... are of the anti-corruption function. Used in undermine, electrical transmission net parts etc.) All these parts can be ... and the parts.1) Sand casting parts material: Gray iron, ductile iron, malleable iron, aluminum, bronze, zinc brass. Prisission casting parts: ... steel. Bronze.Forged: friction forged, presision forged, die forged.Gey iron casting: FC20, FC25, FC30, FC35.Ductile casting: FCD40, FCD45 ...