2205 Duplex Stainless Steel Pipe Tubing High Strength For Oil And Gas Applications
2205 duplex stainless steel pipe is a nitrogen-enhanced duplex grade with a two-phase microstructure consisting of approximately 50% austenite and 50% ferrite. This balanced structure provides approximately twice the yield strength of standard austenitic stainless steels such as 304 and 316, combined with excellent corrosion resistance.
2205 is the most widely used duplex stainless steel grade, offering an exceptional combination of high strength, good weldability, and superior resistance to stress corrosion cracking, pitting, and crevice corrosion.
| Parameter | Details |
|---|---|
| Standard | ASTM A790, A789, ASME SA790, EN 10216-5, EN 10217-7 |
| Grade | 2205 (UNS S31803, UNS S32205) |
| Size (OD) | 6.0 mm – 610 mm (1/8" – 24") |
| Wall Thickness | 0.5 mm – 25.0 mm |
| Length | 3000 mm, 6000 mm, random lengths (custom cut available) |
| Process | Seamless (cold drawn / cold rolled) or Welded (ERW / EFW) |
| Surface Finish | Mill finish, Pickled, Annealed, Polished |
| Element | UNS S31803 | UNS S32205 |
|---|---|---|
| Carbon (C) | ≤ 0.030 | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 | ≤ 0.020 |
| Chromium (Cr) | 21.0 – 23.0 | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 | 3.0 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 | 0.14 – 0.20 |
| Iron (Fe) | Balance | Balance |
UNS S32205 has tighter compositional limits than UNS S31803, providing improved corrosion resistance and consistency.
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa (≥ 90 ksi) |
| Yield Strength (0.2% offset) | ≥ 450 MPa (≥ 65 ksi) |
| Elongation | ≥ 25% |
| Hardness (Brinell) | ≤ 290 HB |
| Hardness (Rockwell C) | ≤ 30 HRC |
| Impact Strength (Charpy V-notch) | ≥ 100 J at -40°C |
Note: The values above are for reference only. Please refer to the mill test certificate for actual data.
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Modulus of Elasticity | 200 GPa (29,000 ksi) |
| Thermal Conductivity (100°C) | 19 W/m·K |
| Specific Heat (0-100°C) | 500 J/kg·K |
| Electrical Resistivity | 850 μΩ·m |
| Magnetic Permeability | Magnetic (ferritic phase) |
- High Strength – Approximately twice the yield strength of 304/316 stainless steel
- Excellent Pitting Resistance – PREN (Pitting Resistance Equivalent Number) of 33-35
- Stress Corrosion Cracking Resistance – Superior resistance to chloride SCC
- Good Weldability – Can be welded using standard methods with proper filler metals
- High Thermal Conductivity – Better heat transfer than austenitic grades
- Low Thermal Expansion – Similar to carbon steel, reducing thermal stress issues
- Cost Effective – Allows for wall thickness reduction of 30-50% compared to austenitic grades
| Process | Recommendation |
|---|---|
| Welding | Use matching filler metal (2209). Control heat input (0.5-2.5 kJ/mm). Avoid overheating. |
| Bending | Minimum bend radius of 3x OD for cold bending. Use mandrel for tight radii. |
| Cutting | Use abrasive saw or cold saw. Avoid thermal cutting to prevent intergranular corrosion. |
| Machining | Use rigid tooling and positive rake angles. Lower speeds and higher feeds than austenitic. |
| Heat Treatment | Solution anneal at 1040-1100°C followed by water quenching. |
Have a project that demands the strength and corrosion resistance of 2205 duplex?
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.