laser surface hardening(One of the latest surface treatment techniques is laser surface hardening which has the big advantage that selected areas can be hardened without treating the whole part. 激光表面硬化是最新发明的表面处理技术之一。其最大优点是不必对整个部件而只对所选定的区域进行硬化处理。)
chemical surface treating process(Chemical surface treating processes refer to processes by which metallic surfaces are treated with chemical reagents to achieve desired effects as, for example, acid pickling, alkaline cleaning, passivation, etc. 表面化学处理法指的是使用化学试剂对金属表面进行处理以期获得所希望效果的一些方法，例如酸洗、碱洗、钝化处理等。)
method of case-hardening(In the simplest method of case-hardening the steel articles are packed in boxes containing charcoal and other substances; they are then heated gradually to about 925°C, and maintained at that temperature for several hours. 最简单的表面硬化法是将钢件放人盛有木炭和其他材料的箱子中，然后逐渐加热到大约 925°C， 并在此温度下保持几小时。)
case-hardened steel(Armor plate and parts of rifles, typewriters and automobile engines are a few of the multitude of case-hardened steel components. 装甲钢板，步枪、打字机和汽车发动机的零部件是诸多表面硬化钢零部件中的几例。)
