AMS 5662 and AMS 5663 are two of the most commonly used aerospace standards for Inconel 718 (UNS N07718) bars and forgings.
Although the chemical composition is essentially the same, differences in delivery condition and heat treatment can lead to significant variations in mechanical properties, machinability, lead time, and cost.
For procurement professionals, choosing the wrong AMS grade can result in: paying extra for unnecessary heat treatment, difficulties in machining, and failure to meet engineering drawing requirements.
What is Inconel 718 AMS 5662?
AMS 5662 standard specifically covers alloys in the solution-treated condition for bars, forgings, and rings, and requires the use of high-quality multiple melting processes. Inconel 718 AMS 5662 is the aerospace standard (AMS) for nickel alloy 718, a high-strength, corrosion-resistant superalloy widely used in jet engines, aerospace components, and oil/gas equipment.
What is Inconel 718 AMS 5663?
Inconel 718 AMS 5663 refers to the fully aged (precipitation-hardened) condition of nickel alloy 718, which conforms to the Society of Automotive Engineers (SAE) Aerospace Material Specification (AMS) 5663 for bars, forgings, and rings. This material offers exceptional strength, corrosion resistance, and high-temperature performance (up to approximately 1300°F), making it suitable for critical aerospace, gas turbine, and downhole oil and gas equipment components.
AMS 5662 vs.5663：Specification
| Standard | Product Form | Heat Treatment Condition |
|---|---|---|
| AMS 5662 | Bars & Forgings | Solution treated |
| AMS 5663 | Bars & Forgings | Solution treated + aged |
Chemical Composition AMS 5662 vs.5663
| Element | Typical Range (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.8 – 3.3 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.2 – 0.8 |
AMS 5662 vs AMS 5663 (Room Temperature)：Mechanical Properties
| Property | AMS 5662 | AMS 5663 |
|---|---|---|
| Yield Strength (0.2%) | ~550–750 MPa | ≥1,000 MPa |
| Tensile Strength | ~900–1,100 MPa | 1,250–1,450 MPa |
| Elongation | 20–30% | 12–20% |
| Hardness | ~25–30 HRC | 36–45 HRC |
| Machinability | Better | More difficult |
What is the main difference between AMS 5662 and AMS 5663?
The main difference is the heat treatment: AMS 5662 is Inconel 718 in the soft, solution-annealed (raw) condition, while AMS 5663 is the same alloy after solution treatment and subsequent aging (precipitation hardening), resulting in significantly higher strength and hardness. AMS 5662 offers easier machining, but AMS 5663 provides superior mechanical properties for final use in demanding applications like aerospace.
Is AMS 5663 stronger than AMS 5662?
Yes, AMS 5663 is significantly stronger than AMS 5662 because AMS 5662 is Inconel 718 in the solution-annealed (softer, lower strength) state, while AMS 5663 is the same material after being aged (precipitation-hardened) for much higher tensile strength and hardness, making it ideal for demanding aerospace applications.
who choose us?
GNEE is a reliable supplier of Inconel 718 round bars, offering UNS N07718 / W.Nr. 2.4668 round bars with diameters typically ranging from Ø6 mm to Ø450 mm, available in solution-treated or solution-treated and aged conditions.
All Inconel 718 round bars are manufactured according to ASTM B637, AMS 5662 / AMS 5663 standards and come with EN 10204 3.1 certificates.
GNEE offers various product forms, such as hot-rolled bars, forged bars, peeled bars, polished bars, and cut-to-length bars, to meet different processing and performance requirements.
For transportation and packaging, the round bars are protected with anti-rust oil, plastic wrapping, and packaged in seaworthy wooden crates or steel strapping.
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