简介：Non-metallicinclusionisthemainreasonforthepresenceofsurfacedefectsincold-rolledsteelstrip.Inthisstudy,thecomposition,morphology,andsizeofthenon-metallicinclusioninhot-rolled304stainlesssteelstripsareanalyzed.Cold-rolled304stainlesssteelstripswithdifferentcold-rollingreductionhavebeenprepared,andthemorphologyandsizeofinclusioninthesecold-rolledstripsarealsoanalyzed.Furthermore,thedeformationbehaviorofanon-metallicinclusionduringthecold-rollingprocessisstudied.TheresultsshowthatCaO-SiO2-MgO-Al2O3,akindofbrittlecompoundoxide,isthemaintypeofinclusioninhot-rolled304stainlesssteelstrips.Duringthecold-rollingprocess,ductiledeformationofthistypeofinclusionisnotobvious,wherelargeinclusionsarecrushed,andtheaveragesizeofinclusionsincold-rolledstripsdecreasedwhilethecold-rollingreductionincreased.

简介：selectingseveraltypicalDSS00Cr22Ni5Mo3N,00Cr21Ni2Mn5Nand00Cr25Ni7Mo4Nasresearchmaterials,hotductilitycharacteristicofDSSwasstudiedandmicrostructureevolutionduringhotcompressionwasobserved.TheresultsshowthattheoptimumhotductilitytemperaturerangeofDSSis1050~1200℃.00Cr25Ni7Mc4Nexhibitstheworsthotductilityand00Cr21Ni2Mn5Nhassimilarhotductilityto00Cr22Ni5Mo3N.Duringhotcompression,austeniteofDSSmainlyoccursdynamicrecovery,theferriteof00Cr22Ni5Mo3N,00Cr21Ni2Mn5Ncanperformdynamicrecoveryandrecrystallization,butonlydynamicrecoverycanbeobservedintheferriteof00Cr25Ni7Mo4N.

简介：Thisstudycomparestheregenerativeradiant-tubeheaterwiththetraditionalradiant-tubeheater,showingtheregenerativeradiant-tubeheatershavemanyadvantagesinfuelconsumption.Basedontheexperienceofchangingaheatingsystemwithtraditionalradiant-tubeburnerstoaheatingsystemwithregenerativecombustion,propositionsaregivenforthecombustioncontrolsystem,pilotburner,flamedetectionandfortroublepreventioninrebuildingthecontinuousannealingproductionline(CAPL)andthecontinuousgalvanizingline(CGL).

简介：Thepatentingprocessofthreehot-rolledsteelswithcarbonmasscontentsof0.70%-0.90%wasstudied.Theeffectofthequenchingtemperatureonthecementitelamellardistanceinthesteelwasevaluatedonthebasisofmicrostructuralcharacterizationandmechanicalpropertytests.Thepatentingtreatmentofhigh-carbonhot-rolledstripanditsapplicationinspringswerediscussed.

简介：Fossil-fuelburninggreenhousegasinducedglobalwarminghasbeenrecognizedasglobalenvironmentalproblems,reduceandultimatelycontroltheenergyproductionintheuseofCO2emissions,globalenergyproductionwillbeamajorchallenge.Asahighlyintensivematerialsandenergy,ironandsteelenterprises,needtobeinvestedtoproduceonetonofsteelabouttwotonsofmaterialand0.7tofstandardcoalenergy,andwhileproducingtwotonsofCO2.Therefore,reducingCO2emissionsfromironandsteelindustryhasbecomethefocusoftheglobalsteelindustry.Thispaperdescribesanintegrateddomesticandinternationalmeasurestocontrolcarbondioxideemissionsresearchprogressandfuturetechnologytrends,withemphasisonthedomesticsteelindustryemissionsofcarbondioxidestatusoftechnologydevelopmentandindustrializationofimplementationoftheproposedonthisbasis,includingdryquenchingtechnology,gas,powergeneration,coalmoisturecontroltechnology,blastfurnaceinjectionplasticstechnology,theuseofcokingprocessfortreatingmunicipalwasteplasticstechnology,sinteringheatgeneration,lowpressuresaturatedsteamforpowergeneration,metallurgicalslagheatrecoverytechnology,cokeovengashydrogentechnologyandtheotherkeytechnologiesenergysavingtechnologies,includingthedevelopment,promotionandpopularizationofthesteelindustryinChinawillbetheCO2emissionreductiontechnologydirectionandfocus.Atthisstage,theChinesesteelindustrycanbeimprovedtheenergyefficiencyandrecyclingofwasteheatandenergy,reduceunitGDP,CO2emissions;butinthelongrun,shouldincreaseCO2captureandstorageontheinputoftechnologycanpossibleeffectivecontroloftheadverseeffectsofCO2emissions.

