简介:Throughsummaryandextractionofcurrentsteelmakingdesign,processandequipmenttechnologiesandproductiontechnologiesfor300tgradeconvertersinBaosteel,thearticleanalyzesandelaboratesthesignificanceofindependentintegrationof300tgradeconvertersinZhanjiang,majortargetsoftheindependentintegrationinconverterprocesstechnologies,equipmentpackagesandcontrols,theinnovatedcriticaltechnologiesandcomparisonwithoverseasadvancedtechnologies,majortechnicaldifficultiesintheintegrationinBaosteelandtheirsolutions,aswellasgeneralmindsetandfinalobjectivesoftheproject.ThetotalintegrationoftechnologyforShanghaiNo.1SteelMakingPlantofBaosteelwasundertakenbyNipponSteel.AndKawasakiSteelwasresponsibleforthetotalintegrationoftechnologyfor4#and5#convertersofShanghaiNo.2SteelmakingPlantofBaosteel.Basedondigestion,absorptionandinnovationoftheintroducedtechnologies,Baosteelhasfirstlyachievedtheindependentintegrationof6#converter,5#RHand3#LFprojectsintheShanghaiNo.2SteelmakingPlantofBaosteel.Therefore,BaosteelshalltakeadvantagesofthefavorableconditionsandexperiencesandadvancedsteelmakingtechnologiesofBaosteeeltomastertheimportednewsteelmakingtechnologiesintheworldandthenformtheadvancedcompletesetsteelmakingtechnologiesandequipmentathomeandabroad.TheachievementofindependentintegrationofZhanjiangSteelMakingProjectwillmakethebreakthroughfortheconstructionoflarge-sizedsteelmakingplantinBaosteel.300tconvertertechnologyintegrationisundertakenbyBaosteelindependentlyininsteadofbytheforeignsideinthepast.
简介:309Lisakindofausteniticstainlesssteel.Thispaperdiscusses309L,whichwassmeltedandrolledinalab.Itsmicrostructuralcharacteristicsinstatesofas-cast,hot-rolling,cold-rollingandsolidsolutionwereinvestigatedrespectivelybyopticalmicroscope(OM).Itisfoundthat309Liscomposedofausteniteandresidualδ-ferriteundertheseconditions,andtheδ-ferritecannotbeeliminatedeasilybyheat-treatment.Itshotplasticityanddeformationresistancewereinvestigatedinaseriesofheatsim...
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:Twothermo-mechanicalcontrolledprocesses(TMCP)includingcontrolledrollingandacceleratedcoolingareproposedfortheproductionofheavygaugeSUS304Lausteniticstainlesssteelplateswithdifferentstrengthsandothercharacteristics.BasedontherecrystallizationmechanismandcarbideprecipitationbehaviorofSUS304Lausteniticstainlesssteel,TMCPprovidesapowerfulmeanstocontrolthemicrostructureandprecipitationofthehotrolledsteelplatebythecontrolledrollingandacceleratedcoolingprocess.Thedislocationdensityandgrainsizearethemainfactorsindeterminingthestrengthofthestainlesssteelplates.Therefore,itisnecessarytostrictlycontrolthehotrollingparameters,includingparameterssuchasthefinishhotrollingtemperatureintherecrystallizationtemperatureregionandthetotalreductioninthenon-recrystallizationregion.Furthermore,inordertoavoidcarbideprecipitationandguaranteetheintergranularcorrosionresistanceofTMCPSUS304Lausteniticstainlesssteel,acriticalcoolingrateafterrollingisdetermined.
简介:通过铁水脱硫→转炉→RH真空精炼→连铸→热轧→酸洗→冷轧→罩退→平整→重卷→消除应力退火等生产工艺,采用C≤0.003%,Si+Als≤1.80%成分体系,成功开发出无取向半工艺电工钢50W300牌号。消除应力退火后产品铁损值P15/50达到2.75w/kg,磁感应强度B5000达到1.68T,达到国标50W300牌号磁性要求。对比实验炉820℃和850℃消除应力退火后磁性能值,850℃消除应力退火后铁损值优于820℃消除应力退火后的铁损值,磁感强度变化不大。工业炉内800℃消除应力退火磁性能值优于实验炉820℃和850℃消除应力退火磁性能值。