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 above 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 182ASME SA 240ASME SA 479ASME SA 789ASME SA 789 Section IV Code Case 2603
ASTM A 240ASTM A 276ASTM A 276 Condition AASTM A 276 Condition SASTM A 479ASTM A 790
NACE MR0175/ISO 15156
NORSOK MDS D45 Grade F51
UNS S31803UNS 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)