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Cor-ten Steel, also referred to as weathering 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.
The name Cor-ten refers to the two distinguishing properties of this type of steel: corrosion resistance and tensile strength.
The corrosion-retarding effect of the protective layer is produced by the particular distribution and concentration of alloying elements in it. The layer protecting the surface develops and regenerates continuously when subjected to the influence of the weather. In other words, the steel is allowed to rust in order to form the protective coating.The original Cor-ten received the standard designation A 242 (Cor-ten A). Newer ASTM grades are A 588 (Cor-ten B) and A 606 for thin sheet.
For the construction of the TRUMPF Smart Factory, 270,000 lbs. of Cor-ten steel were used. A few famous landmarks also have chosen Cor-ten steel for outdoor architecture. The first use of weathering steel for architectural applications was the John Deere World Headquarters in Moline, Illinois. Other landmarks include the Barclays Center in Brooklyn, New York, or the Chicago Picasso sculpture in Chicago, Illinois.
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