Inconel 690
2.4642High-chromium (27-31%) nickel alloy — THE nuclear PWR steam generator tube material, replacing Inconel 600 due to superior SCC resistance. Ni 58% min + Cr 30% = exceptional resistance to oxidizing media, nitric acid, and high-temperature atmospheres. Also used for coal gasification, radioactive waste processing, and sulfuric/hydrofluoric acid environments.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N06690 | N06690 | REF |
| 🇪🇺 | EN | Europe | NiCr29Fe / 2.4642 | 2.4642 | 100% |
Sources: ASTM B168, EN 10095
Mechanical properties
Compatibility verdict
Inconel 690 and NiCr29Fe / 2.4642: 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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