Ferritic heat-resistant
1.4749 TP 446 X18CrN28
High-chromium nitrogen-bearing ferritic heat-resistant steel for sulphur-bearing gases at high temperature.
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Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | 0.15–0.2 |
| SiSilicon | ≤1 |
| MnManganese | ≤1 |
| PPhosphorus | ≤0.04 |
| SSulphur | ≤0.03 |
| CrChromium | 24–29 |
| NNitrogen | 0.14–0.18 |
Mechanical properties
room temperature- Scaling temperature (°C)
- 1100
Standard equivalences
- DIN/EN
- X18CrN28
- AISI
- 446
- UNS
- S44600
- SS
- 2322
- PN
- H25T
Typical applications
- High-temperature heat exchangers, muffle tubes, recuperators
- Cement, gypsum and glass works
- Smelters, copper, steel and aluminium works
Frequently asked questions
What is 1.4749 (TP 446)?
1.4749 (X18CrN28) — Ferritic heat-resistant. High-chromium nitrogen-bearing ferritic heat-resistant steel for sulphur-bearing gases at high temperature.
Which grades are equivalent to 1.4749?
1.4749 corresponds to EN X18CrN28; equivalent designations: AISI 446, UNS S44600, SS 2322, PN H25T.
Related grades
Indicative values — verify against the applicable standard before specifying.
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