GH2132 (A-286) is the high-strength iron-nickel superalloy of choice for jet engine fasteners, while Inconel 718 is the gold standard for the most demanding, highest-temperature aerospace forgings. This guide compares them head-to-head.
1. Chemical Composition Comparison (%)
| Element | GH2132 / A-286 (UNS S66286) | Inconel 718 (UNS N07718) |
|---|---|---|
| Iron (Fe) | Balance | Balance |
| Nickel (Ni) | 24.0 – 27.0 | 50.0 – 55.0 |
| Chromium (Cr) | 13.5 – 16.0 | 17.0 – 21.0 |
| Molybdenum (Mo) | 1.0 – 1.5 | 2.80 – 3.30 |
| Titanium (Ti) | 1.9 – 2.35 | 0.65 – 1.15 |
| Aluminum (Al) | ≤0.35 | 0.20 – 0.80 |
| Vanadium (V) | 0.1 – 0.5 | — |
| Niobium (Nb) | — | 4.75 – 5.50 |
2. Mechanical Properties (Typical, Aged)
| Property | A-286 | Inconel 718 |
|---|---|---|
| Tensile Strength (MPa) | ≥895 | ≥1240 |
| Yield Strength 0.2% (MPa) | ≥586 | ≥1034 |
| Elongation (%) | ≥15 | ≥12 |
| Max Service Temp | ~650°C | ~700°C |
3. Key Technical Differences
- Strength: 718 offers significantly higher yield strength and creep resistance; A-286 is roughly 70% as strong.
- Cost: A-286 is far more economical, making it the default for aerospace fasteners.
- Temperature: 718 retains strength to higher temperatures and sees more severe turbine environments.
- Applications: A-286 for bolts, studs, and turbine housings; 718 for discs, shafts, and critical rotating parts.
5. Key Application Areas
GH2132 (A-286) application areas
- Aircraft engine fasteners, bolts, and studs
- Gas turbine compressor housings and seals
- High-temperature automotive turbocharger components
- Industrial fasteners for continuous service up to 650°C
Inconel 718 application areas
- Turbine discs, shafts, and rotating components
- Rocket engine and liquid-fuel propulsion parts
- High-strength aerospace fasteners and landing gear
- Oil & gas downhole tools and high-strength bolts
Frequently asked questions
Why is A-286 so common in aircraft engines?
It offers an excellent strength-to-cost ratio up to 650°C and is the standard material for jet engine fasteners.
Can A-286 replace 718?
Only in lower-stress, lower-temperature applications; 718 is required for high-stress turbine discs.
Is 718 harder to machine?
Yes. 718 work-hardens aggressively and requires rigid tooling and slow speeds.
Which has better creep resistance?
Inconel 718, due to its higher Ni content and gamma double prime strengthening.
Are both precipitation hardened?
Yes. A-286 relies on gamma prime (Ti/Al); 718 on gamma double prime (Nb-rich).
Does Hangbo supply both alloys?
Yes, in bar, forging, and custom-machined forms with full MTRs.