Brine quench question

J

jackrabbitslim

Joined
Jan 28, 2008
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206
Okay, so I've read several times that a brine quench is a faster (and, debatably, harsher) quench than straight tap water. Okay. So. The addition of salt to water (especially in large enough amounts to saturate the solution) would raise the boiling point, right? So, is it a FASTER quench than water because it delays the formation of a steam jacket and remains liquid longer- thus allowing more energy to be transferred to the brine versus the less efficient energy conduction of a gas, i.e. the aforementioned steam jacket which would occur sooner with a water quench? Or is it something to do with the elevated mineral content of the brine somehow improving thermal conductivity? Am I way off track here? :foot:
 
The fastest quench is a 9 % solution of NaCl in water .It works because salt crystal are momentarily precipitated then explosively thrown from the surface of the metal.This disrupts the vapor jacket and causes agitation !!!.....
While we heat the oil in a oil quench ,and that does improve things ,water is different ...With both water and brine the quenching speed is greater at room temperature [as is the 'ping' risk !!].
 
mete said:
With both water and brine the quenching speed is greater at room temperature [as is the 'ping' risk !!].
Click to expand...

So how does heating or cooling a water or brine affect the quench speed? Are you saying that, while heating an oil speeds the quench, conversely, heating a water or brine quench would slow it down? Would that make it safer re: the ping factor?
 
The heating of oil to about 140 F is to improve the viscosity so it's the best quench speed/viscosity compromise...Your losing to much sleep over this !
 
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