Corten steels contain special alloys that offer high resistance to atmospheric corrosion. These alloys typically include elements such as copper, nickel, chromium, and phosphorus. These elements control and slow down the rusting process, enhancing the steel’s durability against atmospheric conditions.

The superior corrosion resistance of Corten steel is achieved through a naturally forming oxide layer on the surface of the steel. This oxide layer covers the surface of the steel and prevents the core material from being exposed to corrosion. This layer is often referred to as “patina” and gives the steel its characteristic brown-orange color.

The patina layer forms over time depending on atmospheric conditions and defines the aesthetic appearance of Corten steel. Due to its durability and aesthetic appeal, Corten steel has become a popular choice for architectural applications where both performance and appearance are important.