Ferro-Carbon Ball Don Bof
Za a ƙara ƙwallan ferro-carbon a cikin mai canzawa bayan an gama ɗora tarkace kuma kafin fara busa. Jimlar adadin da aka ƙara a cikin bunch ba zai zama ƙasa da 15kg/ton ba, 2-3kg/ton kowane lokaci bisa ga yanayin zafi da narkewar slag.