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| Grade | Code | UNS | Super Duplex Stainless Steel |
| 1.4501 | X2CrNiMoCuWN25-7-4 | S32760 |
1.4501 is a super duplex stainless steel grade that combines high strength with excellent corrosion resistance. Its ferritic-austenitic microstructure provides strong resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. Its high mechanical strength and fatigue resistance support a long service life under demanding operating conditions.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % | W % | Fe % |
| ≤ 0.03 | ≤ 1.00 | ≤ 1.00 | ≤ 0.035 | ≤ 0.015 | 24.00–26.00 | 6.00–8.00 | 3.00–4.00 | 0.50–1.00 | 0.50–1.00 | Bal. |
| Product form | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | ≥ 530 | 730–930 | ≥ 25 | ≤ 290 | 7.80 |
| Plate | ≥ 530 | 730–930 | ≥ 25 | — | 7.80 |
| Sheet | ≥ 550 | 750–1,000 | ≥ 20 | — | 7.80 |
| Pipe | ≥ 550 | 800–1,000 | ≥ 20 | — | 7.80 |
| Sector | Products |
| Oil and Gas | Valve bodies, wellhead components, subsea piping systems |
| Offshore and Marine | Seawater piping, pump shafts, propellers and impellers |
| Chemical and Petrochemical | Reactors, pressure vessels, process piping |
| Water Treatment & Desal. | High-pressure pipes, reverse-osmosis pump components, heat exchangers |
| Shipbuilding & Chem. Tankers | Chemical cargo tanks, cargo piping systems, valves |
| Pulp and Paper | Bleaching plant piping, process tanks, pump components |
| Power & Flue Gas Treatment | Scrubber units, flue gas ducts, heat exchangers |
| Mining & Mineral Processing | Slurry pumps, agitator shafts, abrasive-fluid piping |
1.4501 has good weldability, provided that heat input, interpass temperature, and cooling rate are controlled. A suitable super duplex filler metal should be used; preheating and post-weld stress-relief annealing are not recommended. Its high strength requires rigid machinery, sharp tools, and consistent feed rates during machining. Cold forming is possible, although high springback may require more powerful equipment.
1.4501, X2CrNiMoCuWN25-7-4, UNS S32760, ASTM A182 Grade F55, ASME SA-182 Grade F55.
| Product Form | ASTM | DIN/EN |
| Bar | ASTM A276 / ASTM A479 – UNS S32760 | DIN EN 10088-3 / DIN EN 10272 – 1.4501 |
| Plate | ASTM A240 – UNS S32760 | DIN EN 10088-2 / DIN EN 10028-7 – 1.4501 |
| Sheet | ASTM A240 – UNS S32760 | DIN EN 10088-2 / DIN EN 10028-7 – 1.4501 |
| Pipe | ASTM A789 – Tube / ASTM A790 – Pipe / ASTM A928 – EFW Pipe, UNS S32760 | DIN EN 10216-5 – Seamless pipe / DIN EN 10217-7 – Welded pipe, 1.4501 |
Note: ASTM A182 Grade F55 is used for forged components, flanges, and pressure-system fittings.
1.4410 / UNS S32750 / F53 – The closest super duplex alternative to 1.4501.
254 SMO / 1.4547 / UNS S31254 – May be considered where very high corrosion resistance is required.
1.4462 / UNS S32205 / F51 – A more readily available duplex alternative, but with lower corrosion resistance.
Outokumpu – Forta SDX 100 / 1.4501
BGH Edelstahlwerke – 1.4501 / S32760 / F55
BÖHLER – A911SA / 1.4501 / S32760 / F55
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
