Super Duplex 2507 — Sheet, Plate, Coil, Pipe & Tube & Fittings
Also sold as UNS S32750 · W.Nr 1.4410 · F53 · SAF 2507
Super Duplex 2507 is a super duplex stainless steel, chosen for seawater and high-chloride service where strength also matters. We supply it as sheet, plate, coil, pipe & tube, fittings, flanges, fasteners, with EN 10204 3.1 certificates, from Mumbai to India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- UNS S32750
- W.Nr 1.4410
- PREN ≈ 42
- ρ 7.8 g/cm³
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Super Duplex 2507 Products
Super Duplex 2507 Names, Designations & Composition
Super Duplex 2507 is one alloy sold under several names. Its UNS number is S32750, the European material number is W.Nr 1.4410 and the EN name is X2CrNiMoN25-7-4. The chart on the right shows the specified range of each main alloying element; the balance is the base metal.
Super Duplex 2507 Specifications by Product — Which Standard Applies?
The material standard changes with the product form. This is the table buyers ask for most.
| Product | Material standard | Dimensions |
|---|---|---|
| Super Duplex 2507 sheet | ASTM A240 | ASTM A480 / B906 |
| Super Duplex 2507 plate | ASTM A240 | ASTM A480 / B906 / A20 |
| Super Duplex 2507 coil | ASTM A240 | ASTM A480 |
| Super Duplex 2507 pipe & tube | ASTM A790 · ASTM A790 · A928 | ASME B36.19 / B36.10 |
| Super Duplex 2507 fittings | ASTM A815 WPS32750 · ASTM A182 F53 | ASME B16.9 · B16.11 |
| Super Duplex 2507 flanges | ASTM A182 F53 | ASME B16.5 · B16.47 |
| Super Duplex 2507 fasteners | ASTM A1082 (S32750) where specified for applicable duplex bolts, studs, cap screws and nuts; for other types, material may be supplied to ASTM A276 / A479 bar where applicable, subject to the purchase specification | ASME B18.2.1 · B18.2.2 |
Super Duplex 2507 Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Nitrogen | As specified |
| Copper | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Iron | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S32750.
Super Duplex 2507 Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S32750 — Solution-annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting range | 1350 – 1400 °C |
| Magnetic | Magnetic (ferritic phase) |
| PREN (approx.) | ≈ 42 |
Super Duplex 2507 Equivalent Grades
Super Duplex 2507 Corrosion Resistance — What Each Element Does
High chromium, molybdenum and nitrogen put PREN above 40 — the usual threshold for seawater service.
Much higher yield strength than 316L.
Excellent resistance to chloride stress-corrosion cracking.
Keep service below about 250 °C.
Where Is Super Duplex 2507 Used? Applications
Super Duplex 2507 vs 2205, 625 and C276
| Grade | PREN (approx.) | Pick it for |
|---|---|---|
| Duplex 2205 | ≈ 35 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 | ≈ 42 | Seawater and high-chloride service where strength also matters |
| Inconel 625 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
| Hastelloy C276 | ≈ 68 | The most aggressive mixed acids, wet chlorine and hypochlorite |
Welding Super Duplex 2507
| Matching filler | ER2594 (AWS A5.9) |
|---|---|
| Also used | Tight heat-input control and ferrite checks on procedure qualification |
Super Duplex 2507 for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSuper Duplex 2507 — questions buyers ask
What is Super Duplex 2507?
Super Duplex 2507 is a super duplex stainless steel. It is chosen for seawater and high-chloride service where strength also matters.
Which standards cover Super Duplex 2507 products?
Sheet: ASTM A240; Plate: ASTM A240; Coil: ASTM A240; Pipe & Tube: ASTM A790 · ASTM A790 · A928; Fittings: ASTM A815 WPS32750 · ASTM A182 F53; Flanges: ASTM A182 F53; Fasteners: ASTM A1082 (S32750) where specified for applicable duplex bolts, studs, cap screws and nuts; for other types, material may be supplied to ASTM A276 / A479 bar where applicable, subject to the purchase specification. Always name the standard and edition on your order.
What is the UNS number of Super Duplex 2507?
UNS S32750, with the European material number W.Nr 1.4410.
What is the density of Super Duplex 2507?
7.8 g/cm³ — use it to calculate weights: plate kg = L(m) × W(m) × t(mm) × 7.8.
Super Duplex 2507 or Hastelloy C276?
Super Duplex 2507 suits seawater and high-chloride service where strength also matters; Hastelloy C276 is the step up for the most aggressive mixed acids, wet chlorine and hypochlorite.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026