Durability is the most important criterion used to define the quality of a gear. The freezing of metals has been acknowledged for almost thirty years as an effective method for increasing durability or wear life, and decreasing residual stress in tools steels. The recent field of deep cryogenic (below-300°F) has brought high super conductors, the superconducting super collider, cryo-biology, and magneto hydrodynamic drive systems. It has also brought many additional durability benefits to metals.
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