What is the difference between Q355NH weathering steel and Q355GNH weathering steel

Q355NH weathering steel is a weather-resistant structural steel that is a low-alloy steel series between ordinary steel and stainless steel. It is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. Q355NH weathering steel has the strength, ductility, forming, and welding of high-quality steel. Cutting, abrasion, high temperature, fatigue resistance and other characteristics; weather resistance is 2-8 times that of ordinary carbon steel, and coating property is 1.5-10 times that of ordinary carbon steel. Q355NH weathering steel is mainly used for railway vehicles, bridges, towers and other steel structures exposed to the atmosphere for a long time.

Q355GNH weathering steel is a steel that adds a small amount of alloying elements such as Cu, P, Cr, Ni, etc. to form a protective layer on the surface of the metal substrate to improve the atmospheric corrosion resistance. Q355GNH weathering steel has the properties of high-quality steel such as toughness, ductility, forming, welding, abrasion, high temperature and fatigue resistance.

The weather resistance of Q355GNH weathering steel is 2-8 times that of ordinary carbon steel, and the coating property is 1.5-10 times that of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, and labor and energy saving. The performance and composition of Q355GNH weathering steel are better than Q355NH weathering steel, and the price is higher.