Inhloso: I-Graphite petroleum coke I-GPC yenziwe nge-petroleum coke esezingeni eliphezulu. Iwuhlobo lwe-carburizing agent esezingeni eliphezulu, ene-carbon engaguquki ephezulu, i-sulfur ephansi, umlotha ophansi, izinga lokumuncwa eliphezulu kanye nezinye izinzuzo. Ingasetshenziswa ukukhiqiza insimbi esezingeni eliphezulu, insimbi ephonswe kanye ne-alloy.