Corten Steel Roll Forming Material Guide: Weathering Steel Properties & Coil Sizes

Corten Steel Roll Forming Material

1. Overview of Corten Steel in Roll Forming

Corten steel, also known as weathering steel, is a high-strength material designed to form a stable rust-like protective layer when exposed to the atmosphere. This layer eliminates the need for painting while providing long-term corrosion resistance.

In roll forming, corten steel is widely used for architectural cladding, roofing panels, façades, bridges, containers, and outdoor structures.

Compared to galvanized or painted steel, corten offers a natural, aesthetic finish with reduced maintenance requirements.

2. Material Composition & Structure

Corten steel consists of:

Iron base metal
Copper (for corrosion resistance)
Chromium
Nickel
Phosphorus

Structure

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

Common Grades

Corten A
Corten B
ASTM A588
ASTM A242

3. Available Coil Specifications

Thickness Range

0.5mm – 4.0mm

Coil Width

600mm – 1500mm

Coil Weight

3 tons – 10 tons

Coil ID / OD

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

Tolerance

Good flatness
Consistent thickness

4. Mechanical Properties

Typical values:

Yield Strength: 345 – 500 MPa
Tensile Strength: 480 – 630 MPa
Elongation: 18% – 25%
Hardness: 120 – 200 HB

5. Coating Types

Corten steel is typically:

Supplied uncoated (to allow patina formation)
Pre-weathered (pre-patinated)
Occasionally sealed with protective coatings

6. Surface Finishes

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

7. Common Roll Forming Applications

Architectural wall cladding
Roofing panels
Façade systems
Bridge components
Shipping containers
Outdoor structures and sculptures

8. Advantages of Corten Steel

Excellent corrosion resistance
No painting required
Unique aesthetic appearance
Long lifespan
Low maintenance
High strength

9. Disadvantages / Limitations

Initial rust runoff (can stain surfaces)
Not suitable for marine or high humidity environments
Higher cost than standard steel
Color variation over time
Requires proper drainage design

10. Roll Forming Machine Considerations

Roll Tooling

Standard hardened rollers suitable

Speed

10–30 m/min

Lubrication

Optional

Cutting

Hydraulic or flying shear

Common Issues

Surface marking
Handling damage
Oxidation inconsistency

11. Common Problems in Production

Surface scratches affecting final appearance
Uneven patina development
Edge cracking if improperly formed
Staining during early oxidation
Handling damage during production

12. Pricing Guide

Typical global pricing:

Low: $900–$1200 per ton
Medium: $1200–$1600 per ton
High: $1600–$2200+ per ton

Factors affecting price:

Grade
Thickness
Pre-weathering process
Supplier

13. Comparison with Other Materials

Corten vs Galvanized Steel

Corten = natural protection
Galvanized = zinc coating

Corten vs Painted Steel

Corten = no repainting
Painted = requires maintenance

Corten vs Stainless Steel

Corten = cheaper
Stainless = better corrosion resistance in harsh environments

14. Best Industries Using Corten Steel

Architecture and design
Construction
Infrastructure
Landscaping
Industrial fabrication

15. How to Choose Corten Steel

Choose Corten Steel When:

Outdoor exposure required
Architectural aesthetics important
Low maintenance desired
Long lifespan needed

Avoid When:

Marine or coastal environments
Constant moisture exposure
Staining is a concern

16. FAQ Section

What is corten steel?

A weathering steel that forms a protective rust layer.

Does corten steel rust?

Yes, but the rust protects the material.

Is corten steel good for roofing?

Yes, widely used in architectural roofing.

Does it need painting?

No, it is designed to be uncoated.

Can corten steel be roll formed?

Yes, commonly used in roll forming.

17. Machine Matcher Section

We supply roll forming machines for all material types including corten 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