ASTM A789 S32205 Duplex Steel Tube For Oil And Gas Industry
ASTM A789 S32205 (UNS S32205) duplex stainless steel tube
1. Brief introduction
ASTM A789 S32205 (UNS S32205) duplex steel tubes are high-performance tubular products designed for extreme environments requiring exceptional strength and corrosion resistance. With a balanced microstructure of 50% austenite and 50% ferrite, these pipes deliver yield strength up to 450 MPa – twice that of standard 316L stainless steel – while maintaining excellent toughness across temperatures ranging from -50°C to 300°C.
2. Chemical composition (ASTM A789 standard)
| element | Content (wt.%) |
|---|---|
| Cr | 22.0 - 23.0 |
| Ni | 4.5 - 6.5 |
| Mo | 3.0 - 3.5 |
| N | 0.14 - 0.20 |
| Mn | ≤2.00 |
| Si | ≤1.00 |
| C | ≤0.030 |
| P | ≤0.030 |
| S | ≤0.020 |
3. International equivalent brand of ASTM A789 S32205
| standard | Brand |
|---|---|
| UNS | S32205 |
| EN | 1.4462 (X2CrNiMoN22-5-3) |
| DIN | W. Nr 1.4462 |
| GB/T | 022Cr22Ni5Mo3N |
| JIS | SUS329J3L |
4. Mechanical properties (solution annealed state)
| Properties | Numeric |
|---|---|
| Tensile strength (Rm) |
≥620 MPa |
| Yield strength (Rp0.2) |
≥450 MPa |
| Elongation (A50mm) |
≥25% |
| Hardness (HBW) | ≤290 |
5. Application fields of ASTM A789 S32205 Duplex Steel Tube
- Marine engineering: high-pressure pipelines for desalination equipment, submarine oil pipelines, marine pump and valve systems
- Petrochemical energy: acidic oil and gas pipelines, LNG heat exchangers, H₂S/CO₂ medium treatment equipment
- Environmental protection equipment: flue gas desulfurization (FGD) system spray pipes, wastewater treatment reactors
- Chemical manufacturing: acetic acid, urea synthesis towers, high-temperature chloride medium containers
- Building structures: salt spray resistant structural parts for coastal buildings, bridge cable anchoring systems
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.