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air-hardening

[ air-hahr-dn-ing ]

adjective

, Metallurgy.
  1. noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.

air hardening

noun

  1. a process of hardening high-alloy steels by heating and cooling in a current of air Compare oil 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
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Word History and Origins

Origin of air-hardening1

First recorded in 1905–10
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Example Sentences

This alloy, because hardened simply in air, was called “air-hardening” or “self-hardening.”

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