ASTM A588 corten steel plate is a high-strength, low-alloy (HSLA) structural steel also referred to as weathering steel due to its superior atmospheric corrosion resistance. This steel develops a stable, protective rust-like patina when exposed to the elements, which eliminates the need for painting and reduces maintenance costs.
ASTM A588 corten steel plate chemical composition
| ASTM A588 | A588 grade A | A588 grade B | A588 grade K |
| C | ≤ 0.19 | ≤0.20 | ≤0.17 |
| Mn | 0.80-1.25 | 0.75-1.35 | 0.50-1.20 |
| P | ≤0.04 | ≤0.04 | ≤0.04 |
| S | ≤0.05 | ≤0.05 | ≤0.05 |
| Si | 0.30-0.65 | 0.15-0.50 | 0.25-0.50 |
| Ni | ≤0.40 | ≤0.50 | ≤0.40 |
| Cr | 0.40-0.65 | 0.40-0.70 | 0.40-0.70 |
| Mo | - | - | ≤0.10 |
| Cu | 0.25-0.40 | 0.20-0.40 | 0.30-0.50 |
| V | 0.02-0.10 | 0.01-0.10 | - |
| Nb | - | - | 0.005-0.50 |
ASTM A588 corten steel plate mechanical properties
| ASTM A588 | ASTM A588 corten steel plate thickness | ||
| ＜100mm | ≥100-125mm | ＞125-200 | |
| Tensile strength min MPa | 485 | 460 | 435 |
| Yield strength min MPa | 345 | 315 | 290 |
| Elongation min | 21 | 21 | 21 |
Key Properties & Features
- Corrosion Resistance: A588 steel provides substantially better atmospheric corrosion resistance compared to carbon structural steels, making it ideal for unpainted outdoor applications.
- High Strength: It offers high strength, with a minimum yield strength of 50 ksi (345 MPa) for plates 4 inches and under in thickness, allowing for the construction of lighter-weight, durable structures.
- Aesthetic Appeal: The natural, rust-like appearance is aesthetically appealing and is a popular choice for modern and rustic architectural designs and sculptures.
- Versatility: It is suitable for welding, riveting, or bolting in construction applications.
Common Applications
- Bridges and overpasses
- Buildings and architectural projects (facades, roofing)
- Highway structures and guardrails
- Utility and transmission poles
- Landscaping structures (planter boxes, retaining walls)
- Railcars and industrial containers
