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

简介：ShougangGrouphascarriedoutastrategicstructureadjustmentinordertorealizethepromiseofChinesepeopletotheOlympicGames.Automotivesheetsarechosenasatypeofstrategicproductandanenginetoupgradeenterprisemanagement,technologyandoperationtoreachthetopinternationallevelduringthetransitionfromlongproductstosteelsheetsinShougangGroup.Since2006,ShougangGrouphasmadeanelaboratepreparationonsteelsheetculture,productionlineconstruction,technologyimport,pilotplantandtalentreserve.Itlaysthefoundationforthedevelopmentofautomotivesheets.Thedevelopinghistoryofcoldrolledautomotivesheetsisreviewedandtheresearchanddevelopmentofcoldrolledautomotivesheets,tacklingkeyproblemofdefectonsurfaceandthelatestprogressofautomotivesheetsconstructionaredescribedinthispaper.Themaincontentsweregivenasfollows:①TheproductsofautomotivesheetsrealizezerobreakthroughinShougangGroup.Monthlyoutputwas300toninJanuary,2009anditincreasedto48000toninJune,2010.TheratioofIFsteelsheetsincreasesto70%from40%.Theproportionofoutsidepanelinautomotivesheetsoccupysmorethan15%.②Ahighemulationalpilotplantisusedasaproductdevelopingplatformtodevelopsuccessfullyautomotivesheetswith1000MPaandbelow.ItguaranteesthattheindustrialdevelopmentofDPandTRIPsheetsgetssuccessatatime.Itcoverscontinuousannealingsheetswithtensilestrength≤780MPaandgalvanizingsheetswithtensilestrength≤590MPa.③Individualdesignisusedtomeetspecialrequirementofcustomer.Shougangowns23innerbrandsofLCAKandIFsteels.Itinsuresthatthegradesofyieldstrengthcoverwholerangefrom120to270MPa.Itkeepsthestabilizationofsteelperformancebymeansofchemicalcompositioncontrolandhighaccuracyrollingtechnology.Forexample,thestrengthofsoftsteelfluctuateswithin±15MPa.④ThesteelsheetswithsurfacegradeO5areproducedsteadilybysolvingformingstr

简介：Low-carbonbecomesahigh-frequencyandfashionablewordwhichgetsthegreatestconcernintheworld.Low-carbonreferstoaminimaloutputofgreenhousegasemissionsintothebiosphere,specificallyreferstothegreenhousegascarbondioxide.Toreduceenergyconsumptionofautomobile,moreandmorehighstrengthsteelsareusedbyvehiclecompanies.Tomeettherequestofvehiclecompanies,varioushighstrengthsteelsaredevelopedinsteelcompaniesallovertheworld.Ansteelcanprovide,ultra-lowcarbonbakehardening(BH)steels,dualphase(DP)steelsandtransformation-inducedplasticity(TRIP)steelswiththegradesofunder780MPa,uptonow.AHSSsteelshavemuchdifferentcomposition,microstructureandstrenghtthanconventionalvehiclesteels,sotherearesometroubleinproducingincoldrollingmills,forexample,difficulttojoin,poorthicknessandflatness,accuratetemperatureandvelocitycontrolandsoon.Toreducetheopportunityofstripbreakage,wehavedonemanyweldingexperimentsandspecialresearch.Now,DPandTRIPsteelscanbecontinuouslyproducedinAnsteel.Toassurethicknessandflatnessofstrips,weoptimizedthehotrollingparametertogetlowdeformationresistance,optimizedrollingoiltogetfitfrictionalcoefficientandfixonthetargatrollingcurve.Togetmoreaccurateandrepetitiveresultsovertheproductionshifts,theMathematicalModel(MM)isusedinAnsteel.TheMManalysesinformationtransmittedbyvarioussensorsandtransmitters,comparesthecollecteddatawiththechosenparametersandadjuststhesettingsofthevariouspiecesofequipmenttohoneontheparametersetpoints.Atpresent,thekeyproductiontechnologiesofAHSSweregraspedbycoldrollingmillAnsteel,andAnsteelisthefirstcompanytoapplytheTRIPwiththegradeof780MPa.

