Icukurwa rya peteroli rya Graphitized Petroleum Coke (GPC) ni igikoresho cy'ingenzi mu nganda z'ibyuma, gikoreshwa cyane nk'igikoresho cyo kongera karuboni (recarburizer) mu gukora ibyuma no gusuka. Ikorwa binyuze mu gukoresha graphitization y'ubushyuhe bwinshi bwa peteroli coke kuri 2,500-3,500°C, irangwa n'umubare munini wa karuboni udahinduka, sulfur nkeya, n'urugero ruto rw'umwanda. GPC izwiho umuvuduko wayo wo kwinjiza ibintu byinshi, imikorere yayo ihamye, n'ubushobozi bwayo mu kugabanya ibintu byangiza nk'sulfur na azote mu cyuma gishongeshejwe. Ibi bituma iba ibikoresho byiza byo gukora ibyuma byiza, ibyuma bishongeshejwe, n'ibindi.
