What is Corten Steel? Why is it popular?
Weathered
steel, also known as Corten steel, is an
alloy of steel commonly used outdoors. Corten steel was designed to eliminate
the need to paint. If left outside in the elements, it will develop a rusty
appearance within just a few months. Coal wagon manufacturers in America in the 1930’s noticed certain steel
alloys developed a layer of rust that instead of corroding the steel, protected
it. With the brand name Corten – an abbreviation for corrosion resistance,
tensile strength – these alloys soon gained popularity among architects
(possibly the best example being the John Deere World Headquarters in Illinois,
designed by Eero Saarinen) which persists to this day.
Alloys continued to be developed to increase their strength and
durability. In time, the name lost its hyphen and became a generic term. A Corten
steel wall is also known as weathering steel or weathered steel. CORTEN is
a trademark owned by U.S. Steel. CORTEN refers to two of this type of
steel’s distinguishing properties: corrosion resistance and tensile
strength. USS sold its discrete plate business to International Steel
Group (now Arcelor Mittal) in 2003, but it still sells CORTEN branded material
in strip-mill plates and sheets. The original CORTEN received the standard
designation A242 (CORTEN A) from the ASTM International standards group. Newer
ASTM grades are A588 (COR-TEN B) and A606 for t.
Corten is popular with architects and sculptors
because of the exterior layer of rust that forms on its surface when conditions
are right. The mute-reddish brown colour of Corten makes it stand out like the
red rock faces of Utah, Texas, and South America. These naturalistic steel
patinas look stunning on large, imposing surfaces.
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