By means of extensive tests on nitrided and case hardened gears, it was attempted to discover the possibilities and the limits of nitriding for gears.
通过对氮化和表面渗碳硬化齿轮大量的试验研究，设法揭示对齿轮进行氮化处理的可能性和局限性。
Case hardened: a case hardened fastener is a fastener of ferrous material having a surface which has been made harder than the core.
表面硬化：表面硬化的紧固件是黑色金属，其表面经过处理后比内心硬度要高。
Most nonferrous metals can be annealed, but never tempered, normalized, or case-hardened.
而大多数有色金属可以进行退火，但不能进行正火或者表面硬化。
Aiming at heavy duty and low speed gear transmission, Zheng Zhou Research Institute of Mechanical Engineering puts forwards ZY-1 case- hardened double-circular-arc gear.
为此，郑州机械研究所针对低速重载齿轮传动领域设计了ZY-1型硬齿面双圆弧齿轮齿形。
Main ingredients: green tea essence, almond oil, mint, cationic active agent, high elastic case-hardened cells and etc.
主要成分：绿茶精华、杏仁油、薄荷、阳离子活性剂、高弹性定型因子等。
Main ingredients: green tea essence, almond oil, mint, cationic active agent, high elastic case-hardened cells and etc.
主要成分：绿茶精华、杏仁油、薄荷、阳离子活性剂、高弹性定型因子等。
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