When we make mechanical parts, due to the requirements of later use, we need to make some changes to the material, such as quenching, annealing, tempering, etc. Today, let me tell you what is annealing in the process of parts processing?
Annealing is a metal heat treatment process in which the metal is slowly heated to a certain temperature, kept for a sufficient time, and then cooled at an appropriate speed. Annealing heat treatment is divided into complete annealing, incomplete annealing and stress relief annealing. The mechanical properties of annealed materials can be tested by tensile tests or hardness tests. Many steels are supplied in the annealed heat treatment state. The hardness test of steel can be tested by Rockwell hardness tester to test HRB hardness. For thinner steel plates, steel strips and thin-walled steel pipes, surface Rockwell hardness tester can be used to test HRT hardness.
The purpose and use of annealing include the following points:
- Improve or eliminate various structural defects and residual stresses caused by steel in the casting, forging, rolling and welding process to prevent deformation and cracking of workpieces.
- Soften the workpiece for cutting processing.
- Refine the grains and improve the structure to improve the mechanical properties of the workpiece.
- Prepare the structure for the final heat treatment (quenching and tempering).
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