Inconel Alloy 718 vs Inconel Alloy X-750

inconel alloy 718 vs inconel alloy x-750

Both Inconel alloy 718 and Inconel alloy X-750 are superalloys that gain their strength through precipitation hardening.

They exhibit excellent high-temperature strength and corrosion resistance, distinguishing them from solid solution alloys.

Many popular science articles online explain this difference.

However, there is limited information available comparing Inconel 718 and Inconel X-750. This article aims to provide a detailed comparison of these two alloys, focusing on their chemical compositions, applications, and performance.

inconel 718

Subsequent research on alloy composition and microstructure led to the development of Inconel alloy 718. This alloy features stricter control of trace elements compared to Inconel X-750.

Additionally, Inconel 718 contains higher amounts of niobium, tantalum, and molybdenum, enhancing both solid solution strengthening and precipitation strengthening effects.

In summary, Inconel X-750 can be considered the predecessor of Inconel 718, with Inconel 718 serving as an improved iteration of Inconel X-750.

What is Inconel Alloy X-750?

inconel x-750

Inconel X-750 is an early-developed superalloy that incorporates aluminum, titanium, niobium, and tantalum into a solid solution strengthened base. This composition forms what is known as a precipitation strengthened alloy. Through specialized heat treatments, such as aging, these alloys achieve significantly higher strength compared to ordinary alloys. Inconel X-750 is engineered to meet the stringent demands of aerospace engine materials, which must withstand high temperatures, high pressures, and severe corrosion.

Inconel Alloy 718 Vs. Inconel Alloy X-750 Chemical Composition

Here’s a comparison table for the chemical composition of Inconel alloy 718 and Inconel alloy X-750:

inconel alloy 718 vs inconel alloy x-750 chemical composition

Inconel Alloy 718 Vs. Inconel Alloy X-750 Corrosion Resistance

Compared to Inconel X-750, Inconel 718 contains a higher chromium content, which enhances its oxidation resistance.

Additionally, Inconel 718 includes molybdenum, absent in Inconel X-750, which boosts its resistance to reducing environments.

As a result, Inconel 718 surpasses Inconel X-750 in all aspects of corrosion resistance.

Inconel Alloy 718 Vs. Inconel Alloy X-750 Mechanical Behavior

First, molybdenum is added to Inconel 718, serving as an ideal element for solid solution strengthening and increasing the base strength of the alloy.

Additionally, Inconel 718 reduces the aluminum and titanium content compared to Inconel X-750, while significantly increasing the niobium and tantalum content. This composition enhances both precipitation strengthening phases.

Therefore, Inconel 718 exhibits significantly superior mechanical properties compared to Inconel X-750.

Inconel Alloy 718 Vs. Inconel Alloy X-750 Physical Properties

 
 Inconel Alloy 718Inconel Alloy X-750
Density, g/cm³8.198.28
Density, lb/in.³0.2960.299
Melting Range, °F2300-24372540-2600
Melting Range, °C1260-13361390-1430
Permeability at 200 oersted (15.9 kA/m)1.00061.0035
Curie Temperature, °F-170-193
Curie Temperature, °C-112-125

Inconel Alloy 718 Vs. Inconel Alloy X-750 Applications

INCONEL alloy 718 is utilized in the engineering of components for liquid-fueled rockets, rings, casings, and various formed sheet metal parts for both aircraft and land-based turbine engines. Additionally, INCONEL alloy 718 is employed in cryogenic tankage at the lower end of the temperature spectrum.

Due to its excellent relaxation resistance, alloy X-750 is ideal for high-temperature springs and bolts. It is also used in gas turbines, rocket engines, nuclear reactors, pressure vessels, tooling, and aircraft structures.

Inconel Alloy 718 Vs. Inconel Alloy X-750 Main Standards

Here is the comparison table listing the specifications for Inconel 718 and Inconel X-750 across various product forms:

inconel alloy 718 vs inconel alloy x-750 main standards

Inconel Alloy 718 Vs. Inconel Alloy X-750 Cost

Although Inconel 718 outperforms Inconel X-750 in most aspects, their price difference is not substantial.

This is partly because Inconel 718 has a lower nickel content and a higher iron content, reducing the alloy’s raw material cost. Additionally, the widespread application of Inconel 718 leads to a larger supply, which also lowers its marginal cost.

Therefore, if your project is undecided between these two materials, we recommend choosing Inconel 718. It offers better performance at a comparable price.

Conclusion

With the addition of more chromium, molybdenum, niobium, and tantalum, Inconel 718 surpasses Inconel X-750 in both corrosion resistance and high-temperature strength. Furthermore, its precise control of trace elements enhances its long-term performance.

In summary, Inconel 718 is an improved version of Inconel X-750, offering superior performance while maintaining a similar price point. It is the preferred choice for projects.

We offer high-performance Inconel 718 and Inconel X-750 materials. If you have purchasing needs, please contact our expert team.

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