Today, the editor will introduce the quenching and annealing processes. These two processes are two and one arts used to cast steel, and they have different meanings in essence. Friends who don’t understand can learn the following knowledge together to understand quenching and annealing. Annealing difference. Quenching and annealing quenching and annealing process introduction Kehua Induction Heating Equipment
quenching is to heat the steel above the critical temperature, keep it for a certain period of time, and then cool it at a rate greater than the critical cooling rate, so as to obtain an unbalanced structure dominated by martensite (also based on A heat treatment process is required to obtain bainite or maintain single-phase austenite). Quenching is the most widely used method in steel heat treatment. Annealing Kehua Induction Heating Equipment heats the workpiece to an appropriate temperature, adopts different holding times according to the material and workpiece size, and then conducts slow cooling (the slowest cooling rate) to make the internal structure of the metal reach or close to the equilibrium state, and obtain good process performance and Use properties, or prepare the tissue for further quenching. Quenching and annealing The difference between quenching and annealing 1. The temperature is different. The quenching temperature is 800-900°C. The annealing temperature is 600-700°C. 2. Different heat treatment processes Quenching is a heat treatment process in which the workpiece is heated to a certain temperature and then rapidly cooled by a quenching medium. Annealing is a heat treatment process in which the workpiece is heated to a certain temperature, kept for a sufficient time, and then cooled at a suitable rate. 3. Different purposes: The purpose of quenching is to improve the hardness of the workpiece. The purpose of annealing is to reduce hardness, improve plasticity and toughness, and remove residual stress. Quenching and Annealing What is annealing? Annealing heats the steel to a certain temperature and keeps it at this temperature, and then slowly cools it to room temperature. Annealing includes complete annealing, spheroidizing annealing, stress relief annealing, etc. a. Heating the steel to a predetermined temperature, holding it for a period of time, and then slowly cooling it with the furnace is called complete annealing. The purpose is to reduce the hardness of the steel and eliminate the uneven structure and internal stress in the steel. b. Heat the steel to 750 degrees and keep it for a period of time Time, slow cooling to 500 degrees, and finally cooling in air is called spheroidizing annealing. The purpose is to reduce the hardness of the steel and improve the cutting performance, mainly used for high carbon steel. c, stress relief annealing is also called low temperature annealing, heating the steel To 500 ~ 600 degrees, hold for a period of time, slowly cool to below 300 degrees with the furnace, and then cool at room temperature. During the annealing process, the structure does not change, and the internal stress of the metal is mainly eliminated. The above is the introduction of quenching and annealing. They are There is an essential difference between the two, belonging to two processes, but it is also a continuous operation. Have you read the above information?
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