air-hardening

air-hard·en·ing

[air-hahr-dn-ing]
adjective Metallurgy.
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.

Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Air-hardening is always a great word to know.
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