Ductile iron, like Malleable iron exhibits excellent elongation properties. In other words, it can be bent and is also easily machinable like mild steel.
Ductile iron is a nodular iron very similar in structure to Malleable iron. Most of the nodular cast today is Ductile iron.
Ductile iron is typically used for medium to large castings requiring high tensile strength and the ability to flex without breaking (ductility). Brake rotors, machine parts, power line hardware, construction components, farm machinery, railroad components are all typical applications.
Ductile iron gets its nodularity from a magnesium inoculation process, and generally does not require a secondary heat treating step. However, in some cases, especially in thin section castings, a secondary “annealling” heat treatment is required. The Bowmanville Foundry is one of the only ductile iron foundries in North America with this capability.
Ductile iron is available in several grades with tensile strengths ranging from 60,000 psi to 80,000 psi. However, as the tensile strength increases, elongation (ductility) reduces.
The Bowmanville Foundry has extensive experience in producing Malleable Iron, Ductile Iron, Austempered Ductile Iron (ADI), Gray Iron, and Wear Resistant Irons, and can recommend the appropriate material for your application.