英语语法分析

With high strength, high toughness and good hardenability.

具有高强度、高韧性和良好的淬透性。

The addition of Nickel and Copper improves the hardenability and the baldness.

加入镍和铜，钢的淬透性提高，硬度增加；

This is very useful for decrease on composition fluctuation range of gear steel and control on narrow fluctuation hardenability.

对减小齿轮钢的成分波动范围，保证窄淬透性的控制有重大意义。