... coke for steel, foundry and casting Stable quality Carburizer for special steel, ductile iron High carbon, low sulphur Stable quality; Used as carburizer for special steel and ductile ... , low nitrogen, causing less slag in the furnace. The finished steel and iron have a better quality by using GPC.F. C ... .5-5mm, 1-5mm, 3-8mm, ect. Graphitized Petroleum Coke for Steel, Foudry and Casting