X10CrWMoVNb9-2
1.4901Advanced creep-resistant martensitic steel equivalent to ASTM Grade 92 (P92/T92/F92). Improved version of P91 with 1.5-2.0% tungsten addition for 25-30% higher creep rupture strength. Currently the strongest commercially available steam pipe steel. Enables ultra-supercritical power plant operation up to 300 bar / 600°C. Used for main steam pipes, headers, and pressure components in the most advanced fossil power plants worldwide.
Chemical composition comparison (wt%)
Side-by-side: X10CrWMoVNb9-2 (EN) (EN 10216-2) vs ASTM
| Element | X10CrWMoVNb9-2 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 0.07–0.13% | — | — |
| Si | ≤ 0.5% | — | — |
| Mn | 0.3–0.6% | — | — |
| P | ≤ 0.02% | — | — |
| S | ≤ 0.01% | — | — |
| Cr | 8.5–9.5% | — | — |
| Mo | 0.3–0.6% | — | — |
| V | 0.15–0.25% | — | — |
| W | 1.5–2% | — | — |
| Nb | 0.04–0.09% | — | — |
| B | 0.001–0.006% | — | — |
| N | 0.03–0.07% | — | — |
Mechanical properties
Normalized Tempered
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 620–850 | MPa |
| Yield Strength | ≥ 440 | MPa |
| Elongation | ≥ 19 | % |
| Density | ≥ 7.77 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 1040–1080 °C | air | — | — |
| tempering | 730–780 °C | air | — | Min 1h tempering |
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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