Alternative spelling of case hardened / Hardened by experience.

(metallurgy) Metal that is harder at its surface, due to a case hardening process.

present participle of case harden

(metallurgy) The process of imparting greater hardness to the surface of a piece of metal.

(metallurgy) To impart greater hardness to the surface of a piece of metal.

simple past tense and past participle of case harden

(physics, chemistry) The protection of semiconductor devices from the effects of ionizing radiation.

(of metal) Age hardening; a heat treatment technique to increase the yield strength of malleable materials.

(metallurgy) Designating, or pertaining to, any of various steels that harden when heated to above a red heat and cooled in air, usually in a blast of cold air with moderate rapidity, without quenching. Such steels are alloys of iron and carbon with manganese, tungsten and manganese, chromium, molybdenum and manganese, etc. They are chiefly used as high-speed steels.

(obsolete) To grow more obstinate.