简介：Ferriticstainlesssteel(FSS)forvariousapplicationswasdevelopedonthebasisofThermo-calcsimulation.Alloydesign,precipitateanalysisandprocessingparametersoptimizationwerecarriedoutonthebasisofthesimulationresultsaccordingtothetechnicalrequirementsoftheapplications.Thesedevelopedproductshaveoutstandingproperties,suchasmechanicalstrength,ductility,formability,weldabilityandcorrosionresistance.BaosteelhasformedaseriesofFSSproductswhichwillincreasetheprofitofthecompanyandenhancetheproductvarietyofstainlesssteel.

简介：BasedonthecharacteristicsofferriticSUS430heatinganddeformation,andcombinedwiththefeaturesofthe1780mmhot-rollingmill,aroughingmodelwasintroducedintwoaspects:optimizingtheroughrollingpassesandimprovingthewidthcontrolprecision.Throughreducingtheroughrollingpasses,theroughrollingtimecanbeshortened,theprecisionrollingstartuptemperaturecanberaisedandtheyieldofthehot-rolledproductscanbeincreased.Moreover,onthepremisethattheslabwidthfluctuationwasgreat,theprecisionofthewidthcontrolcanbeimprovedthroughoptimizingtheparametersofthehot-rollingwidthcontrolmodel.Theresultshowsthattheoptimizationandperfectionoftheoriginalrollingprocessofthestainlesssteel430seriesfurtherimproveditscapacityandproductquality.

简介：Thispaperdescribesthealloydesignphilosophyfortheimprovementoflong-termcreepstrengthoftemperedmartensitic9Crsteel,includingweldedjoints.Thecreeplifetrisinverselyproportionaltotheminimumcreeprateεmintimestheincreaseincreepratebystraindlnε/dεintheaccelerationregionastr=1.5/[(εmin)（dlnε/dε）].Theparametersεminanddlnε/dεarecloselycorrelatedwiththetimetominimumcreepratetmandthestraintominimumcreeprateεm,whichcharacterizethecreepdeformationbehaviorinthetransientregion.Theboundaryandsub-boundaryhardeningisshowntobethemostimportantstrengtheningmechanismincreepof9Crsteelandisenhancedbyfinedispersionsofprecipitatesalongboundaries.TheadditionofboronreducesthecoarseningrateofM23C6carbidesalongboundariesnearprioraustenitegrainboundariesduringcreep.Theenhancementofboundaryandsub-boundaryhardeningincreasesthetmanddecreasestheεmin,whichimprovesthecreeplife.Theboundaryandsub-boundaryhardeningissignificantlyreducedinfine-grainedregionofheataffected-zone（HAZ）ofconventionalsteelP92weldedjoints,promotingTypeⅣfracture.InNIMS9Crboronsteelweldedjoints,thedistributionofcarbonitridesalongboundariesaresubstantiallythesamebetweentheHAZandbasemetal,suppressingtheTypeⅣfracture.

简介：Abstract:Inrecentyears,withattentionpaidtoglobalenvironmentalproblems,therehavebeenrequirementsforcontinuousimprovementofautomobilefueleconomyandexhaustgaspurificationrate.Thepropertiesoftheferriticstainlesssteels(FSS)usedtomakeautomobilepartshavebeenimproved.Thispaperintroducestheconstructionofautomotiveexhaustsystemsanddescribestheirmainfailurebehaviorsandcorrosionevaluationprocedures.

简介：Theinfluenceofthevolumefractionoftemperedmartensiteonmagnetomechanicaldampingoftheferriticmatrixindual-phasealloyswasstudied.Theexperimentalresultsshowedthat（1）dual-phasedampingalloyisofgoodcombinationofstrengthandtoughness:（2）gooddampingca-pacity(Q-1≥5.0×10-3)canbeobtainedindual-phasealloysonlywhenthevolumefractionoftemperedmartensitewascontrolledproperly.Theeffectofmartensiteonmagnetomechanicaldamp-ingoftheferriticmatrixwasanalysed.Thedampingcapacityofdual-phasealloyswasrelatedtothevolumefractionVmoftemperedmartensitebyQ^{-1=Q-1（1-Vm/1+BVm）atsmallvibrationstrainamplitudesεA≤5.0×10-6.}

