In the world of metal materials, Inconel 750 and Inconel 718 both possess extraordinary resistance to high temperatures and corrosion, making them widely used in various engineering applications in extreme environments. However, despite belonging to the same category of alloys, significant differences still exist between them. So, Inconel 750 vs 718 – what are the differences? In this article, let’s delve into these two excellent high-temperature alloys.
Inconel 750 vs 718 – What’s the Difference？
Inconel 750 vs 718 – 1. Differences in Composition
Inconel 750 is a nickel-based high-temperature alloy containing approximately 70% nickel, 15% chromium, 5% iron, and the remaining elements such as cobalt, molybdenum, and titanium. This composition gives it excellent high-temperature strength and corrosion resistance.
In contrast, Inconel 718 contains a similar composition but with higher levels of chromium and smaller amounts of aluminum. This gives Inconel 718 better strength and creep resistance in high-temperature environments.
Inconel 750 vs 718 – 2. Differences in Mechanical Properties
Inconel 750 exhibits good strength and plasticity at room temperature. Its tensile strength and yield strength are both high, making it suitable for applications withstanding complex stresses. In high-temperature environments, Inconel 750 has a strong ability to maintain strength and can withstand high temperatures up to 1000°C.
Inconel 718 has similar mechanical properties to Inconel 750 but exhibits better performance in high-temperature environments. It is able to withstand high temperatures up to approximately 650°C and has excellent creep and fatigue resistance.
Inconel 750 vs 718 – 3. Temperature
Inconel 750 is suitable for medium-temperature applications and can maintain its mechanical properties in environments up to approximately 800°C. This makes it widely used in the aerospace, petroleum, and chemical industries.
On the other hand, Inconel 718 can maintain excellent performance at even higher temperatures, making it an ideal choice for high-temperature applications in the aerospace and energy sectors.
Inconel 750 vs 718 – 4. Processing Performance
The processing performance of Inconel 750 is good, and it is easy to weld and machine. It also has good adaptability to heat treatment and cold working, which makes it relatively easy to handle during the manufacturing process.
Inconel 718, however, has slightly inferior processing performance compared to Inconel 750. It has a higher sensitivity to heat treatment and requires more precise control to avoid embrittlement. Additionally, the welding process for Inconel 718 requires special attention to prevent the formation of cracks or brittle zones.
Inconel 750 vs 718 – 5. Application Fields
Inconel 750 is widely used in aerospace, petroleum, and energy industries due to its high strength and corrosion resistance. It is a preferred material for manufacturing complex components in these fields, such as aircraft engine components, oil and gas pipelines, and nuclear reactor components.
Inconel 718, on the other hand, is primarily used in high-temperature environments in aerospace and energy industries due to its excellent high-temperature performance. It is employed in manufacturing aircraft engine components, rocket engine nozzles, and turbine components that operate at high temperatures.
Why Choose Huaxiao Alloy?
There are significant differences between Inconel 750 and Inconel 718 in terms of composition, mechanical properties, service temperature, processing properties, and application fields. The choice of alloy depends primarily on the specific application needs and operating environmental conditions. Inconel 750 is a good choice for applications requiring complex stresses in moderate-temperature environments. In applications where excellent strength and creep resistance are required in high-temperature environments, Inconel 718 has more advantages.
Thank you for reading our article and we hope it can help you to have a better understanding of the differences between Inconel 750 vs 718. If you are looking for Inconel 750 and Inconel 718 suppliers across the world, please don’t hesitate to contact Huaxiao Alloy.
As a leading supplier of high-temperature alloys across the world, Huaxiao Alloys provides our customers with Inconel 750, Inconel 718, Monel K500 and Monel 400, Inconel 602 alloy, Hastelloy S Alloy, Inconel Alloy 600, Inconel Alloy 601, Inconel 625 UNS N06625, Hastelloy B3 (UNS N10675), Hastelloy D205, Hastelloy G30 (UNS N06030), Hastelloy C-2000, Hastelloy B2, Hastelloy X alloy, Hastelloy C4, Hastelloy C-276, and Hastelloy C22.
