Heat Treatment Method for Steel Rolling Mill

The heat treatment of steel rolling mill equipment is a process for changing the microstructure and properties of solid steel materials through certain processes such as heating, heat preservation and cooling. Compared with other rolling mill processing technic, the heat treatment of rolling equipment does not change the microstructure inside the workpiece or change the chemical composition of the workpiece,  giving or improving the performance of the workpiece.
It is characterized by the improved internal quality of the workpiece. Heat treatment is particularly important for steel materials. This is because steel materials can produce very complicated phase changes during heating and cooling. Steel rolling mill equipment can control the parameters of heating, heat preservation and cooling processes in the heat treatment process, which can greatly change the structure of steel and give different properties to steel. In the heat treatment of steel rolling equipment, it’s very important to control steel materials, regulate the organization of steel materials, and tap the potential of steel materials.
The basic steel rolling equipment heat treatment process includes annealing, normalizing, quenching and tempering. Annealing is a heat treatment process in which steel is heated to a phase change or partial phase transition temperature, held for a period of time, and then slowly cooled. Normalizing is a heat treatment process in which steel is heated to a temperature above the complete phase change and then cooled in air for a certain period of time.
Quenching is a heat treatment process in which steel is heated to a phase change or partial phase change temperature, held for a period of time and then cooled rapidly. Tempering is a heat treatment process in which the quenched steel is reheated to a certain temperature (below the phase transition temperature), held for a while, and then cooled. The above several process combinations can also obtain a composite heat treatment process, such as quenching steel parts, followed by high-temperature tempering, which is called quenching and tempering.