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Metal heat treatment technology can be broadly divided into three categories: integral heat treatment, surface heat treatment and chemical heat treatment. According to the different heating medium, heating temperature and cooling method, each category can be divided into several different heat treatment processes.
Different microstructure and properties can be obtained by different heat treatment processes for the same metal.
Steel is the most widely used metal in industry, and the microstructure of steel is also the most complex, so there are many kinds of heat treatment process of steel.
Integral heat treatment is the heat treatment process of heating the workpiece as a whole and then cooling it at an appropriate rate to obtain the required metallographic structure to change its overall mechanical properties. The overall heat treatment of steel consists of four basic processes: annealing, normalizing, quenching and tempering.read more: