Spring steel has a coefficient. If our compressed self reaches its limit, it will damage the spring, and it will no longer have the ability to bounce back. Therefore, when using a spring, it is first necessary to know the spring coefficient. Another parameter is the compression amount or compression height of the spring.

Another prerequisite is to be aware of the properties of other steels. As you all should know, most are soft and can be easily processed without heat treatment. After processing, heat treatment is conducted. Following heat treatment, the steel becomes generally hard, with no increase in strength and poor ductility.

At this point, steel is not prone to bending; our debts will only break, not bend or deform. At this stage, we refer to this as the rigidity of the material; it's quite rigid, but lacks flexibility. In such cases, steel rarely experiences elastic deformation.

Spring steel is an exception. It can typically be heat treated, resulting in a material that does not become excessively rigid after processing. It exhibits significant elastic deformation due to its long service life and strong resistance to fatigue.

So, this spring steel is a different type of steel. It seems that spring steel can only be used as a spring. It merely indicates that it was originally intended for spring use, but as people have come to understand its properties, they have discovered that spring steel can also be used elsewhere.

Springs are standard components formed by utilizing the spatial variables of part deformation. If the space for such deformation variables is eliminated in the design, the material will possess some elasticity; however, due to the lack of space for elastic release, the fatigue strength of the workpiece will increase.