In order to ensure smooth casting and rolling into qualified steel, a certain amount of deoxidizer is added to the molten steel for deoxidation at the end of smelting or during tapping, and at the same time, an appropriate amount of alloy is added to adjust the chemical composition according to the requirements of the steel specification. Generally, there are silicon-manganese alloys, Ferro-silicon, ferro-manganese, ferro-aluminum, silicon-aluminum-barium-calcium, etc., are reducing agents that prevent steel from being oxidized again at high temperatures;