The principle of weathering steel

"1. The principle of weathering steel"

Weathering steel, also known as "corrosion-resistant steel" or "Corton steel", is a low-alloy steel series between ordinary steel and stainless steel.

In the natural climate, the weather-resistant steel forms a dense oxide layer between the rust layer and the matrix by adding weather-resistant elements such as niobium, molybdenum, phosphorus, and titanium.

Due to the existence of this layer of dense oxide film, it prevents oxygen and water in the atmosphere from penetrating into the steel substrate, and slows down the development of corrosion into the steel material, thereby improving the atmospheric corrosion resistance, and the atmospheric corrosion resistance is 2~ of that of ordinary carbon steel. 5 times.

"2. Development History of Weathering Steel"

In the early stage of research and development, weathering steel was used as an industrial material and was applied to construction, ships, railways and other fields. The United States carried out research on weathering steel earlier. Corton steel originated in North America is widely used in the production of train carriages, containers and bridges.

Japan began research on weathering steel in 1955, and used weathering steel in bridge construction in 1967.

China's research on weathering steel began in 1960. The Wuhan branch of the Beijing-Guangzhou line opened to traffic in October 1992 is the first special steel for atmospheric corrosion-resistant bridges developed in China. Although China's research on weathering steel is not very early, it has a long history. It has a long history and is now a big country in the production and export of weathering steel.