1. Carbon spring steel

   This kind of spring (such as No. 65, No. 70 steel, etc.) has the advantages of low cost and convenient source of raw materials. The disadvantage is that the elastic limit is low and it is easy to lose elasticity after repeated deformation. It cannot be cut at temperatures below 130 degrees. environment to work normally.

2. Low manganese spring steel

   Compared with carbon steel, this kind of spring steel (such as 65Mn) has the advantage of significantly better hardenability and strength, but it also has obvious shortcomings such as cracks and thermal brittleness after quenching. However, because it is cheap, it is often used in the manufacture of springs that are not large in general machinery, such as clutch springs.

3. Silicon manganese spring steel

   This type of spring steel (such as 60Si2Mn), because it contains silicon, has a significantly improved elastic limit and improved tempering stability, so it can be tempered at a higher temperature to obtain good mechanical properties. . Silicon manganese spring steel is widely used in industrial manufacturing, including the manufacturing of coil springs for automobiles and tractors.

4. Chromium vanadium steel

   The purpose of adding vanadium to this kind of steel (such as 50CrVA) is to refine the structure and improve the strength and toughness of the steel. This material has good fatigue and impact resistance and can work stably at temperatures from -40 degrees to 210 degrees, but it is usually more expensive. It is generally used in occasions with higher requirements, such as the production and manufacturing of springs in aero-engine adjustment systems.