Inconel is a group of nickel-chromium-based superalloys that are excellent for manufacturing springs used in extreme environments. They are known for their ability to maintain mechanical properties, such as strength and elasticity, at very high temperatures. Inconel alloys also offer superior resistance to corrosion, oxidation, and fatigue, making them a preferred choice over materials like stainless steel in demanding applications.

 

While many Inconel grades exist, a few are particularly well-suited for springs. The choice of grade depends on the specific requirements of the application, such as the maximum operating temperature and the type of corrosive environment.

This is one of the most widely used Inconel grades for springs. It is a precipitation-hardenable alloy that offers exceptional high-temperature resistance and high tensile and creep-rupture strength. It's often chosen for springs in jet engines and other high-stress applications.

 

Known as a versatile "workhorse" alloy, Inconel 718 is an age-hardenable material with a balance of high strength, corrosion resistance, and good fabricability. It performs well in both high and cryogenic temperatures, making it a popular choice for a wide range of spring applications, from jet engines to cryogenic processing equipment.

These grades are used for springs where corrosion resistance is a primary concern. Inconel 600 offers good general corrosion resistance at moderately elevated temperatures, while Inconel 625 provides superior resistance, particularly in marine and chemical processing applications. While they may not have the same high-temperature strength as X-750 or 718, their excellent corrosion resistance makes them invaluable in specific environments.