UNS S32205 Duplex Stainless Steel: Twice the Strength of 316L
ASTM A240/A789 · Updated: 2026-05-25
UNS S32205 (2205) is a duplex stainless steel with a balanced ferrite-austenite microstructure (~50/50), combining the best properties of both phases: approximately double the yield strength of 316L (450 vs 170 MPa) with excellent chloride stress corrosion cracking resistance. Its PREN (Pitting Resistance Equivalent Number) of 34-36 exceeds 316L (25-28), making it suitable for seawater-cooled heat exchangers, chemical tankers, desalination plants, and offshore structures. Resistant to temperatures from -50°C to +300°C, though prolonged exposure above 300°C may cause embrittlement from alpha-prime phase formation.
Quick Facts
| Category | Stainless Steel |
| Standard | ASTM A240/A789 |
| Density | 7.80 g/cm³ |
| Yield Strength | 450 MPa (65 ksi) |
| Tensile Strength | 655 MPa (95 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN 1.4462 | Compare |
| X2CrNiMoN22-5-3 | Compare |
| SUS329J3L | Compare |
| 022Cr22Ni5Mo3N | Compare |
| 2205 | Compare |
Related Comparisons
Related Materials
🧮 Material Weight Calculator
Calculate the weight based on this material's density: 7.80 g/cm³
Frequently Asked Questions
What are the welding requirements for 2205 duplex?
Use matching or slightly over-alloyed filler (ER2209). Maintain heat input of 0.5-2.5 kJ/mm—too low prevents proper austenite reformation, too high promotes intermetallic phases. Interpass temperature must stay below 150°C. No preheat is needed. Post-weld solution annealing at 1020-1100°C followed by water quenching is recommended for critical corrosion service, though many non-critical applications accept as-welded condition.