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1、1AnalysisofNatureSourceofMicroinclusionsinTubeBloomSteelPipesProducedbyHengyangPipeFactyPENGQichun1,CHENBenqiang1,LIGuangqiang1WUHanjun1(1.KeyLabatyfFerrousMetallurgyResourcesUtilizationofMinistryofEducationWuhanUniversi
2、tyofScienceTechnologyWuhan430081China)SHIShaoqing2LIYanghua2XUJingfeng2PENGZisheng2SUNQunbao2NINGJiancheng2(2.HengyangPipeFactyHengyang421001China)Abstract:Thisarticlediscussesthoughlythequantitativechangeparticlesizedis
3、tributionofmicroinclusionsinsteelsamplesbefeLFprocessLFprocessVDprocesstundishtubebloomsteelpipeinHengyangPipeFacty.Theradialdistributionquantitychangeofmicroinclusionsintubebloomtheradiallongitudinalsizedistributionquan
4、titychangealongsteelpipeareanalyzed.Thesourceofmicroinclusionsisdiscussed.Theresultindicatedthatmeasuresshouldbetakensuchasaddingmedeoxidizationaluminumdosageimprovingtundishpowder.Keywds:compactprocessmicroinclusions;ro
5、undbillet1IntroductionTheEAFLFVDHCCprocesssysteminHengyangPipeFactyisapipeproductionlinethathasthespecialacteristics.Itplacesstrictrequirementonthemoltensteelquality.Thisprocessaffectsthefmationofthemicroinclusionsinthem
6、oltenthesizemechanicalbehavithedispersionoftheinclusionscloselyaffecttheproductquality[12].Therefeasystematicstudyisconductedontheprocessmicroinclusionsbehaviindertoguidetheproductiontooptimizethecontroloftheinclusionsto
7、obtainhighqualitytubebloom.2Experimental2.1SteelmakingprocessHengyangPipeFactyhasahizontalcontinuouscastingproductionlineinsuccessionadoptingwiththeEAFLFVDHCCcompactprocesstoproduceroundbillet.LadlerefiningfurnaceVDvacuu
8、mdegassingplantwirefeedersoonrefinefacilityareappliedinsecondaryrefining.Argonblowingintheentireprocessprotectivecastingareappliedintheladle.3good.FromLFtoVDthenumberofthemicroinclusionsincreasedslightly.Thisincreaseisre
9、latedeithertotheoperationalprocesstotheeffectofinsufficientvacuumingtotheinsufficienttimeofvacuuming.ConsequentlytheproductionfacilitymanagementshouldbeenhancedtoinsuretheproperVDtreatmentconditionsufficienttimeofvacuumi
10、ngprocesswhichinturnwouldimprovetheremovalofmicroinclusionsinVDprocess.010203040506070809020μmThepercentagefinclusionswithdifferentparticlesize%LF10AfterLFAfterVDTundishTubebloomSteelpipeFig.2Theparticlesizedistributiono
11、fmicroinclusionsfeachprocessFromLF(afterVD)totundishstagethenumberofmicroinclusionsincreasedsubstantiallywhichindicatestheoxidesintheliningslagdecomposedemittedoxygenintomoltensteeltherefecontaminatedthemolten.Thenumbero
12、fmicroinclusionsinsteelslightlyincreasedfromtundishstagetotubebloomstageindicatingthateitherthemoltenwasnotinsulatedwellfromairwasreoxidizedtherewastundishpowderentrapment[34].Becauseoftherelativelylowdepthofmoltensteeli
13、nthetundishlargeamountoftundishpowdercarryoverlowabilityofabsbingmicroinclusionstheprotectiveslaginthetundishpowderentrapmentreoxidationwererelativelyseveretheamountofmicroinclusionsinsteelincreased.Fromtubebloomstagetos
14、teelpiperollingstagesomeinclusions(suchasMnSAl2O3)aredefmedcrashedbyrollingstresssothenumberofinclusionsslightlyincreased.Theamountsizeofthemicroinclusionschangedinrespectthattheinclusionsaregoingfloatingupinsecondaryref
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