海量资源,尽在掌握
 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 (共 5747 字) [阅读本文] >>