1.4547 pipes – 254 SMO stainless steel pipes EN 10216-5
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. ROHRLINE supplies 1.4547 pipes and tubes to EN 10216-5 and EN 10217-7 with EN 10204 3.1 inspection certificates – worldwide.
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
Tell us the medium, temperature and pressure – we will check the grade with you.
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 | 6.0–7.0 |
| 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 (seamless), EN 10217-7 (welded), 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.
Supply programme & machining
| Item | Details |
|---|---|
| Dimensions (pipe) | Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard |
| As flange & fitting | DN 10 to DN 1200 · PN 6 to PN 400 · Class 150 to Class 2500 to ASME B16.5 (to NPS 24), above that ASME B16.47 to Class 900 |
| Lengths & cutting | Mill lengths, sawn fixed lengths and fitting pieces from 0.1 to 12 m – sawn and bevelled |
| Minimum quantity | From a single item – from one fitting piece to the complete piping system |
| Availability | Common grades and sizes available at short notice, special sizes procured per project |
| Lead time | Standard sizes usually 3–5 working days; the binding date is confirmed with the quote |
| Machining | Sawing and bevelling, roll grooving for grooved couplings, threading to EN 10226, drilling, facing, bending with special radii |
| Surface | Blasting, coating and marking to customer specification |
| Certificates | Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request |
| Testing | Non-destructive testing by ultrasound, eddy current and X-ray, pressure test report on request |
These figures describe our supply programme. Which size is actually available in this grade is clarified with your enquiry – you usually receive the quote the same day.
We clarify availability, price and inspection certificate with your enquiry.
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.
Which dimensions and certificates does ROHRLINE supply for 1.4547?
ROHRLINE supplies 1.4547 in the following range: Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard. Documentation: Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request. Delivery worldwide; the binding date is confirmed with the quotation.
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.