The principle and design of tapered feeder for ductile iron castings were introduced.

介绍了球铁件锥形冒口的原理和设计方法。

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In short, we don't buy our ductile iron castings from an outside supplier, domestic or foreign.

简而言之，本公司并不是从公司外的国内或国外的供应商购买球墨铸铁铸件。

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In this paper, the string casting technique of small ductile iron castings with thick section were introduced.

介绍了厚实的球铁小件首尾相连组合串铸的工艺。

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