Nimonic 90* Specification
*Trade name of Special Metals Group of Companies
- W.NR 2.4632
- W.NR 2.4969
- UNS N07090
- AWS 030
Applicable Standards:
- BS HR 501 (Spring temper)
- BS HR 502 (Solution Annealed)
- BS HR 503
- BS 3075 NA19
- AMS 5829
- NCK20TA
- NACE MR0175 / ISO 15156-3
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.
| Good Mechanical Properties at Elevated Temperatures | Yes |
| Corrosion Resistant at Ambient Temperatures | No |
| Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures | No |
| Oxidation Resistant | Yes |
| Precipitation Hardenable | Yes |
Applications include:
- Aerospace industry
- High temperature springs
- Thermal processing
| Approximate Chemical Composition | |
| Ni | 54% |
| Cr | 18 - 21% |
| Co | 15 - 21% |
| Ti | 2 - 3% |
| Al | 1 - 2% |
| Properties | |||
| DENSITY | 8.18 g/cm3 | 0.296 lb/in3 | |
| MELTING POINT | 1370oC | 2500oF | |
| 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 |
*Spring Temper + Aged **Spring Temper + 3 Part Heat Treated
| CONDITION OF SUPPLY | HEAT TREATMENT (AFTER FORMING) |
| Solution Annealed | Age harden at 750oC (1380oF) for 4 hours and air cool. |
| Spring Temper | Age harden at 650oC (1200oF) for 4 hours and air cool. |
| Spring Temper | Age harden at 600oC (1110oF) for 16 hours and air cool. |
| CONDITION | APPROX TENSILE STRENGTH | APPROX SERVICE TEMPERATURE | ||
| Solution Annealed | 800 - 1000 N/mm2 | 116 - 145 ksi | - | - |
| Solution Annealed + Aged | 1300 - 1400 N/mm2 | 189 - 203 ksi | up to 550oC | up to 1020oF |
| Spring Temper | 1300 - 1500 N/mm2 | 189 - 218 ksi | - | - |
| Spring Temper + Aged | 1500 - 1800 N/mm2 | 218 - 261 ksi | up to 350oC | up to 660oF |
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