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Duplex 2205 (UNS S32205, W.Nr. 1.4462) delivers 620 MPa tensile strength with a PREN of 34–36, providing excellent chloride resistance at 40–60% lower cost than nickel alloys. Super Duplex 2507 (UNS S32750, W.Nr. 1.4410) achieves 800 MPa tensile strength with PREN ≥42.5, meeting the critical >40 threshold required for deep-sea and aggressive chloride environments. Both share a 300°C maximum service temperature due to embrittlement risk.
| Property | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| UNS | S32205 (S31803) | S32750 |
| W.Nr. | 1.4462 | 1.4410 |
| Tensile Strength | 620 MPa (90 ksi) min. | 800 MPa (116 ksi) min. |
| Yield Strength | 448 MPa (65 ksi) min. | 550 MPa (80 ksi) min. |
| Elongation | 25% min. | 15% min. |
| Max Service Temperature | 300°C (570°F) | 300°C (570°F) |
| Density | 7.88 g/cm³ | 7.81 g/cm³ |
| PREN | 34–36 | ≥42.5 |
| Cr / Mo / N Content | 22% Cr, 3% Mo, 0.17% N | 25% Cr, 4% Mo, 0.27% N |
| Microstructure | ~50/50 austenite/ferrite | ~50/50 austenite/ferrite |
Moderate chloride environments are involved and cost-performance ratio matters. The workhorse duplex grade for chemical piping, heat exchangers, structural marine applications, and water treatment. At 40–60% less cost than Inconel 625 for equivalent fastener sizes.
Aggressive chloride environments require PREN > 40 by specification, such as deep-sea subsea applications, desalination plants, and high-stress subsea structures. More expensive than 2205 but still substantially cheaper than full nickel alloys like Inconel or Hastelloy.
Our metallurgical specialists help you select the right alloy for your application. Contact us for a free technical consultation and quote.