Duplex 2205 · UNS S32205 / S31803 · W. Nr. 1.4462 · 022Cr23Ni5Mo3N · F51 / F60
Duplex Stainless Steel 2205 (S32205 / S31803): composition, properties, fittings and flanges
Duplex stainless steel 2205 (UNS S32205, formerly S31803, W. Nr. 1.4462, ASTM A182 F51 / F60) has a mixed ferritic-austenitic microstructure containing roughly equal proportions of both phases. The chemistry is 22-23 % chromium, 4.5-6.5 % nickel, 3.0-3.5 % molybdenum and 0.14-0.20 % nitrogen. The result is a minimum tensile…
- UNS
- S32205 / S31803
- W. Nr.
- 1.4462
- Density
- 7.80 g/cm³ (0.281 lb/in³)
- Key strength
- 620 MPa / 90 ksi
Identification and standards
| Short form | Duplex 2205 · UNS S32205 / S31803 · W. Nr. 1.4462 · 022Cr23Ni5Mo3N · F51 / F60 |
|---|---|
| Classification | Ferritic-austenitic duplex stainless steel (22 % Cr, 5 % Ni, 3 % Mo, N) |
| UNS | S32205 / S31803 |
| Werkstoff number | 1.4462 |
| Material family | Stainless Steel |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Chromium (Cr) | 22.0 - 23.0 | Passive film, pitting resistance |
| Nickel (Ni) | 4.5 - 6.5 | Austenite phase balance |
| Molybdenum (Mo) | 3.0 - 3.5 | Pitting and crevice resistance |
| Nitrogen (N) | 0.14 - 0.20 | Strength and pitting resistance, austenite stabiliser |
| Manganese (Mn) | 2.00 max | - |
| Silicon (Si) | 1.00 max | - |
| Phosphorus (P) | 0.030 max | - |
| Sulphur (S) | 0.020 max | - |
| Carbon (C) | 0.030 max | - |
| Iron (Fe) | Balance | Matrix |
Note Single figures are maximum limits unless shown as a range. Always confirm against the heat-specific EN 10204 3.1 certificate supplied with your order.
Mechanical properties
| Tensile strength, min (ASTM A240) | 620 MPa / 90 ksi |
|---|---|
| 0.2 % yield strength, min | 450 MPa / 65 ksi |
| Elongation in 2 in, min | 25 % |
| Maximum hardness | 293 HB / 31 HRC |
| Typical impact energy at -50 °C | Above 100 J |
| Recommended service temperature range | -50 °C to 300 °C |
Warning Values depend on product form, section thickness and heat treatment. Larger sections generally achieve lower strength than thin product; always design against the applicable code allowable stress rather than these figures.
Physical properties
| Density | 7.80 g/cm³ (0.281 lb/in³) |
|---|---|
| Melting range | Approximately 1350 °C (2460 °F) |
| Modulus of elasticity | 190 GPa (27.6 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 15.0 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 13.0 µm/m·°C |
| Electrical resistivity at 20 °C | 0.85 µΩ·m |
| Magnetic behaviour | Magnetically responsive because of the ferritic phase |
Specifications by product form
| Pipe, seamless / welded | ASTM A790 / A928 / ASME SA-790 |
|---|---|
| Tube | ASTM A789 (seamless and welded tube) |
| Plate / sheet / strip | ASTM A240 / ASME SA-240 (UNS S32205) |
| Bar / rod / shapes | ASTM A276 / A479 / ASME SA-479 |
| Forgings & flanges | ASTM A182 Grade F51 (S31803) / F60 (S32205) / ASME SA-182 |
| Butt weld fittings | ASTM A815 / ASME SA-815 (WP22Cr5Ni3Mo2N, WP-S / WP-W) |
| Welding consumables | ER2209 filler to AWS A5.9, over-alloyed in nickel for correct phase balance |
| UNS / EN / China | UNS S32205 · W. Nr. 1.4462 · GB 022Cr23Ni5Mo3N |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Seamless and welded pipe to ASME B36.19M schedules
- Butt weld elbows, tees, reducers and caps to ASME B16.9
- Forged flanges to ASME B16.5 Class 150-2500
- Machined valve bodies, pump bowls and structural connectors
Typical applications
- Chemical tanker cargo tanks, pipes and cargo handling systems
- Subsea flowlines, umbilicals, risers and manifolds
- Oil and gas produced water, seawater injection and firewater systems
- Desalination plants, reverse osmosis high pressure pipework
- Pulp and paper digesters, bleach towers and liquor tanks
- Storage tanks, pressure vessels and heat exchangers
- Structural bridges, architectural and reinforcing applications in coastal areas
Welding, forming and machining
- Welding
- Weld with ER2209 filler, which is nickel enriched to restore the correct ferrite-austenite balance. Control interpass temperature below 150 °C and heat input between roughly 0.5 and 2.5 kJ/mm to avoid excessive ferrite or sigma phase precipitation.
- Heat treatment
- Solution anneal at 1020-1100 °C and water quench. Never stress relieve in the 300-950 °C range, which causes sigma phase precipitation and loss of toughness.
- Forming
- Higher strength means higher forming loads than austenitic grades; allow for greater springback and typically larger bend radii.
- Machining
- Higher cutting forces than 316L. Use rigid setups, sharp carbide tools and moderate speeds with abundant coolant.
Buy Duplex Stainless Steel 2205 from Hangbo
Material is supplied with full heat-number traceability, solution annealing or ageing performed under calibrated furnace control, and an EN 10204 3.1 certificate covering chemical analysis, mechanical properties, heat treatment records and the agreed NDT scope. Positive material identification and third party inspection and test reports from SGS are available for critical service.