The main technological factors of casting steel heat treatment:    1. Steel heat treatment consists of three stages: heating, heat preservation and cooling.The determination of its parameters are in place to ensure that the product is based on the quality and cost savings.    (2) of steel heat treatment according to different heating and cooling conditions, the main steel heat treatment: annealing is fire, homogenization treatment, quenching and tempering, solution treatment, precipitation hardening, eliminating stress treatment, and in addition to the hydrogen.    3. Annealing is heat the steel above a certain temperature, heat preservation time and cooling of the heat treatment process.The purpose of annealing is to eliminate the casting organization of columnar crystals, coarse isometric, widmanstatten structure and dendritic segregation, to improve the cast steel mechanical property.4. The organization of the carbon steel after annealing: hypoeutectoid steel casting for ferrite and pearlite, eutectoid steel casting for pearlite, hypereutectoid steel casting of pearlite and carbide.Apply to all grades of steel.