| Analyze Element | Concentration | STD |
| Cr | 0.06% | 0.020 |
| Mn | 0.00% | 0.008 |
| Fe | 0.27% | 0.028 |
| Ni | 0.01% | 0.002 |
| Cu | 0.00% | 0.003 |
| Zn | 0.00% | 0.002 |
| Pb | 0.00% | 0.003 |