Inconel 718 (AMS 5662): Aerospace Superalloy Properties & Heat Treatment
AMS 5662 / ASTM B637 · Published: 2026-06-02 · Updated: 2026-06-02
Inconel 718 is the most widely used nickel superalloy in aerospace — ~35% of modern turbofan engine weight. Gamma-double-prime (Ni3Nb) precipitation hardening provides slower aging kinetics and better weldability than gamma-prime superalloys....
Inconel 718 is the most widely used nickel superalloy in aerospace — ~35% of modern turbofan engine weight. Gamma-double-prime (Ni3Nb) precipitation hardening provides slower aging kinetics and better weldability than gamma-prime superalloys. Solution anneal at 1,010°C (AMS 5662), age at 720°C/8h + 620°C/8h. Service: -253°C to 650°C.
Quick Facts
| Category | Nickel Alloy |
| Standard | AMS 5662 / ASTM B637 |
| Density | 8190 kg/m³ |
| Yield Strength | 1,034 MPa (aged) |
| Tensile Strength | 1,275 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
AMS 5662 vs 5663?
5662: lower solution temp (1,010°C) for higher tensile strength. 5663: higher (1,065°C) for better stress-rupture at 650°C.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu