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。)
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。)
