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
Mechanical properties
Compatibility verdict
Inconel 617 and NiCr22Co12Mo / 2.4663: 100% composition match
Related materials
Inconel 625
2.4856Nickel-chromium-molybdenum-niobium superalloy. Solid-solution strengthened (no precipitation hardening required). Outstanding corrosion resistance from cryogenic to 982°C. Used for jet engine exhaust systems, marine components, chemical processing, flare stacks, and nuclear applications.
Hastelloy C-276
2.4819The most versatile corrosion-resistant alloy available. Ni-Mo-Cr-W composition resists both oxidizing and reducing environments. Outstanding resistance to pitting, stress corrosion cracking, and wet chlorine gas. Used in chemical processing, flue gas desulfurization, pulp & paper, and waste treatment.
Monel 400
2.4360Nickel-copper alloy with excellent resistance to seawater, hydrofluoric acid, and alkaline environments. One of the few alloys resistant to HF acid at all concentrations. Used for marine engineering, chemical processing, oil refinery piping, and valve/pump components.
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