Weathering steel has the strength of high quality steel, plastic extension, forming, welding, corrosion, high temperature, fatigue resistance and other characteristics. The weatherability is 2-8 times of the general carbon steel, and the coating ability is 1.5-10 times of the general carbon steel. At the same time, weathering steel has the characteristics of toughness, rust resistance, corrosion resistance, thinning and consumption reduction, labor saving and energy saving.