Electric Welded Pipe 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. 2205 is not suggested for operating temperatures above 600°F.
The design strength of 2205 Electric Welded Pipe Duplex 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.
Chemistry
NiCrMoMnSiCNSPFe
| 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 |
Electric Welded Pipe Duplex Specifications
ASME SA 182, ASME SA 240, ASME SA 479, ASME SA 789, ASME SA 789 Section IV Code Case 2603
ASTM A 240, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 479, ASTM A 790
NACE MR0175/ISO 15156, NORSOK MDS D45 Grade F51, UNS S31803
UNS S32205
W. NR./EN 1.4462
Common Trade Names
2205 Stainless, Duplex 2205
Features
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
Applications
| Temperature, °F | 70 | 212 | 392 | 572 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 8 | 8 | 8 |
| Thermal Conductivity Btu • ft/ft2 • hr • °F | 8 | 9 | 10 | 11 |
| Modulus of Elasticity, Dynamic psi x 106 | 28 | 26 | 25 | 24 |
* 70°F to indicated temperature.
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 | 24 | 62°F |
PREN = %Cr + 3.3 %Mo + 16 %N CPT; ASTM G150 (5.8% NaCl)
