Silicon aluminum alloy is a composite strong deoxidizer. The density of silicon aluminum alloy is higher than that of pure aluminum, which makes it easier to enter molten steel and has less internal burning loss. The use of silicon-aluminum alloy in the steel refining process, and then the utilization rate is much higher than that of pure aluminum alone. Deoxidation of silicon-aluminum alloy to form a low-melting product can improve the quality of the steel.