ThePipingMart Blog Grades AMS 5875 Cobalt Alloy – Composition, Properties, and Uses

AMS 5875 Cobalt Alloy – Composition, Properties, and Uses

AMS 5875

The aerospace industry requires materials that are reliable, durable, and high-performing. That’s why nickel alloys are widely used in the field, and one that stands out is AMS 5875. It’s a unique material with excellent physical and mechanical properties; learning more about it is essential. In this blog post, we’ll discuss AMS 5875’s composition, physical and mechanical properties, uses, hardness, and the heat treatment it undergoes.

What is AMS 5875?

AMS 5875 is a nickel alloy also known as Inconel 5875. It’s a precipitation-hardening material, so it gets stronger as it ages. AMS 5875 is a specification from the American Society for Testing and Materials (ASTM) that covers high-performance titanium alloy 3Al-2.5V in sheet, strip, plate, bar and forging forms that can have superior strength at elevated temperatures. It offers properties like good weldability and excellent corrosion resistance.

AMS 5875 Composition

The main components of this alloy are nickel, chromium, cobalt, molybdenum, titanium, and aluminium, which contribute to its unique properties. The composition of AMS 5875 provides excellent corrosion resistance, high-temperature strength, and toughness, making it ideal for demanding environments.

AMS 5875 Physical Properties

The physical properties of AMS 5875 are impressive. It has a density of 8.19 g/cm³, a melting point of 1396°C, and a thermal conductivity of 11.9 W/m K at 21°C. It also has a coefficient of thermal expansion of 13.1 µm/m°C at 21°C, which makes it suitable for applications where expansion and contraction occur at high temperatures.

AMS 5875 Mechanical Properties

The mechanical properties of AMS 5875 are also noteworthy. Its tensile strength ranges from 980 MPa to 1230 MPa, with a yield strength of 705 MPa to 1105 MPa, depending on the heat treatment condition. It can withstand temperatures up to 870°C without losing its properties, making it an excellent choice for high-temperature environments.

AMS 5875 Uses

AMS 5875 is used in various applications due to its unique properties. It’s widely used in aerospace for engine components, such as turbine blades, compressor discs, and combustion liners. It is also used in the chemical processing industry for heat exchangers, furnace components, and piping systems, as well as in the marine industry for valves, pumps, and propeller blades.

AMS 5875 Hardness

AMS 5875 has a hardness that varies depending on the heat treatment condition. It can reach a maximum hardness of 43 HRC if it undergoes a solution heat treatment, followed by ageing. Choosing the proper heat treatment condition and post-treatment is essential to achieve the desired properties.

AMS 5875 Heat Treatment

Heat treatment is critical to achieving the desired properties of AMS 5875. It undergoes a solution heat treatment at 1080°C to 1120°C for 1 hour, followed by ageing at 790°C to 815°C for 24 hours. The ageing process causes precipitation hardening, which increases the strength and hardness of the alloy. It’s also essential to conduct post-treatment to ensure the stability and quality of the material.


AMS 5875 material is a versatile nickel alloy that withstands harsh environments and high temperatures. Its unique properties make it an excellent choice for the aerospace, chemical processing, and marine industries. By learning about its composition, physical and mechanical properties, uses, and hardness, as well as the heat treatment it undergoes, you can make an informed decision when selecting materials for your applications. Always consult with experts to ensure you get the best results.

Related Post