F55 SUPER DUPLEX acciaio inox W. Nr. 1.4501 – UNS S32760 ASTM A182
F55 SUPER DUPLEX
F55 SUPER DUPLEX UNS S32760 Wr.1.4501 is an alloy with a 50% balanced microstructurebetween austenite and ferrite , which guarantees very high mechanical strength (up to 600 MPa yield strength) and superior corrosion resistance, particularly in marine environments and in the Oil & Gas industry.
Thanks to its PREN (Pitting Resistance Equivalent) ≥40, the steel provides excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking, making it a valid choice to replace 300 series stainless steels (e.g. AISI 316), standard duplex steels (S31803) and even nickel and titanium alloys in some applications.
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Reference standards:
- ASTM A182 F55 (flanges and forgings)
- ASTM A276, A479 (bars)
- ASTM A240 (sheet and strip)
- EN 10088-3 1.4501 (X2CrNiMoCuWN25-7-4)
- NORSOK MDS D51-D55, D57, D58
- NACE MR01-75 / ISO 15156 (applications in acidic environments)
Chemical composition (%)
| Element | Min (%) | Max (%) |
|---|---|---|
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 4.0 |
| Copper (Cu) | 0.50 | 1.00 |
| Nitrogen (N) | 0.20 | 0.30 |
| Tungsten (W) | 0.50 | 1.00 |
| Carbon (C) | – | 0.03 |
| Manganese (Mn) | – | 1.00 |
| Silicon (Si) | – | 1.00 |
| Sulfur (S) | – | 0.015 |
| Phosphorus (P) | – | 0.035 |
Pitting Resistance Index (PREN):
PREN = Cr % + (3.3 x Mo%) + (16 x N%)
Typical value: ≥40
Mechanical properties (at room temperature)
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 730 – 930 MPa (106 – 135 ksi) |
| Yield strength (0.2% Proof Strength) | ≥530 MPa (77 ksi) |
| Stretching | ≥25% |
| Hardness (Max) | 290 HB |
| Impact resistance (Charpy V-Notch, 20°C) | 100 J (74 ft.lb) |
Physical properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Heat capacity (20°C) | 500 J/kg K |
| Coefficient of thermal expansion (20 – 100°C) | 13.0 x 10⁻⁶ K⁻¹ |
| Thermal conductivity (20°C) | 15 W/m K |
| Electrical resistivity (20°C) | 0.80 Ω mm²/m |
| Modulus of elasticity (20°C) | 200 GPa |
Heat treatments
- Solution annealing: 1020 – 1100°C with rapid cooling in water to preserve the duplex microstructure.
- Hot forming: Optimal temperature between 950 and 1200°C.
- Cold forming: Higher strength required than austenitic stainless steels; may require intermediate annealing.
Available formats
F55 SUPER DUPLEX stainless steel S32760 is available in the following shapes:
Industrial applications
Thanks to its exceptional mechanical resistance and corrosion resistance, the F55 SUPER DUPLEX S32760 is used in the following sectors:
- Aerospace and Defense: Critical Structures and High-Strength Valves.
- Power Generation: Heat Exchangers and Piping Systems.
- Chemical and Pharmaceutical Industry: Tanks and process plants for corrosive environments.
- Motorsport: Structural components for high-performance vehicles.
- Nuclear: Materials for radioactive environments and cooling systems.
- Oil & Gas: Pipelines, valves, fittings, and flanges for subsea, corrosive, and high-pressure environments.
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