F53 SUPER DUPLEX Acciaio inox W. Nr. 1.4410 – UNS S32750 ASTM A182
F53 SUPER DUPLEX
F53 SUPER DUPLEX UNS S32750 wr.1.4410 stainless steel is an alloy with a balanced microstructure of 50% austenite and 50% ferrite, which combines very high mechanical strength (up to 530 MPa yield strength) with exceptional corrosion resistance in marine andhighly aggressive environments.
Thanks to its PREN (Pitting Resistance Equivalent) ≥40, it offers superior resistance to pitting and crevice corrosion compared to standard duplex stainless steels (e.g., UNS S31803). It is widely used in the oil and gas, marine, chemical, and power generation industries for critical applications.
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Reference standards:
- ASTM A182 F53 (flanges and forgings)
- ASTM A276, A479 (bars)
- ASTM A240 (sheet and strip)
- EN 10088-3 1.4410 (X2CrNiMoN25-7-4)
- 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 | 4.5 |
| Nitrogen (N) | 0.24 | 0.35 |
| Carbon (C) | – | 0.03 |
| Manganese (Mn) | – | 2.00 |
| 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 maintain the duplex structure.
- Hot forming: The optimum temperature for plastic deformation is between 950 and 1200°C.
- Cold forming: Higher strength required than austenitic stainless steels, may require intermediate annealing.
Available formats
F53 SUPER DUPLEX stainless steel S32750 is available in the following shapes:
Industrial applications
Thanks to its very high resistance to corrosion and chloride stress corrosion cracking, F53 SUPER DUPLEX S32750 is ideal for:
- Aerospace and Defense: High-strength structural components and valves.
- Power Generation: Heat Exchangers, Turbines and Piping.
- Chemical and Pharmaceutical Industry: Tanks and reactors for corrosive environments.
- Motorsport: High-performance structural components.
- Nuclear: Materials for radioactive and high-pressure environments.
- Oil & Gas: Pipelines, fittings, flanges and valves for subsea and high-pressure environments.
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