Injongo: I-Graphite petroleum coke I-GPC yenziwe nge-petroleum coke ekumgangatho ophezulu. Luhlobo lwe-carburizing agent ekumgangatho ophezulu, ene-carbon ezinzileyo ephezulu, i-sulfur ephantsi, uthuthu oluphantsi, izinga eliphezulu lokufunxwa kunye nezinye izibonelelo. Ingasetyenziselwa ukuvelisa intsimbi ekumgangatho ophezulu, isinyithi esityhidiweyo kunye ne-alloy.