magnesium residual(Magnesium residuals should be maintained at a higher level (0.045-0.055%) for heavy-section castings in order to avoid chunk graphite formation and other degenerate graphite forms. VLZ_58)
magnesium recovery(Calcium is an element which retards the rate of reaction of magnesium with the liquid iron and thereby improves magnesium recovery and reduces the reaction violence. VLZ_58)
