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What is the difference between tempering and annealing? What is meant by annealing and tempering of steel?

by:Kehua     2022-08-02
Tempering and annealing of steel are two different heat treatment processes. What do annealing and tempering of steel refer to? What is the difference between tempering and annealing? Presumably many friends don’t know it! If you want to know more, follow Kehua Let's take a look together! 1. The difference between steel tempering and annealing Steel annealing and tempering have the same purpose and different functions. The main function of annealing is to soften the metal and enhance the toughness, which is used in various metal processing; tempering is mainly used to reduce the brittleness of steel parts after quenching. The difference between tempering and annealing 2. Steel annealing Steel annealing is to heat the steel to an appropriate temperature, keep it for a certain period of time, and then slowly cool it to obtain a heat treatment process that is close to the equilibrium structure. The purpose of annealing is to eliminate structural defects, improve the structure, homogenize the composition and refine the grains, improve the mechanical properties of the steel, reduce the residual stress; at the same time, it can reduce the hardness, improve the plasticity and toughness, and improve the machinability. After annealing the blanks of most machine parts, tools and molds, the internal stress and compositional inhomogeneity of castings, forgings and weldments can be eliminated; the mechanical properties of steel can be improved and adjusted, and the organization can be prepared for the next process. . For parts with low performance requirements and less important parts, as well as some ordinary castings and weldments, annealing can be used as the final heat treatment. The difference between tempering and annealing 3. Steel tempering Steel tempering is a heat treatment process in which the quenched steel is heated to a certain temperature, kept for a certain period of time, and then cooled to room temperature in an appropriate manner. Tempering of steel is the next heat treatment process following quenching, which determines the structure and properties of the steel in use, and is related to the service life of the workpiece. It is a key process. The main purpose of tempering is to reduce or eliminate the quenching stress; to ensure the corresponding structural transformation, so that the size and performance of the workpiece are stable; to improve the thermal properties and plasticity of the steel, and to choose different tempering temperatures to obtain the appropriate hardness, strength, plasticity or toughness. Cooperate to meet the performance requirements of different workpieces. The above is the difference between tempering and annealing brought by Kehua? What do annealing and tempering of steel refer to? I believe everyone knows it. Tempering and annealing are high-temperature and high-heat operations, and the staff must be careful during the operation to avoid accidents.
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