... High carbon, low sulphur, low nitrogen 2.Quick recovery 3.Third party inspection acceptable Low sulphur graphitized petroleum coke Stable quality Carburizer for special steel, ductile iron High carbon, low sulphur Stable quality ... and ductile iron; High carbon, low sulphur; Quick delivery; Used in metallurgy industry as reducer, foundry modifier, fireproof ect. Calcined petroleum coke is formed from ...