Inconel 617
2.4663Nickel-chromium-cobalt-molybdenum alloy for the highest temperature service of any Inconel — continuous use to 1000°C+. Unique combination of high-temperature strength, oxidation resistance, and carburization resistance. 12% Co for solid-solution strengthening at extreme temperature. ASME Code Case N-47-28 for nuclear service to 950°C. Used for gas turbine combustors, petrochemical reformer tubes, catalyst grid supports, and next-generation nuclear heat exchangers (VHTR).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N06617 | N06617 | REF |
| 🇪🇺 | EN | Europe | NiCr22Co12Mo / 2.4663 | 2.4663 | 100% |
Sources: ASTM B168, EN 10095
Chemical composition comparison (wt%)
Side-by-side: Inconel 617 (UNS) (ASTM B168) vs NiCr22Co12Mo / 2.4663 (EN)
| Element | Inconel 617 (UNS) | NiCr22Co12Mo / 2.4663 (EN) | Overlap |
|---|---|---|---|
| C | 0.05–0.15% | — | — |
| Cr | 20–24% | — | — |
| Mo | 8–10% | — | — |
| Ni | ≥ 44.5% | — | — |
| Al | 0.8–1.5% | — | — |
| Ti | 0–0.6% | — | — |
| Co | 10–15% | — | — |
| Fe | 0–3% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 655–760 | MPa |
| Yield Strength | 240–310 | MPa |
| Elongation | 30–50 | % |
| Elastic Modulus | ≥ 211 | GPa |
| Density | ≥ 8.36 | g/cm3 |
Compatibility verdict
Inconel 617 and NiCr22Co12Mo / 2.4663: 100% composition match
Close equivalents but NOT identical.
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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