Stainless Steel Worth A Look - 2205 Duplex Stainless Steel

2205 duplex stainless steel overview：

2205 duplex stainless steel is the common name for the most commonly used duplex stainless steel. When the corrosion resistance of 316/316L stainless steel is not enough to meet the requirements, 2205 duplex stainless steel becomes the preferred alternative material.

Approximate composition: Contains approximately 22% chromium, 5% nickel, 3% molybdenum, and 0.15% nitrogen (exact composition ranges may vary between EN and ASTM standards)

peculiarity：

• Design strength: Twice that of standard austenitic stainless steel.

• Excellent pitting and crevice corrosion resistance.

• Excellent resistance to stress corrosion cracking.

• Good weldability.

• Moderate impact toughness up to -80 °C.

Application field：

2205 duplex stainless steel performs well in many chemical and Marine processes, where environmental conditions are harsh and beyond the limits of more common grades such as 316/316L. 2205 duplex stainless steel offers significant improvements in corrosion resistance. The increased strength can also lead to a reduction in section thickness, which means that the overall cost can be comparable to 316/316L. Resistance to stress corrosion cracking is particularly important in chemical and food processing above 50°C. Although weldability is good, manufacturers need to be trained on specific parameters to ensure welding quality.

Typical applications include:

• Offshore oil and gas: used in Marine environments due to its corrosion resistance.

• Chemical processing: In the chemical processing industry, for the treatment of various chemicals.

• Desalination plants: used to resist corrosion in high salinity environments.

• Pulp and paper: Equipment used in the pulp and paper industry.

• Sculpture: In coastal areas, due to its corrosion resistance.

• Brewing: Used in beer brewing equipment.

• Food processing: Used in food processing equipment.

• Bridges: Used in bridge structures because of their strength and corrosion resistance.

• Tension system: A structural system used to maintain tension.

• Nuclear reprocessing: Used in the nuclear industry to dispose of radioactive materials.

• Tunnel infrastructure: Structures used in tunnel construction.

• Chemical carriers: Used to create ship structures that are resistant to chemical corrosion.

Sum up：

2205 duplex stainless steel is ideal for more challenging environments.