简介：Thisstudyresearchescoldrolledultrahighstrengthmartensiticsteelprocessedbywaterquenching.Itisfoundthatboththequenchingandoverageingtemperaturesgreatlyinfluencethemechanicalpropertiesofmartensiticsteel.Atensilestrengthof1500MPacanbeobtainedfrom0.2%C-1.8%Mnsteelbysoakingat840℃,quenchingat700℃andoverageingat200℃forseveralminutes.Thecontinuouscoolingtransformation(CCT)diagramrevealsthatfullmartensitecanbeobtainedatacoolingrateof100℃/sorhigher;andatacoolingrateof3-10℃/s,austenitebarelydecomposesat700℃.Forsteelwith0.2%carbonandlessmanganese,austenitedecompositionoccursbeforeitiscooledto700℃atacoolingrateof3-10℃/s,whichleadstolowertensilestrength.Itispossibletoreducethemanganesecontentofthe1500MPamartensiticsteelbyincreasingthequenchingtemperature.Toincreasethequenchingtemperature,thecontrolofflatnessduringwaterquenchingbecomesamajorconcern.

简介：Anonlinepinholedetectorbasedonthephotoelectricinspectionofcold-rolledsteelstripswasintroduced.Pinholedetectionisimportanttoguaranteethequalityofcold-rolledsteelstrips.ThedetectorherewasdevelopedindependentlybyBaosteel,andisdesignedbasedontheprincipleofphotoelectrictransfer.Typically,aninspectionlightsourceisinstalledabovethesteelstriptobeinspected,andaphotoelectricreceiverisinstalledbeneaththesteelstrip.Thepinholedetectorconsistsofasuper-brightLEDlightsourceandaphotoelectricreceiver,whichiscomposedprimarilyofphotomultipliers.Thesuper-brightLEDlightsourceilluminatesthestripsurface,andthelightthatpermeatesfrompinholesisdetectedandamplifiedbyaphotoelectricreceiver.Thephotomultipliertransformsthedetectedlightintoanelectricalsignal,whichislaterrecognizedandclassifiedbyasignal-processingcircuitandcollectedbyadata-acquisitioncard.Thedetectorcanaccuratelytrackthestripedgeandshieldthestripedgefromoutsidelight.Asaresult,thissystemcandetectapinholeinthestripedgewithasmallblindzoneontheedge.Mostimportantly,thedetectorexhibitsgoodinspectionaccuracyandcanaccuratelydetectapinholewithadiameterof155m.

简介：Inthispaper,theflatnesscontroltechnologyAnShaperTMforcold-rollingmillandindustryapplicationareintroduced.AnShaperTMincludes;partitioningpiezomagneticshapemeterforflatnessmeasurementforcold-rollingstrip;flatnessmeasuredsignalsprocessingsystembasedondigitalsignalprocessing（DSP）;flatnessfeedbackcontrolmodelsystembasedonthecontrolefficiencyofflatnesscontrolactuatorsandmodeladaptivefunction.TheapplicationverifiesthatstripflatnesscanmeettheneedofhighqualityproductbyusingAnShaperTM.Theaverageflatnessqualityisabout5Ⅰ-unitandthe0.18mmultrathinthicknessstripflatnessis10Ⅰ-unit.

