ThePipingMart Blog Grades AMS 4155 Aluminum Alloy – Composition, Properties and Uses

AMS 4155 Aluminum Alloy – Composition, Properties and Uses

AMS 4155

Due to their unique physical and mechanical properties, metals are crucial in various fields, such as engineering, construction, and manufacturing. AMS 4155 is one such alloy with distinct features, making it an excellent material for different applications. This blog post will explore the composition, physical and mechanical properties, heat treatment, hardness, and uses of AMS 4155.

What is AMS 4155?

AMS 4155 is a specification developed by the SAE International Aerospace Information Report that provides guidelines for the reliability and performance of electronic assemblies used in space and high-reliability applications. This standard outlines the tests and requirements for electronic components used in the harsh space environment. It covers the numerous aspects ranging from design, production, screening, test, and qualification processes to ensure that the electronic assemblies you use will not fail in the demanding conditions it will face in space. This standard has become a critical component in the space industry, enabling reliable communication, navigation, and scientific research.

AMS 4155 Composition

AMS 4155 is a low alloy steel that contains elements like carbon, molybdenum, manganese, vanadium, and chromium. This alloy’s high percentage of molybdenum and chromium enhances its resistance to wear and corrosion. Its carbon content improves strength and hardness, while manganese enhances its toughness.

AMS 4155 Physical Properties

The physical properties of AMS 4155 include:

  • An average density of 7.85 g/cm³.
  • A melting point of 1426-1515°C.
  • A specific heat capacity of 0.5 J/g °C.

The alloy also has a thermal conductivity value of 42.7 W/mK and a coefficient of thermal expansion of 10.4 µm/mK.

AMS 4155 Mechanical Properties

AMS 4155 offers exceptional mechanical properties, including high tensile and yield strength, toughness, and flexibility. Its tensile strength is around 1195 MPa, while its yield strength is 1080 MPa. The alloy elongates at a break of 20% and a modulus of elasticity of 205 GPa.

AMS 4155 Uses

AMS 4155 has applications in various industries, such as aviation, aerospace, and defence, due to its excellent properties. It is primarily used to make parts that require high strength, wear, and corrosion resistance, such as gears, shafts, and bearings.

AMS 4155 Hardness

The hardness of AMS 4155 is generally high, but it can be varied through heat treatment processes. The standard hardness range for this alloy is 302-352 HB. However, through proper quenching and tempering, AMS 4155 can attain a maximum hardness of up to 444 HB.

AMS 4155 Heat Treatment

AMS 4155 can undergo different heat treatment processes to attain specific mechanical properties. For instance, normalizing can improve its toughness, while tempering can boost its ductility and reduce its brittleness. Quenching and tempering processes can enhance its hardness, strength, and wear resistance.


AMS 4155 is a low alloy steel with exceptional mechanical properties like high strength, toughness, and wear resistance. It’s unique composition and physical properties make it an ideal material for various industry applications. Understanding its properties and uses is crucial in ensuring it is appropriately utilized and optimized for its intended purpose.

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