Duplex pipe
ASTM A790 S31803 (Duplex) — chemistry & properties
ASTM A790 S31803 (Duplex) (Duplex pipe, UNS S31803): chemical composition and mechanical properties. Duplex 2205 family for seawater, offshore and chemical plants.
Chemical composition (wt %)
| C | ≤ 0.03 |
| Mn | ≤ 2 |
| P | ≤ 0.03 |
| S | ≤ 0.02 |
| Si | ≤ 1 |
| Cr | 21 – 23 |
| Ni | 4.5 – 6.5 |
| Mo | 2.5 – 3.5 |
| N | 0.08 – 0.2 |
Mechanical properties
| Tensile strength, min | 620 MPa |
| Yield strength, min | 450 MPa |
| Elongation, min | 25 % |