1, Q355GNH steel plate grade expression: Q355GNH steel grade by the "yield strength", "weathering" of the first letter of the hanyu pinyin "Q", "GNH", the yield strength of the lower limit value and the quality level (A, B, C, D, E).
2,Q355GNH steel plate implementation standard: GB/T 4171-2008.
3, Q355GNH steel plate size, shape, weight and allowable deviation of the implementation of standards: GB/T709.
4,Q355GNH steel plate smelting method: Q355GNH is smelted by converter or electric furnace, and it is sedated steel. Unless the demand side has special requirements, the smelting method is chosen by the supplier.
5,Delivery state of Q355GNH steel plate: It is delivered in hot rolled, controlled rolled or normalized state.
6, Q355GNH steel plate atmospheric corrosion resistance: high weathering steel by adding a small amount of alloying elements such as: Cu, P, Cr, Ni, etc., so that it forms a protective layer on the surface of the metal matrix, in order to improve the resistance to atmospheric corrosion performance of the steel.Q355GNH steel belongs to the high weathering steel, which is widely used in vehicles, bridges, containers, buildings or other structural components. Compared with weathering steel, high weathering steel has better atmospheric corrosion resistance.
7,Q355GNH steel applications: Q355GNH is weathering steel, that is, atmospheric corrosion-resistant steel, is between ordinary steel and stainless steel series of low alloy steel, weathering steel from plain carbon steel to add a small amount of copper, nickel and other corrosion-resistant elements and become a high-quality steel with strong, plastic ductile, molding, welding and cutting, abrasion, high temperature, fatigue and other characteristics; weathering for the plain carbon steel, 2 ~ 8 times, painting for the plain carbon steel, 1.5 ~ 10 times. 1.5~10 times. At the same time, it is rust-resistant, so that the components of corrosion resistance and life extension, thinning and consumption reduction, labor-saving and energy saving features. Weathering-resistant steel is mainly used for steel structures that are exposed to the atmosphere for a long time, such as railroads, vehicles, bridges, pylons, photovoltaic, and high-speed projects. Used in the manufacture of containers, railway vehicles, oil derricks, seaport buildings, oil extraction platforms and chemical and petroleum equipment containing hydrogen sulfide corrosive media containers and other structural components.
