Iron Castings

Iron Castings

One type of iron used in iron casting is gray iron, which has been cast by foundries for centuries, making it possibly the oldest of all worked metals. It is also the most abundant metal material and one of the least expensive. Gray iron was the original cast iron, although it has recently been replaced in many applications by other iron-carbon alloys with stronger tensile strength. Ductile iron, as its name suggests, is more ductile than traditional iron materials, like gray iron. These materials tend to be brittle and prone to fracture under high tensile stress. Iron is cast much like any other metal; it is poured into a mold and extracted after it cools. There are several different casting methods through which iron is molded, including green sand molding, shell molding, and centrifugal molding. The method by which the iron is cast can have an effect on the mechanical properties of the metal, especially in respect to its cooling rate.