Steel heat treatment is through a series of process steps such as heating, heat preservation, cooling, etc., so that the organisation of the steel structure changes, so as to achieve the purpose of improving the properties of steel. Specifically, heat treatment can be divided into the following steps:
a. Heating: the steel is heated to a certain temperature, so that it reaches the corresponding organisational state. Usually, this temperature needs to be determined in the steel phase diagram to ensure that the steel in the heating process does not occur thermal cracks or other defects.
b. Holding: After the steel is heated to the set temperature, a certain holding time is required to ensure that the internal parts of the steel to achieve the appropriate organisational state.
c. Cooling: Immediately after the holding time is over, a certain cooling method is used to cool the steel to room temperature. Different cooling methods will lead to different organisational states and properties.
