Calcined Petroleum Coke, Graphite Electrode manufacturer / supplier in China, offering Semi-Graphitized High Carbon and Low Sulfur Calcined Petroleum Coke, Graphitized Petroleum Coke 0-1mm GPC Artificial Graphite Sulfur 0.05% Carbon Additives, Artificial Graphite Petroleum Coke for Steel-Making and Foundy Casting and so on.