1. First is the vacuum oil quenching furnace, which is suitable for vacuum heat treatment of die steel, spring steel, stainless steel, bearing steel, high temperature alloy steel, etc. Its main features are a wide range of applicable materials, strong hardenability, low cost, and reusable quenching oil. The disadvantages are; the deformation is relatively large, and the workpiece needs to be cleaned later. The vacuum oil quenching furnace can be divided into two-chamber furnace and three-chamber furnace from the structure.
2. Vacuum high-pressure gas quenching furnace is suitable for vacuum heat treatment of high-speed steel, stainless steel, die steel and other materials with better hardenability. It is characterized by small deformation of parts and no need to clean after heat treatment. The disadvantages are that the quenching gas cannot be recovered and the cost is high. The structure of vacuum high pressure gas quenching furnace can be divided into two types: horizontal and vertical. The horizontal type can be divided into single room, double room and three room. The vertical type is suitable for heat treatment of ring-shaped, cylindrical and long rod-shaped parts. The quenching pressure of the vacuum high-pressure gas quenching furnace is generally 2b a r ~ 10b a r. According to the needs of users, the parts suitable for the pressure furnace can be selected.
3. Vacuum tempering furnace: The vacuum tempering furnace can be divided into single-chamber, double-chamber and vertical, etc. Generally, the maximum temperature of heating with nickel-chromium belt is 800℃. Vacuum tempering furnace is generally applicable to require that the surface of the parts after tempering is bright and there is no oxidation color.
4. Vacuum annealing furnace: vacuum annealing furnace can be divided into single chamber, double chamber and vertical. The heat treatment furnace can choose medium high temperature and low temperature according to the parts materials (medium high temperature 800℃～1350℃, low temperature 800℃).