Ductile cast iron is also known as nodular or spheroidal-graphite cast iron. It consists of relative high strength and toughness of ductile iron, which gives an advantage over either a gray iron or malleable iron in many structural applications. It is used for automotive parts such as crankshafts, front wheel spindle supports, disk brake calipers, engine connecting rods, idler arms, wheel hubs, truck axles, suspension system parts, power transmission yokes. It contains high temperature application for turbo housings and manifolds and high security valves for many applications. They are tempered to high tensile strength, high fatigue strength, high toughness, and excellent water resistance.