Nodular cast iron simbi mapaipi akanyanya ductile iron mapaipi, ayo ane musimboti wesimbi uye zvimiro zvesimbi, nekudaro zita rawo. Graphite mu ductile iron mapaipi iripo mune yakatenderera fomu, ine hukuru hwese hwemagiredhi 6-7. Panyaya yemhando, iyo spheroidization level ye cast iron pombi inodiwa kuti idzorerwe pa 1-3 mazinga, ine spheroidization rate ye ≥ 80%. Nokudaro, iyo mechanical properties yezvinyorwa pachayo yakagadziridzwa, iine essence yesimbi uye zvinhu zvesimbi. Mushure mekuvhara, iyo microstructure ye ductile iron mapaipi ndeye ferrite ine shoma shoma ye pearlite, iyo ine yakanaka yemagetsi maitiro, saka inonziwo cast iron iron pipes.