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What is 4140 mild steel?

Updated: 8/11/2023
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15y ago

Best Answer

I think you're looking at two separate terms.

SAE 4140 steel is a Chromium-Molybdenum steel used extensively for axles, aerospace concerns, and firearm manufacture.

Mild steel is a catch-all term for plain carbon steel of low carbon content (such as SAE 1018) which is generally cheap, not heat-treatable, and used for fairly low-strain applications.

I hope that helps.

Mike

Source - Machinery's Handbook, 11th Edition, 1943

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15y ago
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