The most authoritative answer in 2024
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Felix Wilson——Works at the International Renewable Energy Agency, Lives in Abu Dhabi, UAE.
Case-
hardened steel is formed by diffusing carbon (carburization), nitrogen (nitriding) and/or boron (boriding) into the outer layer of the steel at high temperature, and then heat treating the surface layer to the desired hardness. ... Time and temperature determines how deep into the surface the
hardening extends.
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