Bakin karfe bisa ga amfani da hanyoyin sarrafawa ya kasu kashi: karfe sarrafa karfe da yankan karfe; Dangane da halaye na nama, ana iya raba shi zuwa nau'ikan iri biyar: nau'in austenitic, nau'in austenite-ferritic, nau'in ferritic, nau'in martensitic da nau'in hazo-hardening.