Duplex steel is a type of stainless steel that has a two-phase microstructure consisting of both austenitic and ferritic grains. It offers excellent strength, corrosion resistance, and high durability. There are several grades of duplex steel, each with its unique properties that make them suitable for specific applications. Here is a brief description of duplex steel products with grades.
| Eurorm | UNS | BS | En | Grade |
|---|---|---|---|---|
| 1.4462 | S31803 S32205 |
318S13 | - | 2205 |
| 1.4507 | S32530 S32550 |
- | - | UR52N+ |
| % | 2205 | UR52N+ |
|---|---|---|
| C | 0 - 0.03 | 0.03 max |
| Mn | 2.0 | 1.5 |
| Si | 1.0 | 0.8 |
| P | 0 - 0.03 | 0.035 |
| S | 0 - 0.02 | 0.02 |
| Cr | 21 - 23 | 24 - 26 |
| Mo | 2.5 - 3.5 | 3.0 - 5.0 |
| Ni | 4.5 - 6.5 | 5.5 - 8.0 |
| N | 0.08 - 0.2 | 0.2 - 0.35 |
| Cu | - | 0.5 - 3.0 |
| Grade | 2205 | UR52N+ |
|---|---|---|
| Tensile Strength (MPa) | ≥ 620 | ≥ 770 |
| Proof Stress 0.2% (MPa) | ≥ 450 | ≥ 550 |
| Elongation A5 (%) | ≥ 25 | ≥ 25 |