简介：Inordertoimproveargonblowingefficiencyina40tonladle,numericalsimulationandwatersimulationexperimentsofthebottomargonflowwereperformed.Relationshipsamongtheladlemixingtime,slageyearea,differentblowingflowrates,anddifferentblowingpositions(0,0.56R,0.62R,0.67R)arediscussed.Resultsshowedthattheladlemixingtimedecreasedwhentheargonblowingbrickdistance(frombottomcenteroftheladle)increased,anddecreasedsignificantlywhentheblowingflowincreasedfrom70to130L/h.Whentheblowingflowincreasedandexceeded130L/h,thestirringeffecttendedtobestable,andtherewaslittleeffectontheladlemixingtime.Theslageyeareaincreasedastheargonbrickdistanceincreased,andwaslargerwhentheargonblowbrickwasneartheladlewall.Wallshearstresssignificantlyincreasedasthebrickdistanceincreasedandwasconcentratedattheslagwallneartheargonflowbrick;thisiscalledthemostseriouserosionwall.Theaveragewallshearincreasedexponentiallywithincreasingargonblowingbrickdistance.

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简介：BasedontheanalysisresultsofthedustsizedistributionoffluegasfromBaosteel'sshort-flow(BSSF)slagprocessingsystemandthemechanismofthewetscrubber,awetscrubbersystemwasdesignedandinstalledintheNo.1BSSFslagprocessingsystematBaosteel.Theresultsshowthatthedustremovalefficiencyoftheprevioussystemthathadconventionalwaternozzleswasonly69%withaliquid-gasratioof0.79L/m3,whilethedustremovalefficiencyreached94%whenthreesetsofhigh-efficiencydualphasespraygunswereinstalledinsideboththeflueandthechimney.Forthelattersystem,theliquid-gasratiowas0.84L/m3,andthedustconcentrationinthecleanedemissionsreducedtolessthan40mg/m3.

简介：Thecharacteristicsofthedesulphurizedgypsumproducedinthefluegasdesulphurization(FGD)processoftheBaosteelsinteringplantareinvestigatedinthisstudy.Accordingtothetechnicalandqualityrequirementsofgypsuminthecementindustry,thefeasibilityofusingdesulphurizedgypsumasacementretarderisalsostudied.Theresultsshowthatdesulphurizedgypsumcanbeusedasacementretarderinsteadofnaturalgypsum.

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简介：Thispaperintroducesworkingprincipleandtechnicalfeaturesofvacuumfilterinemulsionsystemfortandemcoldstripmill.Basedonspecificcases,thispaperanalysesandassessestheeffectbeforeandafterusingtheemulsionsystemwiththeusageofthevacuumfilterforstripmill.Comparewiththeeffectwhenusingthefirstgenerationvacuumfilter,theemulsionqualityisimprovedsignificantlybyusingthesecondgenerationvacuumfilter,whichatthesametimeensuressteadyoperationoftherollingmillandsurfacequalityofthemillproducts.Asaresult,investmentandrunningcostsarelowered,emissionsofthewasteemulsionarereduced,wastewatertreatmentcostsarereducedandsoastheenvironmentalpollution.Itcanbeseenthesecondgenerationvacuumfilterhasobviouseconomicandenvironmentalbenefits.Therefor,itsuggeststhatthefiltershouldbeusedwidelyinthefieldofautomotive,environmentalprotectionrollingsteelandnonferrousmetals.

简介：TheapplicationtechnologyusingBaosteelsteelslagpowderasanadmixtureofconcreteisthedevelopmentaldirectionofsteelslagrecyclingtreatmentandutilization,whichfullyreflectsthebasicfeaturesandgoodcompatibilityoftheover-calcinedclinkerofsteelslagresources.Itisbeneficialtofullyexploitthewaterhardeningcharacteristicandpotentialactivityofsteelslag,toreduceandcontroltheunstablefactors,suchasfreecalciumoxideandmagnesiumoxide,andtorealizehighvalue-addedapplicationsandexplorenewapplicationfields.

