ALLOYS
2205 Duplex
2205 is a duplex (austenitic-ferritic) stainless steel containing about 40 – 50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction.
UNS: S31803/S32205
Stock Sizes: 1/4” – 1” OD
Specifications:
- Seamless Tube: ASTM A789
- NACE MR0175/MR0103
Available Processing:
- Cold Worked and Bright Annealed
Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification
Chemical Composition (%)
| Chemical | Percentage |
|---|---|
| Iron (Fe) | Balance |
| Chromium (Cr) – S31803 | 21-23% |
| Chromium (Cr) – S32205 | 22-23% |
| Nickel (Ni) | 4.5-6.5% |
| Molybdenum (Mo) – S31803 | 2.5-3.5% |
| Molybdenum (Mo) – S32205 | 3.0-3.5% |
| Chemical | Percentage |
|---|---|
| Manganese (Mn) | 2% Max |
| Silicon (Si) | 1% Max |
| Carbon (C) | 0.030% Max |
| Sulfur (S) | 0.020% Max |
| Phosphorus (P) | 0.030% Max |
| Nitrogen (N) | 0.08-0.20% Max |
| – | – |
Physical Properties
| Property | Measurement |
|---|---|
| Density (lb/in3) | 0.278 |
| Elongation (min %) | 25 |
| Minimum Yield (psi) – S31803 | 65,000 |
| Minimum Yield (psi) – S32205 | 70,000 |
| Minimum Tensile (psi) – S31803 | 90,000 |
| Minimum Tensile (psi) – S32205 | 95,000 |
| Max Hardness (HRC) | 30 |