A588 Chemical Requirements
| Element % | Grade A | Grade B | Grade C |
|---|---|---|---|
| Carbon | 0.19 max | 0.20 max | 0.17 max |
| Manganese | 0.80 – 1.25 | 0.75 – 1.35 | 0.50 – 1.20 |
| Phosphorus | 0.04 max | 0.04 max | 0.04 max |
| Sulfur | 0.05 max | 0.05 max | 0.05 max |
| Silicon | 0.30 – 0.65 | 0.15 – 0.50 | 0.25 – 0.50 |
| Nickel | 0.40 max | 0.50 max | 0.40 max |
| Chromium | 0.40 – 0.65 | 0.40 – 0.70 | 0.40 – 0.70 |
| Molybdenum | - | - | 0.10 max |
| Copper | 0.25 – 0.40 | 0.20 – 0.40 | 0.30 – 0.50 |
| Vanadium | 0.02 – 0.10 | 0.01 – 0.10 | - |
| Columbium | - | - | 0.005 – 0.05 |