Cast Iron

A reliable source for Grey Iron Castings information and leading Grey Iron Castings Companies & Manufacturers.

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. Read More…

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.

Leading Manufacturers

Homer, MI  |  517-568-4415

We distinguish ourselves by providing outstanding cast iron products. We gear our manufacturing procedures to save our customers time and money. The attributes of our cast iron are support by our ISO certification and we promise to deliver you the highest quality cast iron possible. All of our products are 100% tested for durability and accuracy.

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Calhoun Foundry Corporation $$$

Webster City, IA  |  515-832-1722

Seneca Foundry is a manufacturer of gray and ductile iron castings, ranging in size from ounces to 250 pounds. Our customer base is from a wide range of industries, such as agriculture, industrial, cookware and more. We offer a variety of molding processes including green sand, lost foam, and no-bake. Our versatility enables us to give the customer the best solution for their casting needs. Contact us today to get started!

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Seneca Foundry, Inc. $$$

Benton, PA  |  570-925-6711

For nearly a century, Benton Foundry has been supplying iron castings to a variety of industries, building a reputation for consistent, high-quality castings delivered on time. Working with all types of gray iron and ductile iron, Benton provides quality components and extraordinary service at a low net cost. Put Benton’s near 100 year history to work for your most challenging casting application.

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Benton Foundry, Inc. $$$

Ashland, PA  |  570-875-6100

Ashland Foundry & Machine Works LLC (AFMW) is a world class manufacturer of grey iron castings. We have the ability to produce castings from a few pounds to 10,000 lbs in steel and 17,000 lbs in iron grades. We utilize 7 coreless induction furnaces ranging in size from 500 lbs. to 7,500 lbs. In addition to machining, we offer hydro testing, impeller balancing and polishing. We are ISO 9001:2015 certified.

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Ashland Foundry and Machine Works $$$

Jackson, MI  |  517-782-9469

Pioneer Foundry specializes in the manufacture of high quality, low volume gray iron castings. We can handle a very wide variety of designs., uilizing wood, poly, or composite patterns and air-set sand molds. Our rigid processes and top quality raw materials are proven to produce castings that are built to last. We deliver stress relieved, blasted, prime-painted or raw castings that are ready for machining. Contact us today to learn more about our capabilities.

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Pioneer Foundry $$$
placeholder image Calhoun Foundry Corporation Seneca Foundry, Inc. Benton Foundry, Inc. Ashland Foundry and Machine Works Pioneer Foundry

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.

Cast Iron Informational Video