Carburizer, kuma aka sani da carburizing agent ko carburant, ƙari ne a cikin ƙera ƙarfe ko simintin ƙarfe don ƙara abun cikin carbon.Ana amfani da Carburizers don tace Carburizers na ƙarfe da simintin ƙarfe Carburizers, da sauran abubuwan da ake ƙarawa ga Carburizers, kamar abubuwan da ake ƙara birki, azaman kayan juzu'i.