Carbon karfe bututu ne na karfe da aka samar daga carbon karfe, wanda aka yi da karfe ingot ko m zagaye karfe ta perforation, sa'an nan kuma sanya ta da zafi birgima, sanyi birgima ko sanyi zane. Abubuwan da ke cikin carbon kusan 0.05% zuwa 1.35%. An rarraba bututun ƙarfe na carbon zuwa: bututun ƙarfe maras kyau don amfani da tsari, bututun ƙarfe don isar da ruwa, bututun ƙarfe mara nauyi don ƙananan matsa lamba da matsakaitan tukunyar jirgi, bututun ƙarfe don babban matsa lamba, bututun ƙarfe don fashewar mai.