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Because each oven heats differently i generally dial in my tempering numbers. If the book says 425f, I might temper at 380 or 400f, clean the edge, and check hardness with hardness files. If it checks out too hard then I dial oven up by 20 degrees to say 380/400f and temper again.. The files aren't exact but they get me close to the Rockwell I want.
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