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  • Users: MarSeb
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  1. MarSeb

    4140 Surface Hardness

    Hello, I am trying to harden a 4140 bar to RC 52-55. Is there a reason why the surface hardness on this bar would be so low (RC 10) compared to the hardness at a depth of .050 in where the hardness reaches 52? Any help will be appreciated. Thanks!

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