Definify.com
Webster 1913 Edition
Casehardening
Case′hardˊen-ing
,Noun.
The act or process of converting the surface of iron into steel.
Ure.
☞ 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
.