Gray iron investment castings ndiyo zvigadzirwa zvekukanda zvakadirwa newakisi yakarasika yekukandira muitiro panzvimbo yesimbi inowanikwa. Grey iron (kana grey cast iron) imhando ye iron-carbon alloy (kana Ferrum-Carbon Alloy) ine graphite microstructure. Inotumidzwa zita regrey ruvara rwekutsemuka kwainoumba. 
