Carbon Additive, Graphite Petroleum Coke, Calcined Petroleum Coke manufacturer / supplier in China, offering 90% Sic Size 0-30mm Black Silicon Carbide Used for Steel Making and Foundry Factory, 90% Sic Size 1-3mm Black Silicon Carbide Used for Steel Making and Foundry Casting, Black Silicon Carbide Be Used for Refractory Material in Ceramic Production and so on.