ThePipingMart Blog Grades AMS 5894 Cobalt Alloy – Composition, Properties, and Uses

AMS 5894 Cobalt Alloy – Composition, Properties, and Uses

AMS 5894

AMS 5894 refers to a specific type of alloy steel. It is a high-strength low-alloy steel designed for demanding aerospace and industrial applications. In this blog post, we will explore the details of AMS 5894, from its composition to its physical and mechanical properties, as well as its uses and heat treatment options.

What is AMS 5894?

AMS 5894 is a specification for high-strength, low-alloy steel commonly used to produce aircraft engine components. This specialized material meets strict criteria, including resistance to corrosion and fatigue and exceptional welding capabilities. With the rigorous demands of the aviation industry, using AMS5894 ensures reliability and safety in flight. Its unique properties make it an essential component in the engines that power commercial and military aircraft worldwide.

AMS 5894 Composition

AMS 5894 is a type of steel composed primarily of iron, manganese, and molybdenum. Its precise composition may vary depending on the manufacturer. Still, it will generally contain less than 0.15% carbon, up to 1.0% silicon, 0.6-1.1% manganese, 0.3-0.5% molybdenum, and trace amounts of other elements such as sulfur and phosphorus. This composition gives it a unique set of physical and mechanical properties.

AMS 5894 Physical Properties

AMS 5894 is a non-corrosive alloy steel with good resistance to atmospheric and chemical corrosion. It is also highly resistant to oxidation and scaling at high temperatures. Its specific gravity is 7.85-8.05, with a melting point of around 1410-1460°C. Furthermore, it is highly conductive, making it suitable for electrical applications.

AMS 5894 Mechanical Properties

AMS 5894 has excellent mechanical properties, making it ideal for use in demanding aerospace and industrial applications. It has a tensile strength of around 860-950 MPa, a yield strength of about 720-835 MPa, and a good impact resistance. Its fracture toughness is also high, which makes it resistant to brittle fracture. Additionally, it has a high fatigue strength, which means it can resist repeated loading without deforming or breaking.

AMS 5894 Uses

AMS 5894 is commonly used in various aerospace and industrial applications, including aircraft engine components, turbine discs, compressor blades, landing gear, and other high-stress parts. It is also used in the oil and gas industry, where its high strength, excellent corrosion resistance, and good toughness make it ideal for use in drilling equipment, drilling risers, and other high-stress components.

AMS 5894 Hardness

AMS 5894 has a hardness that ranges from 30-36 HRC (Rockwell C scale). Applying heat treatment processes such as quenching and tempering can further increase this hardness. This process involves heating the steel to a high temperature and then rapidly cooling it to increase its hardness. It is followed by reheating and slow cooling to reduce brittleness caused by the initial hardening.

AMS 5894 Heat Treatment

AMS 5894 can be heat treated to achieve the desired hardness and mechanical properties required for a specific application. For example, quenching and tempering can increase the hardness and improve its tensile and yield strength. Annealing, on the other hand, can be used to relieve internal stresses and improve its machinability. Other heat treatment processes include normalizing, austenitizing, and stress-reducing.


In conclusion, AMS 5894 is a high-strength low-alloy steel ideal for aerospace and industrial applications requiring exceptional strength, good corrosion resistance, and high toughness. Its unique composition and physical and mechanical properties make it a popular choice for aircraft engine components, turbine discs, compressor blades, and drilling equipment, among other applications. With the proper heat treatment, it can be further optimized to meet specific application requirements.

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