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Bruno-I was talking about "as quenched" hardness up to 64 with a proper soak in o1, not suggesting to aim for 64 as an end result. and Bruno- the statement on tempering as a stress relief- i agree...

with a proper "soak time" in the o1 you could be hitting 64 after tempering at 350f. not sure about that 10 min tempering time though, can you point me to the info where you got that? if 10 min does...