简介：Sincethe21stcentury,greatattentionhasbeenpaidtoultrafastcooling（UFC）technologyinthewholeworld.Theindustriesandtheresearchinstitutionsbegantocarryoutinvestigationsonbasictheoriesandindustrialapplications.Since2003,theRALofNortheasternUniversityhasmadesomeprogressesonmicrostructurecontroltheories,understandingofstrengtheningmechanismsandtheirindustrialapplications.Inthispaper,theseachievementssincethelastBaosteelBACin2008willbereportedontheindustrializationofUFC,strengtheningmechanism,developmentofnewsteelgrades,andsoon.

简介：13kindsofironores(6fromAustraliaand7fromBrazil)werestudiedontheirpropertiesconcerningCW(CombinedWater)decomposition,Fe2O3decompositionandsoftening-meltinginairatmospherethroughthecharacterizationmethodofTG-DSC(Thermogravimetry-DifferentialScanningCaloremetry).TheexperimentalresultsoftheAustralianoresandBrazilianoresdifferintermsoftheinitialtemperature,temperaturerangeandendothermicamountofCWdecomposition,andbesides,thecontentofCW.ItisestimatedthatforeverypercentincreaseofCWcontentinsinteringrawmaterial,theextrathermalamountabsorbedintheprocessisabout1.83×104kJ,whichequalstothethermalcapacityof0.625kgofstandardcoalburningupcompletely.AstothedecompositionofFe2O3,theinitialtemperatures,terminaltemperaturesandtemperaturerangesoftheAustralianandBrazilianoresarequiteclose.However,theendothermicamountofFe2O3decompositionofthetwoturnsoutratherdifferent:theendothermiccapacityofFe2O3decompositionoftheAustralianoresisgreaterthanthatoftheBrazilianores.Furthermore,theliquidamountgeneratedinthesoftening-meltingprocessiscloselyrelatedtotheSiO2contentinironore.ThehigherSiO2contenttheorecontains,themoreliquidvolumeitwillgenerateinthesoftening-meltingprocessofironore.

简介：ThedimensionvariationofB610EsteelduringthequenchingandtemperingprocesswassimulatedbyABAQUS,thecoefficientofheattransferduringquenchingwasverifiedbytheburiedthermocoupletestandthetrendofthedimensionvariationduringthequenchingprocesswasalsocalculatedbyABAQUS.Itwasshownbythecomparisonofsimulatedresultsandindustriallymeasuredresultsthatonlythesimulationofthicknessandwidthvariationwasaccurate,whilelengthvariationneededfurthersimulation.Besides,thedimensionvariationtrendwasidenticalwiththemeasuredresults.

简介：Toimprovetheprecisionofthecoilingtemperatureandtheperformanceofthefeedbackcontrolsystemwithlongpuretimedelayonhotstripmills,weanalyzedthedesignprocessoftheDahlinalgorithmindetail.ThecoilingtemperaturecurvescontrolledbythePIDalgorithmandDahlinalgorithmweresimulatedandcompared,whichshowedthatthecontrolprecisionwiththeDahlinalgorithmwashigherthanthatwiththePIDalgorithm.Thatwasfurtherverifiedbytheproductionpractice.

简介：Twothermo-mechanicalcontrolledprocesses(TMCP)includingcontrolledrollingandacceleratedcoolingareproposedfortheproductionofheavygaugeSUS304Lausteniticstainlesssteelplateswithdifferentstrengthsandothercharacteristics.BasedontherecrystallizationmechanismandcarbideprecipitationbehaviorofSUS304Lausteniticstainlesssteel,TMCPprovidesapowerfulmeanstocontrolthemicrostructureandprecipitationofthehotrolledsteelplatebythecontrolledrollingandacceleratedcoolingprocess.Thedislocationdensityandgrainsizearethemainfactorsindeterminingthestrengthofthestainlesssteelplates.Therefore,itisnecessarytostrictlycontrolthehotrollingparameters,includingparameterssuchasthefinishhotrollingtemperatureintherecrystallizationtemperatureregionandthetotalreductioninthenon-recrystallizationregion.Furthermore,inordertoavoidcarbideprecipitationandguaranteetheintergranularcorrosionresistanceofTMCPSUS304Lausteniticstainlesssteel,acriticalcoolingrateafterrollingisdetermined.

