Carbon enhancer used in casting, can significantly increase the amount of scrap steel, reduce the amount of pig iron or do not use pig iron. Electric furnace melting feeding method, carbon enhancer should be put in with the scrap and other furnace materials, small doses of additions can be chosen to add to the surface of the molten iron. But to avoid large quantities to the molten iron feeding, in order to prevent excessive oxidation and carbon increase effect is not obvious and the castings carbon content is not enough. The amount of carbon additive added is determined according to the ratio of other raw materials and carbon content. Different kinds of cast iron, according to the need to choose different types of carbon enhancer. The characteristics of the carbon enhancer itself choose pure carbon graphitized material, reduce the excess impurities in pig iron, carbon enhancer selection can reduce the production cost of castings.