What is 1.4462 Stainless Steel
Jan 13, 2026
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1.4462 stainless steel, widely recognized as Duplex 2205 or UNS S32205, is a ferritic-austenitic duplex stainless steel. It combines the beneficial properties of both austenitic and ferritic grades, offering significantly higher strength and superior stress corrosion cracking resistance compared to standard 300-series stainless steels, making it ideal for demanding sectors like oil & gas, chemical processing, and offshore applications.
The duplex grade 1.4462 is identified under various international standards.
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | 1.4462 |
| ASTM/AISI (USA) | 2205, UNS S32205 |
| JIS (Japan) | SUS329J3L |
The balanced chemical composition is key to its duplex microstructure and performance.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| Content (%) | ≤ 0.03 | ≤ 1.0 | ≤ 2.0 | ≤ 0.035 | ≤ 0.02 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.10 - 0.22 |
Duplex 2205 exhibits roughly double the yield strength of common austenitic grades.
| Property | Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A) | Hardness (HB) | Impact (J) |
|---|---|---|---|---|---|
| Typical Value | ≥ 450 MPa | 620 - 880 MPa | ≥ 25% | ≤ 293 | ≥ 100 |
Key Characteristics and Applications of 1.4462 / Duplex 2205
High Strength & Excellent Fatigue Resistance: Its duplex structure provides high yield strength, allowing for thinner, lighter structures and components.
Outstanding Corrosion Resistance: Offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride environments.
Good Weldability: Can be welded using common techniques, though care must be taken to maintain the balanced microstructure in the weld zone.
Primary Applications:
Oil & Gas: Pressure vessels, pipelines, heat exchangers, and offshore platform components.
Chemical & Petrochemical: Tanks, reactors, and piping systems handling corrosive media.
Pulp & Paper Industry: Digesters, bleaching equipment.
Marine & Offshore: Seawater piping systems, propeller shafts, and desalination plants.
How does Duplex 2205 (1.4462) compare to 316L (1.4404) in terms of performance?
Duplex 2205 offers approximately twice the yield strength of 316L, providing significant weight-saving potential in structural designs. It also demonstrates superior resistance to stress corrosion cracking (SCC) in chloride environments. While both have good pitting resistance, 2205 generally has a higher Pitting Resistance Equivalent Number (PREN), making it suitable for more aggressive conditions than 316L.
What are the key considerations when welding 1.4462 duplex stainless steel?
The primary goal is to preserve the balanced 50/50 ferrite-austenite microstructure in the weld and heat-affected zone. This requires using matching or over-alloyed filler metals, controlling heat input to avoid excessive grain growth, and ensuring proper shielding to prevent nitrogen loss. Post-weld cooling rate is also critical to avoid the formation of detrimental intermetallic phases.
Looking for a Reliable Supplier of 1.4462 / Duplex 2205 Stainless Steel?
GNEE Steel supplies high-quality Duplex 2205 (1.4462) stainless steel in plate, pipe, and bar forms. We support your projects with processing services and provide full material certification to ensure compliance with international standards. If you have any requirements, please feel free to contact us.
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