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I had my first batch of stainless blades suffer from this bending too. I checked straightness after grinding but not anymore after hand sanding (sometimes without solid support) . And when you're in a hurry to get several blades ready to ship to a prof. heat-treater it hurts afterwards when you need to put on handle scales.
D2 is tough, doesn't take a fine finish easy but makes fine blades .
Bob Dozier tempers his D2 three times for two hours.( so I'm told)
and gets great performance.(no sub-zero quench).(If I'm wrong on Bob's tempering cyles here, someone please correct me)
Jan
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