Effects and methods of heat treatment of steel shot: improving the hardness and wear resistance of steel shot

　　Heat treatment of steel shot is a commonly used process aimed at improving the hardness and wear resistance of steel shot to meet the needs of different application fields. The effects and methods of steel shot heat treatment will be introduced in detail below.

　　Effects of steel shot heat treatment:

　　1. Improve hardness: Through heat treatment, the lattice structure inside the steel shot is rearranged, and the quenching hardness of the crystal is improved. Therefore, the hardness of the heat-treated steel shot is significantly increased and it can better resist the pressure and wear of external forces.

　　2. Improve wear resistance: The surface of the heat-treated steel shot forms a dense hard structure, which can effectively improve the wear resistance of the steel shot. During use, the friction between the steel shot and other objects will be reduced, thereby increasing the service life of the steel shot.

　　3. Improve strength: The internal crystal arrangement of heat-treated steel shot is more uniform and the structure is denser. This increases the strength of the steel shot and allows it to withstand greater impact and pressure.

　　Method of heat treatment of steel shot:

　　1. Quenching: Quenching is one of the most commonly used methods in the heat treatment of steel shot. First, the steel shot is heated to the appropriate temperature, and then quickly cooled to room temperature or in a low-temperature medium, such as water or oil. This rapid cooling causes the crystal structure inside the steel shot to change, increasing hardness and strength.

　　2. Tempering: After quenching, steel shot is usually too brittle and hard. In order to reduce its brittleness and improve its toughness, it needs to be tempered. Tempering is performed by heating the quenched steel shot to the appropriate temperature and cooling it to room temperature over a period of time. This reduces hardness and improves toughness and wear resistance.

　　3. Normalizing: Normalizing is by heating the steel shot to the appropriate temperature and then cooling it evenly to room temperature. Normalizing can eliminate residual stress, improve the grain structure of steel shots, and increase uniformity and hardness.

　　4. Annealing: Annealing heats the steel shot to an appropriate temperature, then slowly cools it to room temperature after a certain period of heat preservation. This method can improve the plasticity and toughness of the steel shot and eliminate internal stress.

　　To sum up, heat treatment of steel shot is an effective method that can significantly improve the hardness and wear resistance of steel shot. The heat treatment methods of steel shot include quenching, tempering, normalizing and annealing. Different types of steel shot and application fields may require different heat treatment methods, so in actual operations, appropriate process parameters should be selected based on specific conditions.