ThePipingMart Blog Grades AMS 6439 Steel – Composition, Properties, and uses

AMS 6439 Steel – Composition, Properties, and uses

AMS 6439

Metal alloys are extremely popular because they offer various properties unavailable from their component materials. AMS 6439 alloy has gained popularity in the manufacturing industry, particularly in aerospace and defence applications. This blog aims to give you a detailed understanding of AMS 6439’s composition, physical properties, and mechanical properties.

What is AMS 6439?

AMS 6439 is a specific type of steel alloy commonly used in aerospace applications. This high-strength material is known for its durability and resistance to corrosion, making it an ideal choice for aircraft parts that must withstand extreme conditions. AMS6439 is also well-regarded for its excellent machinability and weldability, allowing for greater manufacturing and customisation flexibility. As a result, this alloy has become a staple in the aerospace industry and plays a crucial role in the construction of many aircraft models today. Whether you’re a pilot, engineer, or simply someone interested in aviation, understanding the properties and benefits of AMS6439 is essential for gaining insight into the advanced technology behind modern aeroplanes.

AMS 6439 Composition

AMS 6439 is a type of steel alloy with high levels of nickel, chromium, and molybdenum, providing excellent corrosion resistance and improved strength. The alloy is carbon-free and can be processed to attain high levels of toughness, making it an ideal choice for parts and components that require high strength while still being lightweight.

AMS 6439 Physical Properties

AMS 6439 has a density of 7.75 g/cm³, which is relatively low compared to other similar alloys. It has a melting point of 1370°C, and its thermal conductivity is 18.4 W/mk at 100°C. This alloy is also known for its excellent electrical conductivity, making it an excellent choice for electrical contacts in harsh environments.

AMS 6439 Mechanical Properties

AMS 6439 is known for its high strength and excellent fatigue properties. It has a tensile strength of 1375 MPa and a yield strength of 1245 MPa, both impressive. It is also resistant to corrosion and has excellent fracture toughness. When heat treated, this alloy exhibits high toughness and excellent flexibility, making it easier to process and form into complex shapes with precision.

AMS 6439 Uses

AMS 6439 is used extensively in aerospace and defence applications due to its high strength and lightweight properties. It is commonly used to manufacture aircraft landing gear, hydraulic systems, and other critical components where strength, toughness, and corrosion resistance are vital. This alloy is also used to produce high-performance engine parts and fasteners.

AMS 6439 Hardness

AMS 6439’s hardness can be controlled by varying its heat treatment. After annealing, the alloy typically exhibits a hardness of 230HB, which can be increased to 300HB by quenching and tempering. This alloy’s hardness can be controlled to specific levels, depending on the intended application, making it extremely versatile.

AMS 6439 Heat treatment

Heat treatment is a critical process in the manufacturing of AMS 6439 alloys. After forging, the alloy is annealed, enhancing its flexibility and making it easier to process the alloy. This is followed by quenching, which improves its hardness and strength, and then tempering to reduce the brittleness that might occur during quenching.


AMS 6439 is a popular metal alloy with many applications thanks to its excellent corrosion resistance, high strength-to-weight ratio, and excellent mechanical properties. Its unique properties make it an excellent choice for parts and components that require high strength and toughness while still being lightweight. Its low density, high fatigue life, and exceptional fracture toughness make it a popular choice for demanding applications such as aerospace and defence. By varying its heat treatment, its hardness can be controlled to specific levels, making it versatile for various applications.

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