In which fields is the annealing process of high frequency induction heating equipment mainly used?
First, in order to reduce the hardness of workpiece steel and bearing steel after forging, the workpiece is heated to above 20-40 degrees Celsius, and then slowly cooled, so that the lamellar cementite in pearlite becomes spherical during the cooling process. , to reduce the hardness of the steel, this phenomenon belongs to spheroidizing annealing.
Second, in order to make the components in the alloy casting evenly distributed, we can heat the workpiece to a certain temperature, but on the premise that it cannot be melted, keep it warm for a period of time to allow the internal components of the workpiece to be evenly distributed and then cool down. To make it achieve certain chemical properties to improve its performance, this heating method is diffusion annealing.
Third, steel castings and welded parts generally have internal stress. We can use high-frequency induction heating equipment to heat them, and the temperature should be below 100-200 °C, and then let it cool naturally. Stress relief.
Fourth, in order to make cast iron containing cementite into plastic cast iron, we can also use induction heating equipment to gradually heat it to a temperature of about 1000 degrees, and let it cool down slowly, so that the internal cementite is It is decomposed into flocculent graphite, and this heating method is graphite annealing.
Fifth, for example, in the process of cold rolling or cold drawing, the hardening phenomenon is found in metal wires and sheets. In order to eliminate this hardening phenomenon, we should immediately control the temperature of the workpiece when it is heated to 50-150 degrees Celsius. To harden the workpiece to soften the metal, this heating method is recrystallization annealing.