What Is Corten Grade A?
Corten Grade A, also referred to under ASTM A242 Type 1 and commonly grouped within ASTM A588 weathering steel, is a high-strength, low-alloy structural steel renowned for its excellent resistance to atmospheric corrosion.
When exposed to outdoor conditions, Corten A forms a stable, protective oxide film-often called a patina. This patina appears as a rust-like surface but functions as a natural shield, preventing further corrosion from penetrating the material.
Because of this self-protecting characteristic, Corten A is widely used in bridges, architectural façades, building structures, landscape features, outdoor sculptures, and industrial components.
Its ability to withstand moisture, pollution, varying temperatures, and cyclic weather exposure significantly lowers maintenance requirements over its service life.
This combination of durability, reduced maintenance cost, and visually striking appearance makes Corten A popular in both structural and aesthetic design environments.
Chemical Composition of Corten A Steel Plates
| Grade / Standard | Corten A | ASTM A588 Gr.A | ASTM A242 Type 1 | IRSM 41-97 |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.12% | ≤ 0.19% | ≤ 0.15% | ≤ 0.10% |
| Manganese (Mn) | 0.20–0.50% | 0.80–1.25% | ~1.00% | 0.25–0.45% |
| Phosphorus (P) | 0.07–0.15% | ≤ 0.04% | ≤ 0.15% | 0.07–0.11% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.05% | ≤ 0.05% | ≤ 0.030% |
| Silicon (Si) | 0.25–0.75% | 0.30–0.65% | 0.25–0.40% | 0.28–0.72% |
| Nickel (Ni) | ≤ 0.65% | ≤ 0.40% | – | 0.20–0.49% |
| Chromium (Cr) | 0.50–1.25% | 0.40–0.65% | – | 0.30–0.50% |
| Copper (Cu) | 0.25–0.55% | 0.25–0.40% | ≥ 0.20% | 0.30–0.39% |
| Vanadium (V) | – | 0.02–0.10% | – | 0.050% |
Mechanical Properties of Corten A Sheets & Plates
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Corten A | 470–630 | ≥ 355 | ≥ 20% |
| ASTM A588 Gr.A | ~485 | ≥ 345 | ≥ 21% |
| ASTM A242 Type 1 | ~480 | ≥ 345 | ≥ 16% |
| IRSM 41-97 | ~480 | ≥ 340 | ≥ 21% |
Heat Treatment (Typical Recommendations)
| Process | Temperature Range |
|---|---|
| Normalizing | 860–940°C (recommended 910°C) |
| Stress Relieving | 550–600°C (recommended 580°C) |
Weight Chart (Common Plate Dimensions)
| Plate Size (mm) | Weight |
|---|---|
| 1250 × 625 × 1.5 | 9.2 kg |
| 625 × 625 × 1.5 | 4.6 kg |
| 2500 × 625 × 1.5 | 18.4 kg |
| 2500 × 1250 × 2 | 49.06 kg |
| 1250 × 1250 × 1.5 | 18.4 kg |
| 625 × 625 × 2 | 6.13 kg |
| 2500 × 1250 × 1.5 | 36.8 kg |
| 1250 × 1250 × 2 | 24.53 kg |
| 1250 × 625 × 2 | 12.27 kg |
| 2500 × 625 × 2 | 24.53 kg |
Typical Applications of Corten A Steel
| Industry | Application | Key Properties | Reason for Use |
|---|---|---|---|
| Construction | Bridges & public structures | High strength + corrosion resistance | Long service life, low maintenance |
| Architecture | Facades & sculptures | Natural patina finish | Strong aesthetic & modern design appeal |
| Transportation | Railcars & shipping containers | Structural integrity under harsh climates | Resistant to weathering and deformation |
Other uses:
Outdoor furniture and planters
Garden and landscape edging
Industrial frameworks
Wind turbine towers
Contact now to get Corten A Quote