简介：ThephysicalandchemicalpropertiesandsoundnessofBaosteelPowerPlant’sdrydesulphurizedflyashweresystematicallyinvestigatedandcomparedwiththoseofthesimilarbyproductsproducedbysomeotherdomesticpowerplants.Thefeasibilityofthesebyproductsusedasaconstructionmaterialwasalsoanalyzed.TheresultsshowthatBaosteel’sdrydesulphurizedflyashisakindofashwithhighcalciumandhighsulfurcontents,whichhasthecharacteristicsofvolcanicashactivity.Itcontainssulfateandsulfite,andiseasytocausesulfateactivation.Ithashigheractivitycomparedwithcommonflyash.Buthighercalciumsulfiteandfree-CaOcontentsinashwillbringaboutsoundnessconcernstousers.Therefore,qualitytestsandvolumecontrolwillbenecessarywhenflyashisusedasaconstructionmaterial.

简介：Withanalloycontentashighas80%ormore,Ni-basedOCTGisastrategicproductsrelatedtothestateenergysecurity,mainlyappliedintheexploitationanddevelopmentofsourgasfieldswithcomplicategeologicalformation,hightemperature,highpressureandseverecorrosivewellconditions.Ni-basedOCTGisregardedasthepipeproductwithmosthightechnologiesduetothecomplexityandgreatdifficultyinmanufacturingandrigorousrequirementsinqualitycontrol.Inthispaper,thetechnicalfeaturesandqualityrequirementsofNi-basedOCTGaresummarized,andthequalityandpropertiesoftheNi-basedOCTGproductsofBaosteelareintroducedindetail.WiththehelpofSEM,XPSandTEM,thecorrosionmechanismofNickle-basedOCTGintheenvironmentscontainingH2S,CO2,Cl-andelementarysuifurarealsoanalyzed.

简介：Toavoidintergranularcorrosionandobtainmicrostructuralhomogenization,theconventionalSUS304austeniticstainlesssteelneedstobesolutionannealedafterhotrolling.Thisstudyinvestigatesthethermal-mechanicalcontrolledprocess(TMCP)ofSUS304steel,especiallythecontrolledrollingandonlineacceleratedcoolingprocedures.Theobjectiveofthisresearchistoreduceorevenpreventcarbideprecipitationbasedonthedescriptionofthetime-temperature-precipitation(TTP)curve.Thedynamicandpost-dynamicrecrystallizationbehaviorsofthissteelensuredthehomogenizationofgrainsinthisprocessdueto,whichwasstudiedbythehotcompressiontests.ThemicrostructureandthepropertiesoftheTMCP-producedSUS304steelstripwerecomparedwiththeconventionalmethodofsolutionannealing.Basedontheaboveresults,thenewlydevelopedTMCP-producedSUS304hot-rolledausteniticstainlesssteelstriphasbeensuccessfullyproducedanditcanbedirectlyutilizedinthecoldrollingprocesswithoutsolutionannealing.

简介：InwallshotblastingisamethodofimprovingthesurfacehardnessandhightemperatureoxidationresistanceoftheS30432high-pressureboilertube.Thedifferencesonresidualstress,sub-grainsize,micro-hardnessandstructurebetweentheS30432inwallshot-blastingtubeproducedbyBaosteelwithsixtechnologicalprocessparametersandtheimportedsuper304Hwerestudiedsystematicallybycontrasttestresearch.IthasbeendemonstratedthattheS30432obtainsahigherresidualstress,adeeperdistributed...

简介：Bymeansofthenumericalsimulationmethod,themathematicalmodelofinclusionsmovementinthemoldisestablishedundertheconditionofausteniticandferriticstainlesssteelslabproduction.Accordingtothesimulationresults,themainzonesforinclusionparticlesaccumulationwerefoundandmanyfactorsthataffectedfloating-upprobabilityofinclusionparticleswereidentified.Thesefactorsincludetheinclusionparticlesize,thecastingspeedandtheslabwidth,etc.Itisbelievedthattheinclusionparticlesizeisthekeyoneamongthesefactors.

