air-hardening

[ air-hahr-dn-ing ]
/ ˈɛərˌhɑr dn ɪŋ /

adjective Metallurgy.

noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.

Origin of air-hardening

First recorded in 1905–10

British Dictionary definitions for air hardening

air hardening

noun

a process of hardening high-alloy steels by heating and cooling in a current of air Compare oil hardening