... Third party inspection acceptable Gaphitized petroleum coke for steel, foundry and casting Stable quality Carburizer for special steel, ductile iron High carbon, low sulphur ... as carburizer for special steel and ductile iron; High carbon, low sulphur; Quick delivery; Used in metallurgy industry as reducer, foundry modifier, ... , 1-5mm, 3-8mm, ect. Graphitized Petroleum Coke for Steel, Foudry and Casting