ThePipingMart Blog Metals Inconel 718 vs 825 Alloys: What’s the Difference

Inconel 718 vs 825 Alloys: What’s the Difference

Inconel 718 vs 825 Alloys

Have you ever wondered what the difference is between Inconel 718 and 825 alloys? If so, you’re not alone. Many people are confused about the similarities and differences between these two metals. To help clear up any confusion, let’s take a look at how these two alloys compare.

What is Inconel?

Inconel is a family of nickel-based superalloys that offer superior strength and oxidation resistance in extreme temperatures and environments. Depending on the specific grade, it can be used in a variety of applications, such as aerospace components, medical equipment, automotive parts, and power generation components.

Differences between Inconel 718 and 825

The main difference between Inconel 718 and 825 is their chemical compositions. While both are nickel-chromium alloys, they have different ratios of other elements like iron, niobium, molybdenum, titanium, aluminum, copper, and carbon. This difference in composition gives them different properties when exposed to heat or pressure. For example, Inconel 718 has higher levels of niobium than 825, making it more resistant to oxidation at high temperatures, while the higher chromium content of 825 makes it more resistant to corrosion under certain conditions. The two alloys also differ in their machinability ratings; 718 has better machinability than 825 due to its lower hardness rating. Finally, Inconel 718 has higher tensile strength than 825, which makes it better suited for applications that require greater strength at elevated temperatures or pressures.

There are several critical differences between Inconel 718 and 825. First, Inconel 718 has a higher chromium content than Inconel 825, which gives it better corrosion resistance. Additionally, Inconel 718 can withstand higher temperatures than Inconel 825. Finally, Inconel 825 has better weldability than Inconel 718.


Both Inconel 718 and 825 are often used in high-temperature applications such as aircraft engine parts and chemical processing equipment. They are also both used in cryogenic applications due to their excellent creep resistance.


In general, Inconel 718 is more expensive than Inconel 825 due to its higher chromium content. However, the price difference between the two alloys will vary depending on the specific composition and supplier.


With so many similarities yet subtle differences between these two alloys, it’s important to have a thorough understanding of their chemical composition when selecting one over the other for your application or project. Ultimately each alloy offers unique advantages depending on your specific needs, so make sure you do your research before deciding which one will work best for your project or product. Understanding the key differences between Inconel 718 and 825 will help you select an alloy that meets your requirements while still providing maximum performance under even the toughest conditions or environments.

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