摘要
Thepapermainlydiscussedtheinclusionsandthepurityofmoltensteelandcontinuouscastingslabintapping,argon-bubbling,LFrefining,VDvacuumdegassingandcontinuouscastingtundishprocessesduringthesteelmaking.Atthesametime,theimprovementmeasuresofsmeltingprocesswereindicated.Si-Al-BaalloyandCa-Sideoxidationeventuallywereadoptedin120tconverter.Theamountofthetappingwasabout135t.AfterfeedingAlwireandaddingpremeltedslaginfurnace,pickedupthesampleafterthebottomargon-bubblingwhichhadbeendoneforover5minutes.Thelime,fluorite,calciumcarbideandAlpowderswereusedtoproducewhiteslaginLF.Thenthealloycompositionswereadjusted.FeedingCawireafterthetreatment,andtookoutover5minutes’softconverting.TheVDvacuumdegassingshouldbekeptfor15minutesbellow1.5torr.Afterthat,Cawirecouldbefed.Finally,castingtheslabintothesizeof260mm×2280mm.Theresearchshowed:（1）Inconverterprocedure,thedephosphorizationeffectturnedoutgoodwhentheratioofdephosphorizationwas88.2%.Thefinaloxygenandnitrogencontentssatisfiedthedemand,andtheeffectsofthefinalcontrolandbottom-blowingweregood.（2）DuringtheLFrefiningprocess,thenitrogenseldomadded.Itshowedtheexcellentsealingeffectandtheoptimizationoftechniquesonoperatingwhichhadreachedthedomesticleadinglevel.（3）AftertheVDvacuumdegassingprocess,theSi,Mn,P,O,Ncontentswerealmoststeady.Thesulphurcontentkeptdecreasingto0.003%andthe[H]contentwas1.9ppm.Theeffectofthevacuumdegassingprocesswasgood.（4）Theoxygencontentwascontrolledat11ppminthecontinuouscastingprocess,andthenitrogencontenthadincreasedto53ppmwiththeΔ[N]28ppm.Therefore,inordertopreventthemoltensteelfromreoxidization,theprotectionofthecontinuouscastingshouldbecontrolledrigorously.（5）TheinclusionsthatexistedbeforetheLFrefiningprocessweremostlyMnO-Al2O3-SiO3compositeinclusions
出版日期
2010年11月23日（中国期刊网平台首次上网日期，不代表论文的发表时间）
