Corten B Steel Description
ASTM Corten B steel grade is a hot rolled products of structural steels in technical delivery conditions with improved atmospheric corrosion resistance.
The steel grade Corten B is according to ASTM standard which with the yield strength of 355MPa and 345MPa which is based on the different thickness.
The anti-corrosive properties of Corten B steel are better than those of other structural steels in many applications. Corten B steel is self-protecting.
The rust layer on the surface becomes a tight oxide layer that slows down the progress of corrosion. Corten B steel is an economical, long-lasting and fully recyclable material.
Corten B Steel Delivery state
Hot Rolled, Cold Rolled, Normalized, Quenched, Tempering, Thermal Mechanical Control Process (TMCP), Electroslag Remelting Technical, HIC test.
Corten B Steel Application
ASTM CortenB is used for various types of welded, bolted and riveted constructions e.g. steel frame structures, building cladding, metal sculptures (Angel of the North), chimneys, bridges, tanks and containers, exhaust systems, vehicles and equipment constructions.
As it ages it takes on a orange/brown appearance dependent on the salt level of the atmosphere, over time it forms a protective layer or skin against the elements. It was originally developed to eliminate the requirement of painting surface finishes
In most circumstances, CortenB steel plate and sheet for steel atmospheric corrosion resistance is better than carbon structural steel plate and sheet containing copper or not in essence.
When fully exposed to the atmosphere, Corten B can be widely used in many cases under bare (uncoated) condition
ASTM Corten B steel chemical composition by [%]
| Grades | C max |
Si | Mn. | P | S max |
Cr | Ni | Cu | V |
| Corten B |
0.16 | 0.30-0.50 | 0.80-1.25 | 0.030 | 0.030 | 0.40-0.65 | 0.40 | 0.25-0.40 | 0.02- 0.10 |
In order to obtain fine grain structure a sufficient amount of nitrogen absorbing elements is added (e.g. ≥0.02% Al)
ASTM CortenB steel Mechanical properties
| Grade |
Thickness (mm) |
Yield Strength MPa(min) |
Tensile Strength MPa | Elongation % (min) |
| Corten B |
≤16 | 355 | 470-630 |
20 |
| >16≤50 | 345 |
1 Mpa = 1N/mm2 The impact energy is determined on ISO-V longitudinal test specimens at a temperature of - 20°C as an average of three tests.
For product thicknesses ≥10mm the average value is at least 27 J. For thicknesses between 10mm and 6mm, the minimum impact value is reduced proportionally to the specimen width (product thickness).
About US
Gnee has grown over the past decade into an integrated steel company combining R&D, manufacturing, and global trade. We uphold the principles of "quality first, integrity foremost," committed to bringing China-made premium steel to markets worldwide.
Responding to diverse demands, Gnee continuously optimizes its supply chain and technical capabilities to offer customized services and flexible delivery solutions.
Whether it's complex architectural facades or intricate landscape accessories, Gnee supports clients with professionalism and rigorous standards to perfectly blend creativity and functionality.
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