Use a vacuum furnace heat treatment process Precautions

1 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.
2 vacuum furnace part of all active connections rubber O-ring seal connection, this section are cooled by water.
3 work hardening in a vacuum state, a vacuum quenching oil should be used, this oil has a low saturated vapor pressure.
4 vacuum furnace maintenance should fill in a vacuum or nitrogen status, avoid usually do not inhale, absorb moisture.
5 domestic vacuum furnace pressure rise rate should not exceed 1.33Pa / h, some foreign enterprises standard 0.67Pa / h
6 vacuum heating mainly by radiation, the workpiece should be kept in the furnace space.
7 during the heating process, the workpiece will be deflated and the furnace materials, the vacuum decreased.
8 vacuum tempering, annealing, solution treatment and vacuum vacuum aging process with conventional heating temperature is generally the same as the heating temperature.
9 vacuum furnace should have a fast-cooling devices. Cooling water pressure should be greater than 0.2Mpa, flow should be adjustable.
10 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.
11 Heating: Put the workpiece, usually the first pre-heated before pumping to 6.67Pa when heated!