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

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for air-hardening

Historical Examples

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

    Inventors at Work

    George Iles