... steel and ductile iron; High carbon, low sulphur; Quick delivery; Used in metallurgy industry as ... a filler. GPC is also called artificial graphite scraps, characterized by high carbon, low sulphur, low nitrogen, ... causing less slag in the furnace. The finished steel and iron have a better quality by using GPC ... 5mm, 3-8mm, ect. Low Sulphur Graphitized Petroleum Coke/Gpc