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- Nov 16, 2002
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It would be very unlikely for a high speed steel like M2/M4 to lose hardness during coating. The very reason for it's existence is it's ability to hold it's hardness and not to lose it's temper to a red heat. And coated HSS tooling is almost industry standard today.
Good point. Thanks! I forget that some of my favorite steels have a lot more tungsten than others.