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 that is best suited for heavy, load-bearing structures.

Speaking of Corten Steel, specialized Corten Steel is used for proper functioning. Cortensteeltube.com Is one leading Manufacturers, Supplier & Stockist Of Corten Steel Grade A Plate & Sheet.

Corten steel

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

Rust is able to penetrate deeper into the metal. Steel beneath the patina is protected, ensuring its strength.

What is Weathering Steel

Unlike most low alloy steels, Corten A and Corten B are corrosion-resistant. When this steel grade comes in contact with moisture, it does not rust. 

As a corrosion-resistant, protective barrier, Corten A and Corten B steel form a stable rust layer called a ‘patina’. Unlike standard steel which detaches from its surface and allows rust to penetrate deeper into the metal, this rust layer protects the steel beneath, ensuring it remains strong. 

Key Features of Corten (or Cor-ten) Steel

All Corten grades are weather-resistant, copper chromium alloy steels. Corten A and Corten B are both aesthetically pleasing and have been used in a variety of architectural applications, including sculptures and bridges, due to their high resistance to atmospheric weathering.

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. In addition to aesthetic fascias, it is also commonly used for applications that carry heavy loads.


  • High durability
  • Lightweight
  • Corrosion resistance
  • Uniform construction
  • Strength
  • Toughness


Corten A plate steel is mainly used in container manufacturing, rolling stock, oil rigs, harbor construction, oil platforms, and other structural parts affected by hydrogen sulfide corrosion in petrochemical equipment.

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.


  • Higher weather resistance than normal grades
  • Minimum yield strength 50 KSI


  • Architecture
  • Sculpture
  • Structural works
  • Industrial chimneys
  • Freight wagons
  • Silos
  • Containers
  • Pylons

Corten A VS Corten B steel in chemical composition:

Grade C Si Mn P S Al V Cu Cr Ni
Corten A 0.12 0.25/0.75 0.20/0.50 0.07/0.15 0.030 0.015/0.060 0.25/0.55 0.50/1.25 0.65
Corten B 0.16 0.30/0. 50 0.80/1.25 0.030 0.030 0.020/0.060 0.02/0.10 0.25/0.40 0.40/0.65 0.40

Corten A VS Corten B steel in mechanical properties:

Grade Yield Strength

Rel N/mm²


Tensile Strength

Rm N/mm²



A50 %


Corten A 355 470-630 20
Corten B 345 470-630 20


Cortensteeltube.com is a leading supplier, stockist, manufacturer & exporter of Corten Steel. Get in touch with us for the best rates & availability Of Corten Steel Grade A Plate & Sheet.