Pit type electric vacuum annealing furnace , heat treat furnace
It's a industrial furnace that heats by heating elements in a environment close to the vacuum state. Furnace chamber is sealed by a metal shell or quartz glass bell. The pipe in chamber is connected with vacuum pump system. Chamber vacuum value can be 133×(10-2~10-4)Pa. Inner heating system is resistance wire(tungsten) or high frequency induction heating. The max temperature is probably 3000℃.
Applicable to all kinds of mechanical parts need gas carburizing, carbonitriding and normalizing, annealing, tempering treatment.