Corten steel (often referred to as Cor–Ten) is a weather resistant steel which could more accurately be termed as an "Atmospheric Corrosion Resistant Steel
Weathering means that due to their chemical compositions COR-TEN A and COR-TEN B steels, when utilised unprotected, exhibits increased resistance to atmospheric corrosion compared to unalloyed steels. This is because it forms a protective layer on its surface under the influence of the weather.
The first weathering steel bridge in the UK was a footbridge at York University in 1967 and the material was used for many bridges around the UK in the following 30 years or so. However, the use of weathering steel on bridges has increased significantly since 2001 when a former restriction on the use of the material over highways with less than 7.5m headroom was removed. It is now the material of choice for a wide range of bridge decks.
How weathering steel works
In the presence of moisture and air, all low alloy steels have a tendency to rust, the rate of which depends on the access of oxygen, moisture and atmospheric contaminants to the metal surface. As the process progresses, the rust layer forms a barrier to the ingress of oxygen, moisture and contaminants, and the rate of rusting slows down.
The rust layers formed on most ordinary structural steels are porous and detach from the metal surface after a certain time, and the corrosion cycle commences again. Hence, the rusting rate progresses as a series of incremental curves approximating to a straight line, the slope of which depends on the aggressiveness of the environment.
With weathering steel, the rusting process is initiated in the same way, but the specific alloying elements in the steel produce a stable rust layer that adheres to the base metal, and is much less porous. This rust ‘patina’ develops under conditions of alternate wetting and drying to produce a protective barrier that impedes further access of oxygen, moisture, and pollutants. The result is a much lower corrosion rate than would be found on ordinary structural steel.
Weathering steel Recommended corrosion allowances |
| Atmospheric corrosion classification (BS EN ISO 9223[5]) |
Weathering steel environmental classification
|
Corrosion allowance
(mm / exposed face) |
C1, C2, C3
|
Mild
|
1.0
|
C4, C5
|
Severe
|
1.5
|
(none)
|
Interior (box girders)
|
0.5
|
Benefits of using weathering steel
Conventional steel bridges that take advantage of the latest advances in automated fabrication and construction techniques are able to provide economic solutions to the demands of safety, rapid construction, attractive appearance, shallow construction depth, minimal maintenance, and flexibility in future use. Weathering Steel bridges have all these qualities, plus the following further benefits.
Weathering Steel Bridges are suitable for use in most locations. However, as with other forms of construction, there are certain environments that can lead to durability problems. The performance of weathering steel in extreme environments will not be satisfactory, and its use should be avoided in such situations.
Corrosion resistant steel is used for various types of welded, bolted and riveted constructions e.g. steel frame structures, bridges, tanks and containers, exhaust systems, vehicles and equipment constructions.
As a very long history company, Shanghai Katalor Enterprises had enough experience about the quality, price for these goods in China Market. we are a professional Weathering steel stockist and supplier. We can supply different product type and grades of Corrosion resistant steel. If you want to get the price, please do not hesitate to contact us.
Company Name: Shanghai Katalor Enterprises
Address：Room 301,Unit 6,lane 2500,xiupu Road, Kang qiao Industrial Area, Pu dong New District, Shanghai
TEL:0086-21-61182423
Fax :0086-21-61182425
E-mail:info@katalor.com
Phone:0086-18317160019
Address：Room 301,Unit 6,lane 2500,xiupu Road, Kang qiao Industrial Area, Pu dong New District, Shanghai
TEL:0086-21-61182423
Fax :0086-21-61182425
E-mail:info@katalor.com
Phone:0086-18317160019
learn more:http://construction-steel.com/News/What-are-the-main-characteristics-and-benefits-of-Weathering-or-Corrosion-Resistant-Steels.html
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