O1 is best HT in an oven so you can get the best from the steel. Kind of hard to hold at 1475 for 10 minutes in a forge.lol
I have HT O1 in a forge, but don't know for certain what my as quenched hardness is and so won't know how long or hot to temper it. Still comes out good, but not as primo as it is capable of.
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