WP9 (9Cr-1Mo) is the predecessor to WP91, without the vanadium and niobium additions. Higher chromium content than WP22 provides superior oxidation and sulfidation resistance at elevated temperatures....
WP9 (9Cr-1Mo) is the predecessor to WP91, without the vanadium and niobium additions. Higher chromium content than WP22 provides superior oxidation and sulfidation resistance at elevated temperatures. Used in hydrogen reforming service, sulfur recovery units, and hydrotreating where the specific 9Cr chemistry is required by older plant designs or specific process conditions.
| Property | Value |
|---|---|
| Grade | WP9 (P9) |
| ASTM / ASME | ASTM A234 WP9 |
| UNS Number | — |
| Chromium (Cr) | 8.0–10.0% |
| Nickel (Ni) | ≤0.50% |
| Molybdenum (Mo) | 0.90–1.10% |
| Temp Rating | 600°C |
| Fitting Standard | ASME B16.9 / MSS SP-43 |
| Size Range | ½" NB to 48" NB |
| Certificate | EN 10204 3.1 MTC |
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