How to calculate the amount of ductile iron inoculant added?

(1) The amount of inoculant added in ductile iron is generally higher than that in gray cast iron;

(2) If the pouring time of the molten iron after inoculation treatment is long, the addition amount should be increased due to inoculation decline;

(3) Thin-walled castings are prone to white mouth, and the amount of inoculant added should be increased accordingly;