ASTM A588 Grade A steel is a high-strength, low-alloy weathering steel designed for superior atmospheric corrosion resistance. Over time, the steel develops a protective rust-colored patina that reduces maintenance costs and eliminates the need for painting.
It is ideal for outdoor and structural applications such as bridges, buildings, sculptures, and industrial structures.
Key Features
High yield and tensile strength (50 ksi minimum yield, 70 ksi minimum tensile)
Excellent corrosion resistance in atmospheric conditions
Can withstand high temperatures and harsh environments
Good weldability, machinability, and formability
Available in various sizes, thicknesses, and forms (hot rolled, cold rolled, normalized, tempered)
Suitable for bare (unpainted) applications
Can be used in bridges, railcars, tanks, fencing, and many outdoor structures
International Equivalents
| Standard | Country/Region | Equivalent Grade |
|---|---|---|
| EN 10025-5 | EU | S355J0WP |
| JIS G3125 | Japan | SPA-H |
| BS 4360 | UK | WR 50 A |
| ISO 4952 | International | Fe 355 W |
Note: ASTM A588 Grade B has slightly higher copper and chromium content, providing stronger corrosion resistance.
Specifications
| Parameter | Value |
|---|---|
| Grade | ASTM A588 Gr A |
| Standard | ASTM A588 / ASME SA588 |
| Width | 750 mm – 1500 mm |
| Length | Up to 12,000 mm |
| Thickness | 0.8 mm – 50 mm |
| Type | Weathering / Corten Steel |
| Process | Hot Rolled (HR) |
Chemical Composition (Grade A)
| Element | C % | Si % | Mn % | P % | S % | Cr % | V % | Ni % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| A588 Gr A | 0.19 | 0.30–0.65 | 0.80–1.25 | 0.04 | 0.05 | 0.40–0.65 | 0.02–0.10 | 0.40 | 0.25–0.50 |
Mechanical Properties
| Thickness | Yield Strength (ReH) | Tensile Strength (Rm) | Elongation 2" | Elongation 8" |
|---|---|---|---|---|
| 0.188–2.00 in | 50 ksi (345 MPa) | 70 ksi (483 MPa) | 21% | 18% |
Applications
ASTM A588 Gr A Corten Steel Plates & Sheets are widely used in industries requiring durable and weather-resistant steel, including:
Bridges and pedestrian overpasses
Railcars, containers, and cranes
Tanks and storage vessels
Fencing and outdoor architectural structures
Sculptures and public art installations
Industrial and chemical plants
Testing & Quality Assurance
All A588 Grade A plates undergo destructive and non-destructive tests including:
Charpy V-Notch Impact Test
Ultrasonic Examination
Hydrostatic Analysis
Reduction of Area Measurement
Simulated Post-Weld Heat Treatment
X-ray and Spectro Chemical Analysis
These ensure consistent quality, toughness, and reliability for all structural applications.
