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. 2205 is not suggested for operating temperatures up to 600°F.
The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below - 40°F. 2205 is welded with E2209 or ER2209 fillers.
The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below - 40°F. 2205 is welded with E2209 or ER2209 fillers.
Specifications
UNS S31803, UNS S32205, Werkstoff 1.4462, EN 1.4462
ASTM: A 240, A 276, A 479, A 789, A 790, A 182 (Grade F51), A 923
ASME: SA-240, SA-479, SA-789, SA-790, SA-182 (Grade 51), ASME Pgroup 10H, NACE ISO 15156 / MR0175
Chemical Composition, %
ASTM: A 240, A 276, A 479, A 789, A 790, A 182 (Grade F51), A 923
ASME: SA-240, SA-479, SA-789, SA-790, SA-182 (Grade 51), ASME Pgroup 10H, NACE ISO 15156 / MR0175
| Ni | Cr | Mo | Mn | Si | C | N | S | P | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 4.5 | 22.0 | 3.0 | - | - | - | 0.14 | - | - | - |
| MAX | 6.5 | 23.0 | 3.5 | 2.0 | 1.0 | 0.03 | 0.2 | 0.02 | 0.03 | Balance |
- High resistance to chloride stress corrosion cracking
- Chloride pitting and crevice corrosion resistance superior to 317L stainless
- Good general corrosion resistance
- High strength
- Good sulfide stress corrosion resistance
- Useful up to 600°F
- Chemical process vessels, piping, and heat exchangers
- FGD scrubber systems
- Pulp mill digesters, bleach washers, chip presteaming vessels
- Food process equipment
- Oil field piping, heat exchangers
Density: 0.278 lb/inch3
Melting Point: 2525- 2630°F
Poisson's Ratio: 0.3
Electrical Resistivity: 481 Ohm - circ mil/ft
Melting Point: 2525- 2630°F
Poisson's Ratio: 0.3
Electrical Resistivity: 481 Ohm - circ mil/ft
Mechanical Properties
Minimum Specified Properties, ASTM A 240
| Ultimate Tensile Strength, ksi | 95 |
| 0.2% Yield Strength, ksi | 65 |
| Elongation, % | 25 |
| Hardness MAX, Brinell | 290 |
Minimum Elevated Tensile Properties, Plate
| Temperature, °F | 212 | 302 | 392 | 482 |
| Ultimate Tensile Strength, ksi | 86 | 83 | 80 | 78 |
| 0.2% Yield Strength, ksi | 52 | 49 | 46 | 44 |
Corrosion Resistance
| PREn | Critical Pitting Temperature, CPT | |
| 2205 | 34 | 130°F |
| 316L |