... .Quick recovery 3.Third party inspection acceptable Gaphitized petroleum coke for steel, foundry and casting Stable quality Carburizer for special steel, ductile ... delivery; Used in metallurgy industry as reducer, foundry modifier, fireproof ect. Calcined petroleum coke is formed from the by-product of crude ... :0.5-5mm, 1-5mm, 3-8mm, ect. Graphitized Petroleum Coke for Steel, Foudry and Casting