Effects of Cryogenically Treated Steel
ASM Handbook, Vol. 4, Heat Treating, ASM International, 1991, p 205
http://www.airproducts.com/NR/rdonlyres/3433A3DC-1899-4093-A094-9964342C38C0/0/33005019GLB.pdf [Broken] PDF - use 'Save target as'
Cool! er... so to speak.
This question keeps coming up over on the Cryogenics forum at Eng-Tips. I'll have to point all such questions over here for further consideration.
Edit - Link to additional information on cryogenic material processing:
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