| Element |
|
| Grade |
|
|
| Very-Low | Low | Middle (Suitable) | High | Very-High | |
| B | <0.15 | 0.15 - 0.3 | 0.3 - 0.6 | 0.6 - 1.0 | ≥1.0 |
| Cu | <0.2 | 0.2 - 0.5 | 0.5 - 1.0 | 1.0 - 3.0 | ≥3.0 |
| Fe | <2.5 | 2.5 - 4.5 | 4.5 - 10 | 10 - 60 | ≥60 |
| Mn | <5 | 5 - 10 | 10 - 20 | 20 - 40 | ≥40 |
| Mo | <0.1 | 0.1 - 0.15 | 0.15 - 0.2 | 0.2 - 0.3 | ≥0.3 |
| Zn | <0.5 | 0.5 - 1.0 | 1.0 - 2.0 | 2.0 - 4.0 | ≥4.0 |