The purpose of heat treatment after forging is to refine the coarse grains produced during forging, eliminate work hardening and residual stress, reduce hardness, improve cutting performance, prevent white spots from forming inside forging and ensure the required metal structure. Prepare for final heat treatment with mechanical properties. There are six common ones.


Complete annealing eliminates rough and inhomogeneous microstructures and Widmannstatten structures produced during forging, refines grains and eliminates residual stress and hardness of forgings.


Spheroidizing annealing - obtaining spherical cementite and ferrite structure, which not only has low hardness, but also is easy to obtain smooth surface during cutting, and is not easy to deform and crack in subsequent quenching.


Isothermal annealing - not only shortens the annealing time, but also obtains uniform structure and reduces hardness. In important forgings, it can also be used to diffuse hydrogen to prevent the formation of white spots. Post-forging heat treatment of aluminium and copper alloys is usually carried out by annealing process. The aim is to eliminate work hardening, stress and plasticity.


Normalizing - Finer pearlite can be obtained, which can improve the mechanical properties of forgings.


Normalizing and High Temperature Tempering - Eliminate stress during normal cooling and improve plasticity and toughness.


Quenched and tempered forgings have good comprehensive mechanical properties.