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kõrgel temperatuuril ( punahõõguse piirkonnas) säiliv materjali kõvadus (vrd külmkõvadus), the ability to retain hardness at increased temperatures at which a material becomes red hot (compare: cold hardness)
краснотвердость . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/%D0%BA%D1%80%D0%B0%D1%81%D0%BD%D0%BE%D1%82%D0%B2%D0%B5%D1%80%D0%B4%D0%BE%D1%81%D1%82%D1%8C/1/rus (06.10.2026)