淬火：是使渗碳的表面变硬，芯部变得有柔韧性的表面硬化工艺。
Hardening: Case hardening process whereby the carburized outer surface is made hard and strong while the center (core) is made tough and flexible.
淬火：是使渗碳的表面变硬，芯部变得有柔韧性的表面硬化工艺。
Hardening: Case hardening process whereby the carburized outer surface is made hard and strong while the center (core) is made tough and flexible.
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