Coke ya petroleum yokhala ndi graphitized yoyera kwambiri imapangidwa kuchokera ku coke ya petroleum yapamwamba kwambiri pa kutentha kwa 2,500-3,500℃. Monga chinthu cha carbon choyera kwambiri, ili ndi mawonekedwe a carbon yokhazikika kwambiri, sulfure yochepa, phulusa lochepa, porosity yochepa ndi zina zotero. Ingagwiritsidwe ntchito ngati chokweza carbon (Recarburizer) kuti ipange chitsulo chapamwamba kwambiri, chitsulo chopangidwa ndi alloy ndi alloy. Ingagwiritsidwenso ntchito mu pulasitiki ndi rabara ngati zowonjezera.
