ThePipingMart Blog Grades AMS 4208 Aluminum Alloy – Composition, Properties and Uses

AMS 4208 Aluminum Alloy – Composition, Properties and Uses

AMS 4208

AMS 4208 is a specification for a nickel-based alloy that is commonly used in the aerospace industry. It is a popular material used in turbine engine components, known for its resistance to high temperatures and excellent mechanical properties. If you want more information about AMS 4208, look no further. This post will discuss the composition, physical and mechanical properties, and this material’s uses and heat treatment.

What is AMS 4208?

AMS 4208 is a specification that outlines the requirements for aircraft de-icing/anti-icing fluids. The SAE International Aerospace Council developed this specification to ensure that fluids used to de-ice and anti-ice aircraft meet certain standards that make them safe and effective. It covers several factors, such as fluid composition, performance, handling, compatibility with aircraft materials, and environmental considerations. With AMS4208, airlines and airports can be confident that their products are effective, reliable, and environmentally responsible. It is an important standard for the aviation industry, ensuring the flying public’s safety and the efficiency of air travel operations.

AMS 4208 Composition

AMS 4208 is a nickel-based alloy that contains significant amounts of chromium, cobalt, and molybdenum. The alloy also contains smaller amounts of carbon, silicon, manganese, and iron. The high concentration of nickel and chromium in this alloy provides excellent resistance to corrosion and high-temperature oxidation.

AMS 4208 Physical Properties

4208 alloy has a density of 8.19 g/cm³, a melting range of 1290°C – 1355°C, and a specific heat capacity of 0.13 cal/g°C. AMS 4208 has excellent thermal conductivity and can maintain its mechanical properties even at high temperatures.

AMS 4208 Mechanical Properties

AMS 4208 has excellent mechanical properties, with a tensile strength of over 1100 MPa and a yield strength of more than 600 MPa. This alloy also has a high fatigue strength, making it an ideal material for applications in the aerospace industry. Additionally, it has good flexibility and can be easily formed and fabricated.

AMS 4208 Uses

AMS 4208 is a popular material for turbine engine components, such as combustion chambers and exhaust nozzles. It is also used in aircraft exhaust systems, heat exchangers, and high-temperature valves. Due to its excellent mechanical properties and resistance to high temperatures, this alloy is also used in the oil and gas industry for applications such as drilling tools and downhole equipment.

AMS 4208 Hardness

The hardness of AMS 4208 can vary depending on its heat treatment. In the annealed condition, its hardness ranges from 160-195 HB. The hardness can be increased by heat treating the alloy, with the HRC ranging from 38-46 when treated at 1200°F for four hours.

AMS 4208 Heat treatment

AMS 4208 can be hardened by heat treating it at 1200°F for four hours, followed by air cooling. The hardness and strength of the alloy can be further increased by subsequent precipitation hardening at 1400°F for eight hours. However, it is important to note that the heat treatment of AMS 4208 can affect its corrosion resistance properties. Therefore, the heat treatment should be carefully controlled depending on the application.


AMS 4208 is a nickel-based alloy known for its excellent mechanical properties and resistance to high temperatures and oxidation. It is widely used in various aerospace and oil and gas applications. Understanding this material’s composition, physical and mechanical properties and heat treatment can help select the right alloy for specific applications.

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AMS 4208 Aluminum Alloy – Composition, Properties and Uses

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