What is the purpose of heat treatment of brass? What is the heat treatment process of brass?-Kehua
In the smelting process of metal products, heat treatment is required. The current heat treatment process includes annealing, quenching and tempering. Only after heat treatment can metal products be regarded as qualified products. Next, Kehua will tell you what is the purpose of heat treatment of brass, and what is the heat treatment process of brass? What is the purpose of heat treatment of copper for brass 1. The purpose of quenching is: to obtain high hardness for brass and wear resistance, the hardness of quenched brass is generally up to HRC60~65, but after quenching, internal stress is generated inside the brass, which makes the brass brittle, so it needs to be eliminated by tempering. 2. The purpose of tempering is: to eliminate the internal stress generated during quenching of brass, to stabilize the brass structure; to reduce the brittleness during quenching, and to increase plasticity and toughness. Tempering is a heat treatment process after quenching, and it is also the final process of heat treatment, which has a decisive influence on the final properties and structure of the product. Kehua believes that although the hardness and strength are greatly improved after quenching, the plasticity and toughness are significantly reduced, which is quenching brittleness. 3. The purpose of annealing is to reduce hardness, improve plasticity, improve cutting performance, eliminate internal stress, such as eliminating internal stress in forging and casting, preventing deformation after processing, refining grains, uniform structure, and improving mechanical properties. The purpose of annealing indicated above, not all brass can achieve, but only one or several purposes. Copper heat treatment What is the brass heat treatment process? (1) Low temperature annealing This process is to eliminate cold deformation processing stress and prevent cracking. This process is used for brass containing more than 20% zinc. After cold deformation, residual internal stress will accelerate intergranular corrosion, especially in humid air or gas containing trace amounts of ammonia or ammonium salts. , after staying for a period of time, cracking will occur, that is, 'season cracking'. The temperature is lower than the recrystallization temperature. Generally, the heating temperature is 200~350℃, and the heating time is 1~5h to eliminate cracking defects. (2) The purpose of recrystallization annealing of recrystallization annealing brass is to eliminate cold work hardening and restore plasticity. The advantage is that it can remove the oxide scale on the surface of the part and obtain a clean appearance. Generally, the copper bars used in salt furnaces are oxidized or deformed on the surface after being used for a period of time, resulting in poor contact with the electrodes. They are heated in the salt furnace for a certain period of time, and then water-cooled to obtain a good surface, which is also convenient for alignment. To ensure the normal operation of the salt stove. The process of brass heat treatment includes quenching and annealing. After heat treatment, the toughness of brass can be greatly improved, which will prolong the service life of brass products.