ASTM A790 S31803 Duplex Stainless Seamless Steel Pipe

ASTM A790 UNS S31803 (2205) is the most widely used duplex stainless steel seamless pipe, featuring a balanced ferritic-austenitic microstructure. It combines high strength, excellent pitting/crevice corrosion resistance, and superior stress corrosion cracking (SCC) resistance in chloride-rich environments.

• Common Name: 2205 Duplex Stainless Steel
• Material Grade: UNS S31803 / S32205
• Standard: ASTM A790 / ASME SA790
• Process: Hot-finished / Cold-drawn seamless
• Certification: EN 10204 3.1 / 3.2, PMI, NDT Certified

1 Chemical Composition (wt%, Max)

2 Mechanical Properties (Room Temp)

3 Dimensions & Range

• Nominal Size: 1/2" NB – 16" NB (OD 21.3mm – 406.4mm)
• Wall Thickness: SCH 5, 10, 40, 80, 160, XS, XXS
• Length: 5.8m / 6m or custom length (17–40 ft random lengths)
• Ends: Plain End (PE), Beveled End (BE), NPT Threaded

• Surface: Pickled, Sandblasted, Polished, BA, EP

   

Standard seaworthy export packaging to ensure safe delivery:
Bundle Packing: Pipes bundled with steel straps (6–12 pcs/bundle), marked with grade, size, heat number.
End Protection: Plastic caps (PE/BE ends) or thread protectors (NPT ends).
Moisture Barrier: Wrapped in waterproof kraft paper or plastic film.
Outer Packing: Plywood crates / wooden boxes for small sizes; steel frames for large diameters.
Marking: Each pipe stenciled with standard, grade, size, heat number, logo, and destination.

Key Features:

✅ Superior Corrosion Resistance: Resists pitting, crevice, and SCC in seawater, brines, and acidic media (PREN ≥ 35).
✅ High Mechanical Strength: ~2x yield strength of 316L, enabling thinner walls and cost savings.
✅ Cost-Effective: Lower nickel content than austenitic grades (e.g., 316L), offering stable pricing.
✅ Good Fabricability: Easy to weld, bend, and machine with proper procedures. 

Corronsion Resistance: Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localised corrosion including intergranular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35°C. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150°C. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water than grade 316.

Heat Resistance: Although 2205 has good high temperature oxidation resistance this grade, like other duplex stainless steels, suffers from embrittlement if held for even short times at temperatures above 300°C. If embrittled this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300°C.

》Oil & Gas
Offshore platforms, subsea pipelines, risers, flowlines
Wellhead equipment, downhole tubing, saltwater injection lines
》Chemical Processing
Heat exchangers, pressure vessels, reactor piping
Chloride-rich processes, bleach plants, acid handling systems
》Marine & Desalination
Seawater cooling lines, desalination plant piping (RO systems)
Shipbuilding, coastal infrastructure, ballast water systems
》Pulp & Paper
Digester lines, bleach washers, black liquor recovery systems
》Other
Food processing, pharmaceutical, power generation (FGD systems)

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