Duplex 2205 (UNS S32205) Seamless Pipes & Tubes
Duplex 2205 (UNS S32205) is the world's most widely used duplex stainless steel, with a balanced microstructure of approximately 50% ferrite and 50% austenite. It offers nearly double the yield strength of standard austenitic grades with superior corrosion resistance.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 160
Standards
4 specs
Chemical Composition (% by weight)
| C | Mn | Si | Cr | Ni | Mo | N | P | S |
|---|---|---|---|---|---|---|---|---|
| 0.030 max | 2.00 max | 1.00 max | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 0.030 max | 0.020 max |
Mechanical Properties (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 655 MPa min | 450 MPa min | 25% min | 31 HRC max |
Physical Properties - Duplex 2205
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 7.82 g/cm3 | 1350-1400 C | 19 W/m-K | 850 nOhm-m | 480 J/kg-K | 13.0 um/m-C |
Corrosion Resistance - Duplex 2205
| Property | Value |
|---|---|
| Pitting Resistance (PREN) | ~35 |
| Max Service Temp (Oxidizing) | 315 C (to avoid 475C embrittlement) |
| Intergranular Corrosion | Highly resistant |
| Stress Corrosion Cracking | Excellent resistance vs austenitic |
| General Corrosion Rate | <0.02 mm/yr in most environments |
| Seawater Resistance | Excellent up to 20C |
Equivalent International Grades
| ASTM | NORSOK | Trade |
|---|---|---|
| S32205/S31803 | MDS D45 | SAF 2205 |
Duplex 2205 vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| SS 316 / 316LAustenitic Stainless Steel | S31600 | 515 / 485 MPa min | 205 / 170 MPa min | ~24 | 870 C |
| Super Duplex 2507Super Duplex Stainless Steel | S32750 | 795 MPa min | 550 MPa min | >42 (typ. 42-44) | 315 C |
| Duplex 2304Lean Duplex Stainless Steel | S32304 | 600 MPa min | 400 MPa min | ~25 | 315 C |
Applicable Standards
Applications
Key Advantages of Duplex 2205
Duplex 2205 Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Primary grade for offshore platforms, subsea pipelines, and process piping. Specified by ADNOC, Saudi Aramco, QatarEnergy, and KOC.
Europe (Germany, UK, Norway, Netherlands, Italy)
NORSOK standard for North Sea operations. Widely used by Equinor, Shell, BP, and TotalEnergies.
United States
Standard duplex grade for offshore Gulf of Mexico, chemical processing, and desalination.
Frequently Asked Questions about Duplex 2205 Seamless Pipes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 160
Industries Served
Related Grades
Compare With
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Stancor is India's leading manufacturer of Duplex 2205 seamless pipes, exporting to UAE, Saudi Arabia, Qatar, Germany, UK, and USA. Contact our sales team for competitive pricing, fast delivery, and full material certification.