Graphite crucible is a refractory graphite crucible mainly used for smelting special alloy steel, melting non-ferrous metals and their alloys, which is made of crystalline natural graphite as the main raw material and malleable refractory clay as the binder, which is combined with different types of clinker. The graphite crucible is an integral part of refractory materials in terms of its properties and applications.

Crucibles can be divided into three categories: graphite crucibles, clay crucibles and metal crucibles. Among the graphite crucibles, there are three types: normal graphite crucibles, shaped graphite crucibles and high purity graphite crucibles. The various types of graphite crucibles differ in their properties, applications and conditions of use, as well as in the raw materials, production methods, technology and product type specifications used. The main raw material of graphite crucible is natural graphite in crystalline form. Therefore, it maintains the original physical and chemical properties of natural graphite. It has good thermal conductivity and high-temperature resistance, small thermal expansion coefficient during high-temperature use, and certain strain resistance to rapid heat and cold. The crucible is resistant to acid and alkaline solutions and has excellent chemical stability. The crucible is available in a wide range of models and specifications and can be selected at will, regardless of the production scale, batch size, or variety of melted substances. Graphite crucible, because of the above excellent performance, so in metallurgy, casting, machinery, chemical industry and other industrial sectors, is widely used in the smelting of alloy tool steel and non-ferrous metal and its alloy melting. And it has good technical and economic effect.

The types of crucibles are broadly divided into three main categories: the first type of copper crucible, with the specification "No."; the second type of crucible for copper alloys, with 100 numbers of extra round and 100 numbers of round, and the third type of crucible for steel making, with 100 numbers. The crucible specifications (size) are usually expressed in terms of the size of the sequential number; crucible No. 1 has a volume capable of melting 1000 g of brass and weighs 180 g. The amount of melting in the crucible for melting different metals or alloys can be calculated by multiplying the crucible's capacity specification number by the corresponding metal and alloy coefficients. The raw materials for the production of crucibles can be summarized in three main types. The first is crystalline natural graphite, the second is malleable refractory clay, and the third is calcined hard kaolin-like skeletal clinker. In recent years, high-temperature-resistant synthetic materials such as silicon carbide, alumina and ferrosilicon have been used as skeleton clinker for crucibles. This clinker has a significant effect on improving the quality of the crucible product and increasing the density and mechanical strength of the crucible. There are three methods of forming crucibles, the more primitive and ancient method is hand molding. The second method is spin molding and the third method is compression molding.