nodular cast-iron pipe

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。

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。