Duplex 2205 ASTM A789 UNS S31803 seamless pipe

Corrosion Resistance

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.

Chemical Composition, %

What are the characteristics of Duplex 2205?

• High resistance to chloride stress corrosion cracking
• Resistance to chloride pitting and crevice corrosion
• Good general corrosion resistance
• Good sulfide stress corrosion resistance
• High Strength
• Good weldability and workability

In what applications is Duplex 2205 used?

• Chemical process vessels, piping and heat exchangers
• Pulp mill digesters, bleach washers, chip pre-steaming vessels
• Food processing equipment
• Oil field piping and heat exchangers
• Flue gas desulfurization equipment

ASTM Specifications

Mechanical Properties