Why is 2205 duplex stainless steel used in chemical equipment?

Key Properties for Chemical Equipment:

 

Corrosion Resistance: Offers excellent resistance to pitting and crevice corrosion in chloride-containing (like seawater) and acidic solutions, outperforming 316L/317L.

 

Chloride Stress Corrosion Cracking (SCC) Resistance: The duplex structure inherently resists SCC, a major failure mode for austenitic steels in hot, chloride environments.

 

High Strength & Fatigue Resistance: Offers twice the strength of austenitic grades, with high corrosion fatigue strength for components under dynamic loads.

 

Chemical Composition: High levels of Chromium (22%), Molybdenum (3%), and Nitrogen (0.18%) provide passivation and corrosion protection.

 

Versatility: Performs well in both oxidizing and reducing conditions, and its ferrite phase provides good caustic resistance.