The purpose of heat treatment is to change the internal structure of steel to improve the performance of the steel. Appropriate heat treatment can significantly improve the mechanical properties of steel and extend the service life of machine parts. The heat treatment process can not only strengthen metal materials, fully tap the performance potential of materials, reduce structural weight, save energy and energy, but also improve the quality of mechanical products and greatly extend the service life of machine parts.
Heat treatment process classification: (classified according to the purpose, requirements and process methods of heat treatment as follows)
1. Overall heat treatment: including annealing, normalizing, quenching, tempering and tempering;
2. Surface heat treatment: including surface quenching, physical and chemical vapor deposition, etc.;
3. Chemical heat treatment: carburizing, nitriding, carbonitriding, etc.