简介：Inthispaper,themechanicsofstripedgecracksanditspropagationhasbeenstudied,andtheeffectsofstripedgedropandstressintensityfactor(SIF)onedgecrackdefectionsduringcoldrollingofthinstriphavebeendiscussed.Anexperimentalinvestigationwaspresentedintotheeffectofstripedgedroponedgecracksduringcoldrollingofthinstrip.Theedgecrackincreasessignificantlyduetomoreinhomogeneousdeformationandworkhardeningatthestripedge.Theeffectivestressintensityfactorrangeisimportantasitrepresentsthemajorphysicalcauseofthecrackpropagation.TheefficiencyandreliabilityoftheSIFanalyticalmodelhasbeendemonstratedinthestudy.Theproposedmethodforpredictingstripedgecrackishelpfulinproducingdefect-freeproductsandprovidinganunderstandingofthemechanicsofedgecrackpropagationincoldrollingofthinstrip.

简介：SUS304stainlesssteelistypicalofausteniticstainlesssteel,whichorganizationismetastableaustenite,easilyappearsworkhardeningincoldrolling.Accordingtothecommonprocess,themaxreductionofcoldrollinginonestageisbelow80%,wetrytorasiethemaxreductionto90%inonestage(wecalledthat'greatreduction')fromtheviewofcutingcost.Duetotheworkhardening,greatreductionbringslotsofproblem(thedifficultyofflatnesscontrol,stripbreak..etc)。ThisarticleanalyzedthegreatreductionfromproperityofSUS304steel,milltypes,flatnesscontrol,rollingtechnicsetc,suppliedthecorrespondingsolutions,andformedasophisticatedgreatreductiontheory.Thisarticlefocusesontheunusualthermalcrownofrawmaterials(ie,abnormaldistributionofhorizontalthickness)andtherollingforcefluctuationsin'greatreduction'rolling.First,the'distortion'phenomenonwhichcausedbyunusualthermalcrownofrawmaterialsisexplained,wedge-shapedstripIncoiling,becauseofabigdifferenceinthicknessonbothsides,leadstodifferentcompressivestressonbothsidesofflatnessroll,sothattheflatnessmeasurementisdistorted;Second,the'stripshifting'phenomenoncausedbywedgeshapeofstripisexplained,weanalysisthestressonbothsidesofthestrip,concludedthatthewedge-shapedstriponthecoilerwillshifttothethicksideofthedeviation,theamountofstripshiftingisrelatedtothewedgelevel;BecauseofthecharacteristicsofSUS304,thestripisdifficulttoberolledinthelastfewpasses.sothestripbreakingiseasilyoccurred,wefoundthereasonableparameters(rollingspeed,coolingoil,tension,etc)tosolutethatproblem;Thedeviationofrollingforcewillcausetheshapeoftherollgap,thusaffectingtheshapecontrol,especiallyintheheadandtailpartofthestrip,Itisimportanttominimizethedeviationofrollingforce;The'greatreduction'processprovidethefavorableflatness(<8I-unit)andthicknessdeviationwhichlessthan±3um,withnosi

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

简介：Thecoolingandlubricationprocessisoneofthekeyprocessesincoldrolling,asitnotonlydeterminessurfacequalityandstripshape,butalsoreducestherollingpowerconsumptionandextendsthelifeoftherollevenduringhigh-speedoperation.Inthisstudy,aninnovativemethodcombiningemulsionlubricationandneatoillubricationwasusedtosolvesomeproblemsassociatedwithindividualpasses.Laboratorytestsonstainlesssteelstripsshowedthatthisnewlubricationmethodcouldimprovethesurfacequalityofthestrip,controltherollingfrictioninthedeformationzone,andhasthepotentialofmakinglubricationsystemssimplerandeasiertooperate,allwhilereducingthenegativeenvironmentalimpactfromemulsionprocessing.

简介：Inthisstudy,theeffectsofstandoffdistance(SoD)onthesupersonicflowfields(includinggasandparticleflowfields)duringcoldgasdynamicspraying(CGDS)areinvestigatedbymeansofcomputationalfluiddynamics(CFD).Thevariationofvelocity,temperature,pressureanddensitywithdifferentSoDiselucidatedthroughtheanalysisofthedistributionpropertiesoftheflowfields.Itisfoundthattheshockwavesinfrontofthesubstrateremarkablyinfluencethegasandparticleflowfields.Thewavesystemofexpansionwavesandpressurewavescomeintobeingcontinuously.ThevelocityofgasreachesthesupersonicspeedatthepositionoftheMachdisc,whileitdecreasessharplywhenthegasflowcrossestheMachdisc.TheoptimalSoDsare40mmfor1μmparticlesand50mmforboth5μmand22μmparticles.

