I-graphite petroleum coke isetshenziswa kabanzi ezinqubweni ezikhethekile zokubumba njenge-recarburiser, ikakhulukazi ekukhiqizeni imikhiqizo ye-ductile ne-grey cast iron esezingeni eliphezulu enokuqukethwe kwe-sulfur okulawulwa kahle, kanye nakwezinye izinhlelo zokusebenza.