| Standard |
ASTM A606-4 |
ASTM A588 Grade A |
| Type |
High-strength low-alloy steel |
Weathering steel |
| Corrosion Resistance |
Good |
Excellent; resistant to atmospheric corrosion |
| Tensile Strength |
Min 70 ksi (485 MPa) |
Min 70 ksi (485 MPa) |
| Yield Strength |
Min 50 ksi (345 MPa) |
Min 50 ksi (345 MPa) |
| Elongation |
Varies by thickness |
Varies by thickness |
| Thickness Range |
Typically up to 2 inches (50 mm) |
Typically up to 2 inches (50 mm) |
| Formability |
Good |
Good |
| Weldability |
Good with appropriate precautions |
Good with appropriate precautions |
| Applications |
Construction, bridges, structural supports |
Bridges, construction, marine applications |
| Surface Finish |
Mill finish or as specified |
Mill finish or as specified |
| Chemical Composition |
Varies slightly based on specific requirements |
Contains elements like copper for enhanced weathering resistance |