2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、1NITROGENINCREASINGOFWKINGPROCEDUREBETWEENSTEELMAKINGCASTINGCHENZhipingDONGHanjun(ShanghaiMeishanIronasnitrogengetpassadefinitecontentitwillfmbabblelossennitrogencanfmpointedinclusiongroupwithTiAletcinthesteelbesidesnitr

2、ogeninsteelcandegradethetoughnessblasticityweldabilityelectricalconductivitymagicconductivityincreasethelostofmagicdelaying.Soweshoulddecreasethecontentofnitrogeninsteelexcepthotenduringsteelstainlesssteelhighqualitystee

3、ldemsthenitrogencontentunder0.008%[1].becausethenitrogenisthechiefpartoftheairsoitiseasytogetinduringthesteelmakingccprocedureitisdifficulttoeliminatebynmalchemicalreactionatnmalconditionsodrainageofnitrogenisstillthepro

4、blemofsteelmaking.TheVDtechnique(e.g.RH)coulddrainapartofnitrogenbutnmallyundertheconditionofhigh.Sonowifwewanttodecreasethenitrogencontentatfirstweneedtodegradethenitrogeninmaterialasfaraswecanthenavoidtheincreasingduri

5、ngeachproceduretappingccarechiefwkingprocedureasnmal.Theseriesofpipelinesteelaretheobjectsinthisresearchthroughgropingthechangefulruleofnitrogencontentineachprocedurewecancreatetheconditionoftheimprovementofproducingdeve

6、lopmentofvarietysteel.2.ProducingofsteelThisexperimentchoseABtwokindsofsteeleachproducedonetime.ThetechnologyrouteswasBOFArLFRHccwegotthenitrogentestspecimentoanalysisbefeaftereachprocedure.Asfollowingtheroutewehaddoneat

7、befetappingbefeafterArblowingafterLFbefeafterRHcctundishaccountingto8places.ThetestspecimenisrackettypeweusedONdevicetoanalysisthenitrogencontentofthescrapewhatwedrillingfromthespecimen.2.1ConverterprocedureThetaskofconv

8、erterprocedureiseliminating[s][p]mainlythecomponentsofthattwoarebothfitfthestardofquality2.2TheconditionofArblowingrefiningBlowingArfromthebottomcost11to22minutesinArblowingstationwedipcalciumline500mperfurnacetheperiodo

9、fLFis29to90minutes.Ifputtingin33432434347484075741525354555657585BOFAr1Ar2LF1LF2RH1RH2CC1CC2工序（BOFArLFRHCC）N含量（ppm）Fig1、theaveragenitrogencontent’schangefultendencyineachprocedureofA2128323234363242356382020406080100CG1A

10、r1Ar2LF1LF2LF4RH1RH2RH3ZJ1ZJ2工序（BOFArLFRHCC）N含量（ppm）Fig2、theaveragenitrogencontent’schangefultendencyineachprocedurefthefirsttimeofA3.2Nitrogencontent’schangefultendencyineachprocedureofBBhadbeenproduced6timescontinuousl

11、ytheaveragenitrogencontent’schangefultendencyineachprocedureisinFig3itfthefirsttimeisinFig4.FindingfromtheresultwecanseethatwhenproducingBitexisted4partsofnitrogenincreasing:(1)tappingfrom20ppmofbefeto32ppmofbefeArblowin

12、gaveragelyitincreased12ppm.(2)Arblowingstationfrom32ppmofbefeto39ppmofafteraveragelyitincreased7ppm.(3)LFfrom40ppmofbefeto43ppmofafteraveragelyitincreased3ppm.(4)ccfrom38ppmofafterRHto46ppmaveragelyitincreased8ppmtheccwa

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