- Nimonic 90 Rod High Temperature Nickel
Nimonic 90 Rod is developed by replacing 20% of Ni in Nimonic-80A with cobalt. The addition of cobalt increases the solid solubility temperature of γ′. It also increases the solubility of carbon in the matrix and therefore influences the characteristics of carbide precipitation. The carbide dissolution temperature is lowered to about 900°C. Cobalt is a γ′ stabilizer and therefore imparts better high temperature strength. Both MC type and M23C6 type carbides are present in this material. The physical metallurgy of Nimonic alloys is given in ref. and the hot ductility studies are in refs.
Nimonic 90 is also known as Superimphy 90, Pyromet 90, and Udimet 90.
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Nimonic 90 Rod Chemical Composition
The chemical composition of Nimonic 90 rod is given in the following table.
| Element | Content (%) |
| Nickel, Ni | Bal |
| Chromium, Cr | 18-21 |
| Iron, Fe | ≤1.5 |
| Cobalt, Co | 15-21 |
| Titanium, Ti | 2-3 |
| Aluminum, Al | 1.0-2.0 |
| Manganese, Mn | ≤1 |
| Silicon | ≤1 |
| Others | Remainder |
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Nimonic 90 Rod Physical Properties
The following table discusses the physical properties of Nimonic 90 Rod.
| Properties | Metric | Imperial |
| Density | 8.18 gm/cm3 | 0.296 lb/in3 |
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Nimonic 90 Rod Mechanical Properties
The mechanical properties of Nimonic 90 Rod are tabulated below.
| Properties |
| Condition | Approx. tensile strength | Approx. operating temperature depending on load^^ and environment |
| N/mm² | ksi | °C | °F |
| Annealed | 800 – 1000 | 116 – 145 | – | – |
| Annealed + Aged | 1200 – 1400 | 174 – 203 | up to 550 | up to 1020 |
| Spring Temper | 1200 – 1500 | 175 – 218 | – | – |
| Spring Temper + Aged | 1500 – 1800 | 218 – 261 | up to 350 | up to 660 |
