Introduction to Inconel 718
Understanding the difference between Inconel 718 AMS 5663 and AMS 5662 is critical for ensuring the structural integrity and machinability of your aerospace or oil and gas components. While both refer to the same nickel-alloy base (UNS N07718), they represent two entirely different heat treatment stages that dictate the material's final strength.
As a leading Inconel 718 pipe supplier, we provide both solution-annealed and precipitation-hardened materials to meet your specific project requirements. Contact us to get free quote and sample!
Technical Comparison: Solution Annealed vs. Aged Condition
The primary differentiator lies in the precipitation hardening (aging) process.
- AMS 5662 (Solution Annealed): This is the "soft" state. The material is heated to approximately 1750°F (954°C) and cooled rapidly. It offers maximum ductility and is the preferred state for complex machining.
- AMS 5663 (Precipitation Hardened/Aged): This is the "high-strength" state. It starts as AMS 5662 and then undergoes a long aging process (usually 1325°F for 8 hours). This precipitates the gamma-double-prime ($\gamma''$) phase, providing its legendary tensile and yield strength.
Performance Matrix: AMS 5663 vs. AMS 5662
| Property | AMS 5662 (Annealed) | AMS 5663 (Aged) | Verdict |
| Condition | Solution Treated | Solution Treated + Aged | AMS 5663 is the finished state. |
| Hardness (Typical) | 20-25 HRC | 36-44 HRC | AMS 5663 is significantly harder. |
| Yield Strength (0.2%) | ~80 ksi (550 MPa) | 150 ksi (1035 MPa) min | AMS 5663 doubles the strength. |
| Machinability | Excellent | Difficult (Tool wear is high) | Machine in 5662, then age to 5663. |
| Standard | AMS 5662 | AMS 5663 | Both meet UNS N07718. |
AMS 5662 VS AMS 5663
AMS 5663P:
AMS5663P (2022-08-19): Nickel Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, Rings, and Stock for Forgings and Rings, 52.5Ni - 19Cr - 3.0Mo - 5.1Cb (Nb) - 0.90Ti - 0.50Al - 18Fe, Consumable Electrode or Vacuum Induction Melted, 1775 °F (968 °C) Solution and Precipitation Heat Treated.
AMS 5663 is a standard specifically for Inconel 718 castings. Inconel 718 AMS 5663 specifies the chemical composition, heat treatment requirements, mechanical properties, and testing requirements for Inconel 718 castings. This standard applies to cast forms of Inconel alloy 718, such as turbine engine parts, gas turbines, etc. AMS 5663 material properties ensure the required performance and quality of Inconel 718 UNS N07718 castings in high-temperature and high-stress environments.
AMS 5662P:
AMS5662P (2022-08-17): Nickel Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, Rings, and Stock for Forgings and Rings 52.5Ni - 19Cr - 3.0Mo - 5.1Cb (Nb) - 0.90Ti - 0.50Al - 18Fe Consumable Electrode or Vacuum Induction Melted 1775 °F (968 °C) Solution Heat Treated, Precipitation-Hardenable.
AMS 5662 is suitable for various forms of Inconel 718, AMS 5662 Inconel 718 including plates, bars, tubes, and forgings. Inconel AMS 5662 contains the chemical composition, heat treatment, mechanical property requirements, and testing standards of Inconel 718 alloy. AMS 5662 material properties ensure that nickel alloy 718 can meet the needs of high-temperature and high-stress environments in various forms.
When to Choose AMS 5663 for Your Project?
Choosing the right Nickel Alloy 718 pipe depends on your manufacturing flow:
1. High-Stress Applications
If your component requires maximum creep-rupture strength (e.g., turbine blades, high-pressure fasteners), AMS 5663 is mandatory. It ensures the material won't deform under extreme thermal loads.
2. Machining Efficiency
If your part requires extensive milling or drilling, we recommend purchasing Inconel 718 AMS 5662. Machining Inconel in its hardened state (5663) leads to rapid tool failure and increased price of Inconel 718 pipe production. You can heat-treat the finished part to meet AMS 5663 specs later.
FAQ: Inconel 718 AMS 5663 and 5662
Q1: Can AMS 5662 be converted to AMS 5663?
Yes. AMS 5663 is simply AMS 5662 that has undergone an additional precipitation hardening cycle. We can provide the material in either state or offer heat-treatment services.
Q2: Is there a price difference?
Yes. Because AMS 5663 requires an additional 15-20 hours of precise furnace aging, the price per kg is typically higher than AMS 5662.
Q3: Does Inconel 718 AMS 5663 require an MTC?
Absolutely. As a professional Alloy 718 material supplier, all our shipments include a Mill Test Certificate (MTC) verifying the hardness, grain size, and mechanical compliance with AMS 5663 or AMS 5662.
Get a Professional Quote on Inconel 718 pipe
Whether you need AMS 5662 for machining or AMS 5663 for immediate structural use, we have the stock and technical expertise to support your project.
Contact our sales team today for the latest Inconel 718 pipe price list and stock availability in various diameters.
