Graphite is made of natural flake graphite as the main raw material and plastic refractory clay or carbon as the binder. It has the characteristics of high temperature resistance, strong thermal conductivity, good corrosion resistance and long service life. In the process of high temperature use, the coefficient of thermal expansion is small, and it has strain resistance to acute cooling and acute heating. It has strong corrosion resistance to acidic and sexual solutions, has excellent chemical stability, and does not participate in any chemical reaction during the smelting process. The graphite inner wall is smooth, and the melted metal liquid is not easy to leak and adhere to the inner wall of the crucible, so that the metal liquid has good fluidity and castability, and is suitable for various different mold casting. Due to the above excellent properties of graphite, it is widely used in alloy tool steel smelting and non-ferrous metals and their alloys smelting.