... , save production cost.1,Usage used to improve the Carbon content in steel-melting and Ductile iron foundry2 ... carbon, low sulfur, with stable effect for improving the carbon content, high absorptivity of carbon.3,apply Used ... electric furnace steel smelting and cast-iron for improving the carbon content4,Grain size normal size0.3-3mm ... 5-10mm or per as customers special requirement. petroleum coke