Enhanced and consistent pitting corrosion resistance with PREN typically 36-38.
Higher guaranteed minimum nitrogen content (0.14-0.20%) for improved properties.
Excellent resistance to chloride stress corrosion cracking.
High mechanical strength: minimum yield strength 65 ksi (450 MPa).
Cost-effective for large diameter applications with consistent quality.
Duplex Steel S32205 welded pipe is the premium version of duplex 2205, manufactured to UNS S32205 specification with tighter chemical composition controls. With guaranteed minimum nitrogen content and optimized chromium, molybdenum, and nickel levels, S32205 offers enhanced and more consistent corrosion resistance compared to S31803. The welded construction provides reliable performance for critical applications in aggressive environments.
Typical Applications
Offshore oil & gas platform piping and umbilicals
Subsea pipelines and flowlines
Chemical reactor and column cladding
Seawater reverse osmosis (SWRO) high-pressure piping
Heat exchangers in chloride-containing media
FAQ – Duplex Steel S32205 Welded Pipe
Q1: Why choose S32205 over S31803 for critical applications?
A1: S32205’s tighter chemistry specifications, particularly minimum nitrogen content, ensure more consistent pitting corrosion resistance, mechanical properties, and weldability, reducing application risk in critical services.
Q2: What is the typical Critical Pitting Temperature (CPT)?
A2: S32205 typically exhibits CPT ≥ 35°C (95°F) per ASTM G150, making it suitable for most seawater and chloride applications. Actual values depend on specific heat chemistry and processing.
Q3: Can it be used for subsea applications?
A3: Yes, S32205 is widely used for subsea pipelines, manifolds, and Christmas trees due to its combination of strength, corrosion resistance, and compatibility with cathodic protection systems.
Q4: What post-weld heat treatment is required?
A4: Generally, full solution annealing is performed after welding to restore optimal microstructure. For thick sections, stress relief at 1100-1125°F (595-605°C) may be specified by certain codes or for dimensional stability.
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