Heat treatment is a method of altering the physical and chemical properties of a material by heating and cooling it, and is widely used in the manufacturing of metals, glass, plastics and other materials. Heat treatment techniques mainly include annealing, quenching, tempering, surface hardening and age hardening, etc. Each method has its own unique applications and effects.Heat treatment processes can significantly improve material properties by precisely controlling the heating and cooling processes to meet the needs of various engineering applications.