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Knowledge Base

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What is 5160 spring steel?


5160 spring steel is a type of high-carbon, chromium alloy steel that is commonly used in the production of springs and other high-strength applications. It belongs to the AISI-SAE 51xx steel series, which includes various grades of chromium alloy steels.


The composition of 5160 spring steel typically consists of:

  • Carbon (C): 0.56% - 0.64%
  • Chromium (Cr): 0.7% - 0.9%
  • Manganese (Mn): 0.75% - 1.00%
  • Phosphorus (P): maximum 0.035%
  • Sulfur (S): maximum 0.040%

The addition of chromium in the alloy helps improve hardenability, wear resistance, and tensile strength. The manganese content contributes to the steel's toughness and hardenability.


5160 spring steel is valued for its excellent toughness, durability, and ability to withstand heavy loads and repeated stress. It is often used for applications that require reliable and resilient springs, such as leaf springs in automotive and truck suspensions, coil springs, and various types of flat springs. It can also be found in other high-strength components and tools.


The steel is typically hardened through heat treatment to optimize its properties. This may involve processes such as quenching and tempering to achieve the desired hardness, strength, and toughness.


Overall, 5160 spring steel is a popular choice for spring applications due to its strength, toughness, and ability to withstand demanding conditions.