Graphite Petroleum Coke (GPC), a matsayin mai haɓaka carbon, muhimmin sashi ne a cikin masana'antar yin ƙarfe.Ana amfani da shi da farko azaman ƙarar carbon yayin samar da ƙarfe don haɓaka abun cikin carbon, rage ƙazanta, da haɓaka ingancin ƙarfe gabaɗaya.