Graphite petroleum coke (GPC), raws li cov pa roj carbon monoxide, yog qhov tseem ceeb hauv kev lag luam steel.Nws feem ntau yog siv los ua cov pa roj carbon ntxiv thaum lub sij hawm tsim cov hlau kom nce cov ntsiab lus carbon, txo cov impurities, thiab txhim kho tag nrho cov hlau zoo.