Grey Iron Castings/

Cast Iron

Cast iron encompasses a large group of ferrous alloys containing between 1 and 3 % silicone and 2 to 4% carbon with a core of about 95% iron by weight.While there are several specific casting techniques in use to produce cast iron parts, all follow this basic procedure of heating, molding, cooling and ejecting.

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Modern Aluminum Castings Co., Inc.
Terre Haute, IN
812-232-0007
For over 90 years Modern Aluminum Castings co., Inc. as provided quality cast iron to a plethora of industries. Our highly automated production capabilities achieve precision parts, lower costs and on time delivery. We've worked closely with numerous customers on inventory management and product stocking programs. Visit our website for more information on our products and services.
Imperial Casting Company, Inc.
Florence, AL
256-766-8720
Imperial is a 40 year old company proud to produce quality cast iron solutions for American Industry. Imperial specializes in many quality components, from 8 oz to 400 lbs, and employs experienced and talented professionals dedicated to their customers' satisfaction. Imperial serves a wide range of industries with top-quality, cost-effective solutions. Call Imperial today!
Atlas Foundry Company Inc.
Marion, IN
765-662-2525
Atlas is a full service cast iron manufacturer that provides part evaluation and design assistance, prototypes, tooling development, pattern maintenance, raw parts, finishing (grinding, shot blasting, tumbling) and required secondary services. Major industry groups served include agriculture, construction, transportation and manufacturing. Please call now.
Specialty Castings, Inc.
Springport, MI
888-812-9543
Specialty provides a wide range of cast iron components weighing between 1/4 pound & 250 lbs. and proudly serves the automotive, government, diesel, mining, power transmission, process machinery, agriculture, fluid handling & machine tool industries. Based on its ISO 9001:2000 certification & its demanding quality assurance procedures, Specialty focuses on meeting & delivering your exact needs.
General Foundry, LLC
Bethlehem, PA
877-222-4766
General Foundry provides high quality cast iron components nationwide to a variety of industries. With a fully automated no-bake molding loop, state-of-the art systems, including a complete pattern shop for new wood & plastic patterns, alterations, gating, rigging & repairs, General has the capabilities to deliver to you the precision solutions you are looking for. Call General today.
Willman Industries, Inc.
Cedar Grove, WI
920-668-8526
Willman stands for quality cast iron parts that you can count on for many years to come. As a leading manufacturer producing all types of precision components, weighing from ounces to 40,000 lbs, Willman can satisfy your demands for complex engineering solutions. Willman employs skilled workers & the most advanced equipment for economical production, giving you the quality assurance you want.

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Industry Information

Cast Iron

There are two predominant types of cast iron, those being grey iron and white iron. The former has a graphitic structure, the deflection of which provides the namesake color on fracture surfaces. White iron, however, has small white deposits of cementite rather than being completely pallid. The main differences between the two are silicone content and cooling times, both of which have a significant impact on the physical and mechanical behavior of the alloy. White iron has a low carbon content and is cooled at a fast rate to produce a brittle cast part with good hardness and abrasion resistance. These are used in a number of wear applications such as slurry pumps, liners, grinding mills and pulverizers. Grey iron castings on the other hand are produced through the slow cooling of high carbon iron alloys and are less brittle allowing their use as crankshafts, support beams, engine blocks and more. In addition to these two types, iron foundries and metallurgical engineers continue to develop more malleable and ductile irons that exhibit the beneficial characteristics of cast iron, but with significant reductions to brittleness due to a spheroid rather than flaked internal structure. These specialized alloys are becoming increasingly common in the industrial world.

Although pure iron is found only in meteorites, the element is one of the most abundant on Earth making up 5% of the crust and 35% of the total mass. Mining operations extract the element from iron ore and oxides such as magnetite, hematite, limonite, goethite and siderite which contain high levels of iron. These oxides are smelted to produce what is known as pig iron, the base material for cast iron. The stock forms are heated in a special blast furnace known as a cupola. Scrap iron and steel are added to the molten mixture to produce cast iron. Once in a molten state this metal is poured into a cast where it is cooled at controlled rates before a finished or near finished part is ejected or extracted. Some of the more popular methods used today for iron castings are die casting, centrifugal casting and sand casting. Die casting is used to manufacture complex parts at high production rates, centrifugal casting creates cylindrical parts and sand casting uses expendable synthetic or natural sand molds to create rough parts. These processes result in easily machined cast iron components with high compression strength, low melting points, good thermal conductivity and energy dissipation, wear resistance and fluidity.