regarding full hard, half hard, quarter hard etc

fp_swallow · 发表于 2010-7-29 13:14:38

经典图书

Hi,all
Suchtheexpressionasfullhard,halfhard,quarterhardetcshouldbeoftenseeninthedrawing,whichistoindicatethepropertiesofthematerialweuse,especiallyfornon-ferrousalloy,likecopperalloy,aluminumalloy,steelalloyetc.
Whocangivetheexacttheexplanationaboutit.
Anyideaisappreciatedandwelcome.
Pleasejoinandenjoyit.

chmk20000 · 发表于 2010-7-29 13:18:28

richardqyli
我认为你说的可能是热处理中淬透性方面的，请问是不是这方面的东西？

wx9041 · 发表于 2010-7-29 13:56:05

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.

molo0633 · 发表于 2010-7-29 14:04:30

quarterhard:
(A)Inlowcarboncold-rolledstripsteel,amediumsofttemperproducedbyalimitedamountofcoldrollingafterannealing.(B)Inbrassmillterminology.QuarterhardisoneBandSnumberhardor10.95%reduction.(C)Instainlesssteelterminologytempersarebasedonminimumtensile,oryieldstrength.ForChromium-NickelgradesQuarterHardTemperis125,000T.S.,75,000Y.S.min.

Referringtotemperofalloyscharacterizedbytensilestrengthaboutmidwaybetweendead-softandhalf-hardtemper.

quarterhard四分之一硬（美国形变铜合金的处理记号，1/4硬指厚度压缩率10.9%（对板带材）、截面压缩率20.7%（对丝材）的冷加工处理）
quarter-hardannealing四分之一硬退火
quarterhardtemper四分之一最高硬度的冷轧钢板（容许做小量弯曲和拉伸，其硬度系热处理后经平整获得）

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