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Weather Resistant Steel Plate

Weathering Steel Plates for External Structures

Brown McFarlane provides a comprehensive selection of weathering steel plates specifically engineered for use in external structures. These plates are designed to resist atmospheric corrosion, offering exceptional durability and reducing the need for ongoing maintenance or additional surface treatments. This innovative solution combines long term resilience with aesthetic appeal, ensuring reliable performance and visual quality for a wide range of applications.

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Weather Resistant Steel Plate

Weathering steel has become a preferred material for architects, engineers, and builders due to its unique properties and versatility. Its capability to form a protective patina over time not only enhances its longevity but also provides a distinctive, rustic appearance that complements various designs and environments.

Ranging from 1mm thick to 100mm and in lengths of up to 12000mm (other sizes available upon request)
We specify our plate to EN10025 specifications as well as, CE Marked and 3.1 certified, therefore meeting the strict requirements of structural and bridge fabricators.
Wide range of grades available including: S355J2W, S355J2W+N, S355K2W, S355K2W+N, S355J5W+N, and S355J0WP+AR
The steel weldability is aided by an enhanced CEV restriction.
Restricted Sulphur enables us to prove the through thickness properties to EN10164 Z35.

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What is Weathering Steel?

Weathering steel, also known as CorTen Steel, has properties inhibiting atmospheric corrosion. When placed in suitable environments, surface treatment of steel is not needed as the “rust” extends the life cycle of the structure and creates a protective layer against the elements.The use of weather resistant steels has predominantly been seen in the structural engineering sector, with the steel being popular in bridge work applications. More recently, we have seen this material used in Intermodal Containers, Sheet Piling and Rail Wagons to name a few.

There has been an increase in the use of Weathering Steel Plate as an aesthetic material in both construction and design work. “The Angel of the North” remains the most recognisable exemplar of this genre, but smaller and more intimate public works of art are appearing across our townscapes with increasing regularity. This is due to the materials minimal maintenance demands and its subtle colour changes over time.

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Weather Steel Grades We Stock

S355J2W

S355J2W is a weather-resistant structural steel with excellent atmospheric corrosion resistance and toughness. The “J2” indicates good impact performance at -20°C.

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S355J2W+N

S355J2W+N is the normalised version of S355J2W. The +N denotes that the steel has been normalised to improve structural integrity, mechanical performance, and toughness.

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S355K2W

S355K2W is a high toughness weathering steel designed for critical structures. The “K2” designation ensures impact toughness at -20°C with higher notch toughness than J2 grades.

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S355K2W+N

This version of S355K2W is supplied in the normalised condition for improved performance in demanding structural applications. The enhanced ductility and toughness make it a preferred choice in safety-critical environments.

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S355J5W+N

S355J5W+N offers even higher impact resistance than S355J2W and is ideal for harsh environments and load-bearing applications.

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S355J0WP+AR

S355J0WP+AR is a hot-rolled weathering steel supplied in the “as rolled” condition. It’s commonly used in lighter structures where corrosion resistance and aesthetic patina development are priorities.

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Why Choose Weathering Steel From Brown McFarlane?

Unlike traditional carbon steels, weathering steel does not require painting or protective coatings in appropriate environments. Thanks to its ability to develop a stable rust-like appearance after exposure to the elements, effectively creating a self protecting surface.

- Superior Weather Resistance
Forms a protective rust-like layer to prevent future corrosion, making it ideal for exposure to the elements.
- Cost-Effective Solution
No painting or regular maintenance needed, significantly reducing lifecycle costs.
- Environmentally Friendly
Produced using less energy and fully recyclable, weathering steel is a sustainable choice for conscientious developers.
- Aesthetic Appeal
Its natural patina changes subtly over time, making it a popular option for architectural and artistic applications.
- Versatility Across Applications
From structural bridges to outdoor sculptures, weathering steel’s adaptability suits diverse project needs.
Weathering Steel Specifications
At Brown McFarlane, not only do we stock a range of grades to meet your requirements, we are also able to provide plates in a range of thickness and lengths. Plus, thanks to our comprehensive range of in-house plate cutting and plate processing services, we are able to offer bespoke dimensions to suit your project.
- Thicknesses: From 1mm to 100mm
- Lengths: Up to 12,000mm (other sizes available on request)
- Certification: CE Marked and supplied with 3.1 certification
- Specifications: EN10025
- Durability: Low sulphur content enables compliance with EN10164 Z35 for through-thickness properties
Certified Standards

With decades of experience, Brown McFarlane is a global leader in steel distribution. Our partnerships with leading European plate mills ensure rapid delivery and consistent quality. Plus, our ISO 9001, ISO 14001, and ISO 45001 Certified Standards reflect our strict commitment to safety, quality and sustainability.