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Imo, other than feeding into the steel fetish of the knifemaking world, a 52100 razor makes as much sense as a bookshelf made of reinforced concrete. None of the benefits of the material are useful,...

I temper at least an hour and half at 392. Usually 2 hours, after which I turn off the oven and leave it there to cool off.
I've found anything less than an hour too short.

And as Mike says,...