Refrigeration – Processes – Treating an article
Patent
1991-08-30
1993-11-09
Bennet, Henry A.
Refrigeration
Processes
Treating an article
62 62, 62 65, 148577, 148578, 148905, F25D 1306, C21D 918
Patent
active
052592006
ABSTRACT:
A process for treating an article of metal containing material such as tool steel so as to improve the properties such as shockability, wearability, stability and hardness of the article. In one embodiment, the process comprises immersing the article at ambient temperature into liquid cryogenic material for a time period up to or equal to a set time period equal to the minimum cross-sectional dimension in inches times ten minutes. The article is then withdrawn from contact with the liquid cryogenic material and immediately subjected to a flow of air sufficient to raise the temperature of the article to ambient temperature in a period of time equal to or less than ten minutes plus ten minutes per minimum cross-sectional dimension in inches.
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Wilson, R. A., "Industry Warms Up to Supercold", Iron Age, Aug. 26, 1971 pp. 55-56.
Bennet Henry A.
Kilner Christopher
Nu-Bit, Inc.
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