ThePipingMart Blog Grades AMS 7239 Alloy – Composition, Properties, and Uses

AMS 7239 Alloy – Composition, Properties, and Uses

AMS 7239

In the world of engineering and manufacturing, material selection plays a crucial role in the success of any project or product. One of the most popular and widely used materials in the aerospace, automotive, and oil and gas industries is AMS 7239. But what exactly is AMS 7239? This blog post dives deep into the composition, physical and mechanical properties, hardness, heat treatment, and uses of AMS 7239.

AMS 7239 Composition

AMS 7239 is a nickel-based alloy classified under the AMS (Aerospace Material Specification) standard. It comprises nickel, chromium, molybdenum, and titanium, with trace amounts of other elements. Its chemical composition is as follows: Ni 58%, Cr 21.5%, Mo 13%, Ti 4%, Al 2.9%, and Co 0.09%. The alloy’s high nickel content makes it resistant to corrosion and oxidation under high temperatures, while the presence of molybdenum and titanium enhances its strength and durability.

AMS 7239 Physical Properties

Regarding physical properties, AMS 7239 has a density of 8.19 g/cm3 and a melting point of 1315-1350°C. It is non-magnetic, has excellent fatigue resistance, and can withstand temperatures up to 760°C. The alloy also has excellent weldability and can be easily formed into various shapes and sizes.

AMS 7239 Mechanical Properties

AMS 7239’s mechanical properties are equally impressive. It has a high tensile strength of 140 ksi and a yield strength of 70 ksi. Its elongation at break is 25%, making it a ductile material that can endure high stress and strain. The alloy’s impact strength is also noteworthy, with an Izod impact value of 50 J/cm.

AMS 7239 Uses

AMS 7239 has a wide range of applications across various industries. It is commonly used in the aerospace industry for manufacturing jet engine components, gas turbine parts, and hot sections. The alloy finds use in the automotive industry for producing high-performance engine valves, exhaust systems, and turbochargers. In the oil and gas industry, AMS 7239 manufactures downhole tools, drill collars, and other components used in harsh and corrosive environments.

AMS 7239 Heat-Treated

AMS 7239 can be heat-treated to enhance its performance. Its recommended heat treatment involves a solution anneal at 1095°C followed by quenching in water or oil. This process helps to improve the alloy’s mechanical properties, including its strength, hardness, and corrosion resistance.

AMS 7239 Hardness

The hardness of AMS 7239 is typically measured using the Rockwell C scale, and its average hardness value is 25-30 HRC. The alloy’s hardness can be increased through heat treatment, making it suitable for applications requiring high wear resistance and strength.


AMS 7239 is a versatile material that offers a combination of excellent physical and mechanical properties, making it suitable for use in a wide range of applications. Its impressive strength, durability, and corrosion resistance make it a preferred material in the aerospace, automotive, and oil and gas industries. We hope this article has provided valuable insights into the world of AMS 7239 and how it can benefit your engineering and manufacturing projects.

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