Corten is a trade name for a steel alloy material originally produced by United States steel . Corten is a weathering steel. This material is a corrosion resistant steel, that left uncoated develops an outer layer patina. This patina protects the steel from additional corrosion.
Benefits of weathering steel
- Reduced toxic emissions: No oil-based coating is used, which reduces emissions of volatile organic compounds.
- No contaminated blast debris in habitats: Because the steel is not painted, no periodic maintenance blasting is required.
- Cost savings of 10 percent or more initially and even more over the life of the structure: No painting and steel’s durability mean reduced costs.
- Long life and high performance: Weathering Steel has been used on bridges for many decades and performs well in most environments.
“Weathering” means that due to their chemical compositions, these steels exhibit increased resistance to atmospheric
corrosion compared to other steels. This is because the steel forms a protective layer on its surface under the influence
of the weather.
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.