X2CrNiMoN25-7-4
1.4410Super duplex stainless steel (SAF 2507 / UNS S32750) with 25% Cr, 7% Ni, 4% Mo, and high N for PREN ≥42. The highest corrosion resistance and strength among standard duplex grades — YS ≥550 MPa is ~2.5× that of 316L. Service temperature up to 300°C. Used for subsea oil & gas equipment (manifolds, trees, risers), desalination plants, flue gas cleaning, chemical tankers, and mining equipment in severe chloride environments. Requires careful welding to avoid sigma phase.
Chemical composition comparison (wt%)
Side-by-side: X2CrNiMoN25-7-4 (EN) (EN 10088-2) vs ASTM
| Element | X2CrNiMoN25-7-4 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.03% | — | — |
| Si | ≤ 0.8% | — | — |
| Mn | ≤ 1.2% | — | — |
| P | ≤ 0.035% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 24–26% | — | — |
| Mo | 3–5% | — | — |
| Ni | 6–8% | — | — |
| Cu | ≤ 0.5% | — | — |
| N | 0.24–0.32% | — | — |
Mechanical properties
Solution Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 800–1000 | MPa |
| Yield Strength | ≥ 550 | MPa |
| Elongation | ≥ 15 | % |
| Hardness HB | ≤ 310 | HB |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 7.8 | g/cm3 |
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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