简介：Inthisstudy,metallographicanalysisandnanoindentationcharacterizationwereusedtoanalyzethepropertiesandmicrostructuresofas-castnitrogenalloyed27Cr-7Ni-4Mosuperduplexstainlesssteel(super-DSS).Theas-castmicrostructureofthesuper-DSSwascharacterizedbyitsferriteandisland-likeaustenitephases.Duringthesolutionannealingprocess,theaustenitevolumepercentageofthesteeldecreasedgraduallywithincreasedannealingtemperature.Asamainelement,thechromiumcontentintheferriticandausteniticphaseselevatedslightlyatfirstthendecreasedwithincreasedannealingtemperature.Thechromiumpartitioncoefficientinthesteelvariedbyaround1.0.Thecontentsofnickel,anothermainalloyelement,alsoincreasedintheferriticandausteniticphaseswithincreasedannealingtemperature,asdidthenickelpartitioncoefficientinthesteel,whichtendedtobecloseto1.0.Thenanoindentationcharacterizationresultsindicatethatthehardnessoftheaustenitephaseisslightlygreaterthanthatoftheferritephase.Theyweresimilartoeachotherwithinacertaintemperaturerangefrom1050℃to1100℃.Thistemperaturerangewasconsistentwiththetemperaturerangeinwhichthecontentratioofthetwophaseswascloseto1∶1.WefoundtheYoung'smodulusoftheferritephasetobegreaterthanthatoftheaustenitephase.Withincreasedannealingtemperature,theYoung'smodulusoftheferritephasedecreasedwhilethatoftheaustenitephaseremainedalmostunchanged.

简介：Manyadvancedtechnologieshavebeenappliedindevelopingtheautomaticmeasuringdevicefortestingtransversethicknessdifferenceofcold-rollingsteelsheet,suchasthetechnologiesofautomaticcontrol,sensormeasurement,markingidentification,photographiclocation,computerapplicationandinformationtransmission.Thismeasuringdevicecanmeasurethetransversethicknessdifferenceofthesteelplateaccuratelyandquickly,withahighdetectionlevelofautomation.Itisaneffectivedetectionequipmentfortransversethicknesscontrolofsteelplate.Horizontalwidthofsteelplatemeasuring0.8-1.4m,horizontalmeasurementpointpositioningaccuracy±0.02mm,thicknessrange0.2-2.0mm,measurementaccuracywithin±1μm.

简介：Loadingdistributionforheavyplatemillistofindoptimalcontrolsolutionsunderthegrantedperformanceindicatorsandconstraintsincludingmillcapacityandhypothesisofrollingmodels.Thesolutionsarequitedifferentfordifferentperformanceindicators.Inthearticle,theperformanceindicatorsandsequentialquadraticprogramming(SQPforshortbelow)methodsemployedin5000mmheavyplatemillofBaoSteelarepenetratinglyanalyzed.Generally,theSQPmethodisaneffectiveandfastwaytosolvethenonlinearprogrammingproblemswithsmallormediumscaleconstraints.Earlyin1976,HanputforwardtheSQPmethodforthefirsttimeandPowellmadeitperfectandaccomplishedthealgorithmin1977.Infact,SQPmethodwastoturnanonlinearprogrammingproblemtoaseriesofsubsetofquadraticprogrammingproblems.Inthealgorithm,eachiterationstepistosolveonequadraticprogrammingproblem.Theoptimalsolutionswillbegraduallyapproachedafterquadraticprogrammingproblemsweretotallysolved.Whensolvingthequadraticprogrammingproblem,theactivesetstrategywereemployedwhichturnedtheconstrainedquadraticprogrammingproblemtounconstrainedquadraticprogrammingproblem.Theactivesetstrategymadethewholequadraticprogrammingproblembesolvedbyaleastsquareproblem.Andfinally,thematrixoftheleastsquareproblemwouldbedecomposedbyQmatrixandRmatrix.AfterQmatrixandRmatrixwereobtained,theoptimalsolutionswouldbefinallyfound.Forloadingdistribution,theperformanceindicatorswerecomposedbyplateshapeanddraftofeachpass.Plateshapeisrepresentedbyrollingforcegraduallyreducedpassbypasswithatunablefactor.Themillcapacityisanotherperformanceindicatorrepresentedbydraftofeachpass.Forheavyplatemill,themillcapacityhereisthemotormoment.Forheavydraft,themotorwouldbeoverloadedespeciallyforthefirstseveralpasses;forsmalldraft,themotorwouldbeloadedslightly.Allthesewouldnotbepermittedtohappenwhen