简介：Ultrapureferriticstainlesssteelhasmoreadvantagesintheperformancethantheordinaryferriticstainlesssteelbecauseofultralowcarbonandnitrogencontent,suchascorrosionresistance,toughnessandweldability,etc.Suchsteelhasthereforebeenappliedinmanyfields,leadingtotheveryrapiddevelopmentoverthepast40years.Thisstudyfocusesonthesecondaryrefiningprocesswhichisthemostimportantstepofthewholesteelmakingprocessfortheultrapureferriticstainless.Firstly,somedifficultiesofthesecondaryrefiningprocessaredescribed,includingthehighpurificationintermsofbothcarbonandnitrogencontents,highefficientandstablecontrol.Secondly,thedevelopmentandprogressofthesecondaryrefiningtechnologyforultrapureferriticstainlessisintroducedintermsoftherefiningequipments,metallurgicalprocessandassistanttechnologies.Finally,theprospectwasmadeforthedevelopmentofsecondaryrefiningprocessforultrapureferriticstainlessinthefuture.

简介：Thisstudyexaminesmechanismsforprovidingnucleitoequiaxedgrainsintheweldsofpureferriticstainlesssteel(FSS).TheadditionofthealloyelementTitopureFSS439causestheprecipitationofTiN,whichcanbenefitthecolumnar-to-equiaxedtransition(CET)ofgastungstenarcwelding(GTAW).Meanwhile,theinitialmorphologyoftheprecipitates,theconcentrationmultiplicationsofTi,N,etc.ofFSS439shouldbecontrolledtoinducetheformationofCETduringtheshortweldingprocess.

简介：Traditionally,austeniticstainlesssteels304and316havebeenemployedincoastalregionsasroofingmaterialsunfortunately,theyareexpensiveandnotfullyresistanttopittingcorrosionunderseverecoastalcorrosiveenvironment.AferriticstainlesssteelB445Rwasdeveloped.Comparedwithaustenitic316L,B445Ris①lesscostly;②uperiorcorrosionresistantwithminormaintenanceforlong-termservice;③insusceptibletothermaldistortionintheweldingseam.B445Rsheetshowsahigheryieldstrengthandlowertensilestrength,lowerelongationandlowerwork-hardeningthanaustenitic316L.Itcanbeeasilyfabricatedanddeformedjustlikeplaincarbonsteel.Afterbending180o,thereisnooccurrenceof'cracking'ornoticeable'orangepeel'.Theformabilityoftheweldingseamisalsosatisfactory.ThepittingpotentialofB445Ris650mV,largerthanthatof304and316L,asshowninFig.1.ThecorrosionrateofB445Rsubmergedin6%FeCl,solutionis0.3-0.56g/(m2?h-1),muchlowerthanthatof316L,asshowninFig.2.ThesuperiorpittingcorrosionresistanceofB445RcanbeascribedtosynergeticeffectofhigherCrandMo.Dull-finishedB445RsheetshavebeenemployedastheroofingmaterialsforGuangzhouAsianGamesArena,asshowninFig.3.About380tof1.0mmB445Rwithdullfinishwasusedforroofingpanels.About100tof0.8mmB445Rwithhairlineorfluororesinpaintfinishwasusedforsidewallpanels.Thecompositeroofbuild-up（fromuptobottom）includes:①shinglesofferriticstainlesssteelB445R;②Kalzip-typestandingseamofaustenitic304;③water-proofDFM;④structuralsteel;⑤75mmthickinsulation;⑥secondarypurlinof150mm×100mm×4.5mmofgalvaniziedQ235;⑦0.8mmthickprofiledeckofgalvaniziedQ235;⑧acousticinsulation.Theroofingshinglesorpanelswiththesamewidthbutdifferentlengthwereformedbybendingfoursidesandfixedtoa'L'shapereinforcingframesofstainlesssteelbyfasteners.The'L'frameswasconnectedtoribsofthestandingseambyacl

简介：Inordertomeetthedemandsofservicelifeandthesyntheticalperformance/priceratioofstainlesssteelinthesolarwaterheaterindustry,thelowmolybdenumultra-pureferriticstainlesssteel(FSS)B445J1MwasdevelopedatBaosteel.Inthisstudy,comparativestudieswerecarriedoutonthemechanicalproperties,theformabilityandthecorrosionresistanceofB445J1M,304and444,andtheadvantagesandapplicationfieldsofB445J1Mweresummarized.

