For many decades ferrosilicon producers have sought to improve gray and ductile iron inoculants. This developmental work resulted from changes in the primary iron melting method. Medium-frequency coreless induction melting rapidly replaced cupola melting due to environmental requirements. More steel and purchased scrap were replacing some (or all) of the pig iron in the charges, and a general increase in the average melting temperature resulted in greater metal oxidation state. Further,
Custom-Blended Additives Outperform Traditional Inoculants
For melting gray and ductile irons, non-ferrosilicon-based oxygen- and sulfur-containing formulations are more potent, more affordable, and improve mechanical and machining properties.