Carbon additive is a product that is added to molten steel. Carbon additive includes calcined petroleum coke, graphite petroleum coke, calcined anthracite coal, electrical calcined anthracite, and natural graphite. For the steel-making industry, the most suitable carbon additive is calcined petroleum coke with fixed carbon of 98.5%min. Coaly carbon additive is mainly processed and calcined from washed lump coal. Coaly carbon additive has lower level of carbon content which generally do not exceed 95%. However, lower prices it is widely used in steel-making industry.