X10CrWMoVNb9-2 · Grade 92 · 9Cr-W-Mo-V-Nb · EN 10253-2 Type B
The highest-performance CrMo grade. Tungsten addition above P91 provides superior creep strength for ultra-supercritical and AUSC steam plant operating at 600–650°C. PWHT 750–780°C. Filler ER90S-B9M.
P92 PWHT is 750–780°C — slightly higher than P91's 745–775°C range. The tungsten addition alters the transformation kinetics. Filler must be ER90S-B9M (W-bearing variant) rather than standard ER90S-B9. Time-temperature charts and hardness results are included on every EN 10204 3.1 certificate.
P92 (Grade 92) was developed by adding 1.5–2.0% tungsten to the P91 composition (with a corresponding reduction in Mo to 0.30–0.60%). Tungsten has a larger atomic radius than molybdenum and provides stronger solid-solution hardening of the martensitic matrix at temperatures above 600°C — extending creep rupture life beyond what P91 achieves.
The practical result is that P92 allows either higher operating temperatures than P91 at the same wall thickness, or thinner-walled components at the same operating conditions. This weight and cost advantage is significant in large-diameter main steam headers where P91 wall thicknesses would be limiting. P92 is the material of choice for USC and AUSC plants targeting steam temperatures above 620°C.
| Element | Min | Max | Vs P91 |
|---|---|---|---|
| Carbon (C) | 0.07 | 0.13 | Similar |
| Chromium (Cr) | 8.50 | 9.50 | Similar |
| Molybdenum (Mo) | 0.30 | 0.60 | Reduced (P91: 0.85–1.05%) |
| Tungsten (W) | 1.50 | 2.00 | New addition (P91: none) |
| Vanadium (V) | 0.15 | 0.25 | Similar |
| Niobium (Nb) | 0.04 | 0.09 | Similar |
| Nitrogen (N) | 0.030 | 0.070 | Similar |
| Boron (B) | 0.001 | 0.006 | Added (P91: none) |
| Grade | Key Addition | Max Temp | Allowable at 600°C | Primary Use |
|---|---|---|---|---|
| P9 (1.7386) | 9Cr-1Mo only | 600°C | ~40 MPa | Legacy 9Cr service |
| P91 (1.4903) | V+Nb+N | 650°C | ~114 MPa | Supercritical power |
| P92 (1.4901) | W+B (reduced Mo) | 650°C | ~133 MPa | USC/AUSC, highest creep |
| EN designation | X10CrWMoVNb9-2 |
| Material number | 1.4901 |
| ASTM equivalent | A234 WP92 / Grade 92 |
| ASME P-Number | P-No.15E |
| Max temperature | ≤650°C (sustained) |
| PWHT | 750–780°C (mandatory) |
| Filler (GTAW) | ER90S-B9M (W-bearing) |
| Standard | EN 10253-2 Type B |
| Certificate | EN 10204 3.1 standard |
PWHT 750–780°C. Time-temperature chart + hardness on EN 10204 3.1. PMI on every P92 order. TÜV / Lloyd's 3.2 available for critical circuits.
Get QuoteDN15–DN600 and larger. Outside diameters follow the EN 10220 / EN ISO 1127 pipe series; wall thickness is matched to your connecting pipe.
| Size | OD (mm) |
|---|---|
| DN 15 | 21.3 |
| DN 20 | 26.9 |
| DN 25 | 33.7 |
| DN 32 | 42.4 |
| DN 40 | 48.3 |
| DN 50 | 60.3 |
| DN 65 | 76.1 |
| DN 80 | 88.9 |
| DN 100 | 114.3 |
| DN 125 | 139.7 |
| DN 150 | 168.3 |
| DN 200 | 219.1 |
| DN 250 | 273.0 |
| DN 300 | 323.9 |
| DN 350 | 355.6 |
| DN 400 | 406.4 |
| DN 450 | 457.0 |
| DN 500 | 508.0 |
| DN 600 | 610.0 |
P92 (X10CrWMoVNb9-2) adds tungsten to the P91 chemistry, giving higher creep strength. It is used for ultra-supercritical and advanced steam plant operating at 600–650°C.
PWHT is mandatory at 750–780°C, and the matching tungsten-bearing filler ER90S-B9M is used for GTAW. P91 filler should not be substituted.
ASTM A234 WP92 (Grade 92), ASME P-No. 15E.
Supplying an Indian boiler or ASME B16.9 project? The equivalent grade is listed on our group site ibrfittings.com: ASTM A234 WP92 fittings.
