Key Specifications of ASTM A588 Grade A
1. Chemical Composition (%)
| Element | C (max) | Mn | P | S (max) | Cu (min) | Si | Cr | Ni | V |
|---|---|---|---|---|---|---|---|---|---|
| Range | 0.19 | 0.80-1.25 | 0.04 | 0.05 | 0.25-0.40 | 0.15-0.30 | 0.40-0.65 | ≤0.50 | ≤0.02-0.10 |
Copper (Cu), Chromium (Cr), and Nickel (Ni) enhance corrosion resistance.
Phosphorus (P) is controlled to avoid brittleness.
Vanadium (V) may be added for grain refinement.
2. Mechanical Properties
| Thickness (mm) | Yield Strength (MPa, min) | Tensile Strength (MPa) | Elongation (% min) |
|---|---|---|---|
| ≤50 mm | 345 | 485 | 18 |
| >50–100 mm | 315 | 485 | 18 |
High strength-to-weight ratio (comparable to S355J0WP).
Good weldability (preheat if thickness > 25mm).
3. Corrosion Resistance
4–6× better than carbon steel in rural/industrial atmospheres.
Patina formation: Develops a dark brown protective layer over time.
4. Impact Toughness
Charpy V-notch test: Typically meets 20 J at -20°C.
