CHEMICAL COMPOSITION ANALYSIS
| Type | Minimum | maximum |
|---|---|---|
| W | 75.00% | 80.00% |
| Si | – | 1.00% |
| Mn | – | 0.50% |
| As | – | 0.10% |
| Sn | – | 0.080% |
| Cu | – | 0.20% |
| C | – | 0.50% |
| S | – | 0.080% |
| P | – | 0.060% |
| Fe | Balance | – |
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