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  • grain structure only alters if you quench, leave to cool naturally and structure stays the same. and to harden you heat to cherry and quench a few times sorted. gonna nitride it aswell.

    Make sure you temper afterwards!
    Actually, what's the best temper for a bike lock? Too hard and it will be brittle, too soft it will be easily cuttable...would spring temper the best compromise?

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