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.
The technical specifications of Corten A are outlined below.
Corten A - Grades and Equivalents
The grades and equivalents of Corten A are provided in the table below.
Corten | EN 10025-5:2004 |
Corten A | S355 J0WP |
Corten A - Chemical Composition
The chemical composition of Corten A is given in the following table.
Element | % by mass | Element | % by mass |
C | 0.12 | Al | 0.015/0.06 |
Si | 0.25/0.75 | V | – |
Mn | 0.20/0.50 | Cu | 0.25/0.55 |
P | 0.07/0.15 | Cr | 0.50/1.25 |
S | 0.030 | Ni | 0.65 |
Maximum values unless otherwise stated
Corten A - 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 |
The mechanical properties of Corten A are outlined in the following table.