ThePipingMart Blog Grades AMS 5769 Alloy – Composition, Properties, and Uses

AMS 5769 Alloy – Composition, Properties, and Uses

AMS 5769

Many factors must be considered when selecting the right material for your manufacturing process. One of the most important considerations is the properties of the metal itself. AMS5769 is a material designed specifically to withstand the most extreme environments. In this blog, we will explore what AMS5769 is, its composition, physical and mechanical properties, uses hardness, and heat treatment.

What is AMS 5769?

AMS 5769 (also known as Alloy N-155) is a high-strength alloy often used in demanding aircraft and aerospace components applications. It offers remarkable corrosion resistance and wear and can withstand extremely high temperatures. Thanks to its impressive physical properties, it has become famous for manufacturers looking for a reliable, durable, high-performance material. As an expert in the field, I can attest to the numerous advantages that AMS 5769 offers, making it indispensable in various industries and applications.

AMS 5769 Composition

AMS 5769 is a type of steel used in aerospace, defence, and chemical processing industries. AMS 5769 comprises high nickel, chromium, and molybdenum levels and smaller amounts of carbon and other elements. This composition gives it excellent corrosion resistance and makes it resistant to high temperatures and pressure. It is also resistant to stress corrosion cracking, making it an ideal material for harsh operating conditions.

Element Content (%)
Chromium, Cr 20-22.5
Nickel, Ni 19-21
Cobalt, Co 18.5-21
Molybdenum, Mo 2.5-3.5
Tungsten, W 2-3
Manganese, Mn 1-2
Silicon, Si 1 max
Niobium,Nb + Tantalum, Ta 0.75-1.25
Carbon, C 0.08-0.16
Phosphorus, P 0.04 max
Sulfur, S 0.03 max
Nitrogen, N 0.1-0.2
Iron, Fe Remainder

AMS 5769 Physical Properties

The physical properties of AMS 5769 are impressive, with a density of 8.0 grams per cubic centimetre and a melting point of 1390 degrees Celsius. It also has a high thermal conductivity and is magnetic.

Properties Metric Imperial
Density 8.19 g/cm³ 0.296 lb/in³
Melting point 1343°C 2450 °F

AMS 5769 Mechanical Properties

The mechanical properties of AMS 5769 are equally impressive. It has a high tensile strength of up to 205 ksi and a yield strength of up to 170 ksi. It also has high toughness, making it a reliable material for demanding applications.

Properties Metric Imperial
Poisson’s ratio 0.298 0.298

AMS 5769 Equivalent

  • AISI 661
  • AMS 5532
  • AMS 5585
  • AMS 5768
  • AMS 5769
  • AMS 5794
  • ASTM B639
  • DIN 2.4964
  • GE B50A484

AMS 5769 Uses

AMS 5769 is used in a variety of industries and applications. Its excellent corrosion resistance makes it ideal for chemical processing and oil and gas industries. In contrast, its high-temperature resistance makes it ideal for aerospace and defence applications. It is also commonly used in rocket motors, combustion chambers, and heat exchangers. Its ability to withstand extreme environments and maintain its properties makes it an ideal material for demanding applications.

AMS 5769 Hardness

The hardness of AMS 5769 can vary depending on its heat treatment. It can achieve a maximum hardness of around 47 HRC when heat is treated correctly. It is also important to note that the hardness of AMS 5769 can affect its machinability. Depending on its hardness, AMS 5769 can either be easy or difficult to machine.

AMS 5769 Heat Treatment

Heat treatment is a critical step in the manufacturing process of AMS 5769. It involves heating and cooling the material in a specific way to achieve the desired properties. The most common heat treatment for AMS 5769 is annealing, which involves heating the material to a specific temperature and cooling it slowly. This process helps to relieve stress and improve the material’s mechanical properties.


AMS 5769 material is a versatile material that can withstand extreme operating conditions and maintain its properties. Its unique composition, and impressive physical and mechanical properties make it an ideal material for demanding applications. Understanding the properties of AMS 5769 is crucial in selecting a suitable material for your manufacturing process. Considering factors such as hardness and heat treatment, you can ensure that your finished product meets the required specifications.

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