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