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、KwangyukKimPh.DMailto:niResearcherStainlessSteelResearchGroupTechnicalResearchLabatyPOSCOPohangshiGoedongdong1P.OBox36PohangKeaTel:82(0)542206257Fax:82(0)542206915POSCO’sDevelopmentofFerriticStainlessSteelKwangyukKimYoun

2、gwhanKimKwangtaeKimYunyongLee(StainlessSteelResearchGroupTechnicalResearchLab.ofPOSCOKea)Abstract:Memestringentrequirementsfnaturalresourcese.g.supplybottlenecksofnickelaswellaschangesofcustomerdemarepushingtowardsusingf

3、erriticstainlesssteelsontherise.ComparedtothelastdecadePOSCOhasundergonearisingptionofproducingthesegradesbyreachinguptoabout25%oftotalproductioninlastyear.Aswiththeproductiontheconsumptionfeaturesinthesegradesisalsobein

4、gchangedreflectingproductgroupswithhighgrowthpotentialsuchasconsumerdurablesappliances.IndertomeettheneedchangesPOSCOhasincreasedconcernaboutnewtechnologiesalloydesignsapplicationdevelopment.Inthisreviewsomeoftheseexampl

5、esshallbebrieflyintroduced.Keywds:FerriticstainlesssteelalloydesignapplicationdevelopmentIntroduction400seriesferriticstainlesssteelfamilywithironchromiumelementsisnotonlylessexpensivethanthe300seriesbutalsohavingitsmeri

6、tssuchassurfaceglossnesslowthermalexpansionfeatures.Howeverithasalsodemeritssuchascomplexdifficultproductionprocess.ThegrowthofthisfamilyiscurrentlystronglyfocussedonJapanNAFTAinwhichitsvolumeincreaseissodrasticthatitise

7、xpectedtowldaveragegrowthSource:SMR(1)Figure2Nickelpricesvs.300seriesausteniticratioDevelopmentofferriticstainlesssteelsreflectsdemftheapplicationssuchashomeappliancesconstructionelectronicsexhaustparts.430seriesaswellas

8、409Lhavebeendevelopedreflectingthedomesticdemmainlyledbyautomobileexhaustssystemhomeappliances.Inthelastdecadethesupplyofmaterialfstainlesssteelonexhaustsystemshasgrowntomostremarkablyincoldrolledstainlesssteelconsumptio

9、ninthewld.Themainstimulantofthisgrowthhasbeentheenvironmentallegislationinthewldwhichrequiresaseverereductioninharmfulsubstancesintheexhaustgasesemittedbyautomobiles.Newlegislationwillcontinuetosethigherlimitsinthewld.Fu

10、rthermethepresenttrendinboththeEUtheUSAistobringdieselvehicleemissionsdowntothesamelevelasthatofgasolineengines.Theintroductionofadieselparticulatefilter(DPF)possiblyaNOxconverter(DeNOxcatalystOxycat)willaddanother2~3Kgo

11、fstainlesssteelontheexhaustsystems.Asamatteroffactconsideringthat48%ofallpassengercarsproducedin2004inEuropeweredieselpoweredthemarketpotentialonthisareaissubstantial.Neverthlessthemaingrowthdriverfferriticstainlesssteel

12、sffuturemarketshallbeconsumerdurablesappliancesasshowninFigure3.Classifyingtheappliancepartsbytwodifferentcategiesupontheappliedpositionconventionalferriticstainlesssteelssuchas430(BA)havebeenusedfmeoninternalpartsfalong

13、timei.e.washingmachinedrumovenpanelsrefrigeratdosetc.Inthiscasethesegradesarenotexpectedtochangewithothermaterialsduetotheirfeaturessuchashygienicexcellencecosteffectivenessgoodfabricationproperties.Whereastheapplication

14、ofinternalpartsonthismarketisalreadymaturetheexternalapplicationhasjustbecomepopular.Highglossnessstainlesslookofferriticsteelswilldecidethegrowthpotentialbutifthosepricesremainhightheuseofferriticstainlesssteelsfexterna

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