For springs to work stably at high temperatures, they must have excellent relaxation resistance, thermal stability, and oxidation resistance, as well as a certain level of corrosion resistance. Why is this?

When a spring operates at elevated temperatures, the elastic modulus of the material decreases, which reduces the spring's load-bearing capacity and stiffness. Therefore, to ensure reliable high-temperature performance, we need to know the rate of change and calculate how the reduced load capacity affects the spring's service performance. According to relevant regulations, for springs operating above 60°C, the shear modulus must be adjusted accordingly.

When selecting spring steel for spring manufacturing, hardness should be determined based on the magnitude and nature of the stress the spring bears. If planar strain fracture occurs, it may indicate a hardness-related issue.

When springs are used in instruments or measuring equipment, most manufacturers use constant-elasticity alloys because their coefficient of expansion changes very little — ensuring measurement accuracy is not affected by temperature changes.

During material selection, the hardenability of the steel is an important consideration, as it significantly affects the overall quality of the spring.