Weathering Steel Plate—commonly known as Corten Steel—is designed to resist atmospheric corrosion through the formation of a stable, protective oxide layer. This natural patina eliminates the need for painting and provides long‑term durability in outdoor environments.
Weathering steel offers:
Superior resistance to atmospheric corrosion
Long service life with minimal maintenance
Excellent weldability and formability
Aesthetic rust‑brown appearance for architectural use
It is widely used in bridges, architectural façades, outdoor sculptures, containers, railway vehicles, and industrial outdoor equipment.
🟪 Product Specifications
Thickness: 2 – 200 mm
Width: 1500 – 3000 mm
Length: Custom lengths available
Delivery Conditions:
Hot Rolled
Normalized
Weathering‑Grade Heat Treatment
🟪 Key Features
Excellent atmospheric corrosion resistance
Self‑protecting rust layer reduces maintenance
High strength and good toughness
Good weldability and formability
Suitable for long‑term outdoor exposure
🟪 Included Grades
ASTM / ASME
A588 (Grade A / B / C / K)
A242 (Type 1 / Type 2)
EN 10025‑5
S355J0W
S355J2W
S355K2W
JIS G3125
SPA‑H
GB / Chinese Standard
Q295NH
Q355NH
Q355GNH
🟪 Mechanical Properties (Typical)
Grade
Yield Strength
Tensile Strength
Elongation
Notes
A588 Gr A
≥345 MPa
485–620 MPa
≥20%
High atmospheric corrosion resistance
A242 Type 1
≥345 MPa
480–620 MPa
≥20%
Structural weathering steel
S355J2W
≥355 MPa
470–630 MPa
≥22%
EN weathering steel
SPA‑H
≥355 MPa
490–610 MPa
≥21%
JIS weathering steel
Q355GNH
≥355 MPa
490–630 MPa
≥20%
GB weathering steel
🟪 Chemical Composition (Typical)
Grade
C (%)
Mn (%)
Si (%)
Cr (%)
Cu (%)
Ni (%)
Notes
A588
≤0.19
0.80–1.25
0.15–0.50
0.40–0.65
0.25–0.40
≤0.40
Classic Corten steel
A242
≤0.15
0.50–1.35
0.25–0.75
0.40–0.60
0.20–0.40
≤0.50
High corrosion resistance
S355J2W
≤0.16
0.50–1.50
0.30–0.50
0.40–0.80
0.25–0.55
≤0.65
EN weathering steel
SPA‑H
≤0.12
0.20–1.60
0.25–0.75
0.30–1.25
0.20–0.60
≤0.65
JIS weathering steel
Q355GNH
≤0.12
0.50–1.60
0.20–0.65
0.40–1.20
0.20–0.60
≤0.65
GB weathering steel
🟪 Physical Properties (General)
Density: ~7.85 g/cm³
Modulus of Elasticity: ~210 GPa
Thermal Expansion Coefficient: ~11–13 × 10⁻⁶ /K
Corrosion Resistance: Very high in atmospheric environments
🟪 Applications
Bridges and structural components
Architectural façades and decorative panels
Outdoor sculptures and landscape design
Shipping containers
Railway vehicles
Industrial outdoor equipment
Weather‑resistant building panels
🟪 Why Use It
Weathering steel provides a self‑protecting, maintenance‑free solution for outdoor structures. Its stable rust layer significantly reduces corrosion rates, extending service life and lowering lifecycle costs.
🟪 Why Choose WelSteels
Full range of global weathering steel grades
ASTM / EN / JIS / GB certified materials
Precision cutting, bending, and fabrication services
