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            MDD?????????


            MDD???????????
            ?????????????????????Haynees25????0.05-0.07,??????2mm????????????????300??400??в????????????????????£??????????????????е???????????????

               

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            ????85HB
            ????????850Ma
            ?????90??
            ?????????2MPa

            MDD??????????????
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            5.????????????????????Ч????????????????Ч???????1%???????????????Ч??????0.3%??

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