I-coke kaphethiloli ene-graphitized graphitized eyenziwe nge-coke kaphethiloli esezingeni eliphezulu ngaphansi kwezinga lokushisa elingu-2,500-3,500℃. Njengezinto zekhabhoni ezihlanzekile kakhulu, inezici zokuqukethwe kwekhabhoni okuqinile okuphezulu, isibabule esiphansi, umlotha ophansi, ukugeleza okuphansi njll. Ingasetshenziswa njenge-carbon raiser (Recarburizer) ukukhiqiza insimbi esezingeni eliphezulu, insimbi ephothiwe kanye ne-alloy. Ingasetshenziswa futhi epulasitikini kanye nerabha njengesithasiselo.