2205 Duplex Stainless Steel
2205 is a duplex stainless steel with an austenitic and ferritic structure. It contains 22% to 23% chromium, 4.5% to 6.5% nickel, 3.0% to 3.5% molybdenum, and 0.14% to 0.20% nitrogen. The source states that its yield strength is about 2 times that of austenitic stainless steel. It resists chloride pitting, crevice corrosion, and stress corrosion cracking while retaining toughness and weldability. The source describes stable performance from -50℃ to +600℃ for demanding corrosive environments.
Product details
Chemical composition
| 2205 | C | Si | Mn | P | S | Ni | Cr | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 4.5 | 22.0 | 3.0 | 0.14 |
| max | 0.03 | 1.0 | 2.0 | 0.03 | 0.02 | 6.5 | 23.0 | 3.5 | 0.2 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Duplex 2205 | S31803 S32205 | 1.4462 | SUS329J3L | 022Cr22Ni5Mo3N 022Cr23Ni5Mo3N | F51 X2CrNiMoN22-5-3 |
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Physical properties
| Density g/cm³ | 7.98 |
|---|---|
| Melting range ℃ | 1300-1390 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 13.7 |
| Specific heat J/kg•℃ | 460 |
| Elastic modulus GPa | 200 |
| Electrical resistivity μΩ•m | 0.8 |
| Linear expansion coefficient a/10-6℃-1 | 13.7 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥795 |
|---|---|
| Yield strength RP0.2 N/mm | ≥550 |
| Elongation % | ≥15 |
| Hardness HB | ≤310 |
| *After solution heat treatment | |
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Applications
- Chemical processing: reactors, heat exchangers, and piping for corrosive media such as sulfuric and phosphoric acid
- Oil and gas: offshore drilling-platform equipment, piping for sulfur-bearing or acidic oil and gas, and separators
- Marine engineering: ship components such as propellers, shafts, and valves, plus high-pressure reverse-osmosis systems for seawater desalination
- Environmental protection: waste-incinerator components, flue gas desulfurization (FGD) units, and wastewater treatment systems
- Energy: power-plant condensers and nuclear-power equipment requiring chloride-corrosion resistance
- Food and pharmaceutical processing: tanks and piping requiring high hygiene, corrosion resistance, and cleanability
- Mechanical engineering: high-strength corrosion-resistant parts such as pump shafts, impellers, and fasteners, including bleaching equipment in the paper industry
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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