Metal heat treatment process can be divided into the overall heat treatment, surface heat treatment and chemical heat treatment of the three major categories. Depending on the heating medium, heating temperature and cooling method, each major class can be divided into several different heat treatment processes. The same metal uses different heat treatment process, can obtain different organization, thus has the different performance. Steel is the most widely used metal in industry, and the microstructure of steel is the most complex, so there is a wide range of heat treatment process in steel.
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