Steel resistant to atmospherical corrosion

steel resistant to atmospherical corrosion

Corrosion occurs by the combined effect of water and oxygen and continues as long as water and oxygen are both supplied. Therefore, corrosion can be suppressed or prevented by avoiding water and oxygen from direct contact with the surface of a steel sheet. Painting and chemical treatment are carried out to achieve this.
The ultimate target for steel materials used in air, with regard to corrosion resistance, is to use them in the unpainted condition without excessive alloying of Ni and/or Cr. The materials developed for this purpose are referred to as atmospheric corrosion-resistant steels (weathering steels). The corrosion loss of atmospheric corrosion-resistant steel is only half that of ordinary carbon steel.
Atmospheric corrosion-resistant steel boasts a long history. Full study of such kind of steel started in Europe and America in the 1910s and CORTEN is the first commercial product of its kind developed and distributed under the trade name by U.S. Steel of the USA.
In the latter half of the 1950s, Japan introduced the technology of CORTEN. Since then, each of Japan's steel companies has started developing such steel on its own. Sumitomo Metals has also provided atmospheric corrosion-resistant steel under the trade name of CR2.
According to the Japanese Industrial Standards (JIS), there are atmospheric corrosion resisting steel for welded structure SMA and superior atmospheric corrosion resisting steel SPA, and SMA has plates for painting (P) and those for non-painting (W).
The main weathering steel with S235J2WP, S355J2WP, A588GRA, Corten A, Corten B etc.
BEBON as an excellent Chinese suppliers and manufacturer, can provide these weathering steel products of all kinds of information, including price, chemical properties and mechanical properties, if you need our help, please contact us.