Weathering steel, that is, atmospheric corrosion resistant steel, is a series of low alloy steel between ordinary steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of copper, nickel and other corrosion resistant elements. It has the characteristics of high quality steel, such as toughness, plastic ductility, molding, welding, cutting, abrasion, high temperature, fatigue resistance, etc; The weather resistance is 2~8 times of that of plain carbon steel, and the painting performance is 1.5~10 times of that of plain 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. Weathering steel is mainly used for railway, vehicle, bridge, tower, photovoltaic, high-speed engineering and other steel structures exposed to the atmosphere for a long time. It is used to manufacture containers containing hydrogen sulfide corrosion medium and other structural parts in containers, railway vehicles, petroleum derricks, seaport buildings, oil production platforms and chemical and petroleum equipment.