2205 Duplex Stainless Steel Plate - UNS S32205

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2205 is a duplex stainless steel, with a chemical composition of nearly equal proportions of austenite and ferrite.  This combination allows the alloy to be stronger and tougher than standard austenitic steels. Duplex stainless steels like 2205 also maintain good weldability in their thickest sections, and they are much more resistant to stress corrosion cracking than standard austenitic steels.  

2205 Inventory Size Ranges


0.125"- 1.000"

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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, Storage and Transport
  • Pulp and Paper Industry
  • Mining Industry
  • Marine Applications
  • 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

Corrosion resistance is a critical component of materials built to withstand natural disasters.  Duplex stainless steel is less prone to damage by stress corrosion cracking.  It also offers good corrosion fatigue strength and its microstruction and small carbon magnitude allow duplex steel to stand up against intergranular attack.  Duplex grades have high surface toughness and can stand up to conditions of heavy water, sand or salt crystals. 

All of this was taken into consideration when Type 2205 was chosen for the entrances of South Ferry Station on Manhattan Island.  Sealable waterproof structures like these, made of Duplex 2205, protect the subway system from water infiltration during natural disaster events like Hurricane Sandy in 2012. 

High corrosion-resistant and high strength UNS S32205 can withstand the brackish or salt water impact of a coastal flood surge. This quality along with long service life and low maintenance requirements led to the use of 2205 duplex stainless steel in pedestrian bridges.  The Helix in Marina Bay, Singapore and the Harbor Drive Pedestrian Bridge in San Diego, CA both use 2205 as a primary structural material providing high strength, sustainable structures with cutting-edge design.  

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