简介：

简介：Theeffectofannealingtreatmentonthemicrostructuresandmechanicalpropertiesofcold-sprayedNicoatingwasinvestigatedbyconductingmicro-hardnessandtensiletestsandusinganormalopticalmicroscope(OM),ascanningelectronmicroscope(SEM),atransmissionelectronmicroscope(TEM)andanelectronprobeX-raymicroanalyzer(EPMA).Theresultsshowthatfollowingtheincreaseoftheannealingtemperature,themicro-hardnessofcold-sprayedNicoatingdecreasesandtheelongationafterfractureincreases,whilethetensilestrengthincreasesbeforedecreasing.Thetensiledeformationandfracturebehaviorchangefromatypicalbrittlefracturetoahybridbrittleandductilefracture,thentoatypicalductilefailure.Itisfoundthatwhenannealedatanelevatedtemperature(e.g.900℃),thegrainstendtogrowabnormallywiththeoxidesspheroidizingandthedefectsagglomeratingattheinterfaces,causingthetensilestrengthreductionofthecold-sprayednickelcoating.Itisalsopointedoutthatthetensilestrengthofthecold-sprayedNicoatingcanbesignificantlyimprovedbytheappropriateannealingprocedures,buttheelongationafterfracturecannotbeclearlyincreasedbecauseitisdifficulttoeliminatethemaindefectsinthecoatingbythefollowingheattreatments.

简介：Textureevolutionofhigh-manganesetwining-inducedplasticity(TWIP)steels(Fe-16Mn-0.6C)duringcold-rollingisstudiedbymeansofquantitativeorientationdistributionfunction(ODF)analysis.Thicknessreductionsofthespecimensduringcold-rollingare10%,20%,30%,50%and65%,respectively.EvolutionoftextureisoftheBrasstype,whichistypicalforlow-stackingfaultenergy(SFE)materials.Thecontributionofdeformationtwinningtothedevelopmentoftextureisclearlyillustratedbythemonotonici...

简介：Cold-rolledmartensiticsteelsheetsproducedoncontinuousannealinglineswithwaterquenchingfacility,haveadvantagesofhighstrengthandlowalloyingelementcontents.Theseareingoodaccordancewiththetrendoflight-weightingandfuelsavingforautomotivesteel.Inthisarticle,acold-rolledmartensiticsteelisstudiedtoinvestigatetheeffectofannealingparametersonitsmechanicalproperties.Itisfoundthatthequenchingtemperatureandtheslowcoolingspeedaswellastheoverageingtempe...

简介：Thetensilebehaviorandpropertiesofcoldformedlow-carbonmicroalloyedsteelwithitsmicrostructureofallferriteandpearlite(F+P)wereinvestigated.Bendingandflatteningdeformationswerecarriedoutinthelaboratoryonhot-rolledsheetsinordertosimulatethecoldformingprocessofsteelsheetsduringpipefabricationandsamplingofhighfrequencystraightbeadweldingpipes.Acomparisonofthetensilebehaviorandpropertiesofthematerialmadebeforeandaftercoldformingindicatesthatcolddeformationaltersthetensilebehaviorandpropertiesofthematerialtoacertaindegreedependingonthemannerofthecolddeformationandthedegree.TheresearchontheBauschingereffectindicatesthatforthesteelsinvestigated,whentheplasticstrainissmall,thebackstressincreasesrapidlywiththeincreaseoftheplasticstrainandthenrapidlytendstosaturation.ThefiniteelementanalysisindicatesthatthechangeinthepropertiesofthesteelsheetsduetocoldformingisaresultoftheBauschingereffectandworkhardening.Themechanismofthechangeinthepropertiesisalsogiveninthisstudy.

