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在用镁处理生铁时,发生去硫作用而形成的硫化镁,事实上不溶于铸铁,它浮在铁水的上层,但并不转入浮渣内。在铸件中的硫化镁杂质,就成了暗灰色的斑点。在用镁处理铸铁的过程中,硫化铁及硫化锰中疏的平衡含量保持在十万分之几的范围内。而和化学分析的数值比较,所多余的硫在生铁中就成为小的硫化镁杂质。超过平衡量成为硫化铁形态的少量的硫,它完全不影响铸铁中硫的总含量,但都说明镁并没有完全使铸铁饱和。铸铁在这种情况下,可能全部或部分具有片状石墨。
In the treatment of pig iron with magnesium, desulfurization occurs and the formation of magnesium sulfide, in fact insoluble in cast iron, it floats in the upper layer of molten iron, but not transferred to the scum. In the casting of magnesium sulfide impurities, it has become a dark gray spots. In the treatment of cast iron with magnesium, iron sulfide and manganese sulfide in the balance of sparse balance maintained within a few hundred thousandths of a few. Compared with the chemical analysis of the value, the excess sulfur in the pig iron to become a small magnesium sulfide impurities. Exceeding the balance, the small amount of sulfur that becomes the form of iron sulphide, does not affect the total sulfur content of the cast iron at all, but shows that magnesium does not completely saturate the cast iron. In this case, cast iron may have flake graphite in whole or in part.