How does silicomanganese deoxidize steel?

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Silicomanganese is more effective at deoxidizing steel than using silicon or manganese individually. Its efficacy stems from the simultaneous reaction of both silicon and manganese with dissolved oxygen in the molten steel.1

This combined reaction produces manganous silicate, a compound that has a low melting point and can therefore readily separate from the steel. By facilitating this separation, silicomanganese helps remove oxygen, which is a critical step in the steelmaking process to ensure the quality and structural integrity of the final metal.12