Weathering steel plate is generally used in concentrate into the furnace - smelting (converter, electric furnace - micro-alloying treatment - blowing argon - LF refining - low-superheat continuous casting (feeding rare earth wire) - controlled rolling and cooling and other process routes. In the smelting, scrap with the charge together with the furnace, smelting according to the conventional process, after the steel to add deoxidizer and alloy, steel by blowing argon treatment, followed by casting, blowing argon tempering steel cast into slabs by continuous casting machine. Due to the addition of rare earth elements to the steel, weathering steel plate is purified, the content of inclusions is greatly reduced.