简介：Multiphaseflowcontrolwithelectromagneticbraking(EMBr)iswidelyusedinthecontinuouscastingofsteelslabs.Thebasicaimoftheflowcontrolsystemoftheprocessistodelivermoltensteelfromtheladlethroughthetundish,uppertundishnozzle,slidegate,andsubmergedentrynozzleintothemoldregionwithminimaldefects.Thisrequirestheoptimizationofturbulencelevelsatameniscustoavoidbothanexcessivelyfastflow(whichcreateshighfluctuationsofthemeniscuslevelinadditiontoslagentrapment,surfacenonuniformities,andsurfacedefects)andinsufficientslowflow(whichleadstomeniscussolidification,inadequatefluxinfiltration,andsurfacedefects).Inthisstudy,aEulerian-LagrangianapproachisusedtoinvestigatetheeffectsofEMBrandArbubbleinjectiononthesurfaceflowvelocity.TheresultsshowthathighArinjectionratescanleadtoanincreaseinsurfacevelocity.

简介：TheNo.3slabcaster,whichmainlyprovidesslabstothe5000mmplatemillatBaosteel,wasputintoproductioninDecember,2004.Thesizeofthebiggestslabproducedbythiscasteris2300mminwidthand300mminthickness.Thedesignedoutputofthecasteris2.3Mt/a.Slabsurfacelongitudinalcrackdefects,whichwererelatedtotheheatfluxofthemold,frequentlyoccurredintheearlystageofthestartupofthecaster.Asmildcoolingpowderisbeneficialtotheuniformityoftheshellofinitialslabs,theconcentrationofstressisreduced,andthelongitudinalcrackingonthesurfaceisavoided.Thisstudyevaluatestheperformanceofseveralkindsofpowder,andtheresultsshowthatmoldpowderofhighbasicity,highcrystallizationproportionandlowheatfluxistothebenefitofthereductionofthelongitudinalcracksonthesurfaceandthedefectsofslabs.

简介：Throughphysicalmodelingandnumericalsimulation,theflowfieldinaslabcontinuouscastingmoldwithelectromagneticstirringismeasuredunderdifferentcastingparametersandstirringcurrents.Toqualitativelyevaluatetheflowfieldinthemold,twoindexes,i.e.,moldfluxentrapmentandvelocityuniformity,areproposed.Basedonthesetwoindexes,someoptimizedstirringparametersunderdifferentcastingconditionscanbedetermined.

简介：Fluorineinmoldpowderisknownasharmfultohumanhealthandtheenvironment.Beingtheadvocateofgreenproduction,Baosteeldevelopedanenvironmentallyfriendlymoldpowderwithoutfluorine.Themainproblemoffluorine-freefluxfilmissmallheatresistanceandthustheheattransferintensityofthemoldistoolarge,whichtosomeextenthinderstheincreaseofthecastingspeed.Withtheheatflowsimulationequipment,controllingprecipitationofcrystalinfluxandsolidificationtemperatureproperly,fluorine-freemoldpowderforlowcarbonsteel,whichsubstitutesFwithB2O3,wassuccessfullydevelopedandappliedinindustrialproduction.Theproductionresultsshowthat,byusingboronicfluorine-freemoldpowder,theboronincrementinmoltensteelislessthan1.3ppmforconventionalaluminiumkilledlowcarbonsteel.

简介：Thermalbehaviorofthesolidifyingshellincontinuouscastingmoldisveryimportanttofinalsteelproducts.Inthepresentwork,onetwo-dimensiontransientthermal-mechanicalfiniteelementmodelwasdevelopedtosimulatethethermalbehaviorofperitecticsteelsolidifyinginslabcontinuouscastingmoldbyusingthesequentialcouplingmethod.Inthismodel,thesteelphysicalpropertiesathightemperaturewasgottenfromthemicro-segregationmodelwithδ/γtransformationinmushyzone,andtheheatfluxwasobtainedaccordingtothedisplacementbetweenthesurfaceofsolidifyingshellandthehotfaceofmoldassolidificationcontraction,theliquid-solidstructureanddistributionofmoldflux,andthetemperaturedistributionofslabsurfaceandmoldhotface,inaddition,therate-dependentelastic-viscoplasticconstitutiveequationwasappliedtoaccountfortheevolutionofshellstressinthemold.Withthismodel,thevariationcharacteristicsofsurfacetemperature,heatflux,andgrowthofthesolidifyingshellcorner,aswellasthethicknessdistributionoftheliquidflux,solidifiedflux,airgapandthecorrespondingthermalresistanceweredescribed.

简介：Thisstudyestablishedathree-dimensionalmathematicalmodeltodeterminethefluidflowinaslabcontinuouscastingmoldunderanelectromagneticstirringforce.Theflowstructureanddistributionwerestudiedwithrespecttodifferentcontinuouscastingparametersandstirringcurrent.Basedonthecalculationresults,themoldfluxentrapmentindexinfreesurfaceandvelocityuniformityindexwereusedtoevaluatetheflowfieldinthemold.Thetheoreticalbasisfortheoptimizationoftheflowfieldstructurewasprovided.Thestudyalsosuggestedanoptimizationmethodforelectromagneticstirringparameters.

