Corten (Cor-Ten) is a general name for weathering steels. It is a low-alloy steel containing added copper, chromium, nickel, and phosphorus. Its name combines two material properties: corrosion resistance and tensile strength.
Corten's defining feature is its patina. Outdoors, its surface develops a dense layer of oxides that, unlike ordinary rust, does not flake off but slows further corrosion. This means Corten products do not need painting.
The color changes over time. Fresh metal is gray, then develops an orange-brown hue over several months, later turning a deep brown. The rate depends on the climate, humidity, and how often the surface gets wet and dries out. No two objects “age” in exactly the same way.
Why Corten is chosen for parks and cities: its warm, natural color complements greenery, stone, and wood; the material does not require regular painting; large forms made from sheet metal look monolithic and expressive.
Important considerations. While the patina is forming, rainwater washes away some oxides, which can leave rust-colored marks on light paving. This can be addressed through the choice of base and installation location. The patina needs wetting and drying cycles, so the design avoids areas where water constantly collects. In marine climates and persistently damp conditions, the material performs less effectively, and this requires a separate discussion.
If you are considering a Corten sculpture or art object, browse the “Corten” section of our catalog and send us an inquiry. We will discuss the shape, dimensions, and placement conditions.