F51 DUPLEX Stainless Steel W. Nr. 1.4462 – UNS S31803 ASTM A182
F51 DUPLEX
F51 DUPLEX UNS S31803 wr. 1.4462 stainless steel is an alloy with a 50% balanced microstructure between austenite and ferrite, offering high mechanical strength and good corrosion resistance. Thanks to its composition, it guarantees good resistance to chloride stress corrosion cracking and can be used in aggressive environments where austenitic stainless steels would not be adequate.
This alloy is used in critical industrial applications, such as in the Oil & Gas, chemical, marine sectors and in power generation. F51 DUPLEX S31803 can be supplied with a PREN (Pitting Resistance Equivalent) >34, which ensures high resistance to pitting corrosion.
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Reference standards:
- ASTM A182 F51 (flanges and forgings)
- ASTM A276, A479 (bars)
- ASTM A240 (plates and strips)
- EN 10088-3 1.4462 (X2CrNiMoN22-5-3)
- NORSOK MDS D41-D45, D47, D48
- NACE MR01-75 / ISO 15156 (applications in sour environments)
Chemical composition (%)
| Element | Min (%) | Max (%) |
|---|---|---|
| Chromium (Cr) | 21.0 | 23.0 |
| Nickel (Ni) | 4.5 | 6.5 |
| Molybdenum (Mo) | 2.5 | 3.5 |
| Nitrogen (N) | 0.10 | 0.22 |
| Carbon (C) | – | 0.03 |
| Manganese (Mn) | – | 2.00 |
| Silicon (Si) | – | 1.00 |
| Sulfur (S) | – | 0.015 |
| Phosphorus (P) | – | 0.035 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 650 – 880 MPa (94 – 128 ksi) |
| Yield Strength (0.2% Proof Strength) | ≥450 MPa (65 ksi) |
| Elongation | ≥25% |
| Hardness (Max) | 270 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.
- Hot forming: The optimal temperature for hot plastic deformation is between 950 and 1200°C.
- Cold forming: Can be cold worked, but requires higher working forces compared to austenitic stainless steels.
Available forms
F51 DUPLEX stainless steel S31803 is available in the following forms:
Industrial applications
Thanks to its high mechanical strength and corrosion resistance, DUPLEX F51 S31803 is widely used in the following sectors:
- Aerospace and Defence: High-strength structural components.
- Power Generation: Heat exchangers, turbines and piping.
- Chemical and Pharmaceutical Industry: Storage tanks, reactors and chemical processing plants.
- Motorsport: Critical components with high mechanical strength.
- Nuclear: Corrosion-resistant containers and piping.
- Oil & Gas: Pipelines, flanges, valves and fittings for high-pressure environments and hydrogen sulfide presence.
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