Although its effects on metal composition are subtle, deep cryogenic tempering can yield dramaticimprovements in tool performance.In the search for cutting tool engineering that can increase productivity, prolong cutting life, and decrease costs, gains of 15% to 20% are considered significant. One recently developed tool treatment is showing far greater promise, in some cases improving tool life by 200% to 400%.
The method, called deep cryogenic tempering, subjects tools placed in a specially constructed tank to temperatures below -300 ° F for a number of hours using liquid nitrogen as the refrigerant. The process supplements standard heat/quench tempering, completing metallurgical changes that heat treatingbegins.
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