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