The article introduces the method of superhardening treating hard alloy drawing die core with thermochemistry copermeation method so as to improve its surface hardness.
介绍采用热化学共渗法对硬质合金拉丝模芯进行超硬化处理，以提高其表面硬度的方法。
The Tech. Dept. and relevant persons confirm that the hardness of HB225-305 specified in the Control Plan and the Customer's drawing is correct.
经技术部及相关人员的确定，《控制计划》及顾客图纸要求硬度为HB225-305是正确的。
BASF have developed a new system which provides coatings with improvements in surface hardness as well as better bending and deep-drawing strength.
BASF已经研发了一项新的系统，可以改善涂层表面硬度，并且使涂层有更好的弯曲度和深拉伸强度。
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