Cooling from Temper

Three would only be useful on a very RA prone stainless super alloy. In normal blade steel, the amount of RA after the first temper is very small or nil. If three are done, it won't hurt anything, but there should be no measurable gain.
 
Good stuff as usual, sir. My experience with the 1250F stress relief for 1 hour with W2, 1084, 1084/15N20 mix and CruForgeV is that it virtually eliminates any warping during the quench. Take that for what it is worth. ;)
 
would there be any benefit in the RA prone steels to water quench at about 400 degrees right out of the plates?
 
Actually, in that range is where you want to let the steel cool slow and evenly. From 200 to room temp a quench would not hurt, but is not really needed.
If any of the steels with RA problems are tempered in the 900-1000F range, fairly rapid cooling from 800 to below 400 is better, as it avoids the temper embrittlement zone.

All that said, I don't know how little the difference would be if you quenched from 900F or let it cool in the plates....my suspicion is very, very little.
 
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