简介：Thispaperintroducestheprocessflow,technicalparametersandrelevantfeaturesofBaosteel'sNo.8airseparationunit(ASU)withacapacityof60000m3/h.Itsummarizesthecommissioningwork,whichincludestheadjustmentoftheaircompressor,thesystem'snakedcooling,theprecoolingsystemandtheoperationadjustment.Italsoprovidesdetailedanalysesonsomefailureswhichoccurredinthecommissioning.Throughthemodificationofthedesignandtheinterlocks,thetrippingprobabilityoftheaircompressorwasgreatlyreduced.Throughtheheatingofthesystemandthecontrolofthewatercooler'snitrogenflow,theoverproofcontentofcarbondioxideandfluctuationofoxygenflowwereavoided.Nitrogen-blockintheargonsystemwaseliminatedbytheprecisecontroloftheargonrectificationflowandargoncontent.Allthesesolutionshavebeenprovedtobeeffectivebypractice.

简介：The18Ni300gradecobalt-freemaragingsteelT300wassuccessfullymanufacturedonanindustrialscalebyapplicationofvacuuminductionmelting(VIM)andvacuumarcremelting(VAR)processatBaosteel.WiththecontentofOandNlessthan15ppmand10ppmrespectively(1ppm=10-6),theT300steelproducedbyBaosteelobtainedahighdegreeofpurityandagoodcombinationofultra-highstrengthandfracturetoughness.Theeffectsofsolutiontemperatureandageingtemperatureontensilepropertyofsolution-treatedandagedT300steelwereinvestigated.Theresultsshowthatthesolutiontemperatureslightlyinfluencesthestrengthofthesolution-treatedsteel,indicatingthatthesolutionstrengtheningratherthanthegrainboundarystrengtheningismoreimportanttothesolution-treatedsteel.Forthesolution-treatedT300,theelongationandreductionofareadon'tchangemuchwitharisingsolutiontemperature,andremainabove17%and70%respectivelyatthesolutiontemperaturerangingfrom800℃to1200℃.FortheagedT300steel,thestrengthandelongationarereducedwithanincreasingsolutiontemperature,andthesolutiontemperaturehasagreatereffectonthereductionofareathanthatontheelongation.Thereductionofareaoftheagedsteelreachesahighpeakwhenthesolutiontemperaturereaches920℃.Theexperimentaldataindicatesthatprecipitationstrengtheningmakesacontributionof1100MPatothetensilestrengthoftheagedsteel.Theageingtemperatureexertsagreatereffectonthestrengththanontheelongationandreductionofarea.Thesteelachievesabettercombinationofstrengthandtoughnessatthepeakageingtemperatureof500℃.

简介：Basedonthemanufactureofefficientnon-orientedsiliconsteelgrade,theeffectsoftinandsulphuronmagnetismanditsinteractionwasdiscussed.Theresultsshowedthatforpresentwork,minortincouldimprovemagneticinductionsharplyandhadlittleeffectoncorelosswhenthesulphurcontentbelow10×10-4%.TheprecipitationofAlNcouldbeprohibittedbytin,remarkably.Asthenucleus,tincouldremovalanyinclusionswhichsizewas0.5μmorabove,andhadlittleeffectoninclusionswhichsizewasbelow0.5μmasakeyfactorforcoreloss.Forfinalsample,themagneticinductionwasimprovedthroughthechangeofsteeltexturebytin.Therelationshipbetweenmagneticinductionandtin,sulphurcontentcouldberegressed:B=1.69-4.37S+0.30Sn.Fromtheregressionformulation,magneticinductioncouldbeimprovedfor0.03Twhen0.01%tinwasaddedundertheconditionofrelativelylowsulphurcontent.

简介：Thisstudyprovidesanoverviewoftheproductionandclassificationofmetallurgicalslaganditsimpactonenergy-savingandemissionreductioninthemetallurgicalindustryandananalysisoftheimpactofkeyfactorsonslagprocessingtechnology,includingabriefaccountofblastfurnace(BF)slagprocessingandapplicationswithafocusonthesteelslagdisposalprocessesandthefeaturesofsometypicalprocesses.Inviewofthecharacteristicsofthebasicoxygenfurnace(BOF)slagandthetechnicaldifficultiesfacedbythetraditionalprocesses,itdescribestheprinciple,featuresandtechnicaladvantagesoftheBaosteelshort-flow(BSSF)steelslagtreatmentprocessdevelopedbyBaosteel.Thethinkingandoutlookonthedirectionofthedevelopmentofthemetallurgicalslagprocessingprocessarestated.

简介：EffectsofMo,Nb,Tionmechanicalpropertiesandcorrosionresistanceof22.5%Crferriticstainlesssteelwereinvestigated.TheresultsshowthatMoexistsinferriticstainlesssteelmainlyinthesolutiontreatmentcondition,anditcanenhancesteel’sstrengththroughsolidsolutionstrengthening.InTi+Nbdual-stabilizedferriticstainlesssteel,thesteel’stoughnessdecreasesobviouslybecausecoarseTiNparticlesformandsomemetalliccompoundsprecipitatealongthegrainboundaries.InNbsingle-stablizedferriticstainlesssteel,NbexistseitherinthesolutiontreatmentconditionorintheformofdispersedprecipitatesNb(C,N),whichwillactasthenucleiofprecipitationofthefineσphase.Asaresult,theprecipitationofthecoarseσphasealongthegrainboundarycanbeinhibited,leadingtosignificantimprovementinsteel’stoughnessatalowtemperature.Basedonthese,highcorrosion-resistantferriticstainlesssteelB445Rwasdevelopedforthebuildingcladdingsystem.TestresultsshowthatB445Rhasasuperiorcorrosionresistancetoaustenitic316Linchloridesolution.Besides,ithasagoodformingpropertyandweldability.Allthesemakeitanidealdecoratingmaterialforthebuildingcladdingsysteminseverecoastalregions.

