Graphite powder is soft and black gray; It has a greasy feeling and can contaminate the paper. The hardness is 1-2, and it can increase to 3-5 with the increase of impurities in the vertical direction. The specific gravity ranges from 1.9 to 2.3. Under isolated oxygen conditions, its melting point is above 3000 ℃, making it one of the most temperature resistant minerals. The chemical properties of graphite powder in silicon manganese alloy at room temperature are relatively stable, insoluble in water, dilute acids, dilute alkalis, and organic solvents; The material has high temperature resistance and conductivity, and can be used as refractory, conductive, and wear-resistant lubricating materials.