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1、NIPPONSTEELTECHNICALREPORTNo.96July2007UDC699.14-422.1TrendsinProductDevelopmentsofBarsandWireRodsTatsuroOCHI*1SeikiNISHIDA*2MasaakiSUGIYAMA*3JyunTAKAHASHI*3ToshimiTARUI*4AbstractOutlineoftrendindevelopmentofsteelbarandwirerodproductsisguided.Thereisac

2、ertaintendencytowardsbetterfunctionorhigherstrengthofsteelproducts,fewermanufacturingprocessfromcustomers’needswithincreasingimportanceofglobalenvironmentpreservation.Tosatisfytheserequirements,NipponSteelhasbeenkeepingonsupplyingnewproductsofhighperfo

3、rmance.Authorsintroduceseveralexamplesofdevelopedbarsandwirerodsofspecialsteel,highcarbonsteelwiresandthelatestnano-levelmaterialscharacterizationtechniqueswhichsup-portsmicrostructurecontroloftheseproducts.givedesiredstrength.Thus,thesebarsandwirerods

4、arerequiredto1.IntroductionbecapableofensuringgoodperformanceofthemachinepartsforInconsiderationofglobalenvironmentalissues,steelbarsandwhichtheyareused,andatthesametime,tohavegoodworkabilitywirerodsarerequiredtoenabledecreasesintheuseofenvironmen-atdi

5、fferentstagesofthepost-processing.Japanisbyfarattheworldtallyharmfulsubstances,decreasesinautomobileweighttoachieveforefrontintermsofspecialsteeltechnologytorealizebothhighlowerfuelconsumptionanddecreasesoreliminationofheattreat-productperformanceandwo

6、rkabilityatprocessinginthemanufac-mentintheirpost-processingintofinalproducts.Withthisasaback-tureofautomobilepartsinaccordancewitheconomicalrationality.drop,thesesteelproductsarestronglyrequiredtohavebetterfunc-Forexample,aninvestigationintotheworldtr

7、endinthedevelop-tionalpropertiesandhigherstrengthandtoalloweliminationorsim-mentofcarburizingsteel,indispensableforthecomponentsofauto-plificationofpost-processingsteps.NipponSteelCorporationhasmobiledrivelines,overthelast20yearsbasedontechnicallitera-

8、developedavarietyofbarandwire-rodproductsthatmeetthesetureshowedthatJapanwasresponsibleforanoverwhelminglylargewidelyvariedrequirements.Thispaperoutlinesthetrendsinnewshareofnewproductsofcarburizingsteel;70%developedinJapanproductdevelo