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| Grade | Code | UNS | Super Duplex Stainless Steel |
| 1.4410 / Super Duplex 2507 | X2CrNiMoN25-7-4 | S32750 |
1.4410 / Super Duplex 2507 is a super duplex stainless steel grade with balanced ferritic and austenitic phases. Its high mechanical strength is combined with excellent resistance to pitting, crevice corrosion, and stress-corrosion cracking. It welds well under controlled procedures, but the risk of microstructural degradation makes it unsuitable for prolonged exposure to high temperatures.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | N % |
| ≤0.03 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 24.00–26.00 | 6.00–8.00 | 3.00–4.50 | 0.24–0.35 |
| Form | Rp0.2 [MPa] | Rm [MPa] | Elong. [%] | Hardness [HB] | Density [g/cm³] |
| Round Bar | ≥530 | 730–930 | ≥25 | ≤310 | 7.80 |
| Plate | ≥530 | 730–930 | ≥20 | ≤310 | 7.80 |
| Sheet | ≥550 | 750–1,000 | ≥20 | ≤310 | 7.80 |
| Pipe | ≥550 | ≥795 | ≥15 | ≤310 | 7.80 |
| Industry | Most common products |
| Oil and gas | Subsea pipelines, wellhead equipment, manifolds |
| Offshore and marine | Propeller shafts, seawater pumps, seawater piping systems |
| Desalination plants | High-pressure pipes, reverse-osmosis pumps, heat exchangers |
| Chemical and petrochemical | Process piping, pressure vessels, reactors |
| Flue-gas treatment | Scrubber units, fans, ducting systems |
| Fertilizer production | Phosphoric-acid reactors, agitator shafts, heat exchangers |
| Mining and mineral processing | Autoclaves, slurry pumps, agitators |
| Power generation | Cooling-water systems, condenser tubes, high-pressure pumps |
| Wastewater treatment | Process piping, pump shafts, valves |
1.4410 / Super Duplex 2507 requires more than the grade designation for high performance: correct solution annealing, ferrite-austenite balance, and surface cleanliness are also essential. Unremoved post-weld heat tint or carbon-steel contamination can significantly reduce corrosion resistance. Its high strength permits thinner sections, but forming and machining require more powerful, rigid equipment.
1.4410, X2CrNiMoN25-7-4, UNS S32750, ASTM/ASME S32750, ASTM A182 F53, Super Duplex 2507
| Product form | ASTM | DIN EN |
| Round Bar | ASTM A276, ASTM A479, ASTM A182 F53* | DIN EN 10088-3, DIN EN 10272 |
| Plate | ASTM A240 / ASME SA-240 | DIN EN 10088-2, DIN EN 10028-7 |
| Sheet | ASTM A240 / ASME SA-240 | DIN EN 10088-2, DIN EN 10028-7 |
| Pipe | ASTM A789, ASTM A790, ASTM A928 | DIN EN 10216-5, DIN EN 10217-7 |
* ASTM A182 F53 covers forged flanges, fittings, valve parts, and pressure-system components.
1.4501 / Super Duplex F55 / UNS S32760 – The closest alternative, providing similar mechanical strength and corrosion resistance.
254 SMO / 1.4547 / UNS S31254 – Provides similar resistance to localized corrosion, but has lower mechanical strength.
1.4462 / Duplex 2205 / UNS S32205 – More readily available, but offers lower corrosion resistance and mechanical strength than 1.4410.
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
