采用铜合金金属型生产小型薄壁球墨铸铁件是铸造领域一项新技术。
Using copper alloy mould to make the small-sized and thin wall ductile iron castings is a new technology in the foundry field.
为了提高水冷型离心机球墨铸铁管的成形率，降低废品率，对球墨铸铁管气孔、针孔产生的原因进行了分析，并提出了一些预防措施。
The paper reported the development and fine property of the nodular cast iron pipe used in gas pipeline, as well forecasted its market prospect.
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