简介：316Lstainlesssteelcoatingswerepreparedbycoldgasdynamicspraying(CGDS)onacarbonsteel.Anewheaterofsprayedpowderswasaddedtothetraditionalfacility.Theresultsshowthatthecoatingqualityisobviouslyimproved,duetobetterinterfacebondingandreducedporosity.

简介：Withacomplicatedcomposition,largeproductionandseriousdamagetotheenvironment,stainlesssteelcold-rollingsludgehasbeenafocalpointconcerningenvironmentalprotectionforstainlesssteelenterprises.Uptonow,neitherathomenorabroadhaveanytechnologiescomeintobeingthatarenotonlyproper,safeandeconomicalbutalsosuitableforbulkutilizationofstainlesssteelcold-rollingsludge.Basedonthecharacteristicsofthestainlesssteelcold-rollingsludge,orthogonalexperimentswerecarriedoutonpelletproportioningandhigh-temperatureroasting,andmajormetallurgicalpropertiesofsludgepelletswerealsotested.Astheresultsshow,pelletswith30%additionofcold-rollingsludgearequalifiedregardingtheircompressivestrength,chemicalcompositionandmajormetallurgicalproperties.Noadverseimpacthappenstotheblastfurnaceoperationwhensludgepelletsaccountfor10%oftheblastfurnacerawmaterials.Therefore,thetechnicalrouteappliedinthispaperisprovedsimple,feasibleandenvironmentallyfriendlyforcold-rollingsludgetreatment.

简介：Coldrolledmartensiticsheetsteelsareachievingmoreandmoreapplicationsincar-makingbecauseoftheirultra-highstrengthandpotentialforweightreduction.Therelativelylowplasticityofultra-highstrengthmartensiticsteelsmightbeadrawbackfortheapplicationsintheaspectsofformingandsafetyprotectionfunctionandshouldbesignificantlynoted.A1500MPagradecoldrolledmartensiticsheetsteelhasbeenstudiedtoinvestigatethebendabilityat90degreebendingandimpacttoughnessaswellasfracturesurfacemorphologyatvarioustemperatures.Somediscussionshavebeenmadebasingupontheexperimentdatatogetsomeunderstandingontheperformanceofthematerialsundervariousconditionsandonhowtomakeuseofthiskindofultrahighstrengthsteelproperly.

简介：ThepapershowsthemainsurfacedefectsofcoldrollingautomobilesheetinBXSteel.Themainsurfacedefectsareunusualdefects.Thetypicalfamiliardefectsaresliverandpunctuatesthatareontherollingdirection.Theinclusionsofsteel-makingandscalesofhotrollingprocessarethemaincausesofdefects.Theyarethebiggestproblemspuzzlecoldrolledautomobilesheetsurfacequality,andaretheburningissuesofBXSteel.Weclassifyandanalysisthedefects.Weobservethepanoramaofsurfacedefectsusingportablevideomicroscopyapparatus,andcleanthesampleusingultrasonicshaker,analysisthedefectspatternandchemicalcompositionusingscanningelectronmicroscope.Atpresenttheprimarydefectsthatimpactedcoldrolledautomobilesheetqualityaredarksliverdefects.Wecontrolthesteel-makingandhotrollingprocessaimingatthecauseandpositionofdefectsmaking.Wefinecontroltheoperatingofsteelladle,gating,castingsystemandcontinuouscastingmachineinsteelmakingprocess.Thescaledefectisreducedbycontrollingfurnace,highpressurewaterdescalingsystemandfinishmilldescalinginhotrollingprocess.Alonewiththereformingandrenewingofequipment,gatheringproducingexperience,thecoldrolledautomobilesheetqualitymadeinBXSteelisupgradinggradually.