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I used to send my blades to a heat treat place that "sand blasted" them. They warped so many blades that I no longer use them. My heat treater now used inert gas which cuts down on the oxidation. It is my opinion that heat treating will enhance and deepen the grind furrows so I like to finish the knife to about 400 grit before sending to be treated. This might not be sound thinking, but in my own mind it helps prevent deep gouges and for me it works ok.
Best wishes, Larry Peterson
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