Comprehensive data of heat treatment

Heat treatment refers to the metal hot working process in which materials are heated, insulated and cooled in solid state to obtain the expected structure and properties. In the process from the Stone Age to the Bronze Age and the Iron Age, the role of heat treatment was gradually recognized by people.

As early as 770 BC to 222 BC, people in China discovered in production practice that the properties of steel would change due to the influence of temperature and pressure deformation. Softening of white cast iron is an important process for manufacturing farm tools.