Specifications
- Plate: ASTM A240
- Bar: ASTM A276
Alloy 2205 gets the name Duplex because it is composed of two different types of grains. 40-50% of its grain structure is austenite and 50-60% of it is ferrite. It is closely related to, but much more popular than Alloy 255. In most environments, it surpasses 317L in crevice corrosion resistance. 2205 Duplex excels in chloride environments and resists hydrogen sulfide. 2205 Duplex has almost twice the strength of 316L. Due to the lower nickel and molybdenum content, it is less costly than Alloy C276. Among the places where 2205 Duplex is used include pressure vessels, heat exchangers and scrubbing systems.
If your question isn’t answered below, download the technical data sheet here.
| Temperature | ºF | 68 | 212 | 392 | 572 |
|---|---|---|---|---|---|
| Density | lb/in3 | 0.278 | – | – | – |
| Modulus of Elasticity | psi x 106 | 27.6 | 26.1 | 25.4 | 24.9 |
| Linear Expansion (68ºF-T) | 10-6/ºF | – | 7.5 | 7.8 | 8.1 |
| Thermal Conductivity | Btu/h ftºF | 8.7 | 9.2 | 9.8 | 10.4 |
| Heat Capacity | Btu/lb/ºF | 0.112 | 0.119 | 0.127 | 0.134 |
| Electrical Resistivity | Ωin x 10-6 | 33.5 | 35.4 | 37.4 | 39.4 |
| ASTM A 240 | Typical | |
|---|---|---|
| Yield Strength 0.2%, ksi | 65 min. | 74 |
| Tensile Strength, ksi | 90 min. | 105 |
| Elongation, % | 25 min. | 30 |
| Hardness RC | 32 max. | 19 |
| Temperature ºF | 122 | 212 | 392 | 572 |
| Yield Strength 0.2%, ksi | 60 | 52 | 45 | 41 |
| Tensile Strength, ksi | 96 | 90 | 83 | 81 |
| Nitric Acid | Good |
| Phosphoric Acid | Moderate |
| Sodium Hydroxide | Moderate |
| Sea Water | Moderate |
| Humidity | Excellent |
| Sulfuric Acid | Moderate |
| Acetic Acid | Good |
| Salt Spray (NaCl) | Excellent |
| Sour Oil/Gas | Moderate |
| Grade | Corrosion Rate, ipy |
|||||||
|---|---|---|---|---|---|---|---|---|
| Solution A, 140ºF | Solution B, 120ºF | |||||||
| 2205 | 3.1 | 3.9 | ||||||
| 316L | >200 | >200 | ||||||
| 904L | 47 | 6.3 | ||||||
| Composition, wt % | ||||||||
| P2O5 | HCI | HF | H2SO4 | Fe2O3 | Al2O3 | SiO2 | CaO | MgO |
| Sol A 54.0 | 0.06 | 1.1 | 4.1 | 0.27 | 0.17 | 0.10 | 0.20 | 0.70 |
| Sol B 27.5 | 0.34 | 1.3 | 1.72 | 0.4 | 0.01 | 0.3 | 0.02 | – |
| Grade | Boiling | Wick | Boiling |
|---|---|---|---|
| 42% MgCl2 | Test | 25% NaCl | |
| 2205 | F | P | P |
| 254 SMO® | F | P | P |
| Type 316L | F | F | F |
| Type 317L | F | F | F |
| Alloy 904L | F | P or F | P or F |
| Alloy 20 | F | P | P |
(P = Pass, F = Fail)
| Max Forming Temp. (recommended) | 600°F |
| Working Range | 1750° – 2250°F |
| Minimum Annealment Temp. (full solution) | 1900°F |
