Have you used this yourself in some other application?
That sounds like the tempering process that makers would harden their blades with: they would heat it (red hot, so it turns amagnetic), the immediately cool it with a bath of some sort. This will harden the blade so it will take edge. Could be that sticking them to freezer/cryogenically freezing might relieve the stress from the process. Other thing I've heard is that they are heated to some lower temperature and let to cool slowly to remove brittleness. Do notice that I'm not a smith or a metallurgist.
Whether you would need to do it after shaving? I dunno... The usage temperature is a fraction of the tempering temperatures, even if you stuck it to a freezer. I certainly won't be trying it with my razors =)