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Product Overview
UNS S31803 is the original Duplex stainless steel specification. It has a microstructure consisting of approximately equal amounts of austenite and ferrite, providing a unique combination of high strength and excellent corrosion resistance. Often referred to as Duplex 2205, it contains 22% Chromium, 3% Molybdenum, and 5-6% Nickel. This grade is highly effective in environments containing chlorides and hydrogen sulfide, making it a preferred choice for oil and gas extraction and chemical processing. Steel Emporium provides UNS S31803 pipes in both seamless and welded conditions with high-precision manufacturing.
Key Advantages & Features
High Yield Strength
Double the yield strength of standard austenitic stainless steels like 316L.
SCC Resistance
Exceptional resistance to Chloride Stress Corrosion Cracking (SCC).
Thermal Expansion
Lower thermal expansion coefficient than standard austenitic steels.
| Grade | C | Mn | Si | Cr | Ni | Mo | N | P | S |
|---|---|---|---|---|---|---|---|---|---|
| UNS S31803 | 0.030 max | 2.00 max | 1.00 max | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 | 0.030 | 0.020 |
| Property | Value (UNS S31803) |
|---|---|
| Tensile Strength (MPa) min | 620 MPa (90 ksi) |
| Yield Strength 0.2% Offset (MPa) min | 450 MPa (65 ksi) |
| Elongation (% in 50mm) min | 25% |
| Hardness (Rockwell C) max | 31 HRC |
| PREN (Pitting Resistance Eq. No) | 31 min |
| Density (kg/m³) | 7800 |
| UNS | Werkstoff No. | JIS | EN Name | Common Name |
|---|---|---|---|---|
| S31803 | 1.4462 | SUS 329J3L | X2CrNiMoN22-5-3 | Duplex 2205 |
Industrial Applications
Oil & Gas
Production tubing and flowlines.
Chemical Processing
Tanks, vessels & heat exchangers.
Marine Industry
Seawater systems and desalination.
Pulp & Paper
Digesters and bleaching plants.
Effluent Handling
High chloride waste-water treatment.
Structural Piping
Bridges and load-bearing structures.