Railway Emergency Clamp heat treatment process
main link of heat treatment
Quenching:
The steel is heated above a critical temperature, such as austenitizing temperature, and then cooled rapidly to change its organizational structure.
The quenching medium is usually water or oil, depending on the composition of the steel and the desired properties.
After quenching, martensite will be formed on the surface of the steel, and bainite may be formed inside, thereby increasing the hardness and strength.
Temper:
The quenched steel is heated to a temperature below the critical temperature, held for a period of time and then cooled.
The purpose of tempering is to eliminate quenching stress, improve the toughness and plasticity of the steel, while maintaining a certain hardness.
The tempering temperature and time can be adjusted according to the desired performance.
Surface heat treatment:
Only the steel surface is heated and cooled to change the surface structure and improve the surface performance.
Surface quenching is a kind of surface heat treatment, which is suitable for occasions where surface hardness and wear resistance need to be improved.
