Vacuum heat treatment furnace experiment points to note

1. Vacuum furnace should have a fast-cooling devices. Cooling water pressure should be greater than 0.2Mpa, flow should be adjustable.
2. Heating: Put the workpiece, usually the first pre-heated before pumping to 6.67Pa when heated.
3. Heating process, the workpiece will be deflated and the furnace materials, the vacuum decreased.
4. Cooling gas: steel is generally used 99.995% purity nitrogen, high temperature alloys used 99.999 percent nitrogen or argon, titanium using 99.995% argon.
5. Vacuum furnace part of all active connections rubber O-ring sealed connections, the parts are cooled by water.
6. Vacuum tempering, annealing, solution treatment and vacuum vacuum aging process with conventional heating temperature is generally the same as the heating temperature.
7. Quenching the workpiece under vacuum, vacuum quenching oil should be used, this oil has a low saturated vapor pressure.
8. Vacuum furnace maintenance should state in a vacuum or under nitrogen charge to avoid the usually do not inhale, absorb moisture.
9. Domestic vacuum furnace pressure rise rate should not exceed 1.33Pa / h, some foreign enterprises standard 0.67Pa / h.
10. Titanium alloy vacuum furnace process, not with nitrogen as the cooling gas, because of titanium and nitrogen at high temperatures, to form titanium nitride golden yellow.
11. Vacuum heating mainly by radiation, the workpiece should be maintained in the furnace space.