A Nickel-Chromium-Cobalt alloy being precipitation hardenable, having high stress-rupture strength and creep resistance at high temperatures up to about 950oC (1740oF). It is widely used and a well proven alloy in high temperature conditions.
Nimonic® 90 is also known as Superimphy 90, Pyromet 90, and Udimet 90.
| Element | Min % | Max % |
| Ni | bal | |
| Cr | 18.00 | 21.00 |
| Fe | – | 1.50 |
| Ti | 2.00 | 3.00 |
| Mn | – | 1.0 |
| Si | – | 1.0 |
| C | – | 0.13 |
| Al | 1.00 | 2.00 |
| Co | 15.00 | 21.00 |
| S | – | 0.015 |
| Cu | – | 0.20 |
| B | – | 0.02 |
| Pb | – | 0.002 |
| Zr | – | 0.15 |
| Ag | – | 0.0005 |
| Bi | – | 0.0001 |
Density
8.18g/cm³ | 0.296 lb/in³
Melting Point
1370°C | 2500°F
Coefficient of Expansion
12.7 μm/m °C (20 – 100°C) | 7.1 x 10-6 in/in °F (70 – 212°F)
Modulus of Rigidity
82.5 kN/mm² | 11966 ksi
Modulus of Elasticity
213 kN/mm² 227 / 240 kN/mm² | 30894 ksi 32924 / 34810 ksi
Heat Treatment of Finished Parts
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Annealed | Age Harden | 750 | 1380 | 4 | Air |
| Spring Temper | Age Harden | 650 | 1200 | 4 | Air |
| Spring Temper | Age Harden | 600 | 1110 | 16 | Air |
Properties
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| 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 |