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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
