X10CrMoVNb9-1
1.4903High-chromium creep-resistant martensitic steel equivalent to ASTM Grade 91 (P91/T91/F91). V and Nb additions with controlled N provide exceptional creep rupture strength at temperatures up to 580°C. The foundation steel of modern ultra-supercritical (USC) power plants worldwide. Used for main steam pipes, boiler headers, superheater tubes, and high-temperature pressure components in fossil and nuclear power generation.
Chemical composition comparison (wt%)
Side-by-side: X10CrMoVNb9-1 (EN) (EN 10216-2) vs ASTM
| Element | X10CrMoVNb9-1 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 0.08–0.12% | — | — |
| Si | 0.2–0.5% | — | — |
| Mn | 0.3–0.6% | — | — |
| P | ≤ 0.02% | — | — |
| S | ≤ 0.01% | — | — |
| Cr | 8–9.5% | — | — |
| Mo | 0.85–1.05% | — | — |
| V | 0.18–0.25% | — | — |
| Nb | 0.06–0.1% | — | — |
| N | 0.03–0.07% | — | — |
Mechanical properties
Normalized Tempered
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 585–780 | MPa |
| Yield Strength | ≥ 415 | MPa |
| Elongation | ≥ 20 | % |
| 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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