1. Carbon Spring Steel
- Representative grades: 65Mn, 70#, T8A
Carbon spring steel generally has a carbon content of 0.61%-0.90%. Based on its manganese content, it is categorized into two types: those with a standard manganese content of 0.50%-0.80%, such as 65/70/85, and those with a higher manganese content of 0.90%-1.20%, such as 65Mn.

2. Alloy Spring Steel
55CrSi / 60Si2Mn
Features: Silicon addition enhances elasticity and fatigue resistance; provides excellent thermal stability and resistance to tempering softening.
50CrVA (Chrome Vanadium Steel)
Features: High strength, high toughness, excellent fatigue resistance, good resilience, and heat resistance.

Alloy spring steel is a steel that is made by adding one or more alloying elements to carbon spring steel to improve its mechanical properties, hardenability and other properties, so as to meet the performance requirements of various springs.

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