简介：Abstract:Theoxidescalestructureof443NThot-rolledstripswasanalyzed.Thepicklingof443NTstainlesssteelwassimulatedviathe6σexperimentaldesign.Theresultsindicatethatparabolicrelationsexistbetweenthepicklingscoresandsomeofthepicklinginfluencingfactors,suchasthenitricaciddensity,thehydrofluoricaciddensityandthepicklingtemperature.Effectivepicklingof443NTcanbeachievedbycontrollingthepicklingprocessingparameterswiththeHNO_3densityrangingfrom80g/Lto180g/L,theHFdensityfrom20g/Lto40g/Landthepicklingtemperaturefrom45℃to60℃.

简介：

简介：由使用焊接电线的镍，焊接弧的以铁酸盐为主要成的可锻的铁的部分熔化地区(PFZ)和焊接金属的机械性质的寒心的趋势上的alloying的效果系统地被学习了。在这个基础上，为以铁酸盐为主要成的可锻的铁(QT400-17)的弧焊的一个新镍电极第一次被开发。它的焊接金属的机械性质能以铁酸盐为主要成的可锻的铁匹配那些。在PFZ的碳化物层(WCL)的宽度显著地被减少，焊接关节有优秀马赫无能，焊接金属有高热的抗碎裂性。(编辑作者摘要)3个裁判员。

简介：Exhaustemissionregulationsoftheautomotiveareenforcedineachcountrytopreventairpollutionandglobalwarming,andtherestrictionstandardtendstobecomeseverer.Varioustechniquessuchasthecombustionimprovementofgasoline,upgradesofthecatalyst,andthethermalcapacitydecreasesintheexhaustlinesareadoptedtosuittheregulations,andtheseleadtoanincreaseofthemaximumtemperatureoftheexhaustgas.Recently,ferriticstainlesssteelsaremainlyusedtopartsofexhaustlines,astheirthermalexpansioncoefficientissmall,andthecyclicoxidationresistanceandthethermalfatiguepropertyarebetterthanausteniticstainlesssteels.Thispaperpresentsnewlydevelopedheat-resistantstainlesssteelsfromNisshinSteelforexhaustlinesusage,anddescribesthecurrentsofthesteeldevelopmentthatcouldbeenvisagedinthefuture.Withregardtoimprovingthehigh-temperaturestrengthofferriticstainlesssteels,theadditionofNb,MoandCuiseffectiveinsolutionhardeningandprecipitationhardeningat700℃,whiletheadditionofNb,MoandWiseffectiveinmainlysolutionhardeningat900℃.TheadditionofCr,SiandMnsuppressthebreakawayoxidationinairat950℃upto200hofferriticstainlesssteelscontaining14%Cr.Especially,theadditionof0.8%orhigherMnwouldeffectivelyimprovetheadherenceofoxidescale.Itisconfirmedthatferriticstainlesssteels,NSSHR-1(14Cr-lMn-0.9Si-Nb)andNSSHR-2(10Cr-0.9Si-Nb-Ti),ishavingasuperiorheatresistance,formabilityandcostperformancecomparedtoconventionalType441andType439respectively.

简介：Abstract:Inordertounderstandtheeffectofthesolidificationstructureontheformabilityofultralowcarbonferriticstainlesssteel(FSS),thisworkstudiestheridgingphenomenonandthedeep-drawingpropertyindetailandtheresearchmethodwasX-raydiffraction(XRD)andscanningelectronmicroscope(SEM)technique.Theresultshowsthatthecolumnargrainspecimenhadahigherridgingheightthantheequiaxedgrainspecimen,whichwasmainlyattributedtotheformationofgraincoloniesinthecolumnargrainspecimen.Afterfinalrecrystallizationannealing,theequiaxedgrainspecimenobtainedahigh-intensityγ-fibertextureandanexcellentdeep-drawingproperty.

