Originally Posted by tpter1

So would I, B15. So would I. I know that things are done in a different process.

I did a google search on Cryogenic treatment of brass instruments and came up with this:

• ncrease resistance to abrasive wear
• Requires only one permanent treatment
• Changes the entire grain structure of the metal, not just the surfaces
• Refinishing or regrinds do not affect permanent improvements
• Eliminates thermal shock through a dry, computer controlled process
• Transforms most retained austenite to hard martensite
• Forms micro-fine carbide fillers to enhance carbide structures
• Increases durability and wear life
• Decreases residual stresses in tool steels
• Decreases brittleness
• Increases tensile strength, toughness and stability
• Relaxes internal stresses
• Works on new or used tools
• Reduced down time, less maintenance and higher productivity
• Deep cryo processing is compatible with other treatments (TiN, Chrome, Teflon etc.)
• High alloy steel cutting tools stay sharper longer, fewer micro-cracks, less chipping
• Results in the orderly arrangement of crystals, increases internal bonding energy, and achieves a structural balance throughout the mass of the material

which I copied and pased from http://www.cryoplus.com/advantages.html

How is it different from exposing to an overnight temp of 25F? I don't know.