ThePipingMart Blog Grades AMS 5598 Inconel Alloy – Composition, Properties, and Uses

AMS 5598 Inconel Alloy – Composition, Properties, and Uses

AMS 5598

AMS 5598 is a high-temperature nickel alloy used in various industries, such as aerospace, chemical processing, power generation, and more. Known for its excellent mechanical and physical properties, AMS5598 is highly sought after for applications that require high strength, toughness, and resistance to corrosion and oxidation. This blog post will closely examine AMS 5598’s composition, properties, hardness, and heat treatment.

What is AMS 5598?

AMS 5598 (also known as Inconel X-750) is a term you may have heard floating around but have yet to learn the exact details. Let’s break it down. AMS stands for Aerospace Material Specification and means that the material in question meets certain specifications for use in the aerospace industry. So, what about the number 5598? Well, that’s just the specific type of nickel alloy that meets those aerospace material specifications. It’s a versatile alloy used in everything from turbine blades to exhaust systems. It may seem like a small detail, but every little specification counts for something as crucial as aerospace materials.

AMS 5598 Composition

AMS 5598 is a Nickle-Chromium-Cobalt-based alloy with small additions of aluminium, titanium, and molybdenum. The precise composition is as follows:

– Nickel: 47%

– Chromium: 22.5%

– Cobalt: 14.5%

– Molybdenum: 3.0%

– Titanium: 2.7%

– Aluminum: 0.5%

– Others: 10.8%

AMS 5598 Physical Properties

AMS 5598 has excellent physical properties. Here’s a quick summary:

– Density: 0.299 lb/inch³

– Melting Point: 2440°F

– Coefficient of Thermal Expansion: 8.8×10^-6 in/in/°F (at 70°F)

– Specific Heat Capacity: 0.106 Btu/lb/°F (at 70°F)

– Thermal Conductivity: 7.15 Btu/(hr/ft²/°F/inch)

– Electrical Conductivity: 419.4 %IACS

AMS 5598 Mechanical Properties

AMS 5598 is known for its excellent mechanical properties, making it ideal for high-temperature applications. Here are its critical mechanical properties:

– Tensile Strength: 160 ksi

– Yield Strength: 100 ksi

– Elongation: 25%

– Hardness: 38 HRC (maximum)

AMS 5598 Uses

AMS 5598 is popular in the aerospace industry for components such as turbine engines, afterburners, and combustion chambers. It is also used in chemical processing plants and power generation plants where high-temperature corrosion and oxidation resistance are critical. AMS 5598 finds other applications in precision equipment, machinery, heat exchangers, and nuclear reactors.

AMS 5598 Hardness

AMS 5598 has a maximum hardness of 38 HRC. The hardness of AMS 5598 can be improved by heat treatment.

AMS 5598 Heat Treatment

AMS 5598 can be heat-treated to enhance its mechanical and physical properties. The process involves heating the alloy to a specific temperature, holding it for a long time, and then cooling it down. Heat treatment can improve the strength, hardness, and toughness of AMS 5598.


AMS 5598 is a high-temperature nickel alloy with excellent mechanical and physical properties. It finds its use in various industries, such as aerospace, chemical processing, power generation, and more. Understanding the composition, properties, uses, hardness, and heat treatment of AMS 5598 can help you make informed decisions about its use in your application. Whether you need high strength, toughness, or resistance to corrosion and oxidation, AMS 5598 is a great choice.

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