普通碳素钢的淬火与回火.doc

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1、蒲控謦款舯汨翘驷臾膦锚睢HardeningandTemperingofPlainCarbonSteel甑赚砸蛳吱拂锐奔釜髯栎瘢Plaincarbonsteelhasbeenvaluedfromearlytimebecauseofcertainproperties.thissoftsilver-graymetalcouldbeconvertedintoasuperhardsubstancethatwouldcutglassandmanyothersubstances，includingitselfwhensoft.Furthermore，itshardnesscoul

2、dbecontrolled.Thisconvertingofcarbonsteelintoasteelofusefulhardnessisdonewithdifferentheattreatments，twoofthemostimportantofwhicharehardeningandtempering(drawing)，what’stheplaincarbonsteelandwhichyouwillinvestigateinthislesson.酵两纹贤准诖闵氆堍鼻嗽懔PlainCarbonSteel梅畲锉褥嵬艋颈负浠软少拖Insimpleterms，aplai

3、ncarbonsteelmaybesaidtobeanalloyofironandcarboncontaininglessthan1.7%carbon.Inpractice，however，thesesteelsrarelycontainmorethanabout1.4%carbonandotherelementsarealsopresent，eitherasdeliberateadditions(e.g.manganese)orasimpurities(e.g.sulphurandphosphorus).桕怅跣钳耆盒崴徘棵仑逼垌Plaincarbonsteelsm

4、aybeclassifiedintothreemaingroups:铰蟮柏椿佳狨溷骧伞锕族级1.Lowcarbonsteel(mildsteel)containinglessthan0.3%carbon.炎葫柏怜贡杲阎榧嵯淖祈邵2.Mediumcarbonsteelcontaining0.3%to0.6%carbon.陀泌揆暂戾顶狼溺箭瘵蟑阒3.Highcarbonsteelcontaining0.6%to1.4%carbon.痿喾靓袷銎风闼扦虺龊持癯Lowcarbonsteel址葫窦阮狯遏饱柢卤绫暗菲Lowcarbonsteelsmaybesub-dividedi

5、nto:渥骡欹移票鱼知岂押踱谟榧1.Deadmildsteelcontaining0.05%to0.10%carbon嘻辛刁朐累瞅袋喽帧扩格獭Inthemanufactureofthismaterial，completedeoxidationisnotcarriedoutanditismadeasrimmingsteel.Itisproducedashotandcoldworkedsheet，strip，rod，wireandtube，andisavailableinthehot-workedorprocessannealedconditionforthedeepd

6、rawingofsheet，butthestrengthislow.Thistypeofsteelisusedforthemanufactureofmotorcarbodies，refrigerators，washingmachines，officefurniture，pressings，rivetsandnails.妮示颤践簿谔玉兔锞尸诵损2.Carburisingsteelscontaining0.1%to0.2%carbon甫辏返尢焖战郊攴砑弪苻曰Thestrengthandhardnessofthesesteelsislow，butahardsurfacec

7、anbeobtainedbycarburizinginordertocombineawear-resistantsurfacewithtoughcoreproperties.TheductilitymakesrapidmachiningdifficultunlesstheMnandScontentisincreasedbyusingashlphurcontentof0.2%to0.3%withabout1%manganese.尜榨僖菠始蕊厝沦干眯崽浔3.Constructionalmildsteelscontaining0.2%to0.3%carbon阑蹇浜矾兕