Malleable iron is a nodular iron very similar in structure to some grades of Ductile iron. Often considered to be an “old” or obsolete iron, malleable iron is still made around the world.
Malleable iron, like Ductile iron exhibits excellent elongation properties. In other words, it can be bent and is also easily machinable like mild steel.
Malleable iron is typically used for small castings requiring good tensile strength and the ability to flex without breaking (ductility). Electrical fittings, hand tools, pipe fittings, washers, brackets, fence fittings, power line hardware, farm equipment,mining hardware, machine parts, are all typical applications.
From a manufacturing point of view, malleable iron gets its nodularity from a heat treating process known as “annealling”. Whereas Ductile iron gets its nodularity from a magnesium inoculation process.
Malleable iron is a superior choice where castings will be used in a cold environment as it retains its ductility at much lower temperatures than Ductile iron.
Malleable iron can also be cast in much thinner sections than Ductile iron. Sections as thin as .125″ (1/8″) are possible.
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.