1.4547 (254 SMO)
1.4547 (254 SMO) is a 6-Mo super-austenite with very high chloride and pitting resistance (PREN > 40) – for seawater and the most aggressive chemicals.
Application & properties
1.4547 (254 SMO) is a 6-Mo super-austenite with very high chloride and pitting resistance (PREN > 40) – for seawater and the most aggressive chemicals.
- Seawater and offshore technology
- Flue-gas cleaning and desulphurisation
- Aggressive chloride-bearing media
Chemical composition
Typical values in wt.-% per EN standard (heat analysis).
| Element | Content (%) |
|---|---|
| C | ≤ 0.020 |
| Cr | 19.5–20.5 |
| Ni | 17.5–18.5 |
| Mo | 6.0–6.5 |
| N | 0.18–0.25 |
| Cu | 0.5–1.0 |
Mechanical properties
Typical values at room temperature per EN standard.
| Property | Value |
|---|---|
| Yield strength Rp0.2 | ≥ 300 MPa |
| Tensile strength Rm | 650–850 MPa |
| Elongation A | ≥ 35 % |
Standards, equivalents & product forms
| Topic | Detail |
|---|---|
| Standards | EN 10216-5, EN 10088 |
| ASME/ASTM equivalent | ~ UNS S31254 |
| Material no. | 1.4547 |
| Short name / aka | X1CrNiMoCuN20-18-7 · 254 SMO |
We supply 1.4547 (254 SMO) as pipes, flanges and fittings – seamless or welded, on request with an EN 10204 3.1 / 3.2 mill certificate.
Frequently asked questions about 1.4547 (254 SMO)
What does PREN > 40 mean for 254 SMO?
The high pitting resistance equivalent (PREN) describes pitting resistance – 254 SMO is thus highly chloride- and seawater-resistant.
Where is 1.4547 used?
In seawater, offshore and flue-gas cleaning plants.
Request 1.4547 (254 SMO)?
Grade, standard, size, pressure rating and quantity are enough – on request with an EN 10204 3.1 / 3.2 mill certificate. Your quote usually the same day.
All data are typical values per the relevant EN standards for first orientation – without warranty. The applicable standard and the mill certificate of the delivery are decisive.