简介：Theentirerollerinlayedblockintelligencecoldstripshapemeterisdevelopedsuccessfullyinthispaper,whichcanstablyworkchronicallyinthecoldrollingworkshop,theindependentinnovationofthekeytechnologyofcoldstripshapemeasuring,theforeigntechnicalmonopolyandblockadearebrokenthrough.Thestructuralformwhichisdifferentfromtheinternationalpopularsegmenteddetectionrollerisputforward,theentiredetectionrollerinlayedblockisdeveloped,agroupofelasticblocksinthatthesenseorgansareinstalledareinlayedintheradialsymmetryrectangulargroovesofthedetectionrollerbody,theentirerollerstructureiscomposedofelasticpiecesandtherollerbody,thescratchofthestripsurfaceduetodifferentthermalexpansionofthetraditionaldetectionrollermeasuringunitisavoidedeffectively.Thesignaltransmissionformwhichisdifferentformtheinternationalpopulardryslipringisputforward,thespraywetslipringisdeveloped,slipringanddetectionrollercanbetakendownandinstalledaspossiblyasfast,sothemaintainisconvenient,whilethroughthesectionauto-spraycleaning,lubricationandcooling,theservicelifeisremarkableimprovedandtheoutsideinterferencesignalisreduced.Thesignalprocessingformwhichisdifferentformtheinternationalpopulargatheringcardisputforward,theembeddedDSPshapesignalprocessinghardwaresystemisdeveloped,theelectromagnet,temperature,humidityandvibration’sinterferenceofindustrypracticetoshapetransmissionsignalcanbeeffectivelyavoided,whichcanguaranteetheinstantaneityandmeasuredprecisionofshapemeasuredsignal.Theshapesignalprocessingsoftwaresystemwhosefunctioncontainserrorcompensation,patternrecognition,establishmentofthetargetshapeandtheclosed-loopcontrolcalculationisbuilt,theshapemeter’computerhumaninteractionisfriendly,andfunctionofshapemeterisstrong,atthesametimetheintellectualizedleveloftheshapemeterisimproved.Now,thi

简介：Thisstudyanalyzesthefeasibilityofusingstainlesssteelelectricarcfurnace(EAF)slagascompositecementadmixtureandtheriskofleaching-outofheavymetals.TheresultsshowthatthestainlesssteelEAFslag,mainlymadeupofCa2SiO4,Ca3Mg(SiO4)2,someCr-containingmineralsandinsmallparticlesize,iseasilygroundandhascementitiousactivity.EAFslag,whenusedascementadmixture,canbeaddedwithamaximumpercentageof32%.ItcanmeetthestrengthrequirementsofthestandardP·C32.5cement.Whenthemixingpercentageisdecreasedto25%,thestrengthofthecementcanbeincreasedtothatofP·C42.5cement.Othermainqualityindexesofcompositecement,suchasthesettingtimeandstability,alsosatisfystandardrequirements.TheresultsalsoshowthatmostoftheheavymetalsinthestainlesssteelEAFslagexistinastablespeciation.TheconcentrationofheavymetalsthatleachoutfromthestainlesssteelEAFslagandthecompositecementproductsisfarlowerthanthestandardlimitofhazardouswastes.Themainheavymetal,chromium,existsaslesshazardoustrivalentchromium.Therefore,theriskofheavymetalsleachingoutfromthestainlesssteelEAFslagislow.Theinternalexposureindex(IRa)andtheexternalexposureindex(Iγ)ofthestainlesssteelEAFslagarebothlowerthan1.0,satisfyingthestandardrequirementsofthestatefortheradionuclidesofbuildingmaterials.Therefore,stainlesssteelEAFslagcanbesafelyusedasadmixturetoproducecompositecement.

简介：AhighalloyedVanadis4(V4)steelwasproducedbysprayformingprocessinBaosteel,andthemicrostructureoftheas-sprayedsteelanditsevolutionduringhotrollingandannealingprocesseswerecharacterized.Itwasfoundthattheas-sprayedV4steelhasahomogeneousandfinescalemicrostructurewithuniformdispersionofcarbides.Thehotrollingtemperatureisthekeyfactorincontrollingtheevolutionoftype,morphologyanddistributionofcarbides,aswellasthematrixmicrostructureoftheas-rolledsteels.Theoptimizedprocessingparametersfortheas-sprayedV4steelarerollingat1050℃andthenannealingat900℃.Themicrostructuralevolutionmechanismsduringhotrollingandannealingaredeterminedaccordingtothemicrostructuralanalyasisofthematerialatdifferentstages.