Ferro silicon magnesium (FeSiMg) is a type of nodulizer that is commonly used in foundry and casting iron applications. It is a ferroalloy composed of iron (Fe), silicon (Si), and magnesium (Mg), with magnesium content typically ranging from 4-6%.

FeSiMg is added to molten iron to promote the formation of nodules or spheroids, which are small, rounded graphite structures that form within the iron matrix. This results in ductile or nodular cast iron, which has superior mechanical properties compared to gray cast iron, such as higher tensile strength, ductility, and impact resistance.

The amount of FeSiMg required depends on the specific application and the desired properties of the final product. Generally, 0.03-0.06% FeSiMg is added for every 1% of carbon present in the molten iron. The FeSiMg is usually added to the molten iron in the ladle, just before pouring, to ensure even distribution.

FeSiMg is available in various forms, including powders, granules, and briquettes, with the choice of form depending on the specific application and equipment available. It is important to handle and store FeSiMg properly to ensure optimal performance and safety.