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Cast Iron

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

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.
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Leading Manufacturers

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. $$$

Syracuse , NY  |  315-468-6251

Our name may be familiar to you from our ductile iron castings or malleable iron castings—underground mine roof expansion anchors plus items for utility, tool, natural gas, electrical, construction, automotive industry applications. Our molding machines and pouring units make 400,000 castings a day.

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Frazer & Jones Company $$$

Warsaw, IN  |  574-267-8111

Dalton Corporation’s 100 years of foundry engineering experience acts as an extension of your engineering department to optimize cost and weight through in-house prototyping and the latest simulation software. Our facility can accommodate small to large run requirements on a range of special alloy capabilities. We at Dalton strive to be the easiest foundry to do business with through versatility and flexibility in scheduling, delivery and processing.

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Dalton Corporation $$$

Diamond Bar, CA  |  877-484-6776

Impro Industries is globally recognized as a leading provider of high-precision, high-complexity, and mission-critical casting and machined components. Industries served include automotive, aerospace, medical, and many mor. Our team is dedicated to the quality of our every project, ensuring the highest customer satisfaction. Contact us today to learn more about our grey iron casting capabilities.

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Impro Industries USA, Inc. $$$

Roscoe, IL  |  815-389-3921

For over 45 years, State Line Foundries has been providing customers premium precision castings. Utilizing our seasoned professionals and state of the art technology, we fabricate grey iron and ductile iron castings in low to medium production volumes. We also offer heat treating, painting, plating, machining, as well as other value added services. At State Line Foundries, we pride ourselves on our quality and have been ISO 9001 registered for many years.

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State Line Foundries $$$

Greenville, OH  |  937-669-5620

Since 1923, Calmego Casting Corporation has been providing top of the line Grey Iron, Bronze, Brass and aluminum casting. We work hard to provide our customers with excellent products and superior customer service. Call us today for more information on our products and services or explore our website.

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Calmego $$$
placeholder image Seneca Foundry, Inc. Frazer & Jones Company Dalton Corporation Impro Industries USA, Inc. State Line Foundries Calmego

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