Applications
seawater handling, chemical processing, pulp & paper, desalination.
MATERIALSMO 254Stainless steel
STAINLESS STEEL1.4547UNS S31254
MATERIAL DATASHEET
SMO 254 (UNS S31254 / EN 1.4547)
Super-austenitic stainless steel (~6% Mo, N alloyed) with very high pitting & crevice corrosion resistance.
Standards & designations
| Designation | Reference |
|---|---|
| UNS | S31254 |
| Werkstoff Nr. | 1.4547 |
| ASTM | A240 (plate), A182 F44 (forgings), A479/A276 (bar) |
| ASME | SA240, SA182 F44, SA479/SA276 |
| EN/ISO | EN 10088-3 (1.4547) |
| Others | X1CrNiMoCuN20-18-7 |
Mechanical properties
| Property | Value / condition |
|---|---|
| Yield strength Rp0.2 | ≥ 300–310 MPa (min) |
| Tensile strength Rm | ≥ 650 MPa (min) |
| Elongation | ≥ 35 % |
| Hardness | ≤ 270 HB (typ.) |
Chemical composition
Weight %
| Element | Cr | Ni | Mo | N | C | Mn | Si | P | S | Cu | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 19.5 | 17.5 | 6.0 | 0.18 | – | – | – | – | – | 0.50 | bal. |
| Max | 20.5 | 18.5 | 6.5 | 0.22 | 0.02 | 1.0 | 0.8 | 0.03 | 0.01 | 1.0 | bal. |
Applications & processing
Heat treatment
Solution anneal ~ 1150–1200 °C; rapid quench.
Weldability
Good.
The information in this datasheet is provided for guidance only. Intermec AS does not guarantee the accuracy or completeness of the data. Users must verify suitability for their specific applications.