Vacuum tempering furnace

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. Heating is one of the important processes of heat treatment.

There are many heating methods of metal heat treatment, and the first is to use charcoal and coal as heat sources to apply liquid and gas fuel. The application of electricity makes heating easy to control and free of environmental pollution. These heat sources can be heated directly, or indirectly heated by molten salt or metal, or floating particles.

Tempering is the quick cooling of the workpiece in the quenching medium, such as water, oil or other inorganic salt and organic water solution. Harden after hardening, but also become brittle. In order to reduce the brittleness of steel after quenching of steel is higher than the room temperature and under 650 ℃ at some stage in the proper temperature for a long time of heat preservation, again for cooling, this process is called tempering.

Annealing, normalizing, quenching and tempering are the “four fires” in the whole heat treatment, and the quenching and tempering are closely related to the tempering. The “four fires” developed different heat treatment processes with different heating temperatures and cooling methods.