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? 4140 PH punches?

territorialmillworks
in Heat Treating, general discussion

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Want to make some 3/4" dia X 3" long PH punches out of 4140. Planned on turning down a groove in the shank for holding with bolt tongs, forge to shape and then HT in an oven I've built. Probably not the best steel to use under a power hammer but it's what I've got and I've got 5 feet so....Question is,what hardness should I be looking at when I temper? Any suggestions/advise appreciated. Keith

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