Spring Steel: Composition, Grades, and Properties

Spring steel is a family of high‑carbon and alloy steels designed to flex under load and return to their original shape, making them ideal for springs, clips, and high‑stress components. Its chemistry is tuned for high yield strength, excellent fatigue resistance, and good toughness, with popular grades like 55Si7, 60SiCr7, SUP9, and 5160 widely used in automotive and industrial applications. 

To see detailed composition tables, equivalent international grades, mechanical properties, and key industrial uses—from leaf springs and suspensions to tools and machinery—read the full guide here: Full article on Nifty Alloys: https://niftyalloys.com/blogs/spring-steel