Quench hardening is a heat-treatment process in which steel and cast iron alloys are strengthened and hardened. This is done by heating the material to a certain temperature, depending on the material. This produces a harder material by either surface hardening or through-hardening varying on the rate at which the material is cooled. The material is then often tempered to reduce the brittleness that may increase from the quench hardening process. Items that may be quenched include gears, shafts, wear-resistant blocks, bolts, and mechanical parts in automobiles.

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