简介：采用碱熔处理样品，酸化后，移取部分溶液稀释后引入ICP测定ZrO2、TiO2、Fe2O3含量，剩余溶液用强碱分离钛、铁、锰等干扰元素后，EDTA—CuSO4法返滴定Al2O3，终点明显，检测重现性好；

简介：Inthepresentstudy,sampleswereextensivelycollectedthroughoutthestainlesssteelmanufacturingprocess.Thethree-dimensionalmorphologyofinclusionswasrevealedbynon-aqueoussolutionelectrolysis.Thehighconcentrationofaluminuminferrosiliconcausedtheincrementof[Al]sinsteelandAl2O3ininclusions,whichledtothehighermeltingtemperatureofinclusions.ItwasconcludedthattheapplicationoflowAlferrosiliconandcalciumtreatmentcouldpreventtheformationofAl2O3-richinclusions.

简介：ToimprovethemechanicalpropertiesofWC-Al2O3composites,theeffectsoftraceamountofCeO2additivesonthemicrostructureandmechanicalpropertiesoftheWC-Al2O3compositespreparedbyhotpressingwereinvestigated.TheresultsrevealedthattheWC-Al2O3compositesdopedwith0.1%CeO2possessedrefinedmicrostructureandenhancedmechanicalpropertiescomparedwiththatoftheundopedWC-Al2O3composites.TraceCeO2suppressedthedecarburizationofWC,promotedthemicrostructuralrefinement,andimprovedtheinterfacecoherenceoftheWCmatrixandAl2O3.When0.1%CeO2wasaddedtotheWC-Al2O3composites,theeffectofCeO2resultedintheachievementofarelativedensityof98.82%withanexcellentVickershardnessof16.89GPa,combiningafracturetoughnessof9.85MPa·m1/2withanacceptableflexuralstrengthof1024.05MPa.

简介：研究不同碳源下Al2O3-SiC-C铁钩料的性能。分别以球沥青、焦炭和炭黑为碳源,比较了常温下三者的显气孔率、抗折和抗压强度。结果表明,不同种类碳源将对试样的气孔率和抗折强度产生不同程度的影响。

简介：通过改进耐火材料及辅料中Al2O3含量的分析方法,解决了传统分析方法存在滴定终点判断不准、低含量Al2O3分析准确性差的缺点。经大量试验数据证明,改进后的方法可以替代传统分析方法。

简介：ItisfundamentallyimportanttounderstandtheinfluenceofstrainonthedensityofdeformationtwinsinTWIPsteelbecausetwinningisitsdominantdeformationmechanism.ThedeformationbehaviorofaFe-30Mn-4Si-3Al-0.097CsteelhasbeeninvestigatedbyX-raydiffraction(XRD),electronbackscatterdiffraction(EBSD)andtransmissionelectronmicroscopy(TEM)techniques.Samplewithanaveragegrainsizeof10μmwasdeformedincold-rollingwithareductionof10%,20%,30%,40%,50%,60%and70%,respectively.Themechanicalpropertiesofthecold-rolledsampleswerefurtherinvestigatedbytensiletests.Theyieldstrength(σy)andultimate-tensile-strength(σUTS)oftheas-preparedsampleis480MPaand850MPa,respectively.However,undercoldrollingdeformation,thetensilestrengthobviouslyincreaseswithanincreaseinrollingreduction.Thesamplewitharollingreductionof10%exhibitsσyof610MPaandσUTSof-1000MPa.Theyieldstrengthandtensilestrengtharefurtherenhancedupto1320MPaand1378MPaforthespecimenwitharollingreductionof70%,regardlessofthepoorductilityof6.7%.ThedeformationmicrostructureswerestudiedbyEBSDandTEMobservations.Itisfoundthat,withincreasingrollingreduction,theaveragedistancebetweendeformationtwinsdecreasesgraduallywhilethedensityofdeformationtwins(thelengthoftwinboundaryinunitarea)exhibitamaximumvalueat40%cold-rolling+tension.Carefullystatisticsanalysisrevealsgrainorientationiscloselyrelatedtothedeformationtwinsandtheunderlyingmechanismgoverningthetwinningisdiscussed.

