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I made a lot of O1 blades and my formula is pretty much as Jim stated. Blade goes into a cold oven, temp ramps to 1200F as fast as it can, hold 5 minutes, then up to 1475, hold 10 minutes, quench in 150 degree Tough Quench.
One thing I do differently is that I don't do any grinding on the blade until the heat treat is complete - just a blade profile goes into the oven. I don't think I ever had an O1 blade warp, certainly not enough to lose the blade...
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