简介：Aphysicalmodelwithmercuryasanalogwasdevelopedtoinvestigatetheinfluencesofelectromagneticstirring(EMS)onflowfieldinslabcontinuouscastingwhenthesubmergedentrynozzle(SEN)wascloggedwithdifferentcloggingrates(0,10%,25%,and50%).TheflowfieldinmoldunderdifferentEMScurrents(0,40A,and60A)wasmeasuredbyanultrasonicDopplervelocimeter.Theresultsprovedthattheflowfieldinthemoldwasatypicaldoublerollstructureundernon-cloggingSEN.AstheSENcloggingrateincreased,theflowfieldstructurewastransformedfromadoublerolltoasymmetryflow.Whenthecloggingratereached50%,theupcirculationdisappearedonthecloggedside.Thezoneunderthemeniscusnearthenarrowfacewasanon-flowingarea.EMScouldcorrectbiasflowcausedbySENcloggingandimprovethesymmetryoftheflowfieldduringSENclogging.

简介：Bymeansofthenumericalsimulationmethod,themathematicalmodelofinclusionsmovementinthemoldisestablishedundertheconditionofausteniticandferriticstainlesssteelslabproduction.Accordingtothesimulationresults,themainzonesforinclusionparticlesaccumulationwerefoundandmanyfactorsthataffectedfloating-upprobabilityofinclusionparticleswereidentified.Thesefactorsincludetheinclusionparticlesize,thecastingspeedandtheslabwidth,etc.Itisbelievedthattheinclusionparticlesizeisthekeyoneamongthesefactors.

简介：以EM223-16/16-DC.RLY模块元件级的维修实例,阐述了此模块的工作机制,并且通过抄板,将完整的电路图绘制下来,以便各位同行相互学习和交流。

简介：我公司与北钢总院于1997年12月签订了关于合作开发16Mn微合金钢协议,主要目的在于通过铌微合金化改善16Mn钢的力学性能,提高16Mn钢板的性能合格率,以16Mnq桥梁钢作为研究开发的目标。

简介：针对16MnR冷弯裂断,指出轧制温度偏高,取样不规范是造成冷弯裂断的主要原因,提出整改措施。

简介：受原燃料市场以及销售市场影响,鄂钢面临前所未有的压力,因此降低生铁成本成为高炉生产的主要任务。6号高炉通过采用降低矿石成本、降低高炉燃料比等措施,不断探寻低成本冶炼的方法。

简介：1996年12月31日我厂2号高炉停炉大修。炉容仍为300m~3,由原来10个风口改为12个风口。炉底、炉缸采用自焙炭砖——陶瓷砌体,水冷炉底、水冷炉喉钢砖。设计顶压60kPa,料车由2.5m~3改为2.8m~3。1997年2月25日点火开炉,开炉后两个月内未能

简介：介绍了5号高炉消音器的改造情况,及QP-TX气体排散特效消声器的结构和特点。

简介：电炉厂将员工分为三类，根据工作性质的不同分别制定考核内容及要求，体现了责、权、利相结合的原则，明确了各岗位员工的工作职责和工作重点，保证了生产、工作目标的实现。

简介：3号高炉通过优化高炉操作，保持合理的煤气流分布，控制稳定的操作炉型，使高炉综合焦比大幅降低，各项经济技术指标得到改善。

简介：3号高炉在原燃料条件日益恶化的情况下，通过多次试验，在超高炉渣碱度操作上取得突破，使高炉稳定顺行，各项技术经济指标得到很大的提高。

简介：南钢4号1800m~3高炉于2014年1月24日点火开炉,高炉投产后顺利达产达效,随着高炉冶炼强度的提高,2016年上半年,铁口区域冒煤气严重,铁口难以维护,同时大量的煤气外泄严重威胁炉前工的人身安全。2016年10月17日计划检修,采取铁口框架内整体浇注技术、铁口及风口区域压浆技术、加强炉外管理和炉内管理、提高炮泥质量等措施,治理效果显著,煤气火逐渐减小。

简介：本文通过分析2号高炉2段水温差随铁中钛的变化情况，提出铁中钛的理想控制范围为0．08－0．10％在正常护炉时，2段28^#冷却壁水温差与铁中钛无关。

简介：公司有两个废钢料场,均为露天料场。一是北大桥料场,面积21800m~2,地面未硬化,废钢储存量2.5万吨,二是新区料场,面积为8000m~2,地面已硬化,废钢储存量0.7万吨。废钢(洁净废钢)加工方法均采用氧割枪及吹氧管加工,加工能力低,烧损较大,不能适应公司生产发展需要。随着VAMA汽车板投入生产,洁净废钢需求增加,洁净废钢需求量达到26万吨/年;随着VAMA基板产量增加,洁净废钢加工保供难度越来越大。为满足洁净废钢需求,必须对废钢料场