oil hardening

British

noun

a process of hardening high-carbon or alloy steels by heating and cooling in oil Compare air hardening

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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To prevent lubricating oil hardening upon the parts of the machinery when in use, add a third part of kerosene.

From Getting Gold: a practical treatise for prospectors, miners and students by Johnson, J. C. F. (Joseph Colin Frances)

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