How To: Identify hardened steel compared to mild steel

Identify hardened steel compared to mild steel

Hardened steel is very durable, but nearly impossible to work with at home. If you are trying to choose a piece of steel and can't tell if it's hardened or not, you're in luck, because this video contains a quick method for doing so. All you do is try to file an indentation in the steel with a file. If that doesn't make a mark, you've probably got hardened steel.

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