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Wolfram
Wolfram materiale
|
Grade |
W-1 |
W-2 |
W-3 |
W-4 |
|
|
The impurity Content is not more than % |
Pb | -- | -- | -- | 0.001 |
| Bi | -- | -- | -- | 0.001 | |
| Sn | -- | -- | -- | 0.001 | |
| Sb | -- | -- | -- | 0.001 | |
| As | -- | -- | -- | 0.002 | |
| Fe | 0.005 | 0.005 | 0.010 | 0.05 | |
| Ni | 0.003 | 0.003 | 0.005 | 0.30 | |
| Al | 0.002 | 0.002 | 0.005 | 0.005 | |
| Si | 0.003 | 0.003 | 0.010 | 0.010 | |
| Ca | 0.003 | 0.003 | 0.005 | 0.005 | |
| Mg | 0.002 | 0.002 | 0.005 | 0.010 | |
| Mo | 0.010 | 0.010 | 0.20 | 0.20 | |
| P | 0.001 | 0.001 | 0.002 | 0.005 | |
| C | 0.005 | 0.008 | 0.010 | 0.010 | |
| O | 0.003 | 0.003 | 0.005 | 0.010 | |
| N | 0.003 | 0.003 | -- | -- | |