Alloy 800H / Incoloy 800H
1.4958Iron-nickel-chromium alloy (Fe-32Ni-21Cr) with controlled carbon (0.05–0.10%) and grain size for optimized creep-rupture strength above 600°C. Solution-annealed: Rm ≥450 MPa, Rp0.2 ≥170 MPa, A ≥30%. Density 7.94 g/cm³, E-Modul 196 GPa. Excellent resistance to carburization, oxidation, and nitriding to 1100°C. UNS N08810, ASTM B407/B408/B409. Applications: ethylene cracking tubes, reformer furnace tubes, heat exchangers, nuclear steam generators, chemical reactors. Variant 800HT (N08811/1.4959) has tighter Al+Ti control for even higher creep strength.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | N08810 | — | % |
| 🇪🇺 | EN | Europe | X5NiCrAlTi31-20 | 1.4958 | % |
| 🇺🇸 | ASTM | USA | B407/B408/B409 | — | % |
| 🇺🇸 | Special Metals | USA | Incoloy 800H | — | % |
| 🇩🇪 | VDM | Germany | Nicrofer 3220 H | — | % |
| 🇸🇪 | Alleima | Sweden | Sanicro 31H | — | % |
Sources: SAE/ASTM, EN 10302, ASTM, specialmetals.com, vdm-metals.com, alleima.com
Mechanical properties — Pro
Solution-Annealed
| Property | Value | Unit |
|---|---|---|
| Density | ||
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Thermal Conductivity | ||
| thermal_expansion | ||
| specific_heat | ||
| max_use_temperature |
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