Silicon karfe ƙunshi 1.0-4.5% silicon da silicon gami karfe tare da carbon abun ciki na kasa da 0.08% ake kira silicon karfe.
Yana da halaye na babban ƙarfin maganadisu, ƙarancin ƙarfin ƙarfi, da babban juriya, don haka asarar hysteresis da asarar halin yanzu kaɗan ne.
Ana amfani da shi azaman kayan maganadisu a cikin injina, masu canza wuta, kayan lantarki da kayan lantarki.