Corten Steel
What is Corten steel?
Corten steel (often referred to as Cor-Ten) is a weathering steel material that is widely used for sculptures, construction and cladding. The material Corten steel is actually an alloy of copper, nickel and chromium that displays an interesting reaction to weathering whereby it takes on an orange/brown appearance which is largely dependent on the environment it it used in. Over time Corten steel forms a protective layer that is actually weather-resistant despite it's unique rusting appearance. Corten was originally developed to remove the requirement for metal finishing such as galvanizing or painting to weatherproof the steel.
How does Corten steel weather?
Contrary to popular misconception, corten does not rust as it weathers (unless water is allowed to gather). The protective outer layer of the corten steel constantly develops and regenerates over time, reacting to airborne pollutants -the effect is increased dependent on the environment and atmosphere - a high salt seaside location for example would have a more rapid cycle.
The benefits of Corten steel are therefore immediately clear - a steel that does not require any treatment before erection or regular maintenance is therefore economic, long-lasting and recyclable- it also looks unique.
Weathering steel is not however without it's problems and careful consideration must be taken upon each individual project- especially those of a structural nature. Natural weathering will cause rust stains to develop and potentially contaminate surrounding areas or materials and water should not be allowed to gather on the surface as this will eventually lead to the more common rusting whereby the steel begins to corrode.
Where is Corten steel used?
Corten steel's unique appearance is instantly recognizable and is most popularly known for its use in constructing The Angel of The North. Many other sculptures also use Corten steel, especially garden features and artwork projects.
The second most popular use of Corten steel is building cladding - many architects now specify this unique 'rusting' material for a modern but not over-the-top look for the facade of a building. Many Corten clad structures and building have been completed extremely tastefully making a change from the latest trend-wave of glass buildings.
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