| Items | Fe | Cr | Si | O | C |
| P 1 | 5.5 | 15.5 | ≈0 | ≈0 | 79.0 |
| P 2 | 60.4 | ≈0 | 1.6 | ≈0 | 38.0 |
| P 3 | 5.8 | 12.6 | ≈0 | ≈0 | 81.6 |
| P 4 | 65.0 | ≈0 | ≈0 | ≈0 | 35.0 |