试验研究了影响大断面铸态铁素体球铁组织的若干因素。结果表明，即使使用纯度不高的生铁，若控制Si的含量及应用微量元素Sb能完全消除大断面球铁中的碎块状石墨；在超厚壁500mm长方体中心获得完全球化的石墨；抗拉强度大于200MPa，延伸率大于9％，性能已达到原西德Castor标准。 Several factors affecting the microstructure of as-cast ferrite ductile iron in large section were experimentally studied. The results show that, even if the pig iron with low purity is used, if the content of Si is controlled and the trace element Sb is used, it can completely eliminate the massive graphite in the large-sectional ductile iron; Tensile strength greater than 200MPa, elongation greater than 9%, the performance has reached the original West Castor standards.