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在灰铸铁中加入少量Ａｌ－Ｃｕ或Ｃｒ－Ｆｅ合金，改善石墨形状及大小，可大大提高在复分解法制取硝盐和氯化铵中所用铸铁蒸发锅的耐蚀性。
Adding a small amount of Al-Cu or Cr-Fe alloy to gray cast iron to improve the shape and size of graphite can greatly improve the corrosion resistance of the cast iron evaporating pan used in the salt production and ammonium chloride preparation by the metathesis method.