Corten-A steel plate (corrosion-tensile steel) that is: weather-resistant corrosion-resistant, high tensile strength steel (atmospheric-corrosion-resistan, hghstrength steel) for short.
Corten-A steel in 1958 was first used in the building aspects of electricity (one three seventy-one eighty-eight eight zero three seventy-six) order, because it has corrosion-resistant properties, and then used for bridges, trains, cars, trucks and industrial facilities, etc., the use of a wide range of increasingly. In terms of bridge applications, the United States, Japan example, the most heavy Heinz East of the Arakawa Steel Bridge, 840 meters long, is the use of all Corten-A steel construction.
Types and chemical composition of Corten-A:
Corten-A this kind of weathering steel (weathering steel), is in the ordinary steel by adding a little copper, chromium, phosphorus and other elements, and made by special treatment, its weathering and corrosion resistance, compared with the ordinary steel material is three to eight times higher. According to the different types and uses, CortenA can be divided into four kinds: COR-TEN A, COR-TEN B, COR-TEN C, COR-TENB-QT. Among them, COR-TENA's weathering and corrosion resistance is five to eight times better than that of ordinary steel, while COR-TENB is four times better than that of ordinary steel. 1, this technical condition adopts the ASTM/A588M- 87Gr. 87Gr.A standard, applicable to the manufacture of boiler components with no more than 200mm thick steel plate.
Corten-A anti-corrosion principle:
The atmospheric corrosion resistance of Corten-A is due to the formation of a dense layer of rust on the surface of the steel, which effectively stops the rust from continuing to grow by isolating the steel matrix from the air.The special elements contained in COR-TEN form a film of oxides when they come into contact with the atmosphere, and this strong film isolates COR-TEN from the outside world and is no longer subjected to the effects of the climate, which results in the weathering and corrosion resistance. When Corten-A or ordinary steel material is exposed to the atmosphere, and contact with moisture and oxygen, chemical reaction will occur.
