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经典图书 网上找到一段有关冷轧的文字,刚好解释了fullhard,halfhard和quarterhard这几个术语:
Coldrolledsheetcanbeproducedinvariousconditionssuchasskin-rolled,quarterhard,halfhard,fullharddependingonhowmuchcoldworkhasbeenperformed.Thiscoldworking(hardness)isoftencalledtemper,althoughthishasnothingtodowithheattreatmenttemper.
Inskinrolling,themetalisreducedby0.5to1%andresultsinasurfacethatissmoothandtheyieldpointphenomenon--excessivestretchingandwrinklinginsubsequentoperations,iseliminated.Thismakesthemetalmoreductileforfurtherformingandstretchingoperations.
QuarterHard,HalfHard,FullHardstockhavehigheramountsofreduction,upto50%.Thisincreasestheyieldpoint;grainorientationandmaterialpropertiesassumedifferentpropertiesalongthegrainorientation.However,whiletheyieldpointincreases,ductilitydecreases.
QuarterHardmaterialcanbebent(perpendiculartothedirectionofrolling)onitselfwithoutfracturing.Halfhardmaterialcanbebent90o;fullhardcanbebent45o.Thus,thesematerialscanbeusedforinapplicationsinvolvinggreatamountsofbendinganddeformation,withoutfracturing. |
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