What Is AMS5663?
AMS5663 is an aerospace material specification developed by SAE International for precipitation-hardened nickel alloy Inconel 718 (UNS N07718). This specification is widely used for high-strength alloy bars, forgings, and rings intended for demanding aerospace, energy, marine, and industrial applications.
Inconel 718 is a nickel-chromium alloy known for its excellent combination of:
- High tensile strength
- Corrosion resistance
- Oxidation resistance
- Fatigue resistance
- Weldability
- Long-term structural stability
Because of these characteristics, AMS5663 material is commonly selected for components operating in high-temperature and high-pressure environments.
AMS5663 Equivalent Materials
AMS5663 is commonly associated with the following material designations:
| Standard | Equivalent Grade |
| UNS | N07718 |
| DIN/W.Nr | 2.4668 |
| Common Trade Name | Inconel 718 |
| Chinese Grade | GH4169 |
According to material information published by HQ Special Alloys, Inconel 718 is also supplied under specifications including ASTM B637, AMS 5662, AMS 5663, and AMS 5832.
Chemical Composition of AMS5663 Inconel 718
The alloy composition of Inconel 718 provides excellent mechanical properties and corrosion resistance across a wide temperature range.
Typical chemical composition includes:
| Element | Content (%) |
| Nickel + Cobalt | 50.0 – 55.0 |
| Chromium | 17.0 – 21.0 |
| Molybdenum | 2.8 – 3.3 |
| Niobium + Tantalum | 4.75 – 5.5 |
| Titanium | 0.65 – 1.15 |
| Aluminum | 0.2 – 0.8 |
| Iron | Balance |
These values are consistent with the material data published by HQ Special Alloys for Inconel 718 products.
Key Properties of AMS5663 Material
Excellent High-Temperature Strength
AMS5663 Inconel 718 maintains high tensile, creep, and fatigue strength at temperatures up to approximately 700°C. This makes it suitable for aerospace engines and gas turbine systems.
Outstanding Corrosion Resistance
The alloy demonstrates strong resistance to:
- Stress corrosion cracking
- Pitting corrosion
- Oxidation
- Marine atmospheric corrosion
Its nickel-chromium composition allows stable performance in harsh industrial environments.
Good Weldability
Unlike many precipitation-hardened superalloys, Inconel 718 offers good weldability and can be processed using:
- GTAW
- GMAW
- Resistance welding
- Electron beam welding
HQ Special Alloys notes that the alloy can be readily fabricated into complex components while maintaining reliable welding performance.
Cryogenic Performance
AMS5663 material also maintains stable mechanical properties at extremely low temperatures, making it suitable for cryogenic storage systems and aerospace fuel applications.
AMS5663 Heat Treatment
Inconel 718 supplied under AMS5663 is typically solution heat treated and age hardened.
The heat treatment process improves:
- Yield strength
- Tensile strength
- Fatigue resistance
- Structural stability
According to HQ Special Alloys, aviation-grade heat treatment systems are commonly used for Inconel 718 aerospace components.
Common Forms of AMS5663 Alloy
AMS5663 Inconel 718 is available in multiple product forms, including:
- Round bars
- Forged rings
- Flanges
- Sheets and plates
- Seamless tubes
- Welded pipes
- Welding wire
- Strip and coil
HQ Special Alloys supplies Inconel 718 in hot forged, hot rolled, and cold drawn conditions for different industrial requirements.
Applications of AMS5663 Inconel 718
Due to its exceptional mechanical performance, AMS5663 material is widely used in:
Aerospace Industry
- Aircraft engine components
- Turbine discs
- Compressor parts
- Rocket engine systems
- Exhaust systems
Energy Industry
- Gas turbines
- Nuclear power equipment
- Heat exchangers
- High-temperature fasteners
Oil and Gas Industry
- Downhole tools
- High-pressure valves
- Offshore equipment
Marine Engineering
Its corrosion resistance also makes Inconel 718 suitable for demanding marine and offshore environments.
Why Choose AMS5663 Inconel 718?
AMS5663 Inconel 718 combines:
- High strength
- Excellent corrosion resistance
- Good fabrication capability
- Stable high-temperature performance
- Reliable welding properties
These advantages make it one of the most widely used nickel-based super alloys for critical industrial applications.
