Ductile iron pipe

Ductile iron pipe is made from cast iron in which graphite is predominantly spheroidal or nodular. That microstructure distinguishes it from flake-graphite gray cast iron and provides more ductile and tougher behavior, while the product remains a cast-iron piping system rather than steel pipe. Joint arrangements, thickness or pressure classes, linings, and external protection vary across systems. Selection should address the conveyed medium, design pressure, soil and external corrosion conditions, thrust restraint, joint type, lining, and installation method for the specific project.