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Tempering. (in metallurgy), a type of heat treatment, in which a quenched alloy is reheated to a temperature below the first critical point, is held at that temperature, and is subsequently cooled. The term âtemperingâ is mainly applied to steels.
Hardening - Heating the steel to the hardening temperature and cooling suddenly by quenching in an oil bath. Tempering - Reheating the hardened steel to the tempering temperature in order to relieve stress induced in the hardening process, and remove some of the hardness in exchange for toughness.