Weathering Steel Roll Forming Material Guide: Properties, Coil Sizes & Applications

Weathering Steel Roll Forming Material

1. Overview of Weathering Steel in Roll Forming

Weathering steel is a group of alloy steels designed to develop a protective oxide layer (patina) when exposed to the atmosphere. This layer reduces corrosion and eliminates the need for painting in many applications.

In roll forming, weathering steel is used for cladding panels, roofing systems, structural sections, bridges, containers, and outdoor architectural components.

While “Corten” is a well-known brand name, weathering steel refers to the broader category of similar materials.

2. Material Composition & Structure

Weathering steel typically includes:

Iron base metal
Copper
Chromium
Nickel
Phosphorus

Structure

Alloyed steel for atmospheric corrosion resistance
Forms stable oxide (patina) layer
Self-protecting surface over time

Common Grades

ASTM A588
ASTM A242
EN 10025 S355J2W
Corten A / B

3. Available Coil Specifications

Thickness Range

0.5mm – 4.0mm

Coil Width

600mm – 1500mm

Coil Weight

3 tons – 12 tons

Coil ID / OD

ID: 508mm / 610mm
OD: up to 1600mm

Tolerance

Good flatness
Stable thickness control

4. Mechanical Properties

Typical values:

Yield Strength: 345 – 500 MPa
Tensile Strength: 480 – 650 MPa
Elongation: 18% – 25%
Hardness: 120 – 200 HB

5. Coating Types

Weathering steel is typically:

Supplied uncoated
Pre-weathered (pre-patinated)
Occasionally sealed for aesthetic control

6. Surface Finishes

Mill finish
Pre-weathered finish
Natural patina (develops over time)

7. Common Roll Forming Applications

Roofing panels
Wall cladding systems
Architectural façades
Bridges and infrastructure
Shipping containers
Outdoor structures

8. Advantages of Weathering Steel

Long-term corrosion resistance
No need for painting
Reduced maintenance costs
Unique natural appearance
High structural strength
Environmentally efficient

9. Disadvantages / Limitations

Rust runoff during early stages
Not suitable for marine environments
Requires proper drainage design
Color variation over time
Higher cost than standard steel

10. Roll Forming Machine Considerations

Roll Tooling

Standard hardened rollers

Speed

10–30 m/min

Lubrication

Optional

Cutting

Hydraulic or flying shear

Common Issues

Surface scratching
Handling marks
Inconsistent patina development

11. Common Problems in Production

Surface damage affecting appearance
Uneven oxidation after installation
Edge cracking in tight profiles
Staining of surrounding materials
Handling-related defects

12. Pricing Guide

Typical global pricing:

Low: $900–$1200 per ton
Medium: $1200–$1700 per ton
High: $1700–$2300+ per ton

Factors affecting price:

Grade
Thickness
Pre-weathered processing
Supplier and origin

13. Comparison with Other Materials

Weathering Steel vs Galvanized Steel

Weathering = natural corrosion protection
Galvanized = zinc coating protection

Weathering Steel vs Painted Steel

Weathering = no repainting
Painted = requires maintenance

Weathering Steel vs Stainless Steel

Weathering = lower cost
Stainless = superior corrosion resistance

14. Best Industries Using Weathering Steel

Architecture and design
Infrastructure and bridges
Construction
Landscaping
Industrial fabrication

15. How to Choose Weathering Steel

Choose Weathering Steel When:

Outdoor exposure required
Maintenance needs to be minimized
Architectural aesthetics important
Long-term durability needed

Avoid When:

Coastal or marine environments
Constant moisture conditions
Clean appearance required

16. FAQ Section

What is weathering steel?

A steel that forms a protective rust layer.

Is weathering steel the same as corten?

Corten is a type of weathering steel.

Does weathering steel need coating?

No, it is designed to be uncoated.

Can it be roll formed?

Yes, commonly used in roll forming.

Does it stain surfaces?

Yes, during early oxidation stages.

17. Machine Matcher Section

We supply roll forming machines for all material types including weathering steel.

Custom-built machines to your profile
New machines built to specification
Global delivery available
UK and USA technical support

Contact:
Machine Matcher
Sales & Technical Team

Quick Specs

Thickness
0.5–4.0mm

Yield Strength
345–500 MPa

Coil Width
600–1500mm

Coil ID
508 / 610mm