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Originally a US Steel trademark for a type of Weathering steel. First sold in 1933, the name Cor-Ten is now used generically for all weathering steels. It contains 0.2-0.5 % copper and phosphorus and it readily forms a thin, protective brown patina in outdoor environments. Cor-Ten has approximately 5 times the weather resistance of regular Carbon steel.

Synonyms and Related Terms

Wetterstahl (Deut.); aço corten (Port.); weathering steel; Corten (sp)


Not recommended for use as roofing or siding.

Physical and Chemical Properties

Resistant to abrasion and acid rain.

Resources and Citations

U.S. Steel: Website

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