预硬材料硬度淬火材料淬火前硬度淬火后硬度S50C~S55CHRC17°~22°2083HRC21.5°~24°HRC52°±1°718HHRC33°~37°2083HHRC28°~31°HRC52°±1°738HRC29°~33°2344HRC18°~21°HRC52°±1°738HHRC33°~37°S136HRC21°HRC53°±1°NAK80HRC37°~40°S136HHRC29°~33°HRC53°±1°NAK55HRC37°~40°8407HRC19°HRC51°±1°SKD61(DH31-S)HRC19°HRC51°±1°SKD11(DC11)HRC26°HRC58°±1°材料硬度参照表