| Iron casting is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape, containing 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus. Ductile iron casting is a type of iron casting invented by Keith D. Millis in 1942. The typical chemical analysis of ductile iron casting contain, Carbon 3.3 to 3.8%, Silicon 2.2 to 2.8%, Manganese 0.1 to 0.5%, Sulfur 0.005 to 0.02%, Phosphorus 0.005 to 0.04%, Magnesium 0.03 to 0.05%, balance (i.e., 100% minus the above elements) is the element iron. The unique characteristic of ductile iron casting is that the graphite forms into a spherical shape. Sometimes this is referred to as a "nodular" shape. Ductile iron casting may also be called "nodular iron". Ductile iron castings are used in numerous applicationssuch as automobile construction, industrial machinery, wind turbine electrical energy generation, valves, air conditioning machinery, lawn & garden equipment, agricultural products and many other types of castings. ( sources: Wikipedia )
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