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1、河北联合大学硕士学位论文AbstractTinplateisbothsidesarethetinnedcold-rolledsteelsheet.Mainlymadefortank,electricpartswithhighdrawingandhighdeeppunchingproducts.ThequalityofTMBPdeterminesqualityoftinplate,besides,non-metallicinclusionsseverelyinfluencesthequalityofTMBP.Inclusionswhichdestroyedthecon
2、tinuityofTMBP,seriouslydeteriorateitsphysicalproperties.AimingattheHebeiironandsteelgroupTangshanlimitedliabilitycompanywhichusedprocessofBOF-LF-CCtofabricateproductionstainlesssteelbilletwhosequalityconcernsoccurredfrequently,Byconductingtheresearchthathowtocontrolthesizeofnon-metalli
3、cinclusionsinto20μmthroughthecleansteelsmeltingtechnologyandavoidexcessiveinclusionstomaketinplateoccurrolledgecrack.Inordertoanalyseitsfabricatedprocessesandthesize,quantity,type,source,formdistributionofthenon-metallicinclusionsinthecastingblanksystematically,conductingsomeanalysisth
4、roughthemetallographicexperiment,oxygennitrogenanalysis,bulksampleelectrolysis,SEMandenergyspectrumanalysis,andsimulatingthecrystallizerslagentrapmentphysically,exploringthesourceoflargeinclusionsandtheformationmechanismofinclusions,raisingmeasurestooptimizateproductionprocess.Theresea
5、rchconclusionasthefollowing.1)Throughthecalciumtreatment,theT[O]contentwasreducedby34.4ppm,theeffectoffeedingcalciumlinewasremarkable;theT[O]contentattheoutletofLFwas37.8ppm,comparedwiththeformationofrefiningslagofLF,whichwasreducedby84.2ppm;theT[O]contentattundishentrancewas71.5ppm,it
6、wasincreasedby89.2%fromthesteelladletotundish,thesecondaryoxidationofsteelliquidwasserious;TheT[O]contentattundishoutletwas9.5ppmlowerthanthatwasattundishentrance,thestructureoftundishwasreasonable.TheT[O]contentofnormalbilletwas31.4ppm.Comparedwiththeoutstandingcompanieswhofabricatedt
7、inplate,thecapacityofLFrefiningwaslimitedandtheleveloncontrollingtheT[O]contentofbilletwasverylow,therefore,RHrefiningshouldreplaceLFrefining.2)ThenumberofmicroscopicinclusionsattheoutletofLFwas3.9persquaremillimeter,thecapacityofLFrefiningonremovingmicroscopicinclusionswashigh.Throu
