As I understand it, you drop it in LN or at least dry ice for up to a day
immediately after quenching. Then draw the temper.
Or do I have that backwards?
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Its a little more complicated than that. The tool is not suppose to come
in contact with the cryogenic fluid. It is a slow process (24 hrs or
more) with slow ramps and soaks at key temperatures. What temps? Those
are the trade secrets. I attended a seminar of a company that was trying
to sell the service to improve the life of lead cutters on circuit board
trimmers. Didn't buy into then, still not convinced its useful in real
My 2 cents
Tim Williams wrote:
This isn't the way it's done in industry. Ideally, cryo tempering is done
after the initial, normal temper cycles, and the part is again tempered
normally afterward. Often, though, there is a big time delay between the
first temper and the cryo because the processes can't be done in the same
All the reputable facilities use long ramp times to reduce hazards to the
parts and increase the effectiveness of the process. A typical cryo cycle
involves a ramp down to the -300 to -320 F neighborhood over a 10-hour
period, a 20-24-hour soak, ramp back to ambient over 15-20 hours,
followed by two or three two-hour high-temperature temper cycles. (Boy,
that's a mouthful.)
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