All You Need to Know about Nickel 718 Alloy

A tube used as a means of transportation

Not all metals can retain their strength when exposed to high temperatures or extreme cold. Nickel alloy 718 tubing, however, is a material worth knowing when it comes to that. This is one of the very few superalloys with such features.

In this article, we shall take a close look at nickel alloy 718 tubing and its impressive characteristics. In the engineering world, it is one of the most preferred material when dealing with high temperatures. A number of tests have been carried out on 718 and even in its application, it proves to be able to remain unchanged in structure when exposed to different temperatures. It even remains unchanged in extreme cold.

Its properties are unparalleled thanks to its composition of nickel, cobalt, and chromium. The composition is effective in resisting corrosion and oxidation which are elements that make so many other materials unsuitable for the applications in which 718 may be used.

The above are not the only composition of the alloy, it also has titanium, molybdenum, tantalum, and niobium all in varying compositions. The mixtures of these create a superalloy that suits the needs of engineers in different fields.

Retention Capacity

This is a material that is highly durable over time with no signs of degradation when exposed to different elements. Unlike other materials that can easily get disfigured in the process of welding or cooling, this alloy will heat and cool slowly while maintaining its shape.

Precipitation heat treatment at room temperature is remarkably enhanced to the extent that it can survive in severe environments.

Heat is used in varied ways to treat the alloy depending on what it will be used for. The way it is treated for use in the extreme cold will defer from the way it is treated for intense heat.

Many engineers are impressed by its versatility and the ease with which it can be welded without having to worry about cracks forming after the welding. This tubing shows superior characteristics when compared with other titanium-based alloys.


One of the areas where the alloy 718 is used is in aeronautic engineering. The jet engines are being constantly improved to make them more efficient and this alloy proves to be a reliable material to improve performance. But it’s not just performance, the alloy also proves to be cost-effective.

Engines need to be built with materials that can withstand the heat and remain in their original structure and free of corrosion. Engines will put the materials through mechanical strain as well as temperature stress and they need to be able to withstand it.

This alloy is used in different parts of jet engines as well as for making bolts and other components of jet engines. They are also used for rockets and machines that are used in very cold temperatures. There is also an application on land not just in the air where it is used to make sheet covering for engines that may heat up to very high temperatures as they operate.

There may be a few alloys that can provide similar functionality but when they are put side by side, 718 alloy will prove to be of superior grade.