Better control of different layer may be essential to good combination of high-speed steel with nodular graphite cast iron.

控制好扩散层是实现高速钢与球墨铸铁良好结合的关键。

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Better control of different layer may be essential to good combination of high-speed steel with nodular graphite cast iron.

控制好扩散层是实现高速钢与球墨铸铁良好结合的关键。

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