ThePipingMart Blog Grades AMS 5669 – Composition, Properties, and Uses

AMS 5669 – Composition, Properties, and Uses

AMS 5669

The aerospace industry is constantly evolving, and the demand for high-performance materials is rising. One such material that has an important place in this industry is AMS 5669. AMS 5669 is a nickel-based alloy specification known for its excellent resistance to high-temperature corrosion, good strength, and toughness. This blog will discuss the composition, physical and mechanical properties, hardness, heat treatment, and the various uses of AMS 5669.

What is AMS 5669?

AMS 5669 (also known as Inconel X-750) is a premium-grade stainless steel alloy specification for high-temperature and corrosive environments. Its unique properties set it apart from other stainless steel alloys. For example, AMS 5669 is incredibly strong and durable, making it perfect for aerospace and other high-stress industries. It’s also highly resistant to corrosion, which means it can withstand exposure to harsh chemicals and extreme weather conditions without breaking down.

What Form is AMS 5669 Available at Piping Mart?

  • Bar
  • Nuts
  • Bolts
  • Washers
  • Screws
  • Fasteners
  • Stud Bolts
  • Sheet Plates

AMS 5669 Composition

AMS 5669 is an alloy consisting primarily of nickel, chromium, molybdenum, and iron. The alloy also contains small amounts of carbon, manganese, silicon, titanium, and aluminium. The exact composition of the alloy varies with the specific grade, but the overall composition ensures that the material remains stable at high temperatures and is resistant to corrosion.

Element Min % Max %
C 0.08
Mn 1.00
Si 0.50
S 0.01
Cr 14.00 17.00
Ni 70.00
Nb/Cb 0.70 1.20
Ti 2.25 2.75
Al 0.40 1.00
Fe 5.00 9.00
Co 1.00
Ta 0.05
Cu 0.50

AMS 5669 Physical Properties

The material has a density of 8.2 g/cm³ and a melting point of 1343°C. It has a relatively high coefficient of thermal expansion, which means the material expands and contracts quickly when subjected to temperature changes. The coefficient of thermal conductivity is also relatively high, which means the material transfers heat quickly.

Density (lb / cu. in.) 0.298
Specific Gravity 8.25
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.103
Electrical Resistivity (microhm-cm (at 68 Deg F)) 731
Melting Point (Deg F) 2575
Thermal Conductivity 83
Mean Coeff Thermal Expansion 7
Magnetic Permeability 1
Modulus of Elasticity Tension 31
Reduction of Area 42

AMS 5669 Mechanical Properties

AMS 5669 exhibits excellent tensile, yield, and elongation properties, making it ideal for applications requiring strength and ductility. The material can withstand high temperatures up to 982°C and has excellent resistance to thermal fatigue. Additionally, the material has good welding and brazing properties.

AMS 5669 Uses

AMS 5669 has various applications in various industries, including aerospace, power generation, and chemical processing. The material makes engine components such as turbine cases, combustors, and exhaust systems. It is also used in hot gas path components for gas turbines and power plants. Additionally, the material is used for chemical processing equipment such as reactors, heat exchangers, and distillation columns.

AMS 5669 Hardness

AMS 5669 is a relatively tough material, with a Rockwell hardness value of 35-45 HRc. The alloy’s hardness can be increased through various heat treatment processes, including cold working, annealing, and precipitation hardening.

AMS 5669 Heat Treatment

AMS 5669 sheet can be heat-treated through various processes to improve its mechanical properties, including cold working, annealing, and precipitation hardening. The heat treatment process depends on the material’s specific application and desired mechanical properties.


AMS 5669 material is a nickel-based alloy known for its excellent resistance to high-temperature corrosion, strength, and toughness. The material has various applications in various industries and is commonly used to make critical components for aircraft engines and gas turbines. Its excellent mechanical properties and resistance to high temperatures make it an ideal material for highly demanding applications in challenging environments. Understanding the physical and mechanical properties of AMS 5669 is crucial for choosing a suitable material for a specific application.

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