High-Temperature Alloys / Superalloys
GH4090 (Nimonic 90) (UNS N07090) — Composition, Properties & Supply
GH4090 is a Ni-Cr-Co precipitation-hardening superalloy (equivalent to British Nimonic 90). It offers high tensile and creep resistance at 815–870 °C with good oxidation and corrosion resistance and high fatigue strength under thermal cycling, for turbine blades, discs, high-temperature fasteners and springs.
What is the chemical composition of GH4090 (Nimonic 90)?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 18.0–21.0 |
| Co | Co | 15.0–21.0 |
| Ti | Ti | 2.0–3.0 |
| Al | Al | 1.0–2.0 |
| Fe | Fe | ≤ 1.5 |
| C | C | ≤ 0.13 |
| Si | Si | ≤ 1.0 |
| Mn | Mn | ≤ 1.0 |
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 GH4090 (Nimonic 90)?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 1080 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 690 MPa | Room temperature |
| Elongation | ≥ 15 % | Gauge length 50 mm / 4D |
| Hardness | 28–35 HRC | Brinell / Rockwell |
What are the physical properties of GH4090 (Nimonic 90)?
| Property | Value |
|---|---|
| Density | 8.18 g/cm³ |
| Melting range | 1310–1370 °C |
| Thermal conductivity | 11.5 W/m·K |
| Elastic modulus | 210 GPa |
| Maximum service temperature | 920 °C |
What are the key characteristics of GH4090 (Nimonic 90)?
- High strength and creep resistance at 815–870 °C
- γ′ (Ni₃(Al,Ti)) precipitation strengthening
- High fatigue strength under thermal cycling
- Good formability and weldability
Where is GH4090 (Nimonic 90) used?
- Gas turbine blades and discs
- High-temperature fasteners, clamps and seals
- Exhaust valves and springs
- Compressor and hot-section load-bearing parts
Which standards and specifications cover GH4090 (Nimonic 90)?
- GB/T 14992
- ASTM B637
- AMS 5829
What product forms are available?
Frequently asked questions
What is the typical heat treatment for GH4090?
Solution treatment at about 1080 °C for 8 h followed by air/oil cooling, then ageing at 700–720 °C for 16 h and air cooling.
Need GH4090 (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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