What's the difference between Chromoly, 4130 Chromoly, and Heat Treated Chromoly... if there is one?
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Munyi89
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AISI 4130 steel is a specific low-alloy steel that contains small amounts of chromium and molybdenum. There are many chromium / molybdenum alloys used in industry, all with slightly different properties. Steel alloys can be heat-treated to modify their properties for specific needs (e.g., hardness, tensile strength, workability). Each alloy has different properties, depending on the method of heat treating used during production and its chemical composition. The constituents of AISI 4130 steel are: - 0.28 to 0.33% carbon. - 0.40 to 0.60% manganese. - 0.04% phosphorus (max). - 0.04% sulphur (max). - 0.20 to 0.35% silicon. - 0.80 to 1.10% chromium. - 0.15 to 0.25% molybdenum. - Balance: iron. AISI 4140 steel, also a chromium / molybdenum alloy, contains: - 0.38 to 0.43% carbon. - 0.75 to 1.0% manganese. - 0.04% phosphorus (max). - 0.04% sulphur (max). - 0.20 to 0.35% silicon. - 0.80 to 1.10% chromium. - 0.15 to 0.25% molybdenum. - Balance: iron. AISI is the American Iron and Steel Institute (http://www.steel.org/). Materials data from "Metallurgy and Plastics for Engineers", M.C. Nutt.
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