHtechnologydevelopmentinChina.

简介：IntheMetalsIndustry,interruption-freeprocessestoproducehigh-qualityendproductsareaprerequisite.Themaindrivestogetherwiththemillstandsplayakeyroleinthesuccessofrollingmills.Thecrucialdemandsplacedonthedrivesystemare:high-dynamicperformanceofdriveanditscontrolsystem,abilitytohandletheprocessrelatedoverloads,smoothrunning,highavailability,highefficiency,easyserviceabilityandabilitytointegrateseamlesslywiththeautomationsystems.WithnumerousreferenceinstallationsandmanyyearsofexperienceSiemensVAIhasthewiderexpertiseandtheportfoliotoprovidetherightdriveforeveryapplication.Thispaperexaminesthelatestinnovation,SINAMICSdrivetechnology,forbothnewdriveapplicationsaswellasformodernizingtheexistingdrivesinrollingmillapplicationslikehotstripsmills,platemills,coldrollingmills,andlongrollingmills.

简介：Themainfailuremodesoftubingandcasingincurrentserviceconditionsarerepresentedinthisstudy.Theprogressofthetubingandcasingapplicationtechnologyandtheproblemsthatshouldbefocusedonduringapplicationareintroduced,withspecialattentionpaidtothereliabilityofthepipestringdesignandtheconnectionsealingproperties.Thenecessaryworkthatshouldbeundertakeninfutureresearchisalsosummarized.

简介：ByanalyzingrecentdevelopmentofreheatingfurnaceinShougang,thedirectionofrollingreheatingfurnaceislargetype,highefficiency,lowerpollutionandautomationetc.Manyadvancedtechnologiesareintegratedinnewrollingreheatingfurnacesuchasworkingbeam,regenerativecombustion,evaporationcoolingandhotloadingandhotfeedingetc.Itshowsthatreheatingfurnacetechnologyisupgraded.DuringtheprocessofproductstructureadjustmentinShougang,becauseproductheatingqualityisimproved,energy-savingofreheatingfurnaceshouldpayattentiontoaspectssuchasenergy-savingofheatingvarietysteel,equalityofheatingsteel,heatingsystem,oxidationlossandsoon.Thiswillofferreferenceforenergy-savingofdomesticandoverseasreheatingfurnacetechnology.

简介：TheSteckelmill,alongestablishedsolutionfortheeconomicalproductionofrelativelysmallvolumesofhotrolledstrip,hasbeenrejuvenatedinrecentyearsbyarangeofnewapplications,boostedbytheneedofimprovingtheenergeticefficiencyoftherollingprocess.ThetraditionaladvantagesoftheSteckelmillintermsofflexibilityandreducedcapitalandoperationalcostsarenowenhancedbytechnologicaldevelopmentsthathavesignificantlyexpandeditsapplicationrangeintothecombinedproductionofstripandplateandimprovedtheproductquality.Theincreasedawarenessofthenecessityofasustainablegrowthinthesteelindustryhasstimulatedthedevelopmentofprocesssolutionswithanimprovedefficiencyintheuseofnaturalresources,lowercarbonemissionsandincreasedyield.ModernSteckelmillsareanadequateresponsetothetrendtowardslowenergystripandplateproduction,inparticularintheirplate-Steckelmillvariant.SiemensVAIhaveplayedakeyroleintheinnovationandtransformationoftheSteckelmillconcept,withanumberofrecentinstallations,presentedinthispaperfromthepointofviewoftheircontributiontothedevelopmentofgreenersteelrollingtechnologies.

简介：Sincethe2050mmhotstripmillwasputintooperationin1989,Baosteelhasmadegreatachievementsinincreasingproductivity,developingnewprocesstechnologiesandsteelproductsandimprovingproductquality.Inthepast18yearsfrom1989to2007,Baosteelhasconstructedfivehotstripmillswithatotalannualcapacityof19.8Mt.Indicesfortechnologystandards,productcategoriesandsteelgrades,productquality,bothtechnicallyandeconomically,taketheleaddomesticallyorreachedtheworldclasslevel.Astherearemanyhotstripmillsthatexpectedtobeputintooperationbytheendof2010,theoverallannualcapacitywillexceed30Mt,andtheproductwillcovergrainoriented(GO)Sisteelsandalloyedsteels.

简介：ThisstudydescribesanoverviewofthePOSCO'sBaosteel'sshort-flow(BSSF)slagprocessingproject,includingprocessflow,processset-up,equipmentcomposition,auxiliaryfacilitiesandrelevantparameters,aswellasabriefdescriptionofitsapplicationaftercommissioning.

简介：TheresearchbackgroundandtechnicalfeaturesofBaosteelsinteringfluegasdesulphurization(FGD)—swirl-jet-absorbingwetlimestone-gypsumsinteringFGDtechnology,processandequipmentareintroducedinthispaper.MaincontentsandachievementsofthepilotexperimentandtheengineeringpracticeofBaosteelFGDareanalyzedanddiscussedsystematically.PastengineeringpracticeexperiencesindicatethatBaosteelFGDhasthefollowingmerits:wideapplicabilitytosinteringfluegasfeatures,suchasfrequentlychangingtemperatures,unstableSO2concentration,intensivelyfluctuatingflowrates,etc.,highpollutantsremovalefficiency,lowinvestmentandenergyconsumption;stableandreliableoperation,utilizablebyproduct(gypsum),etc.ItindicatesthatBaosteelsinteringFGDisofextensiveapplicationvaluefortheFGDoflargeandmedium-scaledsinteringmachines.

简介：Furnaceareaisregardedaslooperbetweencastingandhotrolling,whichisveryimportantformaterialflowbalanceandproductionorganizationaswellastemperatureregulationetc.Inparticular,whendealingwithenergysavingandemissionreductionandheatingqualityimproving,pre_heatingfurnaceispaidmoreattention.Theradicaltargetforpreheatingfurnaceistotransferheatingenergyattheleastcost.Asweknow,thepreheatingfurnaceisadissipationsystemtoobeyconservationofenergylaw,thatistosaythatinputenergyalwaysequalstooutputenergy,inthemeantime,thewholeenergyconsumingisnotreversible.Thereforeincreasingtheefficiencyofusingenergyisuppermost.Inthispaper,heatingtransferefficiencyisanalysedandmathematicalexpressionisgivenbasedonconservationofenergylaw.Typicaloptimalmethodstoimprovepreheatingfurnacetransferefficiencycomingfromforeignfactoriesarepresented.Accordingtothesemethods,everyfurnacezonetemperaturesascontrolvariable,targetdischargingtemperatureandtemperaturedifferenceinslabthicknessandthetemperaturebetweenneighbouringzonesaswellaszonetemporarytemperatureasrestrictions,minimalenergyconsumingasoptimizingtarget.Baosteelpreheatingfurnacemodelstructureandthecomplicatedmappingrelationofcontrolparametersetandstatesetandaimsetarepresented.Importantbasicmodelsinthepreheatingfurnacemodelsystemareanalysedincludingtemperaturetrackingmodelandtemperatureforecastingmodelanddischargingpacingmodelandslabheatingcurve.Firstslabtemperaturemodelstructureanditsperiphericparameterareintroduced;secondtwopacingmodelsaregivenincludingtimingpacingmodeusingfixeddischargingintervalandmillpacingcontrolmodeusingmillrollingpacingwhileBaosteelpacingforecastingmodelusinglongtermandshorttermforecastingmode)isgiven;thirdaheatingcurvemathematicalmodelconsideringheatingqualityandrollingpaceandenergyconsumingispresented;