.jpg "Corten steel resistant to atmospheric corrosion")
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Corten steel (often referred to as Cor-Ten) is a weather resistant steel which could more accurately be referred to as “atmospheric corrosion resistant steel”.
It is a steel alloyed with copper and chromium – this alloy has a higher level of resistance to atmospheric weathering compared to other unalloyed steels. Its chemical composition promotes the early formation of an adherent protective layer of rust when exposed to the elements.
Corten steel applications
Aesthetically pleasing to the eye, this finish has become popular with many high profile architects and has been specified and used in a variety of applications including building fascia, architectural sculpture, and bridges. Examples of Corten structures include …
- The Angel of the North (United Kingdom)
- Matsunoyama Museum of Natural Sciences (Japan)
- The Contemporary Art Center (Australia)
The protective layer constantly grows and regenerates over time, reacting to pollutants in the atmosphere. Consideration should be given to the thicknesses used, especially when the material is used for structural purposes rather than just cosmetic.
The advantages of such a steel are immediately obvious: a self-protecting steel is economical, durable and easily recyclable. Masteel is a reseller of Corten-B and Corten-A.
Corten levels and equivalents
The grades and equivalents of Corten steel are provided in the following table.
| Corten | EN 10025-5: 2004 |
| Corten A | S355 J0WP |
| Corten B | S355 J0W and S355 J2W |
Mechanical properties and thickness ranges for Corten
The mechanical properties and thickness ranges of Corten steel are provided in the following table.
| Thickness (mm) Band products |
Plate products | Elasticity limit minimum |
Tensile strength minimum |
Elongation minimum |
|
| Corten A | 2 – 12 | 6 – 12 | 345 | 485 | 20 |
| Corten B | 2 – 13 | 6 – 40 | 345 | 485 | 19 |
Chemical composition of Corten steel
The chemical composition of Corten steel is shown in the following table.
| Content,% (pocket analysis) | ||||||||||
| VS (max) |
Yes | Mn | P | S (max) |
Al | V | Cu | Cr | Or (max) |
|
| Corten A | 0.12 | 0.25-0.75 | 0.20–0.50 | 0.07-0.15 | 0.030 | 0.015–0.06 | – | 0.25–0.55 | 0.50-1.25 | 0.65 |
| Corten B | 0.19 | 0.30-0.65 | 0.80-1.25 | 0.035 max. | 0.030 | 0.020–0.06 | 0.02–0.10 | 0.25-0.40 | 0.40-0.65 | 0.40 |
Example of corrosion tolerances for untreated Corten B
Examples of corrosion tolerances for untreated Corten B steel are provided in the following table.
| Type of atmosphere | Corrosion allowance to be added for one side of the nominal thickness for each 10-year service life |
|
| First 10-year period mm | Each period of the following year mm | |
| Rural | 0.10 | 0.05 |
| Urban* | 0.20 | 0.05 |
| Industrial** | 0.20 | 0.10 |
| * The main impurity in the air is sulfur dioxide | ||
| ** In addition to sulfur dioxide, air also contains chlorine. Also for locations in the immediate vicinity of salt water | ||
Formability of Corten steel
The formability of Corten steel is shown in the following table.
| Thickness (mm) | ||||||||||||
| (2) –3 | (3) –4 | (4) -5 | (5) -6 | (6) –7 | (7) –8 | (8) –10 | (10) –12 | (12) –14 | (14) –16 | (16) –18 | (18) –20 | |
| Smallest permissible internal bending radius mm | ||||||||||||
| Corten A | 6 | 8 | ten | 12 | 21 | 24 | 30 | 36 | 42 | – | – | – |
| Corten B | 6 | 8 | ten | 12 | 21 | 24 | 30 | 36 | 42 | 48 | 54 | 60 |
| Values ​​apply to all forming directions | ||||||||||||
Heat treatment of corten steel
The methods of heat treatment of Corten steel are provided in the following table
| Heat treatment | Temperature ° C | Processing time Cooling mode |
| Stressful | 500–600 (target 580) |
2 minutes / millimeter of thickness, minimum 30 minutes Slow cooling in the oven |
| Normalize | 860-940 (target 910) |
1 minute / millimeter of thickness, minimum 15 minutes Free cooling in air atmosphere outside the oven |
This information has been obtained, reviewed and adapted from documents provided by Masteel UK Ltd.
For more information on this source, please visit Masteel UK Ltd.
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