1. High weathering steel High weather resistance structural steel is a small amount of copper, phosphorus, chromium and nickel added to the steel type to form a protective layer on the surface of the metal collective to improve the resistance of the steel to atmospheric corrosion. , Titanium, zirconium and other elements to refine grains, improve the mechanical properties of steel, improve the strength and toughness of steel, reduce the brittle transition temperature, so that it has better resistance to brittle fracture.
2. Weathering steel for welding structure The elements added to the steel type are basically the same as the high-weather-resistant structural steel except for phosphorus, and their functions are also the same, and improve the welding performance.