COR-TEN steel is a special high-strength self-passivating alloy containing copper-chromium-phosphorus which, as the name indicates, has remarkable resistance to corrosion (COR-rosion) and tensile yield strength (TEN-sile) . The resistance to attack by atmospheric agents is five to eight times higher than that of a common carbon steel.

Characteristic of COR-TEN is the natural oxidation in contact with air: the "rust" finish stops after causing a slight decrease in thickness, forming a uniform and resistant patina that prevents the progressive spread of corrosion remaining unchanged for decades and reducing considerably periodic maintenance operations. It is a natural, ecological, 100% recyclable material.