Duplex 2205 (UNS S32205): High-Strength Corrosion-Resistant Stainless Steel
ASTM A789/A790 · Published: 2026-06-03 · Updated: July 2026
Duplex 2205 has a mixed austenite-ferrite microstructure that delivers approximately twice the yield strength of 304/316 while offering superior chloride stress corrosion cracking resistance. It is the standard material for offshore oil & gas...
Duplex 2205 has a mixed austenite-ferrite microstructure that delivers approximately twice the yield strength of 304/316 while offering superior chloride stress corrosion cracking resistance. It is the standard material for offshore oil & gas piping, chemical tankers, and desalination plants.
Quick Facts
| Category | Stainless Steel |
| Standard | ASTM A789/A790 |
| Density | 7.80 g/cm³ |
| Yield Strength | 450 MPa |
| Tensile Strength | 655 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
What is the temperature limitation of Duplex 2205?
Duplex 2205 is rated for continuous service from -50°C to 300°C. Above 300°C, the ferrite phase undergoes spinodal decomposition (475°C embrittlement), reducing toughness. It should not be used above 300°C for pressure-containing applications without specific qualification.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu