Vacuum heat treatment is a comprehensive technology combining two specialties of vacuum technology and heat treatment, which means that all and part of the heat treatment process is carried out in a vacuum state. my country divides vacuum into low, medium, high and ultra-high vacuum.

Vacuum furnace and intermediate frequency electric furnace have good development prospects in the field of thermal processing, which are used for induction heating of diathermy, rolling, forging, pipe bending, heat treatment (quenching), welding and other processes. So what are the heat treatment skills of vacuum furnace and intermediate frequency electric furnace?

1. When treating titanium alloys in a vacuum furnace, nitrogen should not be used as a cooling gas, because titanium and nitrogen react at high temperatures to form golden titanium nitride.

2. The movable connection parts of the vacuum furnace are all sealed and connected by O-shaped rubber rings, and this part is cooled by water.

3. When the workpiece is quenched in a vacuum state, vacuum quenching oil should be used, which has a low saturated vapor pressure.

4. The maintenance of the vacuum furnace should be in the state of vacuum or pure nitrogen, to avoid inhalation and moisture absorption when not in use.

5. The pressure rise rate of the domestic vacuum furnace should not be greater than 1.33Pa/h, and the standard of some foreign enterprises is 0.67Pa/h

6. The vacuum heating is mainly based on radiation, and the workpiece should be kept apart in the furnace.

7. During the heating process, the workpiece and the materials in the furnace will be out of gas, which will reduce the vacuum degree.

8. The heating temperature of vacuum tempering, vacuum annealing, vacuum solution treatment and vacuum aging is generally the same as that of conventional treatment.

9. The vacuum tempering furnace should have a quick cooling device. The pressure of cooling water should be greater than 0.2Mpa, and the flow should be adjustable.

10. Cooling gas: steel generally uses 99.995% nitrogen, high temperature alloys use 99.999% nitrogen or argon, and titanium alloys use 99.995% argon.

11. Heating up: After placing the workpiece, it is generally pre-pumped to 6.67Pa before heating up.