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Heat treatment plant process generally includes heating, insulation, cooling the three process, sometimes only heating and cooling the two process. These processes are connected with each other and cannot be interrupted.
Heating is one of the important processes of heat treatment. Metal heat treatment of the heating method is a lot of, the first is the use of charcoal and coal as a heat source, near the application of liquid and gas fuel. Electric heating is easy to control, and no environmental pollution. The use of these heat sources can be directly heated, but also through the molten salt or metal, as well as the floating particles of indirect heating.
When the metal is heated, the workpiece is exposed in the air, often oxidation, decarburization (ie, reduce the carbon content of steel parts surface), and the after heat treatment, surface properties of the parts have very adverse effects. Metal is usually used to heat the atmosphere in a controlled atmosphere, molten salt, and vacuum, and also can be used to protect the coating or packaging method.

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