简介：Abstract:Theeffectofstabilizingelements,suchasNbandTi,onthemicrostmctureandpropertiesoflowcarbonferriticstainlesssteel(FSS)hasbeeninvestigated.TheresultsoftheThermo-calcsimulationhaveshownthattheinterstitialelements,suchasCandN,maybecompletelystabilizedbytheadditionofNbandTi.WiththeincreaseofNbandTicontents,thea+γtwophasesgraduallytransfertoasingleα-phaseunderahightemperaturecondition,andthecontentofthecarbideM_(23)C_6graduallydecreases.ThemicrostructurehasindicatedthatthecombinedadditionofNbandTicanpromotetherecrystallizationofthebandstructureandformmoreuniformequiaxedgrains.Also,withtheincreaseofNbandTicontents,theelongation,ther-valueandthecorrosionresistanceofcold-rolledandannealedsheetsareimprovedprominently.IncomparisonwiththeeffectofTi,theadditionofNbismorebeneficialtotheincreaseofr-valueandthecorrosionresistance.

简介：Nanocrystallineoxidedispersionstrengthened(ODS)ferriticsteelpowderswithnominalcompositionofFe-14Cr-3W-0.3Ti-0.4Y2O3aresynthesizedusingsol-gelmethodandhy-drogenreduction.AtlowreductiontemperaturetheimpurityphaseofCrOisdetected.AthigherreductiontemperaturetheimpurityphaseisCr2O3whicheventuallydisappearswithincreasingreductiontime.ApureODSferriticsteelphaseisobtainedafterreducingthesol-gelresultantproductsat1200℃for3h.TheHRTEMandEDSmappingindicatethattheY2O3particleswithasizeofabout15nmarehomogenouslydispersedinthealloymatrix.ThebulkODSferriticsteelsamplespreparedfromsuchpowdersexhibitgoodmechanicalperformancewithanultimatetensilestressof960MPa.

简介：Thedull-finishferriticstainlesssteel(FSS)sheetB445RforarchitecturalroofinghasbeendevelopedbyBaosteel.ThissteelproductexhibitsexcellentcorrosionresistancesuperiortothatofSUS316Lwithalowercost.Itcanbeeasilyformedintoroofingpanelsbyordinaryprocesses.Moreover,thethermalstrainofitislessthanSUS316Lbecauseofitslowerthermalexpansioncoefficient,anditsreflectivityislowerduetothedull-finishtreatment.Allofthesefeaturesmakeitcapableofbeingusedasarchitecturalroofingmaterialsincoastalregions.

简介：TheinfluenceofTiandNbonthemicrostructure,mechanicalproperties,andsecond-phaseprecipitationof430ferriticstainlesssteelwasinvestigated.Inadditiontoopticalmicroscopy,transmissionelectronmicroscopyandX-raydiffractionanalyses,tensiletests,andcarbonitrideextractionexperimentswereconductedtoinvestigatethemicroscopicmechanisms.TheresultsshowedthattheprimaryprecipitatesinSUS430ferriticstainlesssteelwereCr23C6,Mn23C6,andCr7C3,andtheprimarystrengtheningmechanismwasprecipitationstrengthening.WhenTiwasaddedseparately,themainprecipitateswereTiCandTiN.However,coarseTiCadverselyaffectedthemechanicalpropertiesofsteel.Whendouble-stabilizedwithTiandNb,coarseTiCwasreplacedbyfineNbC.Thetypeofprecipitationwasaltered,andprecipitationandsolidsolutionstrengtheningoccurred.Therefore,thetensilestrengthandplasticstrainratio（r-value）improvedto433.60MPaand1.37,respectively.

简介：Thisstudyinvestigatesthecorrosionpropertiesof0Cr11Tiand0Cr11NbTiferriticstainlesssteels(FSS)forautomotiveexhaustsystems.Theresultsindicatethatthebasemetalandweldseamof0Cr11NbTisteelexhibitbetterintergranularandcondensatecorrosionresistantpropertiesbecausecarbonandnitrogenarestabilizedbyNbandTi,andtheprecipitationofCrcarbideisretardedingrainboundaries.

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.