What is the difference between Corten A and Corten B?

A type of weather resistant steel created by alloying copper, chromium, and nickel is corten A. Corten A also contains phosphorus, making it ideal for applications such as gas flues and exterior fascias. The material is not recommended for heavy load bearing applications. Corten B is a kind of weather-resistant steel which is best suited for heavy, load-bearing structures.

What is Corten Steel The greatest advantage of Corten A and Corten B is their corrosion resistance. Unlike most low alloy steels on the market, this steel grade does not rust when exposed to moisture. Corten A and Corten B steels form a corrosion-resistant, protective layer known as a 'patina'. Rust on this steel is unlike that on standard steel, which does not detach from the surface

Corten A Weathering Steel Corten A alloys copper, nickel, and chromium with phosphorus. Corten A's blend of materials makes it well-suited for gas flue applications.  Features – High durability – Light weight – Corrosion resistance – Uniform construction – Strength – Toughness

Corten B Weathering Steel Corten B has a similar composition to Corten A and is used for many structures due to its corrosion resistance. It is, however, much better suited for load-bearing structures than Corten A Features – Higher weather resistance than normal grades – Minimum yield strength 50 KSI