1. Duplex Steel Uns S31803 Pipe Corossion Resistance:

• Due to its high chromium, molybdenum, and nitrogen content, Duplex 2205 demonstrates superior corrosion resistant properties to 316 and 316L in most environments
• Chromium, molybdenum, and nitrogen content also provide high resistance to pitting and crevice corrosion, even in oxidizing and acidic solutions
• Resistant to chloride stress corrosion cracking and temperatures of up to about 302°F (150°C)
• The presence of ferrite provides for good performance of Duplex 2205 in caustic environments

2. Duplex Steel Uns S31803 Pipe Heat Resistance:

• Similar to other duplex stainless steels, Duplex 2205 has good oxidation resistance at high temperatures
• Subject to embrittlement when exposed to temperatures above 572°F (300°C) even when exposed for short periods of time; Duplex 2205 is therefore not recommended for use above 572°F (300°C)

3. Duplex Steel Uns S31803 Pipe Welding Characteristics:

• Possesses good weldability
• Should not generally be welded without filler metal as this may result in excessive ferrite

4.Duplex Steel Uns S31803 Pipe Heat Treatment:

• Annealing temperature range is 1868 to 2012°F (1020 to 1100°C)
• Cannot be hardened by heat treatment – but Duplex 2205 does work-harden
• Special consideration is needed to compensate for a higher coefficient of thermal expansion to avoid warping and distortion