Enhancing the manganese tolerance of all grades of ductile iron

摘要

The final silicon (Si) content of poured ductile irons is always high when applying conventional magnesium (Mg) treatment practices; such as sandwich, tundish or cored wire, and inoculation practices. This includes preconditioning5, ladle, stream or in-mould inoculant additions. This is the well known 'silicon balance' problem which is caused by two main factors. The first being a poor level of Mg recovery (meaning a high addition of nodulariser) and the second is the need for efficiently counteracting the formation of cementite (meaning a high addition of inoculant).