Austenitic heat-resistant
1.4958
Alloy 800H
X5NiCrAlTi31-20
Controlled-chemistry, high-temperature grade of Alloy 800 (800H) with enhanced creep-rupture strength for high-temperature plant.
Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | 0.03–0.08 |
| SiSilicon | ≤0.7 |
| MnManganese | ≤1.5 |
| PPhosphorus | ≤0.015 |
| SSulphur | ≤0.01 |
| CrChromium | 19–22 |
| NiNickel | 30–32.5 |
| NbNiobium | ≤0.1 |
| TiTitanium | 0.2–0.5 |
| AlAluminium | 0.2–0.5 |
Mechanical properties
room temperature- Scaling temperature (°C)
- 1100
Standard equivalences
- DIN/EN
- X5NiCrAlTi31-20
- AISI
- Alloy 800H
- UNS
- N08810
- AFNOR
- Z8 NC 33-21
- BS
- NA 15
- Silicon value on the source datasheet is ambiguously printed; shown here as 0.7% max.
Typical applications
- Power plants and reactors
- Heat-treatment plant (tubes, muffles, baskets)
- Industrial furnaces
- Chemical/petrochemical pressure vessels and boilers
- Coal gasification, waste incineration
Frequently asked questions
What is 1.4958 (Alloy 800H)?
1.4958 (X5NiCrAlTi31-20) — Austenitic heat-resistant. Controlled-chemistry, high-temperature grade of Alloy 800 (800H) with enhanced creep-rupture strength for high-temperature plant.
Which grades are equivalent to 1.4958?
1.4958 corresponds to EN X5NiCrAlTi31-20; equivalent designations: AISI Alloy 800H, UNS N08810, AFNOR Z8 NC 33-21, BS NA 15.
Related grades
Indicative values — verify against the applicable standard before specifying.
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