P92 / X10CrWMoVNb9-2
Data verifiedP92 takes the P91 recipe and swaps part of the molybdenum for 1.5–2% tungsten plus a boron addition, buying roughly 30% more creep strength again. It is the standard material for the hottest main-steam lines in 600 °C-class ultra-supercritical boilers.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.07–0.13 |
| Si | ≤0.50 |
| Mn | 0.30–0.60 |
| P | ≤0.020 |
| S | ≤0.010 |
| Cr | 8.50–9.50 |
| Mo | 0.30–0.60 |
| W | 1.50–2.00 |
| V | 0.15–0.25 |
| Nb | 0.04–0.09 |
| N | 0.03–0.07 |
| B | 0.001–0.006 |
| Ni | ≤0.40 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥440 MPa |
| Tensile strength | 620–850 MPa |
| Density | 7.85 g/cm³ |
| Creep service | Steam to ~620 °C |
Heat treatment
Normalized 1040–1080 °C and tempered 730–780 °C; PWHT after welding is mandatory, as for P91, with hardness verification.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4901 |
| aisi | ASTM A335 P92 / A213 T92 |
| gb | 10Cr9MoW2VNbBN (GB/T 5310) |
Compare side by side: P92 / X10CrWMoVNb9-2 vs P91 / X10CrMoVNb9-1
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: USC main steam and hot reheat pipework, headers, superheater outlet tubing, the highest-temperature pressure parts in new coal and CCGT plant.
Processing: Same code discipline as P91 — matching W-bearing consumables, controlled preheat and full PWHT with hardness records. Not a stock-and-go grade; it is bought against project specifications.
FAQ
- P92 vs P91 — when is P92 worth it?
- Above about 600 °C metal temperature, or where wall thickness on large-bore steam lines must come down further. Below that, P91 is cheaper and more widely stocked.
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Ask for a quotationVisit NasteelSource: EN 10216-2 / ASTM A335 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.