EN 1.4550 is a European stainless steel grade commonly used in the form of seamless and welded pipes for high-temperature and corrosive applications. Known for its excellent oxidation resistance and creep strength, EN 1.4550 is typically used in heat exchanger tubing, furnace parts, and chemical processing equipment.
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | X6CrNiNb18-10 |
| ASTM / AISI | 347 or 347H (UNS S34700 / S34709) |
| DIN | 1.4550 |
| JIS | SUS347 |
| GB (China) | 0Cr18Ni11Nb |
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Niobium (Nb) | ≥ 10 x C (min 1.0) |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.015 |
| Silicon (Si) | ≤ 1.0 |
316L (1.4404) does not contain niobium, and is less resistant to intergranular corrosion after welding. EN 1.4550 (347/347H) is used where high temperature strength and post-weld stability are critical.
Yes. EN 1.4550 is suitable for service up to 850°C, offering better creep resistance than 304 or 316 grades.
No. It is an austenitic stainless steel and is generally non-magnetic in the annealed condition.
Yes, it is accepted in EN 10216-5 and EN 13445 for pressure equipment in elevated temperature environments.
Standard: EN 10216-5 / ASTM A312 / A213
Type: Seamless / Welded Round Pipe
Size Range: 6mm – 610mm OD
Wall Thickness: 1mm – 30mm
Finish: Annealed & Pickled / Polished
End Type: Plain / Beveled / Threaded
Certification: EN 10204 3.1 / 3.2
We offer EN 1.4550 in standard product forms including tubes, pipes, plates, strips, sheets, round bars, flat bars, forgings, hexagonal bars and wires. These products are available in a wide variety of sizes. For detailed specifications and product information, please visit the following website.
Products: https://www.gneestainless.com/
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