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表1-23黑色金属硬度及强度换算硬度抗拉强度σb/MPa洛氏表面洛氏维氏布氏HRCHRAHR15NHR30NHR45NHVHB300D2d10、2d5、4d2.5/mm70.069.569.068.568.086.686.386.185.885.5 10371017997978959 67.567.066.566.065.585.285.084.784.484.1 941923906889872 65.064.5 ......(本文共 5747 字 ) [阅读本文] >>