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1、researchofsteelmakingprocessofcoldheadingsteelinXinsteelSpecialty:MaterialEngineeringName:CaoRuiHongInstructor:YangjunLiuHuiJieAbstractColdheadingsteeliswildlyusedinmanufacturingfasteningpieces,sparepartsofautomobile,engineering,constructure,machineryand
2、electronicetc.Inordertokeepstableproductqualityofcoldheadingsteel,impuritiescontentssuchassulfurandphosphorusshouldbekeepingaslowaspossible;meanwhile,thecontentsofsiliconandmanganesemustbekeptinlowlevelinthesteelmakingprocess.Thispaperinvestigateddeoxida
3、tionprocessing,sulfurcapacityofrefineslagandpickupofsiliconinthecoldheadingsteelmetallurgicalprocess.SpecimenswerecollectedfromtheworksiteandanalysisbychemicalmothodintestingcerterofXinsteel,experimentsofmoltensteeldeoxidized,sulfurcapacityofLFrefiningsl
4、agandpickupofsiliconinmoltensteelwereconductedcombinedwithrelatedthermodynamicmodel.Theresultsasfollow:(1)Thecapabilityofdeoxidationofmanganeseisincreasingalonewiththedecreaseoftemperature,especiallyatcertainlowtemperature.Thedeoxidizingcapacityof0.4%man
5、ganeseequalsto0.5%manganesebetween1540°C-1560°C.0.8%manganesein1600°Cequalsto0.4%manganesein1540°C.whichcorrespondingtothecontentsofoxygeninmoltensteelwas0.065%,0.067%,respectively.Aluminumdeoxidizingabilityisstrongin[%Al]<0.01anddeoxidationcurvechangeso
6、bvious.Thecontentsofoxygenofmoltensteelisdecreasingwiththeincreasingofaluminumcontentsinmoltersteelin1600°C.Whenthecontentsofaluminuminmoltensteelismorethan0.05%,however,thecontentsofoxygeninmoltensteelchangeslittlewiththeincreasingofaluminumcontents.(2)
7、Sulfurcapacityvarieswiththechangingofquaternarybasicity.Asforbinarybasicity,itdidnotshowanyrulewithsulfurcapacity.itiscanbeignoreofMgOimpactonsulfurcapacity.Effectofmainelementsinrefininglagonsulfurcapacityiscalcia,silicaandaluminafromthepointofviewofcom
8、positionofrefiningslagbasicity.Sulfurcapacityisincreasingwiththedecreasingofaluminacontentsinrefiningslagincertainrangeofcontentsofcalciaandsilica.ithasinverserelationbetweensulfurcapacityandaluminaincertainvalueofCaO/SiO?
