Tun da calcium yana da alaƙa mai ƙarfi tare da oxygen, sulfur, hydrogen, nitrogen da carbon a cikin narkakkar karfe, silicon-calcium alloys ana amfani da su don deoxidation, degassing da gyaran sulfur a cikin narkakken karfe.Calcium silicon yana samar da tasirin exothermic mai ƙarfi lokacin da aka ƙara shi zuwa narkakken ƙarfe.Calcium ya zama tururi na calcium a cikin narkakkar karfe, wanda ke da tasiri a kan narkakkar karfe kuma yana da amfani ga shawagi na abubuwan da ba na ƙarfe ba.