Spring Materials

Considering the working environment, take temperature conditions as an example. At low temperatures, the elastic modulus and expansion coefficient of the material do not change much, and the environmental medium is less corrosive to the material than normal temperature, so the above factors do not need to be considered in the design. What should pay attention to is the brittleness of the material, and low temperature is very sensitive to surface defects, so the quality of the surface of the material must be strictly controlled. In addition, it should have good low temperature toughness. For example, austenitic stainless steel such as piano wire, copper alloy, nickel alloy, 1Cr18Ni9, etc., all have good low temperature strength and toughness, and they are all good choices.

The spring material working at high temperature must have good thermal stability, oxidation resistance, corrosion resistance, relaxation resistance or creep resistance. When the operating temperature increases, the elastic modulus of the spring material decreases, resulting in a decrease in rigidity and a decrease in load-bearing capacity. Therefore, the spring under high temperature must understand the rate of change of its elastic modulus, and calculate the effect of the decrease of its load-bearing capacity on its performance.