1. Isothermal Tempering: In this method, steel is held at a specific temperature, and a homogeneous structure forms at that temperature. It is then rapidly cooled. Isothermal tempering allows steel to attain specific microstructures.

2. Stress Relief Tempering: This type of tempering is used to relieve stresses on steel materials. The material is heated to a specific temperature and then slowly cooled. This reduces stresses in the steel and enhances its durability.

3. Normalizing: Normalizing is used to regulate the microstructure of steel material. After heating the material to a specific temperature, it is cooled to room temperature through open-air cooling. This helps the steel material achieve a balanced structure.

4. Annealing Tempering: This type of tempering is used to reduce the hardness of steel and improve its machinability. The material is heated to a specific temperature and then slowly cooled.

5. Hardening Tempering: This process is used to increase the hardness of steel and enhance surface durability. The material is heated to a specific temperature and then rapidly cooled.

Each type of steel tempering is used for different engineering applications and requirements, and the choice of tempering method depends on the type of steel and its intended use. Therefore, the selection of which tempering method to use should be made carefully based on the project's requirements.