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)
Resistant to abrasion and acid rain.
Hazards and Safety
Not recommended for use as roofing or siding.
U.S. Steel: Website