The deep cryogenic tempering process for gears is an inexpensive, one time, permanent treatment, affecting the entire part, not just the surface. Gears may be new or used, sharp or dull, and re-shaping will not destroy the treatment.
The process of deep cryogenic or freeze tempering is really quite simple. “A freeze tempering process means that the material to be treated is not exposed to any liquid nitrogen, which eliminates the risk of thermal shock. The material is frozen through a thermo dynamic refrigeration cycle. The material is cooled slowly, held for a prolonged period of time 48-60 hours, and allowed to return to room temperature slowly.”
Source: http://coldfire.com.au/uploads/Deep_Cryo_Article-Ferland.pdf
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