The ability of low grade steel to be hardened is related to its carbon content. Rolling it in carbon powder and reheating will case harden it. To harden throughout followed by tempering requires a steel with a higher carbon content than mild.
It will depend on what you make your snaps out of. I make mine from EN24T and do not harden further. All my rivetting is done hot and this works fine.
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Adrian Barrell
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