What is the meaning of Hard steel?

Steel hardened by the addition of other elements, as manganese, phosphorus or (usually) carbon.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). hard steel. Retrieved September 26, 2026, from http://smartdefine.org/hard_steel/definitions/2015014
ChicagoWebster's. 2011. "hard steel" http://smartdefine.org/hard_steel/definitions/2015014 (accessed September 26, 2026).
HarvardWebster's 2011, hard steel, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/hard_steel/definitions/2015014>.
MLAWebster's. "hard steel" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/hard_steel/definitions/2015014>
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