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Vacuum heat treatment can be used for annealing, degassing, hardening heat treatment, quenching, tempering and precipitation hardening. Chemical heat treatment can also be used after the appropriate medium is used.
The heat treatment process generally consists of three processes: heating, heat preservation and cooling. Sometimes only two processes are heated and cooled. These processes are interconnected and uninterruptible.
The quenching and liquid quenching of vacuum are both. Gas quenching is to be cooled by heating the workpiece in a vacuum and filling the cooling chamber with a high purity of the gas (such as nitrogen). It is suitable for high – speed steel and high – carbon – chromium steel with low critical cooling speed
Liquid quenching is the process of heating the workpiece in the heating chamber and moving it to the cooling chamber for high purity nitrogen and immediately into the quenching oil tank and quickly cooling. If high surface quality is required, the annealing and precipitation hardening of the workpiece vacuum quenching and solid heat treatment should still be carried out in a vacuum furnace.