air-hardening steel

air-hardening steel

[′er ¦härd·niŋ ′stēl]
(metallurgy)
A steel whose content of carbon and other alloying elements is sufficient for the steel to harden fully by cooling in air or any other atmosphere from a temperature above its transformation range. Also known as self-hardening steel.
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Air-hardening steels cool more uniformly, so distortion and risk of cracking are lower.