Ƙarfe na Calcium ko ƙarfe na ƙarfe ƙarfe ne na azurfa da fari.An yafi amfani da matsayin deoxidizing, decarburizing, da desulfurizing wakili a gami karfe da musamman karfe samar.Hakanan ana amfani da shi azaman wakili mai ragewa a cikin matakai masu ƙarancin ƙarfi na ƙasa mai ƙarfi.
Calcium ƙarfe ne mai launin azurfa-farin, ya fi ƙarfi da nauyi fiye da lithium, sodium, da potassium;yana narke a 815 ° C.Abubuwan sinadaran ƙarfe na alli suna aiki sosai.A cikin iska, alli zai zama oxidized da sauri, yana rufe fim ɗin oxide.Lokacin da zafi, alli yana ƙonewa, yana fitar da kyakkyawan haske mai launin tubali.Ayyukan Calcium da ruwan sanyi yana sannu a hankali, kuma halayen sunadarai masu tayar da hankali zasu faru a cikin ruwan zafi, sakin hydrogen (lithium, sodium, da potassium za su fuskanci mummunan halayen haɗari ko da a cikin ruwan sanyi).Calcium kuma yana da sauƙin haɗawa da halogen, sulfur, nitrogen da sauransu.