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Cast irons are a large group of ferrous alloys which solidify with a eutectic. They contain high amounts of iron, significant amounts of silicon (about 1-3%), and are considered to be ternary alloys (Fe-C-Si). Cast irons tend to be brittle depending on the particular alloy. They generally have low melting points, good fluidity, castability, wear resistance, and excellent mechanicability. Because of these benefits, cast irons are being included in an increasing number of engineering applications, including pipes, machines, and car parts. Cast irons are available in two colors: gray and white.

Gray cast irons contain a significant amount of silicon. When this silicon is alloyed with ferrite and carbon (approximately 2% of each), the iron carbide becomes unstable. The silicon causes the carbon to quickly pull out of the solution, resulting in graphite. Once the carbon is extracted, the solution becomes a matrix of relatively pure, soft iron. Weak bonding occurs between the plates of graphite and leads to high-energy growth in that direction. As a result of that growth, thin flakes are formed. The benefit of working with graphite is that it can improve wear resistance due to its high thermal conductivity. When compared to steel, however, gray cast irons have less strength and shock resistance. 

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Engineering Web: Cast Irons
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Industrial Materials & Chemicals > Metals Alloys > Ferrous Metals Alloys > Cast Irons · Cast Irons · Carbon Steels Alloy · Tool Steels
Cast irons
Cast irons Printable Version Abstract: In this paper is presentation flake graphite iron.
Cast Irons - a reference guide from Manufacturingtalk
"Cast Irons"... Mike Page, Editor, writes:
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Part Numbers for Cast Irons
Part # Distributor Manufacturer Product Category Description
Y517-A775 Automationdirect.com Not Provided AC Motors Class H MAX GUARD® insulation system, cast iron frame and brackets
680F Newark Thomas & Betts All Supplier Direct Ship 2""O CAST CVR, GRAY IRON, FORM 8
781711209844 PLC Radwell Boston Not Provided CAST IRON HOUSING
781711241646 PLC Radwell Boston Not Provided CAST IRON FLANGES
Y516-A775 Automationdirect.com Not Provided AC Motors Class H MAX GUARD® insulation system, cast iron frame and brackets

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