What material is AMS 5666?
AMS 5666 material refers to Inconel 625 alloy, a high-performance nickel-chromium-molybdenum alloy (UNS N06625) that exhibits excellent corrosion/oxidation resistance and high-temperature strength (up to 2000°F). It is widely used in aerospace (piping, engines) and marine environments, and is available in forms such as annealed bars and forgings, possessing excellent weldability and non-magnetic properties.
What is Inconel 625 AMS 5666?
Inconel 625 AMS 5666 refers to a high-strength, corrosion-resistant nickel-based superalloy (UNS N06625) that conforms to the SAE Aerospace Material Specification (AMS) 5666 standard for forgings, bars, and rings. It exhibits excellent corrosion resistance at temperatures up to 2000°F/1093°C and in harsh corrosive environments. It is a non-magnetic alloy with extremely high fatigue strength and is widely used in aerospace, marine, and chemical industries.
What is the AMS standard for Inconel 625?
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy that conforms to various ASTM standards. Key specifications include ASTM B444/B444M for seamless tubing, ASTM B564 for forgings, and ASTM B446 for bars/wires/forging stock. Common grades include Grade 1 (annealed) and Grade 2 (solution annealed).
Chemical Composition:
| Symbol | Min % | Max % |
|---|---|---|
| C | - | 0.10% |
| Mn | - | 0.50% |
| Si | - | 0.50% |
| P | - | 0.015% |
| S | - | 0.015% |
| Cr | 20.00% | 23.00% |
| Mo | 8.00% | 10.00% |
| Cb (Nb) | 3.15% | 4.15% |
Annealed Longitudinal Tensile Properties per AMS 5666
| Property | Up to 4", incl. | Over 4" to 10", incl. |
|---|---|---|
| Tensile Strength | 120 ksi | 110 ksi |
| Yield Strength 0.2% offset | 60 ksi | 50 ksi |
| Elongation in 4D | 30% | 25% |
| Hardness | 287 Bhn max | 287 Bhn max |
inconel 625 heat treatment
The heat treatment of Inconel 625 includes solution annealing (approximately 1900-2200°F/1040-1200°C, followed by quenching) to improve ductility and corrosion resistance; stress relieving (1100-1500°F/590-815°C) is sometimes also performed to reduce internal stresses. Lower temperature aging treatments (1050-1350°F/566-732°C) can further strengthen the material through precipitation hardening.
Inconel®625 Nickel Applications:
Nickel Alloy 625 aerospace applications include jet engine exhaust systems, propeller blades, heat exchangers, and aircraft applications. It's also used for heat shields, furnace hardware, chemical plant equipment, and seawater applications.
AMS 5666 vs AMS 5599
AMS 5666 and AMS 5599 both refer to the same base alloy, Inconel 625 (UNS N06625), but specify different product forms: AMS 5666 covers bars, forgings, and rings, while AMS 5599 covers plate, sheet, and strip; they share the same excellent corrosion resistance and high strength due to their nickel-chromium-molybdenum-niobium composition but differ in shape and related processing standards like ASTM B446 for 5666 and B443 for 5599.
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