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It refers to the low alloy structural steel with protective rust layer and atmospheric corrosion resistance, which can be used to manufacture steel structures such as vehicles, bridges, towers, containers, etc. Compared with ordinary carbon steel, weathering steel has better corrosion resistance in atmosphere. Compared with stainless steel, weathering steel only needs a small amount of alloy elements, such as phosphorus, copper, niobium, vanadium, titanium, etc., and the total amount of alloy elements only accounts for a few percent, unlike that of stainless steel, reaching more than 10 percent, so it is relatively cheap.

Curtain wall is the outer wall of a building. It is not load-bearing and is hung like a curtain. Therefore, it is also called hanging wall. It is a light wall with decorative effect commonly used in modern large-scale and high-rise buildings. The building envelope is composed of structural frame and inlaid plate, which does not bear the load and function of the main structure.