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· Eye Master
4,294 Posts
One of the issues you will deal with is that there is through hardness, and then there is surface hardness. Surface hardness will not usually affect the overall strength of the part very much, but is excellent to resist surface wear.

Your non-destructive tester can not tell if the hardness it sees on the surface is really just on the surface, or if it is through hardened. This is why hardness tests are usually destructive - you need to split the part open so you can measure hardness both on the surface and in the core of the metal.

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