Injongo: IGraphite petroleum coke GPC yenziwe ngecoke yepetroleum ekumgangatho ophezulu. Luhlobo oluphezulu lwe-agent ye-carburizing, enekhabhoni esisigxina ephezulu, isulfure ephantsi, uthuthu oluphantsi, izinga eliphezulu lokufunxa kunye nezinye izibonelelo. Ingasetyenziselwa ukuvelisa umgangatho ophezulu wentsimbi, intsimbi kunye ne-alloy.