| 牌号 | FW-1 | FW-2 |
|---|---|---|
| W(%) | ≥99.95 | ≥99.9 |
| Fe | ≤0.005 | ≤0.03 |
| Si | ≤0.002 | ≤0.005 |
| Ca | ≤0.002 | ≤0.004 |
| Al | ≤0.001 | ≤0.004 |
| Mn | ≤0.001 | ≤0.002 |
| Mg | ≤0.001 | ≤0.004 |
| Ni | ≤0.003 | ≤0.004 |
| Sb | ≤0.001 | ≤0.001 |
| Cr | ≤0.001 | ≤0.004 |
| As | ≤0.001 | ≤0.002 |
| Pb | ≤0.0001 | ≤0.0005 |
| Bi | ≤0.0001 | ≤0.0005 |
| Sn | ≤0.0003 | ≤0.0005 |
| Cu | ≤0.0007 | ≤0.003 |
| Mo | ≤0.005 | ≤0.010 |