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Great............ so happy for you.   Punches for what?  What sort of facilities do you have to HT?  What size are they?  Are they 4140 or are they just "chrome moly" (which could also be spring steel).  More info and maybe we can help you.



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Honestly the intended use would tell us the most as far as how to treat them,depending on what they will be used for and the size of them the answer could vary a lot.4140 is "supposed" to be hardened in oil...but in thick sections can be water quenched...then the application? if they are simple blacksmithing punches they may not need to be hardened at all.

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