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用球墨铸铁生产形状复杂的重要机器另件,由於在铸件的上部和中心发生有非金属夹杂物,形如黑斑,而使另件大量报废。在(工程技术及机器制造科学研究院)所推薦之施工过程中,是以盛有镁或镁合金的钟形罩深沉铁水中的方法以改进施工过程,使其更适合於生产条件的。例如,及用10～20％的镁与矽铁之合金,将其加入盛有铁水的包子内;用20％的镁与镍之合金加入铁水中。
Nodular cast iron with the production of complex shapes important parts of the other parts, due to the upper part of the casting and the center of non-metallic inclusions, such as black spots, leaving a lot of scrapped pieces. In the construction process recommended by the Institute of Engineering Technology and Machinery Manufacturing, the method of deep immersion in hot metal with bell-shaped cover of magnesium or magnesium alloy is used to improve the construction process and make it more suitable for the production conditions. For example, and with 10 ~ 20% of the magnesium alloy with ferrosilicon, add it to the fermenter filled with molten iron; with 20% magnesium and nickel alloy added to the molten iron.