Weathering steel, best-known under the trademark COR-TEN steel and sometimes written without the hyphen as `Corten steel`, is a group of steel alloys which were developed to eliminate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years. United States Steel Corporation (USS) holds the register.....
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http://en.wikipedia.org/wiki/Weathering_steel
(from the article `building construction`) ...Formed sheet aluminum is also used for opaque curtain-wall panels. Other metals used in curtain walls are stainless steel (a compound of 82 ...
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http://www.britannica.com/eb/a-z/w/18
A type of high-strength steel which can be used in normal outdoor environments without being painted. Should not be used in corrosive or marine environments.
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https://www.encyclo.co.uk/local/21107
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