2205

2205

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.

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

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, 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

Inventory

2205 Coil, 2205 Pipe, 2205 Plate, 2205 Sheet, 2205 Welding Products

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

Applications

  • 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

Physical Properties

Density: 0.278 lb/inch3
Melting Point: 2525- 2630°F
Poisson's Ratio: 0.3
Electrical Resistivity: 481 Ohm - circ mil/ft

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)