Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. The weathering plate is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. ~8 times, and the paintability is 1.5~10 times that of ordinary carbon steel.
Weathering steel is different from ordinary steel, in the beginning, it will rust on the surface like ordinary steel. This process is even faster than normal steel due to its higher degree of alloying. However, due to the more complex lattice inside the weathering steel, a dark black dense rust layer will grow under the loose rust on the surface. In this dense rust layer, nickel atoms replace part of the iron atoms, so that the rust layer has cation selectivity and resists the permeation of corrosive anions.
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Weathering steel plate generally adopts the process route of fine material feeding into the furnace - smelting (converter, electric furnace - microalloying treatment - argon blowing - LF refining - low superheat continuous casting (feeding rare earth wire) - controlled rolling and controlled cooling. During smelting, The scrap steel is added to the furnace together with the charge, and smelted according to the conventional process. After tapping, the deoxidizer and alloy are added. After the molten steel is treated with argon blowing, it is immediately cast. Rare earth elements are added to the steel, the weathering steel plate is purified, and the inclusion content is greatly reduced.
Weathering steel is mainly used for steel structures that are exposed to the atmosphere for a long time, such as railways, vehicles, bridges, towers, photovoltaics, and high-speed projects. It can also be used to manufacture structural parts such as containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers for sulfur-containing corrosive media in chemical petroleum equipment. In addition, due to the unique appearance of weathering steel, it is also often used in public art, outdoor sculpture and building exterior wall decoration.