Baƙar bututun ƙarfe an yi shi da ƙarfe wanda ba a sanya shi ba.Sunan ta ya fito ne daga lallausan baƙin ƙarfe oxide mai launin duhu a samansa.Ana amfani da shi a aikace-aikacen da ba sa buƙatar ƙarfe mai galvanized.

Baƙar fata bututu (bututun ƙarfe mara rufi) ana kiransa "baƙar fata" saboda ma'aunin ƙarfe-oxide mai launin duhu da aka samu akan samansa;yawanci ana amfani dashi don ƙananan bututun dumama ruwan zafi.Yana samuwa a cikin jadawalai biyu (jadawalai 40 da jadawalin 80).Bambanci tsakanin jadawalin guda biyu shine bangon bango na bututu.Jadawalin 80 baƙar fata bututu yana da kauri fiye da jadawalin 40. A yawancin hukunce-hukuncen jadawali ana buƙatar 80 don layin condensate saboda acid da ƙazanta.Zan ba da shawarar sosai fiye da jadawalin 40.

Lokacin da aka ƙirƙira bututun ƙarfe, ma'aunin baƙin ƙarfe oxide yana buɗewa a samansa don ba shi ƙare wanda aka gani akan wannan nau'in bututu.Saboda karafa yana fuskantar tsatsa da lalata, masana'antar kuma tana sanya shi da mai.Ana amfani da waɗannan baƙin ƙarfe don kera bututu da bututu, wanda ba zai yi tsatsa na dogon lokaci ba kuma yana buƙatar kulawa kaɗan.Ana sayar da shi a daidaitaccen tsayin ƙafa 21 TBE.Ana amfani da shi sosai don amfanin yau da kullun a cikin ruwa, iskar gas, iska da tururi, ana amfani da bututun ƙarfe na ƙarfe da bututu don rarraba iskar gas a ciki da wajen gida da kuma wurare dabam dabam na ruwa a cikin tsarin tukunyar jirgi.Hakanan ana amfani da shi don bututun layi a cikin masana'antar mai da mai, don rijiyoyin ruwa da abubuwan ruwa, iskar gas da najasa.