Most modern ironmaking uses blast furnace ironmaking, with some using direct reduction ironmaking and electric furnace ironmaking. Steelmaking mainly uses pig iron produced by blast furnaces, sponge iron produced by direct reduction ironmaking, and scrap steel as raw materials, and uses different methods to make steel. The basic production process is to refine iron ore into pig iron in an ironmaking furnace, then use pig iron as raw material, refine it into steel using different methods, and then cast it into steel ingots or continuous casting billets.