... special steel and ductile iron high carbon, low sulphur graphite carbon additive stable qualityused as carburizer for special steel ... ironhigh carbon, low sulphurquick delivery Carbon AdditiveGraphitized Petroleum CokeArtificial Graphite ScrapeCarburizerF.C (Min)99%98.5%98%S (Max ... 1-5mm,3-8mm,ect.GPC is also called artificial graphite scraps, characterized by high carbon, low sulphur, low nitrogen ...