Mainly used for the melting and casting of high-temperature alloys, precision alloys, iron-based, nickel based alloys, non-ferrous metals and their alloys under vacuum or inert atmosphere, and can also be used for the smelting and purification of rare earth materials. The working temperature is determined by the material of the crucible. For example, if it is a magnesium oxide crucible, the working temperature can be 1700 ℃, if it is a zirconia crucible, it can be 1900 ℃, and if a graphite crucible is used, the working temperature can reach up to 2000 ℃.