ASTM A 48 castings are castings that are intended for general use when tensile strength is a key consideration.
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Also called grey cast iron, gray iron is a kind of cast iron with a graphitic microstructure. It has high thermal conductivity, good machinability and excellent damping capacity. Unfortunately, because of its low ductility and tensile strength, it has very little impact and shock resistance. It does, however, have good corrosion resistance because of its silicon content, which can occupy up to 6 to 10% of the content of gray iron. Because of its low cost of production and attractive properties, gray iron is one of the most commonly used ferrous alloys.
Pro Tip: That being said, there are a number of instances where ductile iron would be preferred for a given application. To learn more, read &#;The Differences Between Ductile Iron and Gray Iron.&#;
We pour several grades of gray iron including:
Note: For castings that experience temperatures up to F consider using ASTM A319 Heat Resistant Gray Iron.
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Possible Applications for Gray Iron
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Gray iron is the most common type of iron, also we can call it ordinary cast iron. This material has a raspy gray cross-section, and its internal carbon is present in the form of flaky graphite.
Gray iron usually formes during the melting process due to the slow cooling rate. However, it is mainly due to a large number of silicon elements prompting the graphitization of carbon. Therefore, the silicon content in gray iron is high, generally requiring up to 1%-3.5%. Gray iron is an inoculated iron (also called metamorphic iron) obtained by inoculation-treatment of ordinary iron with higher strength. The carbon content of gray iron is more than 4.3%, and most or all of the carbon element in this iron exists as free state flake graphite.
Gray iron is one of the most widely used iron. It has excellent castability, machinability, wear resistance, and vibration damping. The compressive strength and hardness of this iron are close to carbon steel, but the tensile strength and plasticity are low and brittle.
The production process of gray iron is inexpensive and straightforward. And this kind of iron usually applies in many mechanical engineering applications, mainly for wear-resistant components under medium loads.
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