Austenitic stainless
1.4361
Alloy 18-15
X1CrNiSi18-15-4
High-silicon austenitic developed for highly concentrated nitric acid (above 95%) and concentrated sulphuric acid (from 98.5%).
Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | ≤0.015 |
| SiSilicon | 3.7–4.5 |
| MnManganese | ≤2 |
| PPhosphorus | ≤0.025 |
| SSulphur | ≤0.01 |
| NNitrogen | ≤0.11 |
| CrChromium | 16.5–18.5 |
| MoMolybdenum | ≤0.2 |
| NiNickel | 14–16 |
Mechanical properties
room temperature- Rp0.2 min (N/mm²)
- 220
- Rm (N/mm²)
- 530–730
- Elongation A% (longitudinal)
- 40
- Impact energy KV J (longitudinal)
- 100
- Impact energy KV J (transverse)
- 60
Transverse Rp0.2. Service range −50 to +350 °C.
Standard equivalences
- DIN/EN
- X1CrNiSi18-15-4
- UNS
- S01815
Typical applications
- Production, storage and transport of highly concentrated nitric acid
- Heat exchangers, piping, agitators, pumps and vessels
- Dissolution vessels in nuclear waste plant
- Piping and heat exchangers for concentrated sulphuric acid
Frequently asked questions
What is 1.4361 (Alloy 18-15)?
1.4361 (X1CrNiSi18-15-4) — Austenitic stainless. High-silicon austenitic developed for highly concentrated nitric acid (above 95%) and concentrated sulphuric acid (from 98.5%).
Which grades are equivalent to 1.4361?
1.4361 corresponds to EN X1CrNiSi18-15-4; equivalent designations: UNS S01815.
Related grades
Indicative values — verify against the applicable standard before specifying.
Request this grade