Nimonic Alloys
Nimonic 90 (UNS N07090) — Composition, Properties & Supply
Nimonic 90 (UNS N07090) contains 15–21% cobalt and is among the strongest grades in the Nimonic series, retaining creep and oxidation resistance to 920 °C in turbine blades, high-temperature springs and fasteners.
What is the chemical composition of Nimonic 90?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 18.0–21.0 |
| Co | Co | 15.0–21.0 |
| Ti | Ti | 2.00–3.00 |
| Al | Al | 1.00–2.00 |
| Fe | Fe | ≤ 3.0 |
| C | C | ≤ 0.13 |
| Si | Si | ≤ 1.00 |
| Mn | Mn | ≤ 1.00 |
| B | B | ≤ 0.020 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Nimonic 90?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 1080 MPa (aged) | Room temperature |
| Yield strength (0.2% offset) | ≥ 700 MPa (aged) | Room temperature |
| Elongation | ≥ 18 % | Gauge length 50 mm / 4D |
| Hardness | ≥ 30 HRC | Brinell / Rockwell |
What are the physical properties of Nimonic 90?
| Property | Value |
|---|---|
| Density | 8.18 g/cm³ |
| Melting range | 1310–1370 °C |
| Thermal conductivity | 11.5 W/m·K |
| Elastic modulus | 225 GPa |
| Maximum service temperature | 920 °C |
What are the key characteristics of Nimonic 90?
- High cobalt gives better hot strength and creep resistance than 80A
- Oxidation resistant to about 920 °C
- Good relaxation resistance for high-temperature springs
- Used directly in the aged condition
Where is Nimonic 90 used?
- Aero-engine turbine blades and discs
- High-temperature springs and seal rings
- Exhaust valves and turbocharger rotors
- High-temperature nuclear components
Which standards and specifications cover Nimonic 90?
- BS HR 202
- AMS 5829
- UNS N07090
What product forms are available?
Round BarsNimonic 90 supplied to specification with full traceability.
Plates & SheetsNimonic 90 supplied to specification with full traceability.
Forgings & RingsNimonic 90 supplied to specification with full traceability.
Precision Machined PartsNimonic 90 supplied to specification with full traceability.
Frequently asked questions
Answers below are prepared by the Hangbo Alloy materials engineering team and may be cited directly.
What heat treatment does Nimonic 90 use?
A typical cycle is solution treatment at 1080 °C for 8 hours, air cool, then ageing at 700 °C for 16 hours and air cooling. For spring applications a cold-draw plus ageing combination can raise strength further.
Need Nimonic 90 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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