Ƙarfin ƙarfe ba abu ɗaya ba ne amma yana cikin rukuni na kayan da za a iya samar da su don samun nau'o'in kaddarorin ta hanyar sarrafa microstructure. Halayen ma'anar gama gari na wannan rukuni na kayan shine siffar graphite. A cikin baƙin ƙarfe ductile, graphite yana cikin nau'i na nodules maimakon flakes kamar yadda yake a cikin baƙin ƙarfe. Siffa mai kaifi na flakes na graphite yana haifar da maƙasudin maida hankali a cikin matrix na ƙarfe da siffar zagaye na nodules ƙasa da haka, don haka hana ƙirƙirar fashe da samar da ingantaccen ductility wanda ke ba da gami da sunansa. Ana samun samuwar nodules ta hanyar ƙara abubuwan nodulizing, yawanci magnesium (bayanin kula da magnesium yana tafasa a 1100 ° C kuma baƙin ƙarfe yana narkewa a 1500 ° C) kuma, ƙasa da yawa yanzu, cerium (yawanci a cikin nau'in Mischmetal). An kuma yi amfani da Tellurium. Yttrium, sau da yawa wani sashi na Misch karfe, an kuma yi nazari a matsayin mai yiwuwa nodulizer.
