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Cast Iron

A reliable source for Cast Iron information and leading Cast Iron 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

Terre Haute, IN  |  800-467-6252

Modern Aluminum Castings Co., Inc. has been a designer and manufacturer of aluminum and iron castings since 1919. Industries served include the sporting goods, medical devices, industrial machinery, HVAC, automotive, electrical lighting, appliance, and construction industries. Other services include forgings, stampings, custom machined components, and others.

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Modern Aluminum Castings Co., Inc. $$$

Webster, SD  |  605-345-3349

Since 1977, Dakota Foundry has been a leader in the grey iron castings industry. Our expert team of leaders all have 25-30 years of experience and are ready to use their knowledge to help customers with their needs. Customers of Dakota Foundry can expect high-quality products and excellent service.

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Dakota Foundry $$$

Richmond, VA  |  804-233-9674

OK Foundry offers highly flexible gray and ductile iron castings. Family owned since 1912, we ensure tightly controlled metallurgy for production, prototype & one-of-a-kind engineering & architectural castings up to 700 lbs. Whether you need a handful of castings or regular shipments of large quantities, we offer shorter lead times & cheaper tooling. Your domestic partner for gray or ductile iron parts.

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O.K. Foundry Company, Inc. $$$

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. $$$

Hanover, PA  |  717-632-4165

As a leading manufacturer of grey and ductile iron castings, Penn-Mar Castings has lead times as low as three weeks and the ability to pour castings ranging from 150 to 3,000 pounds. Our foundry uses a no-bake method to produce both complex cores as well as simple shapes. By determining the lowest scrap rate and reducing machining time, we offer long-term savings without compromising quality.

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Penn-Mar Castings, Inc. $$$

Maumee, OH  |  844-722-7846

For over 60 years, Carson Castings has been a leading manufacturer of grey iron castings. Through the years, we have built many relationships with our customers because they know we are reliable and responsive while creating high-quality products. Contact us today or visit our website for more information!

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Carson Castings $$$
placeholder image Modern Aluminum Castings Co., Inc. Dakota Foundry O.K. Foundry Company, Inc. Impro Industries USA, Inc. Penn-Mar Castings, Inc. Carson Castings

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.

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