Positive pressure quench means air cooling under pressurized air, i.e., not still air. Usually they specify at least 2atm. I use this with S30V. After an interrupted oil quench I go immediately to pressurized air by placing the blade in a large tube and blasting air from my compressor through it until the blade is cool. Its the only way to get S30V to maximum hardness and toughness as far as I can tell ...
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