The paper reported the development and fine property of the nodular cast iron pipe used in gas pipeline, as well forecasted its market prospect.
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 forming mechanism of pinhole defect in no-solvent polyurethane coat on centrifugal nodular cast iron pipe is analyzed, some effective measures to eliminate offered.
分析了离心球铁管无溶剂聚氨酯涂层针孔缺陷形成的机理，给出了消除这一缺陷的有效措施。
It is introduced the design principal and operation method of CAD software for vanishing-mould casting process of nodular cast iron pipe. It can raise the design efficiency and precision.
介绍了球墨铸铁管件消失模铸造工艺的计算机辅助设计CAD软件的设计原理、操作方法，该CAD软件可提高消失模铸造球铁管件的工艺设计效率和设计精度。
From inner to outside, the composite pipe consisted of alumina ceramic layer, metal transition layer, white cast layer, carbon atom diffusion layer and nodular cast iron layer.
复合管从里到外由氧化铝陶瓷层、金属过渡层、白口铸铁层、碳原子扩散层、球墨铸铁层组成。
From inner to outside, the composite pipe consisted of alumina ceramic layer, metal transition layer, white cast layer, carbon atom diffusion layer and nodular cast iron layer.
复合管从里到外由氧化铝陶瓷层、金属过渡层、白口铸铁层、碳原子扩散层、球墨铸铁层组成。
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