The general process of steel casting production is modeling and melting - casting - forming - annealing or normalizing - Roughing - quenching, tempering - finishing. Annealing or normalizing of cast steel is usually performed in the foundry. In the process of manufacturing steel castings, heat treatment is not necessary, so what do we need to know about such an important process? According to the provisions of GB5615-85 heat treatment state name: Z- cast, T- said, Q- said the annealed stress relief annealing, J- uniform return state and W- stabilization return state and Zh- normalized, quenched tempered C-, H-, Ch-, G- precipitation hardening state solution heat treatment state. The heat treatment process of cast steel is the process parameter of concrete heating, insulation and cooling in the process of heat treatment according to the law of microstructure transformation during the process of heating and cooling. According to the heating and cooling mode and the microstructure and properties of different heat treatment process of steel can be divided into: (1) the ordinary heat treatment, including annealing, normalizing, quenching and tempering; (2) surface treatment, including surface quenching and chemical heat treatment; (3) a special heat treatment, including heat treatment magnetic field, heat treatment etc.. According to the location and function of heat treatment in the production process of parts, heat treatment can be divided into: A, preparatory heat treatment, mainly annealing, normalizing, etc., B, final heat treatment, mainly quenching, tempering and so on.
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