2205 Duplex Stainless Steel Plate - UNS S32205

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2205 (UNS S32305) is a nitrogen-alloyed duplex stainless steel, with a chemical composition containing 22-23% chromium, 3-3.5% molybdenum, and 4.5-6.5% nickel.   The high chromium and molybdenum content provide good corrosion resistance, and the overall combination allows this alloy to be stronger and tougher than most standard austenitic steels. 2205 duplex stainless steels maintains good weldability in their thickest sections, and they are much more resistant to chloride stress corrosion cracking and pitting than standard austenitic steels like 316L or 317L.

2205 Inventory Size Ranges


0.125"- 1.000"

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Working with duplex 2205

With nearly twice the yield strength of other comparable austenitic grades, 2205 duplex steel products can withstand higher pressures and more corrosive environments with less material, saving on weight and fabrication costs.  This makes them ideal for chemical processing and storage pressure vessels and tanks, or high chloride environments for marine applications.

United Performance Metals stocks 2205 duplex stainless steel plate in thicknesses from 0.125" to 1.000", with FirstCut+ Processing services available. 

Heat Treatment and Heat Resistance

Similar to other duplex stainless steels, this grade of material can suffer from hydrogen embrittlement at temperatures over 300C.  To solve this issue, 2205 duplex steel plate should be solution annealed at 1900°F (1038°C) minimum up to 2012°F (1100°C), followed by a water quenching for rapid cooling. While it can be work hardened, thermal treatments will not harden this grade of stainless steel.

Machining and Weldability

The high strength of duplex 2205 makes it difficult to machine. Strong, rigid machines with low vibration are recommended, and carbide tooling will require lower feed speeds. 2205 plate is easily welded, but care should be taken to use appropriate filler materials (such as 2209, which is over-alloyed with additional nickel) to prevent excess ferrite formation.

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Standard Inventory Specifications

  • UNS S32205
  • ASTM A 240
  • ASME SA 240

Other industry standards we comply with:

  • W.NR. 1.4462
  • EN 10028-7

Common Trade Names

  • Duplex 2205

Common Applications of 2205

  • Chemical processing, pressure vessels for storage and transport
  • Mining Industry materials
  • Fans, shafts and rotors that require chloride or sulfide corrosion resistance
  • Marine Applications
  • Paper and pulp mill digesters, bleaching equipment
  • Oil and Gas Extraction and Processing
  • Heat Exchangers
Chemical Properties of 2205 duplex stainless
Element Percent by Weight
Cr Chromium 22.0 - 23.0%
Ni Nickel 4.5 - 6.5%
Mn Manganese 2.0% max
Si Silicon 1.0% max
P Phosphorous 0.03% max
S Sulfur 0.02% max
C Carbon 0.03% max
N Nitrogen 0.1 - 0.2%
Mo Molybdenum 3.0 - 3.5%
Fe Iron Balance

Physical properties of 2205 duplex steel

Physical property Value
Density:  0.278 lb/in3   
Melting Range: 2525-2630°F

Specific Heat Capacity at 212°F

0.119 Btu/lb/°F

Thermal Conductivity at 212°F

8.4 Btu/hr-ft-°F

Poisson's Ratio


Elastic Modulus at 72°F

29 x 10 psi

Mechanical properties of 2205 duplex

Mechanical property Value


0.2% Yield Strength, ksi


65 min


Tensile Strength, ksi


90 min


Elongation, %


25 min

Hardness [HRC]

293 max

Additional information about 2205 duplex materials

Duplex stainless steel, like 2205, has famously been used in structures like the entrances of the South Ferry Station on Manhattan Island.  These materials provide a necessary level of corrosion resistance, particularly against chloride-ion stress corrosion cracking, that is necessary when dealing with natural disasters like hurricane flooding.  When fatigue interacts with corrosion, a material like SS 2205 offers superior strength over more conventional grades of stainless steel like 316.  The sealable waterproof structures at the South Ferry Station protect the subway system from corrosive water infiltration.

2205 duplex stainless has also been used in pedestrian bridges, such as the Helix in Marina Bay, Singapore, and the Harbor Drive Pedestrian Bridge in San Diego, California.  As this high-strength material can withstand the physical impact of storm surges and coastal flooding, as well as resist the corrosive effect of brackish and salt water environments, it provides an excellent structural base for these structures.  These duplex grades of steel have high surface toughness with a long product life and lower maintenance requirements.

The technical data provided is for information only and not for design purposes.  It is not warranted or guaranteed.