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As Ray said, can't hold in a forge, I was talking about a heat treat oven with precise temperature controls and O1 comes out looking orange red under fluorescent lights, not bright orange. I was the HT guy at a machine shop and a fast heat may also be the reason for your knife warp now that I think about it. Another reason not to HT it in a forge, besides 1080 is much much cheaper and will make a good knife out of a forge.
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