Ductile Iron Castings

Since ductile iron was developed in the 1940s, this remarkable metal has proved its value in tens of thousands of engineering and casting applications. Ductile iron is created by an alloying process, which converts the crack-promoting graphite flakes of gray iron into nodules. With this micro-structural transformation, the metal acquires superior ductility, elongation characteristics and machinability. The ductile iron family offers the design engineer a unique combination of strength, wear and fatigue resistance and toughness as well as excellent ductility characteristics. In all its grades, ductile iron exhibits mechanical properties that make it an ideal alloy for investment casting. Tiny amounts of magnesium or cerium are added to these alloys to slow down the growth of graphite precipitates by bonding them to the edges of the graphite planes. Along with careful control of other elements and timings, the carbon separates into spheroidal particles as the material solidifies. Its properties are similar to malleable iron but parts of it can be cast with larger sections.

Ductile Iron Castings

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