Semi GPC (SGPC) yog los ntawm txheej rwb thaiv tsev ntawm acheson cub tawg. Qhov kub ntawm graphitization yog nyob rau hauv qhov ntauntawm 1700-2500ºC. Nws yog rau cov khoom lag luam graphitization kub nruab nrab. Nws yog recarburizer pheej yig nrogcov pa roj carbon ruaj khov siab, cov ntsiab lus sulfur qis dua, qhov nrawm yaj sai thiab qhov nrawm nqus siab.