Ƙarfin Ƙarfin Ƙarfe yana nufin simintin ƙarfe wanda graphite a cikinsa yake da siffar zobe bayan narkakkar ƙarfen da aka yi masa magani tare da spheroidizing wakili. Shi ya sa ana kuma kiran ƙarfen simintin simintin gyare-gyare na spheroidal graphite cast iron ko nodular cast iron. A cikin simintin gyare-gyaren ƙarfe ta hanyar microsope na lantarki, siffar graphite spheroidal kusan mai siffa ce, kuma cikinsa siffar radial ce, kuma tana da tasirin polarization a fili. Matsakaicin spheroidization yana nufin adadin jimlar jimlar graphite mai siffar zobe a cikin wani kewayon zuwa jimlar adadin graphite. Matsakaicin spheroidization maƙasudi ne don auna ƙimar spheroidization na simintin ƙarfe na nodular, kuma yana da ma'auni mai mahimmanci a cikin simintin simintin ƙarfe na ductile.
