ThePipingMart Blog Grades Inconel X-750 (UNS N07750) – Composition, Properties, and Uses

Inconel X-750 (UNS N07750) – Composition, Properties, and Uses

Inconel X750

In this blog post, we will explore this unique alloy’s properties, uses, and applications.

What is Inconel X-750?

Inconel X750 is one of the most widely used superalloys in the aerospace, power generation, and petrochemical industries. It consists of a mixture of nickel, chromium, tantalum, and other elements. This alloy offers excellent mechanical and physical properties, making it an ideal material for high-temperature and high-stress applications.

Inconel X-750 Composition

Inconel X750 is a precipitation-hardened nickel-chromium alloy with a chemical composition of 73% nickel and 15-17% chromium. It also contains small amounts of iron, titanium, and aluminium, as well as other trace elements like molybdenum and cobalt. Adding various elements gives this alloy unique properties, such as its high strength and excellent oxidation and corrosion resistance.

Element Content (%)
Chromium, Cr 14-17
Iron, Fe 5-9
Titanium, Ti 2.25-2.75
Manganese, Mn 1 max
Niobium, Nb 0.7-1.2
Copper, Cu 0.5 max
Silicon, Si 0.5 max
Aluminum, Al 0.4-1
Carbon, C 0.08 max
Sulfur, S 0.01 min
Nickel, Ni Remainder

Inconel X-750 Mechanical Properties

Inconel X750 offers unique mechanical properties, including high tensile and yield strength and excellent fatigue and creep resistance. Its tensile strength can reach 180 ksi, while its yield strength can reach 125 ksi. This makes it an ideal material for applications that require high power and high performance, even at elevated temperatures.

Properties Metric Imperial
Tensile strength 1325 MPa 192.2 ksi
Elongation at break (in 51 mm) 23.60% 23.60%
Reduction of area 42% 42%

Inconel X-750 Physical Properties

Inconel X750 has a density of 8.28 g/cm3, a melting point of 1393°C, and a thermal conductivity of 12.5 W/m K. It is also known for its excellent resistance to oxidation, corrosion, and heat. These properties make it an ideal material for high-temperature applications, such as gas turbines, jet engines, and rocket engines.

Properties Metric Imperial
Density 8.26 g/cm³ 0.298 lb/in³
Melting point 1413°C 2575°F

Inconel X-750 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (at 20-500°C/70-800°F) 14.3 µm/m°C 7.8 µin/in°F
Thermal conductivity (at 200°C/400°F) 14.1 W/mK 98 BTU in/hr.ft².°F

Inconel X-750 Equivalent

Other designations that are equivalent to Inconel X750 alloy include:

AISI 688 AMS 5598 AMS 5670 AMS 5747 GE B50TF1232
AMS 5542 AMS 5667 AMS 5671 ASTM B637 GE B50YP44
AMS 5582 AMS 5668 AMS 5698 DIN 2.4669 MIL N-24114
AMS 5583 AMS 5669 AMS 5699 DIN 2.4699 MIL N-7786

Inconel X-750 Uses

Inconel X750 is used in many applications requiring high strength, high temperature, and corrosion resistance. It is frequently used in the aerospace and power generation industries for parts such as turbine blades, casings, disk forgings, and rocket engine components. Other typical applications include springs, fasteners, and wire mesh.

Inconel X-750 Corrosion Resistance

Inconel X750 offers excellent resistance to corrosion, making it an ideal material for harsh environments. It is highly resistant to corrosion and oxidation, even in extreme conditions, such as acidic or alkaline environments, as well as high-temperature and high-pressure environments. This makes it a popular choice in chemical processing and refining industries where corrosive environments are common.

Inconel X-750 Heat Treatment

Inconel X750 can be heat treated to increase its strength and hardness. It can be hardened by precipitation hardening or by cold working. Heat treatment processes like annealing and solution annealing can improve its ductility and toughness. The heat treatment process depends on the application and desired properties of the alloy.

Inconel X-750 Machining

Due to its unique properties, Inconel X750 can be difficult to machine. This alloy’s high strength and hardness make it challenging to work with using traditional methods. However, modern machining techniques, such as high-speed cutting and carbide tools, can significantly improve the machining of this alloy.

Inconel X-750 Welding

Inconel X750 welding requires special attention due to its high resistance to corrosion and oxidation. Care must be taken to use appropriate filler materials, preheat the base material, and use proper post-weld heat treatment treatments. Additionally, inert gas shielding can help reduce porosity while welding Inconel X750.


Inconel X750 is a highly desirable material for high-temperature and high-stress aerospace, power generation, and petrochemical applications. It offers excellent mechanical and physical properties, including high strength, corrosion resistance, and oxidation resistance. With its impressive properties, it is no wonder that this alloy is a popular choice for many critical applications. If you require a material that can withstand challenging environments, Inconel X750 should be at the top of your list.

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