Weathering steel, namely atmospheric corrosion resistance steel, is between ordinary steel and stainless steel low alloy steel series, weathering steel is made of plain carbon steel added a small amount of copper, nickel and other corrosion resistant elements, with high quality steel toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics; Weather resistance is 2~8 times of ordinary carbon steel, coating is 1.5~10 times of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance, life extension, thinning and consumption reduction, labor saving and energy saving.