Alloy 800H / Incoloy 800H vs Inconel 718: 24% composition overlap. Significantly different materials serving different application areas.
Alloy 800H / Incoloy 800H vs Inconel 718
Side-by-side chemical composition and mechanical property comparison.
Overview
Alloy 800H / Incoloy 800H
1.4958
Iron-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.
Inconel 718
2.4668
THE most widely used aerospace superalloy. Precipitation-hardened Ni-Cr-Fe alloy strengthened by gamma-prime and gamma-double-prime phases (Nb). Unique slow aging kinetics allow welding without cracking. UTS >1275 MPa aged. Used for gas turbine discs, jet engine components, rocket motors, cryogenic tanks, and oil/gas downhole tools. Service to 700°C.
| Alloy 800H / Incoloy 800H | Inconel 718 | |
|---|---|---|
| Material Number | 1.4958 | 2.4668 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | EN 10302 / ASTM B407 | ASTM B637 |
Chemical composition (wt%)
| Element | Alloy 800H / Incoloy 800H | Inconel 718 | Overlap |
|---|---|---|---|
| C | 0.05–0.1% | 0–0.08% | Partial |
| Si | ≤ 1% | 0–0.35% | OK |
| Mn | ≤ 1.5% | 0–0.35% | OK |
| Cr | 19–23% | 17–21% | Partial |
Mechanical properties
| Property | Alloy 800H / Incoloy 800H | Inconel 718 | Unit |
|---|---|---|---|
| density | ≥ 7.94 | ≥ 8.19 | g/cm3 |
| tensile_strength | ≥ 450 | ≥ 1275 | MPa |
| yield_strength | ≥ 170 | ≥ 1034 | MPa |
Compatibility Assessment
Alloy 800H / Incoloy 800H and Inconel 718 have significantly different compositions (24% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Alloy 800H / Incoloy 800H the same as Inconel 718?
Alloy 800H / Incoloy 800H and Inconel 718 have a 24% composition overlap. They are generally not directly interchangeable.
Can I replace Alloy 800H / Incoloy 800H with Inconel 718?
Generally not recommended. The compositions differ significantly (24% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Alloy 800H / Incoloy 800H and Inconel 718?
The main differences are in the following elements: C, Cr, Ni, Ti. Alloy 800H / Incoloy 800H is a Nickel Alloys grade, while Inconel 718 is a Nickel Alloys grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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