Magnesium Recovery and Addition Rate in Tundish-Treated Ductile Iron

The calculations that are associated with such alloy additions are based on knowing the beginning and goal levels of the element and the recovery rate of that element from the alloy. These calculations are straightforward; Goodrich 3 described tin as having "been a popular alloy addition because it does not promote chill, is effective in stabilizing pearlite on the skin of the casting and has a predictable, 100% recovery."