Normalizing is a heat treatment process in which the workpiece is heated and austenitized, and then cooled in air or other media to obtain pearlite-based heat treatment. Its purpose is to eliminate the forging stress of the blank and reduce the hardness to improve the machinability. The normalizing process of the workpiece is usually divided into two categories: conventional normalizing and high-temperature normalizing. No matter which normalizing, it can be carried out by an ultrasonic induction heating machine.
Conventional normalizing is a normalizing process that heats steel or steel parts to 30-50 °C above Ac3. It is a normalizing method widely used in heat treatment production. Its application range is as follows:
1. It is suitable for hypereutectoid steel and alloy steel. Through the heating during normalizing and subsequent air cooling or forced cooling, this steel can eliminate network carbides and refine the flaky pearlite structure, which is beneficial to obtain uniform and fine spherical carbides in spheroidizing annealing, so as to improve the steel. organization and performance.
2. It is suitable for low-carbon steel and some low-alloy structural steel. Due to the excessive ferrite in the annealed structure and low hardness, these steels are easy to stick to the knife during cutting, and normalizing (fast cooling speed) is used. A large amount and fine pearlite structure can be obtained, which can improve the hardness of the material and improve the workability. For medium and low carbon steel and alloy structural steel, normalizing can eliminate stress and refine the structure, which can be used as a preparatory heat treatment before quenching instead of full annealing.
3. It is suitable for quenching and repairing parts of some carbon steel and low alloy steel. They use an ultrasonic frequency induction heating machine for conventional normalizing heat treatment, the purpose is to eliminate internal stress and refine the structure, and prevent distortion and cracking during requenching.
4. It is suitable for some ordinary structural parts with low requirements. This type of workpiece has better comprehensive mechanical properties than the annealed state because of its finer normalized structure, and the process is simple, so it is not very suitable for some requirements. For tall common structural parts, normalizing can be used directly as final heat treatment.
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