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After vacuum heat treatment, the parts have small distortion, high quality, and the process itself is flexible and pollution-free. Therefore, vacuum heat treatment is not only a means of heat treatment for certain special alloys, but also applied in the heat treatment of general engineering steels, especially tools, molds, and precision couplings. After vacuum heat treatment, the service life is greatly improved compared to general heat treatment. For example, after vacuum heat treatment, the lifespan of some molds can be increased by 40-400% compared to the original salt bath treatment, while the lifespan of many tools can be increased by about 3-4 times. In addition, vacuum heating furnaces can operate at higher temperatures and the workpiece can maintain a clean surface, thus accelerating the adsorption and reaction processes of chemical heat treatment. Therefore, certain chemical heat treatments such as carburizing, nitriding, chromizing, boronizing, and multi-element co diffusion can achieve faster and better results.
