territorialmillworks Posted May 29, 2011 Share Posted May 29, 2011 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 Quote Link to comment Share on other sites More sharing options...
monstermetal Posted May 29, 2011 Share Posted May 29, 2011 Quench in oil, Temper at 400 deg and you should get high 30 to mid 40 Rc Quote Link to comment Share on other sites More sharing options...
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