I-petroleum coke enegrafiti ephezulu yenziwe nge-petroleum coke esemgangathweni ophezulu phantsi kobushushu obuyi-2,500-3,500℃. Njengezinto zekhabhoni ezicocekileyo kakhulu, ineempawu zomxholo wekhabhoni ozinzileyo ophezulu, isalfure ephantsi, uthuthu oluphantsi, i-porosity ephantsi njl. Ingasetyenziswa njenge-carbon raiser (Recarburizer) ukuvelisa intsimbi ekumgangatho ophezulu, isinyithi esityhidiweyo kunye ne-alloy. Ingasetyenziswa nakwiplastiki kunye nerabha njengesongezelelo.