ThePipingMart Blog Grades Aermet® 340 Alloy – Composition, Properties and Uses

Aermet® 340 Alloy – Composition, Properties and Uses

Aermet 340

Engineering materials play a crucial role in completing numerous industrial processes. Among the many materials employed in engineering applications, cermet 340 is one of the most sought-after because of its exceptional mechanical and physical properties. It is a high-strength alloy used in many military and aerospace applications. In this blog post, we will explore some of the properties and uses of Aermet 340 and why it is a valuable material in various fields.

Aermet 340 Composition

Aermet 340 is a low-carbon steel that is composed of iron, nickel, chromium, and molybdenum in varying proportions. The addition of these elements has made the alloy highly resistant to wear and tear, making it one of the best materials for applications that require durability.

Element Amount
Iron (Fe) 68%
Cobalt (Co) 15.6%
Nickel (Ni) 12%
Chromium (Cr) 2.25%
Molybdenum (Mo) 1.85%
Carbon (C) 0.33%

Aermet 340 Mechanical Properties

Aermet 340 is known for its exceptional strength and toughness, even at high temperatures. It has a tensile strength of up to 2280 MPa and a yield strength of up to 1930 MPa, making it one of the strongest. The alloy has relatively good fatigue rest properties, making it a preferred material in manufacturing aircraft landing gear.

ensile Strength, Ultimate 2430 MPa 352000 psi
Tensile Strength, Yield 2160 MPa 314000 psi
Elongation at Break 11.3 % 11.3 %
Reduction of Area 55.2 % 55.2 %
Tensile Modulus 192 GPa 27900 ksi
Fatigue Strength 986 MPa
@# of Cycles 1.00e+7
143000 psi
@# of Cycles 1.00e+7
R=-1, Kt=1
Fracture Toughness 34.61 MPa-m½ 31.50 ksi-in½
Charpy Impact 14.6 J 10.8 ft-lb

Aermet 340 Physical Properties

One of the unique properties of Aermet 340 is its excellent machinability. This is partly due to its low carbon content, which makes it easier to machine than most high-strength alloys. The material is also corrosion-resistant, making it ideal in marine and corrosive environments.

Aermet 340 Uses

Aermet 340 has many uses in the military, aerospace, and industrial sectors. Some of the applications of Aermet 340 include the manufacture of aircraft landing gear, helicopter rotor materials, and missile thrust reversers. It is also used in the automotive and industrial sectors to manufacture bearings, gears, and other wear-resistant components.

Aermet 340 Corrosion Resistance

Aermet 340 is a low-carbon alloy that is highly resistant to corrosion, especially in marine and other corrosive environments. This characteristic makes it an excellent material for the manufacture of marine components.

Aermet 340 Heat Treatment

Aermet 340 can be heat treated to improve its mechanical properties. Heat treatment involves subjecting the material to high temperatures to enhance its tensile strength and toughness. The process can be done in various ways, depending on the desired characteristics of the material.

Aermet 340 Machining

Machining Aermet 340 is a relatively straightforward process compared to other high-strength alloys. The material’s low carbon content makes it easier to machine, making it an ideal material for manufacturing gears, bearings, and other components that require machining.

Aermet 340 Welding

The alloy can be welded using conventional welding techniques such as Gas Tungsten arc welding (GTAW). However, great care must be taken not to introduce contamination to the weld zone as it may reduce the material’s toughness.


In conclusion, Aermet 340 is a unique material with beneficial properties that make it ideal for numerous industrial and engineering applications. Its strength, toughness, and resistance to corrosion have made it a popular choice in the aerospace and marine industries. Additionally, its machinability and weldability have made it a preferred option for many automotive and industrial components. As we continue to explore new technology and undergo rapid industrialization, the demand for Aermet 340 is expected to continue to grow.

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