casehardening
表层硬化
材
表面硬化
材
Casehardening \Case"hard`en*ing\, n.
The act or process of converting the surface of iron into
steel. --Ure.
Note: Casehardening is now commonly effected by cementation
with charcoal or other carbonizing material, the depth
and degree of hardening (carbonization) depending on
the time during which the iron is exposed to the heat.
See {Cementation}.