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The density of gray iron is mainly affected by the content of iron, carbon and other alloying elements. As the carbon content increases, the density of gray iron decreases. In general, the density of gray iron ranges from 6.9 to 7.3 g/cm³.

In addition, casting temperature and cooling rate will also affect the density of gray iron. Too low casting temperature will lead to the increase of inclusions in gray iron, thus reducing the density; The casting temperature is too high, the structure of gray iron will be loose, the density will be reduced. The cooling rate will affect the content of austenite and pearlite in gray iron, and then affect its density.