Austenitic stainless
1.4550
TP 347
X6CrNiNb18-10
Niobium-stabilised austenitic (347). The niobium addition secures resistance to intergranular corrosion in the welded condition.
Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | ≤0.08 |
| SiSilicon | ≤1 |
| MnManganese | ≤2 |
| PPhosphorus | ≤0.04 |
| SSulphur | ≤0.015 |
| CrChromium | 17–19 |
| NiNickel | 9–12 |
| NbNiobium | 10×C – 1.0 |
Mechanical properties
room temperature- Rp0.2 min (N/mm²)
- 205
- Rp1.0 min (N/mm²)
- 240
- Rm (N/mm²)
- 510–740
- Elongation A% (longitudinal)
- 35
- Elongation A% (transverse)
- 30
- Impact energy KV J (longitudinal)
- 100
- Impact energy KV J (transverse)
- 60
Seamless tube.
Standard equivalences
- DIN/EN
- X6CrNiNb18-10
- AISI
- 347 / 348
- UNS
- S34700
- SS
- 2338
- AFNOR
- Z6 CNNb 18.10
- BS
- 347 S31
Typical applications
- Food and beverage equipment
- Tobacco, film and photographic industry
- Household goods
- Power-plant construction
Frequently asked questions
What is 1.4550 (TP 347)?
1.4550 (X6CrNiNb18-10) — Austenitic stainless. Niobium-stabilised austenitic (347). The niobium addition secures resistance to intergranular corrosion in the welded condition.
Which grades are equivalent to 1.4550?
1.4550 corresponds to EN X6CrNiNb18-10; equivalent designations: AISI 347 / 348, UNS S34700, SS 2338, AFNOR Z6 CNNb 18.10, BS 347 S31.
Related grades
Indicative values — verify against the applicable standard before specifying.
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