... -10mm, 0-20mm low sulphur used as carburizer Natural Amorphous Graphite Grain Carbon RaiserFC: 60%min, 70%min, 75%min, 78%min ... according to customers' requirements.We produce the natural amorphous graphite grain of amorphous graphite ore material of lutang, in chenzhou of china ... over the world.The natural amorphous graphite grain is widely used in steel iron making, blake block, and so on, used as ...