ThePipingMart Blog Grades AMS 5798 Inconel Alloy – Composition, Properties and Uses

AMS 5798 Inconel Alloy – Composition, Properties and Uses

AMS 5798

AMS 5798 is a high-performance metal alloy developed to withstand high-temperature environments and extreme conditions. This alloy is widely used in various industries – aerospace, power generation, petrochemical, and more – due to its exceptional mechanical and physical properties. This article will dive deeper into AMS5798’s composition, properties, and uses to comprehensively understand this versatile metal alloy.

What is AMS 5798?

AMS 5798 (also known as Inconel HX) is a specific type of nickel-based alloy with impressive properties. This superalloy is commonly used in the aerospace industry for its ability to withstand high temperatures and corrosive environments. It’s so durable that it’s often used in aircraft turbine engines and exhaust systems. Plus, it’s also resistant to oxidation and has good thermal stability, making it a reliable choice for critical applications.

AMS 5798 Composition

AMS 5798 is a nickel-based superalloy that contains a significant amount of cobalt, chromium, and molybdenum. The primary reason behind adding these metals is to increase the strength and high-temperature resistance of the alloy. To improve its corrosion resistance and ductility, the alloy also contains traces of other metals, including titanium, aluminium, tungsten, and niobium.

Element Content (%)
Nickel. Ni 47.5
Chromium, Cr 21.8
Iron, Fe 18.5
Molybdenum, Mo 9
Cobalt, Co 1.5
Tungsten, W 0.6
Silicon, Si 0.5
Manganese, Mn 0.5
Carbon, C 0.1

AMS 5798 Physical Properties

AMS 5798 is a dense, hard alloy with a specific gravity of 8.19 g/cm³. It has a high-temperature resistance of up to 1090°C (2000°F). The alloy has a thermal expansion coefficient of 14.2×10^-6 and a melting point of 1340°C (2444°F). Its good thermal conductivity makes it an ideal choice for high-temperature applications.

Properties Metric Imperial
Density 8.22 g/cm3 0.297 lb/in3
Melting point 1260 – 1355 °C 2300-2471°F

AMS 5798 Mechanical Properties

AMS 5798 has excellent mechanical properties that make it suitable for high-stress applications. It has a tensile strength of 918 MPa (133,000 psi) and a yield strength of 655 MPa (95,000 psi). The alloy has good ductility, with an elongation rate of 32%. It also has a good fatigue strength, making it resistant to stress fractures, especially in dynamic applications.

Properties Metric Imperial
Tensile strength 793 MPa 115000 psi
Yield strength 345 MPa 50000 psi
Elastic modulus 205 GPa 29700 ksi
Shear modulus 80 GPa 11600 ksi
Elongation at break 45.50% 45.50%
Hardness, Rockwell B 90 90

AMS 5798 Uses

As mentioned earlier, AMS 5798 has many applications in different industries. The aerospace industry uses this alloy in turbine engines, gas turbine blades, and exhaust systems. In the power generation industry, it is used to make steam turbines, boilers, and pollution control equipment. The oil and gas industry uses AMS 5798 to make drilling machinery and valves. The alloy is also used in medical implant devices and chemical processing equipment, including a few applications.

AMS 5798 Hardness

AMS 5798 is a hard-wearing alloy that has excellent wear resistance. It has a high degree of hardness, as measured by the Rockwell hardness scale. The alloy’s hardness can range from 20 HRC to 40 HRC, depending on the heat treatment process. Manufacturers use heat treatment to improve the strength and hardness of AMS 5798.

AMS 5798 Heat Treatment

Heat treatment is a critical process used to transform the properties of AMS 5798. The alloy undergoes various heat treatment processes to achieve the desired properties, including annealing, quenching, and tempering. Annealing softens the alloy, improves its ductility, and relieves stress. Quenching the alloy improves its strength, hardness, and wear resistance, while tempering improves its toughness and resistance to stress fractures.


AMS 5798 material  is an essential metal alloy used in many critical applications. Understanding its composition, physical and mechanical properties and heat treatment processes is vital in ensuring the alloy’s optimal performance. This alloy’s versatility and outstanding performance make it an ideal choice for various industries that require high-strength, high-temperature-resistant, and wear-resistant alloys. The future of AMS 5798 looks bright, and with continued research and development, we can expect even better performance from this unique metal alloy.

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