Super Duplex S32760: properties, composition, uses and standards
Super Duplex S32760 is a super duplex stainless steel with copper and tungsten, chosen for seawater firewater, injection and offshore piping. UNS S32760, W.Nr 1.4501, PREN ≈ 41, density 7.84 g/cm³.
What is Super Duplex S32760?
Super Duplex S32760 is a super duplex stainless steel with copper and tungsten. Engineers choose it for seawater firewater, injection and offshore piping. It is also known as UNS S32760, W.Nr 1.4501, F55, Zeron 100, SAF 32760.
- UNS
- S32760
- W.Nr
- 1.4501
- EN
- X2CrNiMoCuWN25-7-4
- Forging grade
- F55
- Trade names
- Zeron 100
- Density
- 7.84 g/cm³
- Melting range
- 1350 – 1400 °C
- Magnetic
- Magnetic (ferritic phase)
- PREN (approx.)
- ≈ 41
Chemical composition and what each element does
| Element | Weight % |
|---|---|
| Chromium | 24.0 – 26.0 |
| Nickel | 6.0 – 8.0 |
| Molybdenum | 3.0 – 4.0 |
| Nitrogen | 0.20 – 0.30 |
| Copper | 0.50 – 1.00 |
| Tungsten | 0.50 – 1.00 |
| Carbon | 0.030 max |
| Manganese | 1.00 max |
| Silicon | 1.00 max |
| Iron | Balance |
Per ASTM A240 for UNS S32760.
Guaranteed PREN of 40 or more for seawater systems.
Copper and tungsten add resistance to sulphuric acid and crevice corrosion.
Yield around 550 MPa.
Keep service below about 250 °C.
Super Duplex S32760 at a glance
See the Super Duplex S32760 product page for every form we supply and its standard.
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength | 750 MPa · 109 ksi |
| Yield strength 0.2% | 550 MPa · 80 ksi |
| Elongation | 25% |
| Hardness | 270 HB max |
Solution-annealed plate, minimum values. Values for pipe, bar and forgings differ slightly — see the product standard.
Where Super Duplex S32760 is used
- Offshore. Firewater and seawater piping. Industry →
- Subsea. Manifolds and umbilical parts. Industry →
- Desalination. High-pressure brine lines. Industry →
Welding S32760
The matching filler is ER2594 · Zeron 100X. Qualified procedures with ferrite and impact checks.
Keep heat input moderate and interpass temperature low, clean joints thoroughly, and pickle or passivate after welding where the service is corrosive.
Super Duplex S32760 compared with similar grades
| Grade | PREN | Choose it for |
|---|---|---|
| Super Duplex S32760 | ≈ 41 | Seawater firewater, injection and offshore piping |
| Super Duplex 2507 | ≈ 42 | Seawater and high-chloride service where strength also matters |
| Duplex 2205 | ≈ 35 | Strength with chloride resistance at a stainless-steel budget |
| Inconel 625 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
Super Duplex S32760 standards by product
Buying Super Duplex S32760: what to specify
- The product standard and the UNS or designation — for example ASTM A240 UNS S32760.
- Size, thickness or schedule, and quantity in pieces and kg or metres.
- Heat-treatment condition where the standard offers a choice.
- Certificate: EN 10204 3.1 as standard, 3.2 if a third party must witness.
- NACE MR0175 / ISO 15156 compliance if the service contains H₂S.