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Old 01-20-2015, 11:11 AM
samuraistuart samuraistuart is offline
Steel Addict
 
Join Date: Dec 2012
Location: San Antonio Texas
Posts: 163
Once the PN is reached by the quench medium.....you'll have max RC. Reaching the PN in the correct time gives max RC. Not anything to do with cooling below PN.

Grain structure is not affected by heat below 1350F.

Anything else different by speeding up the cooling from 900 to 400? NOPE. Except maybe internal stress may be greater.

It is that 900 to 400 range where the steel is flexible enough to be bent by a gloved hand for straightening. Until it hits about 400 or so where martensite begins to form.
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