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Corten A weather resistant steel plate

Corten A

Corten A is a weather resistant steel created by alloying copper, chromium and nickel. In addition to this, Corten A has added phosphorous which makes the material best suited for gas flue applications and for aesthetic facias The material is not recommended in heavy load bearing applications – in this case Corten B or S355J2W should be considered.

The top layer of the material reacts with atmospheric elements to form a rust coloured protective layer which not only makes the steel virtually maintenance free but also provides a pleasing and consistent finish.

In addition to the standard elements of copper, chromium, and nickel, Corten A has added phosphorus. The addition of phosphorus makes this grade of Corten steel suitable for gas flue applications and aesthetic facias.

The minimum yield strength of Corten A is 345 N/mm2 and the minimum tensile strength is 485 N/mm2. We supply them in strips with thicknesses ranging from 2 mm – 12 mm.

At first, the steel begins to rust in the same fashion as ordinary mild steel once it’s exposed to wet and dry conditions. However, as time passes, the rust layer transforms into a patina layer, and the color changes from fresh, newly developed orange-brown, to light or dark brown.

The speed of change and the final color of the steel are dependent on the atmospheric conditions of a site and the level of pollution – sulfur dense atmospheres will speed up the oxidation process and result in a darker patina. Frequent cycles of wet and dry conditions will also speed up oxidation. The entire oxidation process usually takes between 2 – 6 years.

Grades & Equivalents

CORTEN EN 10025-5:2004
Corten A S355J2W

Mechanical Properties

GRADE THICKNESS (MM)
STRIP PRODUCTS
PLATE PRODUCTS YIELD STRENGTH
REL N/MM²
MINIMUM
TENSILE STRENGTH
RM N/MM²
MINIMUM
ELONGATION
A50 %
MINIMUM
Corten A 2-12 6-12 345 485 20

Chemical Composition of Corten A

C 0.15
Si 0.25/0.75
Mn 0.20/0.50
P 0.07/0.15
S 0.030
Al 0.015/0.06
Cu 0.25/0.55
Cr 0.50/1.25
Ni 0.65

Painting and maintenance will be required if the structure is is continually wet as a protective layer will not form. An good example is where the base of the structure meets with the ground or is partially submerged.

Technical Requirements & Additional Services:

  • High tension test
  • Low temperature impacting test
  • Simulated post-welded heat treatment (PWHT)
  • Ultrasonic test under EN 10160,ASTM A435,A577,A578
  • Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
  • Shot blasting and Painting,Cutting and welding as per end user’s demands

Corten steel is a weather resistant steel that is often used in applications that are exposed to atmospheric elements as it is highly corrosion resistant. This type of steel is unique as it forms a thick layer of ‘rust’ when it comes into contact with the pollutants in the air, and this ‘rust’ provides a protective layer that prevents any further corrosion.

Painting and maintenance will be required if the structure is is continually wet as a protective layer will not form. An good example is where the base of the structure meets with the ground or is partially submerged.

sunnysteel

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

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