Silicon aluminum iron alloy is a deoxidizing agent used in steelmaking, which improves the morphology of inclusions and reduces the content of gaseous elements in the molten steel, representing an effective new technology for enhancing steel quality, lowering costs, and conserving aluminum usage. Particularly suitable for continuous casting steel deoxidation requirements, it has been proven in practice not only to meet steelmaking deoxidation needs but also to possess desulfurization properties, high specific gravity, and strong penetration capabilities.