Duplex 2205 Stainless Steel

UNS S31803


Find the Best of Both Worlds with 2205 Stainless Steel

For jobs that require reliable steel strength and good corrosion resistance, 2205 Duplex is the key. Because this stainless steel is both ferritic and austenitic, it combines the top benefits of both alloys.

In the past, builders would have to sacrifice corrosion resistance in exchange for a strong and flexible steel. However, with its high chromium and molybdenum levels, 2205 stainless steel will resist corrosion and cracking while maintaining an excellent degree of strength.

Typical Applications

Along with water treatment and electrical industries, 2205 is useful for a wide variety of industries, as found in several different products. For instance, this alloy is particularly helpful for:

  • Heat exchangers, pipes, and tubes
    • For handling oil and gas
    • In desalination plants
  • Pressure vessels, pipe, and tanks
    • For processing and transporting chemicals
    • In process industries for chloride handling
  • Rotors, shafts, press rolls, and fans
  • Cargo tanks, welding consumables, and piping for chemical tankers

For any task where filaments undergo extreme stress, fatigue, rust, or temperatures, using our 2205 (duplex) steel reduces the need for replacements and repairs.

Design Features

What is responsible for 2205 Duplex’s durability and strength? 2205 stainless steel has these useful traits:

  • High crevice and pitting resistance
  • Low thermal expansion
  • Higher heat conductivity potential
  • High stress, fatigue, and erosion resistance
  • Uniform corrosion resistance
  • High sulfide stress resistance

This type of steel has many uses. Its particular chemical composition solves many of the common problems engineers face with weaker alloys.


  • Seamless Pipe 1/2”- 8”
  • Weld Pipe 1/2” – 24”
  • Butt-Weld Fittings 1/2” – 24”
  • Flanges 1/2″ – 24″
  • Bar 1″ – 8″
  • Plate 1/8″ – 3″


  • ASTM A790, A815, A182
  • ASME SA790, SA815, SA182

Tensile Requirements

Tensile strength is 65 KSI and yield strength is 90 KSI. This is equivalent to 488.175 MPA and 620.55 MPA.

To explore our inventory, visit our materials page. If you still have questions, we’d be happy to answer them. Call us at 908-526-1222 today.

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Chemical Composition

C Cr Fe Mn Mo N Ni P S Si
Max Max Max Max Max
0.030 21.0-23.00 Bal 2.0 2.50 – 3.50 0.08 – 0.20 4.50 – 6.50 0.03 0.02 1.0