Spring steel is a kind of alloy steel specially used for making springs, which has good elasticity and wear resistance. Spring steel can be divided into various classifications based on its alloy composition and properties.

1. Carbon spring steel: Carbon spring steel is the most common type of spring steel. It is mainly composed of iron and carbon elements, with a carbon content between 0.45% and 0.85%. Carbon spring steel has good elasticity and strength and is suitable for manufacturing general springs, coil springs and torsion springs, etc.

2. Chrome-molybdenum spring steel: Chrome-molybdenum spring steel is an alloy steel with alloy elements such as chromium and molybdenum added to carbon spring steel. Chromium-molybdenum spring steel has higher hardness and wear resistance, excellent fatigue resistance, and is suitable for manufacturing springs used under high strength, high temperature and high load conditions.

3. Silicon-manganese spring steel: Silicon-manganese spring steel is an alloy steel in which the molybdenum element in chromium-molybdenum spring steel is replaced with manganese and silicon. Silicon manganese spring steel has good elasticity and wear resistance and is suitable for manufacturing automobile suspension springs, industrial machinery springs, agricultural machinery springs, etc.

4. Vulcanized spring steel: Vulcanized spring steel is a special spring steel that is made by treating carburized spring steel with sulfur. Vulcanization treatment can improve the processing performance and heat treatment performance of steel, and is suitable for manufacturing cold stamping die springs, tension springs and spring coils, etc.

5. Molybdenum spring steel: Molybdenum spring steel is an alloy steel with molybdenum added to carbon spring steel. Molybdenum spring steel has higher strength and wear resistance, excellent fatigue resistance, and is suitable for manufacturing springs used under high load and high temperature conditions.

6. Nickel alloy spring steel: Nickel alloy spring steel is an alloy steel with a large amount of nickel added to the steel. Nickel alloy spring steel has good corrosion resistance and thermal stability, and is suitable for manufacturing springs used in high temperature and corrosive environments.

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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