本文从理论上分析了针孔形成的机理，讨论了影响灰铁及球铁件针孔形成的各种因素，并指出了防止针孔形成的工艺措施。
In this paper, the formation mechanism of pinholes in gray and ductile iron and the factors influencing their formation are discussed as well as a preventive measure is suggested.
该球化剂应用于高炉冷却壁，轧辊等关键球铁件上可提高抗拉强度和伸长率。
The properties of cores in the casts are enhanced when using this nodulizer in the key ductile iron casts, such as cooling wall of blast furnace and roller.
针对日益开始清晰的厚壁球铁件凝固特性，提出了获得其致密组织的较为系统的工艺设计思想； 以作者主持完成的典型的生产实例验证了控制方法的有效性，并在此基础上讨论了控制方法的拓展途径。
The paper is about how to obtain the densified structure of heavy-wall nodular iron castings under the condition of gravity foundry and to introduce the authors research in this area in detail.
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