采用扫描电镜对离心球铁管承口处的铸造缺陷（缩孔、气孔、渣孔和皱皮等）进行了分析。提出了防止产生缺陷的工艺措施，如防止皱皮的发生，除控制铁液的浇注温度外，还应防止铁水的氧化及适当的残留镁量（０．０３～０．０５％）。满足上述工艺措施，提高了球铁管的成品率．稳定了产品质量。 Scanning electron microscopy (SEM) was used to analyze casting defects (shrinkage, porosity, slag hole, wrinkled skin, etc.) in the centrifugal ducts. Proposed to prevent defects in the process measures, such as preventing the occurrence of wrinkled skin, in addition to controlling the pouring temperature of molten iron, but also to prevent the oxidation of molten iron and the appropriate amount of residual magnesium (0.03 ~ 0.05%). Meet the above process measures to improve the ductile iron pipe yield. Stabilized product quality.