Calcined Anthracite Coal (Carbon Additive) is mainly used for steel smelting. During the steel smelting process, a small amount of carbon has been burned, and there is oxygen, sulfur and phosphorus just in the middle. After adding the Calcined Anthracite Coal (Carbon Additive), the carbon content of the steel is increased and carbon is added. The carbon in the agent chemically reacts with oxygen, sulfur, and phosphorus in the steel to exert the mechanical properties of the steel.