Ningxia high quality-anthracite (na musamman low ash, low sulfur, low phosphorus, high gyarawa carbon, high calorific darajar) an calcined a 1200 ℃, tare da karfi hadawan abu da iskar shaka juriya, high inji ƙarfi, high sinadaran aiki, high tsabta ci dawo kudi da sauran halaye. An fi amfani da shi don haɓaka carbon a aikin ƙarfe. Ayyukansa shine haɓaka zafin jiki da sauri, tare da tasiri mai kyau da ƙimar ɗaukar carbon. Ana iya amfani da shi don daidaita abubuwan da ke cikin carbon da abun da ke cikin iskar oxygen na narkakkar karfe, canza tsattsauran ra'ayi da taurinsa, don haka inganta ikon haɓakar ƙarfe na narkakkar da ingancin ciki na billet.
