To work at high temperatures, metal springs need to have good resistance to relaxation, thermal stability, oxidation resistance, and a certain degree of corrosion resistance.

If the working temperature of the hardware spring is high, the elastic modulus of the material used to make the hardware spring will decrease, resulting in a decrease in the bearing capacity and stiffness of the spring. Therefore, in order for it to work at high temperatures, we need to know its rate of change and calculate the impact of reduced load capacity on spring performance. According to relevant regulations, if the temperature of a spring exceeds 60 degrees during use, the shear modulus of the spring needs to be adjusted.

When using spring steel to make springs, the hardness of the spring should be determined based on the magnitude of the stress carried by the spring and its performance. However, if plane strain fracture occurs, it may be due to hardness.

If springs are used on instruments or scales, most manufacturers will use a constant elastic alloy because its expansion coefficient changes very little, which is also to achieve its accuracy without being affected by temperature changes.

In the selection of materials, attention should be paid to the hardenability of steel, which is closely related to the quality of the spring.