Alloy 625 - AMS 5666

SSS Super Alloys specialise in the supply of Alloy 625 in round bar form for aerospace application.

Consisting of nickel-chromium-molybdenum-niobium, Alloy 625 provides outstanding corrosion resistance and weldability.

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  • AMS 5666 J
  • ASTM B446 UNS N06625
  • Material may also be supplied to specific customer/OEM specifications, subject to enquiry

About Alloy 625 - AMS 5666

This grade is used in many demanding applications based on its high temperature resistance, high tensile strength, high creep strength, high rupture strength and excellent weldability.

Alloy 625 has been developed and used in aircraft components that require a high degree of reliability under high pressures. It is capable of retaining an impressive amount of tensile strength even under intense levels of heat, making it the material of choice for heat treating applications as it is capable of withstanding high temperatures better than stainless steel, titanium and other metals.

Application examples include ducting and exhaust systems, gas turbine rings and other high strength applications.

SSS Super Alloys are experienced in handling specific OEM requirements, with many major specifications adhered to and certificates released in accordance with individual specifications. Please contact for more details.

  • Engine Components -
  • Exhaust Systems -
  • Ducting Systems -
Technical data
Chemical analysis
0.10 Max
0.50 Max
0.50 Max
0.40 Max
0.40 Max
20.0 Min - 23.0 Max
8.0 Min - 10.0 Max
58.0 Min
0.015 Max
0.015 Max
1.0 Max
Niobium (Columbium) + Tantalum
3.15 Min - 4.15 Max
5.0 Max
Physical properties
Heat Treatment
Anneal at 875 – 1038°C for 30 minutes to 4 hours maximum at the set point temperature followed by quenching in water.
Size Range
Bar stock: 12.7mm to 300mm Dia
Mechanical properties
Yield 0.2% Offset
60 000 psi Min. (414 MPa)
120 000 psi Min. (828 MPa)
Reduction of Area
35% Min
30% Min
35HRC Max
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