The words “quench and temper” are not a technology but just an expression. We have included this paragraph for the sake of completeness and to help those unfamiliar with these processes in absorbing these concepts more easily.
Quenching and tempering are the most fundamental heat treatments available in that most ferrous alloys must first be hardened (quenched) and then tempered to the appropriate hardness. The expression “quench and temper” (or “harden and temper”, which is the same thing) is so entrenched that some of us forget that in a sequence of conventional processes the two are done in different furnaces, with parts transferred, as quickly as possible, from one to the other.
Quenching and tempering are described separately in this section.
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