F53 SUPER DUPLEX Stainless Steel 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, combining very high mechanical strength (up to 530 MPa yield strength) with exceptional corrosion resistance in marine and highly 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 & Gas, marine, chemical and power generation sectors for critical applications.
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Reference standards:
- ASTM A182 F53 (flanges and forgings)
- ASTM A276, A479 (bars)
- ASTM A240 (plates and strips)
- EN 10088-3 1.4410 (X2CrNiMoN25-7-4)
- NORSOK MDS D51-D55, D57, D58
- NACE MR01-75 / ISO 15156 (sour service applications)
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 |
| Sulphur (S) | – | 0.015 |
| Phosphorus (P) | – | 0.035 |
Pitting Resistance Equivalent Number (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) |
| Elongation | ≥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 |
| Specific Heat (20°C) | 500 J/kg·K |
| Thermal Expansion Coefficient (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 water quenching to maintain the duplex structure.
- Hot forming: The optimum temperature for plastic deformation is between 950 and 1200°C.
- Cold forming: Greater force required compared to austenitic stainless steels, may require intermediate annealing.
Available forms
F53 SUPER DUPLEX stainless steel S32750 is available in the following forms:
Industrial applications
Thanks to its very high resistance to corrosion and chloride stress corrosion cracking, F53 SUPER DUPLEX S32750 is ideal for:
- Aerospace and Defence: Structural components and high-strength 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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