外文翻译--连铸地发展.doc

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1、TheDevelopmentofContinuousCasting【连铸】——中英文对照ContinuousCastingFromtheMaking,ShapingandTreatingofSteelbyWilliam，McGraw—HillCompanies,Inc.,2002TheDevelopmentofContinuousCastingContinuouscastingwasdevelopedveryrapidlyaftertheSecondWorldWar.Steel-producersarctodaygenerallyconvincedthatcontinuo

2、uscastingisatleastaseconomicalasingotproductionandcanmatchthequalityofthelatteracrossmuchoftheproductionspectrumforhigh-qualitysteels.Continualdevelopmentofthetechniqueaimedatimprovedsteelcharacteristicsisleadingtoincreasingadoptionoftheprocessinworksproducingspecialhigh-gradesteels.There

3、asonsforcontinuous-castingsystemsare:(1)lowerinvestmentoutlaycomparedwiththatforabloomingtrain(mini-steelworks);(2)about10%moreproductivitythanwithconventionalingot-casting;(3)highdegreeofconsistencyofsteelcompositionalongthewholelengthofthestrand;bettercorequality,especiallywithflatstran

4、ds;highinherentsurfacequality,leadingtosavingsonanotherwiseexpensivesurfacingprocess;(4)highdegreeofautomation;(5)friendliertotheenvironment;(6)betterworkingconditions.TypesofInstallationThefirstcontinuous-castingplantswerealignedvertically;however,withlargercross-sections,increasingstran

5、d-length,and,aboveall,withincreasingpouring-ratesthistypeofconstructionleadstounreasonablebuilding-heights.Thesefactorsalsoleadtoaconsiderableincreaseinthelengthoftheliquidphasewhichhasmetallurgicaleffects.Thelengthoftheliquidphaseinacontinuously-caststrandisdeterminedbythefollowingformul

6、a:L=D2/4x2VcWhereD=strandthickness(mm)x=solidificationcharacteristic(mm/min1/2)Thesevaluesamountto26～33forthewholecoolinglength.Vc=castingrate(m/min)Effortstoreducebuilding-heightfirstledtocontinuous-castingsystemsinwhichmoltenmetalpassedintoaverticalmouldandsolidifiedcompletelybeforebein

7、gbentorwherethestrandhasbeenintheliquidphaseandlatertothebow-typeinstallationwhichhasacurvedmouldandisthesystemmostusedtoday.Verticalsystemsandthoseinwhichthestrandisbentwhencompletelysolidifiedhavelongstraightliquidphasesandcanleadtounacceptablyhighcapitaloutlay.Ho