简介：铁矿石经浓盐酸和少量的SnCl2溶液加热到45℃溶解后,用SnCl2-TiCl3还原滴定Fe（Ⅲ）,使Fe（Ⅲ）还原为Fe（Ⅱ）,再以K2Cr2O7滴定全铁含量。本方法对实验操作温度,试样溶解酸的选择有一定的要求,宜选用非氧化性强酸在30-60℃溶解矿样。

简介：Thestudyintroducesthechemicalcomposition,mechanicalproperties,physicalpropertiesandproductionprocessesoftheFe-23Mn-2Al-Vausteniticsteel.Investigationsweremadeintotheformationofcracksinthehot-rolledFe-23Mn-2Al-Vsteelplates,withopticalmicroscopy(OM),scanningelectronmicroscopy(SEM)andenergydispersivespectrum(EDS).Theresultshaveshownthatintergranularoxidationinthereheatingfurnaceisthemaincauseofthecracksonthesurfaceofthehot-rolledsteelplates.Thesurfacecrackingcanbelargelyavoidedbycontrollingtheremainingoxygencontentinthereheatingfurnaceandimprovingcontinuouscasting(CC)processestoincreasethethicknessoffineequiaxedgrainlayerofthesteelslabs.

简介：根据南钢已有两套外压缩2万制氧机的现状，对内、外压缩制氧机的流程进行分析、比较，从空分安全性、设备投资、效益以及变负荷生产能力等多个方面进行比较，确定选择再上2万制氧机的型号。

简介：新建的2×1800^3高炉开炉分为三个阶段，第一阶段开炉准备，包括各种原燃料及培训学习准备、做好各种预案；第二阶段做好高炉开炉料的理论配料计算及加料要求；第三阶段点火开炉，包括点火初始风口配置及第一炉出铁要求等。通过精心准备，两座高炉均实现快速开炉达产。

简介：Cr2O3-formingferriticstainlesssteelshavebeenwidelyexploredasintermediatetemperaturesolidoxidefuelcells（SOFCs）interconnects.However,theevaporationofchromiascalemightmigratetoandpoisonthecathode,leadingtodegradationofthecellperformance.Inthisstudy,Ni-Co-Fe-Pcoatingsweredepositedontheferriticstainlesssteelbymeansofacost-effectivetechniqueofelectrolessmethod.Theyareexpectedtobeconvertedinto（Ni,Co,Fe）3O4spinelwithahighelectricalconductivityandCTEmatchwithstainlesssteel,whichcanblocktheevaporationofchromiaformedonsteelsubstrateexposedtothecathodeenvironmentoftheSOFC.TheeffectsofpH,massratioofFeSO4/（FeSO4+NiSO4+CoSO4）andtemperatureofsolutiononthedepositionrate,compositions,surfacemorphologiesandstructuresoftheNi-Co-Fe-Pcoatingswereinvestigated.TheresultsindicatedthatthedepositionrateincreasedwithincreasingpHwhenpHwaslowerthan9andthenreducedwhenpHwashigherthan9.Thedepositionrateincreasedwithincreasingtemperaturewhentemperaturewaslowerthan80℃andthendecreasedwhentemperaturewashigherthan80℃.ThedepositionratedecreasedwiththeincreaseinmassratioofFeSO4/（NiSO4+CoSO4+FeSO4）.ThecoatingsconsistedofNi,Co,FeandP.Thephasestructureofthecoatingwasamorphous.

简介：ThehotductilityofFe-36NiinvaralloywithdifferentadditionsoftheelementceriumwasinvestigatedusingaGleeble-3800thermal-mechanicalsimulatoroverthetemperaturerange850-1050℃,andtheimprovementmechanismofthehotductilitywasanalyzedusingacombinationofSEM,EDS,andOM.TheresultsindicatedthatFe-36Niinvaralloyexhibitedpoorhotductilitybelow1050℃,whichwasmainlyattributedtoweakgrainboundariesandtheactionofgrainboundarysliding.However,thealloyswithceriumcontentsof0.016%and0.024%bothdemonstratedsubstantialimprovementinthehotductilityovertheentiretestingtemperaturerange.Theobservedimprovementofthehotductilityofthealloywith0.016%ceriumat950℃andthealloywith0.024%ceriumat900℃wasassociatedmainlywiththegrainboundarystrengtheningandtherestrictionofthegrainboundaryslidingbecausetheadditionofceriumreducedthesegregationofsulfuratgrainboundariesandrefinedthegrainstructure.Theoccurrenceandaccelerationofdynamicrecrystallizationwerefoundtoberesponsibleforthehighhotductilityofthealloywith0.016%ceriumat1000℃andthealloywith0.024%ceriumat950-1000℃asaresultoftherefinementofthegrainstructurebyadditionofcerium.

简介：TheeffectofCe,LaandmischmetalonthesolidificationstructureofFe-36Niinvaralloywasinvestigated.Theresultsshowthatgreatamountsofhigh-meltingpointcompounds(Ce2O3,La2O2Sand(Ce,La)2O2S)respectivelyformedinthealloywiththeadditionofCe,Laormischmetal.Basedonthetheoryoflatticemisfit,thelatticemisfitbetweenthe(0001)surfacesofCe2O3,Ce2O2SandLa2O2Sand(100)surfaceofFe-36Niinvaralloywere6.21%,5.77%and5.42%,respectively,whicharerelativelylow.Therefore,Ce2O3,La2O2Sand(Ce,La)2O2Scouldserveasthecoreofheterogeneousnucleation,improvetheequiaxedgrainratio,reducetheequiaxedgrainsizeandrefinethesolidificationstructureofalloy.

