... petroleum coke , it’s high quality recarburizer . It is high content of carbon , while low sulfur and ash ... . It is used as recarburizer to produce high quality steel , cast ... ,1-5mm,5-10mm,10-20mm,ect.It is made from low sulfur and low nitrogen petroleum ... produce high quality steel , cast iron and alloy . Good quality Artifical graphite carburant for steelmaking