Nimonic 90
2.4632Precipitation-hardened Ni-Cr-Co superalloy — Ti+Al for gamma-prime strengthening. Creep-resistant to 920°C (higher than Nimonic 80A at ~815°C). Co 15-21% for solid-solution strengthening. Used for gas turbine blades, turbine discs, exhaust re-heaters, high-temp springs, and motorsport engine valves. Also hot-working tools.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N07090 | N07090 | REF |
| 🇪🇺 | EN | Europe | NiCr20Co18Ti / 2.4632 | 2.4632 | 100% |
Sources: AMS 5829, EN
Chemical composition comparison (wt%)
Side-by-side: Nimonic 90 (UNS) (AMS 5829) vs NiCr20Co18Ti / 2.4632 (EN)
| Element | Nimonic 90 (UNS) | NiCr20Co18Ti / 2.4632 (EN) | Overlap |
|---|---|---|---|
| C | 0.04–0.13% | — | — |
| Cr | 18–21% | — | — |
| Ni | — | — | — |
| Al | 1–2% | — | — |
| Ti | 2–3% | — | — |
| Co | 15–21% | — | — |
| Fe | 0–1.5% | — | — |
Mechanical properties
Aged
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 850–1100 | MPa |
| Yield Strength | 400–800 | MPa |
| Elongation | 15–30 | % |
| Elastic Modulus | ≥ 213 | GPa |
| Density | ≥ 8.18 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treatment | 1050–1100 °C | air | 8h | Dissolve gamma-prime |
| aging | 700–750 °C | air | 16h | Gamma-prime precipitation |
Compatibility verdict
Nimonic 90 and NiCr20Co18Ti / 2.4632: 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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