简介：Thehot-deformationbehaviorofFe-Mn-Ctwinninginducedplasticity(TWIP)steelwasinvestigatedbyconductinghotcompressiontestswithinarecommendedhotrollingtemperaturerangeatvariousstrainrates.Flowresistancecurvesduringhot-deformationwereobtained,andstrainratesensitivitiesandactivationenergiesforplasticdeformationwerecalculatedusingthepowerlaw.ItisfoundthattheadditionofAlandSiclearlyincreasesthepeakstressesforthepresentalloys,especiallyat950℃.ButMnhasaminoreffectonthestress-straincurvesandactivationenergywhenitscontentvariesfrom15mass%to22mass%forthepresentalloys.

简介：Resultspresentedinthisstudycontributetoinvestigationofthemicrostructureandmechanicalpropertiesofthehot-rolledFe16Mn0.6Csteelplates.Thesteelplateshavebeenproducedbybeinghot-rolledattemperaturesrangingfrom1100℃to850℃insevenpassesto97.5%reductioninthicknessandthencooledinafurnaceof650℃.Someplateshavebeenannealedattemperaturesrangingfrom300℃to1100℃for5minto60min,andthenfollowedbywaterquenching.Thereareannealingtwinsinthehot-rolledFe16M...

简介：TheFe-Ti-Nmateralloywaspreparedthroughthein-situreactionofnitrogengaswiththeFe-Timelt.ScanningelectronmicroscoperesultsshowthattheparticlesuniformlydistributedintheironmatrixwereTiN.ThedeliberatelypreparedFe-Ti-Nmasteralloywasemployedforthe409Lferriticstainlesssteelinanattempttorefinetheas-castsolidificationstructure.ItwasfoundthattheeffectivenessofFe-Ti-Nmasteralloyonrefiningoftheas-cast409Lferriticstainlesssteelwasaffectedbyadditionlevel,holdingtimeandmeltstemperature.Itwasfoundthattheaverageequiaxedgrainsizedecreasedfrom1503μmto303μm,theproportionofequiaxedgrainzoneincreasedfrom14%to100%withincreasingtheFe-Ti-Nmasteralloyadditionlevelto2.5%.Theproportionofequiaxedgraindecreasedfrom85%to4%asthesolidificationtemperatureincreasedfrom1803Kto1883K.Whentheholdingtimereachedto8min,thesolidificationstructuresof409Lferriticstainlesssteelshowextremepointsintheproportionofequiaxedgrain.Itisclearthatthegrainrefiningefficiencygraduallyfadeawaywiththeincreasingoftheholdingtimeattheverybeginning.However,whentheholdingtimecontinuestoincreaseandexceedstheextremepoint,thegrainrefiningefficiencyoftheFe-Ti-Nmasteralloyrecoveredtoacertaindegree.Theexperimentalresultsmentionedabovehavebeenanalyzedintermsofthermodynamics.Underappropriateconditions,theFe-Ti-Nmasteralloyusedforgrainrefinementofthesolidificationstructureof409Lferriticstainlesssteelmayhavegoodprospectsforindustrialapplications.

简介：ThemicrostructuralchangesofFe83Si4B13amorphousmotheralloyduringtheheatingprocesswereinvestigatedbyLaserScanningConfocalMicroscopy（LSCM）,andthephasetransformationwasdeterminedbytheThermo-Calccalculations.ThedifferencesinthemeltingpointsmeasuredbyDifferentialScanningCalorimetry（DSC）andLSCM,andthoseobtainedbyThermo-Calccalculationswerealsodiscussed.ItisfoundthatthemeltingpointsmeasuredbyDSCandLSCMarerelativelysimilar,whereastheonsetandendofthemeltingtemperaturescalculatedbyThermo-CalcsoftwarearehigherthanthosemeasuredbyDSCandobservedbyLSCM.

简介：在石灰窑大修过程中对石灰窑存在的薄弱环节采取了一些改进措施，建造新型石灰窑可以从根本上扭转公司石灰生产的被动局面。

简介：针对原燃料条件恶化,制定出各项合理的操作制度,使3#高炉各项技术指标大为改善,特别是节焦效果明显。

简介：目前工业制氧所使用的方法不近相同,采用的控制系统千差万别,仪表选型更是琳琅满目。基于以上原因,本文主要结合酒钢制氧的工艺特点,对DCS自控系统和仪表控制系统进行简单的分析。