Nimonic 90: precipitation-hardenable nickel-chromium-cobalt superalloy offering high stress-rupture strength and creep resistance up to 920°C (1688°F), good oxidation resistance, age-hardenable gamma prime strengthening, and excellent high-temperature spring performance for turbine blades, discs, fasteners, and springs. UNS N07090. W.N.r 2.4632. AMS 5829.
Nimonic 90 is a precipitation-hardenable nickel-chromium-cobalt alloy developed for applications requiring high stress-rupture strength and creep resistance at elevated temperatures up to 920°C (1688°F) . It is a well-proven superalloy widely used in high-temperature conditions, particularly in gas turbine engines and aerospace components .
The alloy’s unique composition—featuring chromium (18-21%) and cobalt (15-21%) with titanium and aluminum additions—enables the formation of gamma prime (γ’) precipitates during heat treatment, which provide exceptional high-temperature strength. Nimonic 90 offers superior performance to Nimonic 80A, particularly at higher temperatures, while maintaining good resistance to oxidation and hot corrosion .
Nimonic 90 is available in a wide range of product forms including wire, bar, sheet, strip, plate, and tube, and is suitable for both high-temperature static and dynamic applications .
UNS | EN | C | Si | Mn | P | S | Cr | Ni | Fe | Cu | Ti | Al | Co | Other | |
N07090 | 0.13 | 0.8 | 0.4 | 0.02 | 0.15 | 18-21 | rest | <1.5 | <0.2 | 2-3 | 1-2 | 15-21 | B<0.02 | ||
0.1 | 1 | 1 | 0.02 | 0.15 | 27-30 | rest | <1 | <0.5 | 1.9-2.7 | 0.9-1.5 | 19-21 | Nb0.4-1.1 | |||
Comparison Table: Nimonic 75 Nimonic 80A Nimonic 90
| Element (wt%) | Nimonic 75 (UNS N06075) | Nimonic 80A (UNS N07080) | Nimonic 90 (UNS N07090) |
|---|---|---|---|
| Nickel (Ni) | Balance (~80% min) | Balance (~69%) | Balance (~54%) |
| Chromium (Cr) | 18.0 – 21.0 | 18.0 – 21.0 | 18.0 – 21.0 |
| Cobalt (Co) | — | 2.0 max | 15.0 – 21.0 |
| Titanium (Ti) | 0.2 – 0.6 | 1.8 – 2.7 | 2.0 – 3.0 |
| Aluminum (Al) | — | 1.0 – 1.8 | 1.0 – 2.0 |
| Iron (Fe) | 5.0 max | 3.0 max | 1.5 max |
| Carbon (C) | 0.08 – 0.15 | 0.10 max | 0.13 max |
| Silicon (Si) | 1.0 max | 1.0 max | 1.0 max |
| Manganese (Mn) | 1.0 max | 1.0 max | 1.0 max |
| Copper (Cu) | 0.5 max | 0.2 max | 0.2 max |
| Boron (B) | — | 0.008 max | 0.02 max |
| Zirconium (Zr) | — | 0.15 max | 0.15 max |
| Lead (Pb) | — | 0.0025 max | 0.0020 max |
| Sulfur (S) | — | 0.015 max | 0.015 max |
