GRAY IRON

What is Gray Iron?

Gray iron is by far the oldest and most common form of cast iron. As a result, it is assumed by many to be the only form of cast iron and the terms "cast iron" and "gray iron" are used interchangeably. Gray iron, named because its fracture has a gray appearance, consists of flake graphite in a matrix consisting of ferrite, pearlite or a mixture of the two. The fluidity of liquid gray iron, and its expansion during solidification due to the formation of graphite, have made this metal ideal for the economical production of castings in a variety of industries. Many engineers design castings using gray iron due to its excellent machinability, dampening characteristics and self-lubricating properties.

Gray Iron Production Capabilities

Metal Technologies currently has the capacity to produce 177,000 tons of gray iron castings each year. Our casting sizes range from 1 lb. to 80 lbs. We produce several gray iron classes ranging from G2500 to G4000 as well as other grades including damped gray iron and customer specific grades.

Gray Iron Class Production by Foundry