The spring material working at high temperature requires good thermal stability, relaxation or creep resistance, oxidation resistance and corrosion resistance
When the working temperature of spring increases, the elastic modulus of spring material decreases, resulting in the decrease of stiffness and bearing capacity
Therefore, the spring working at high temperature must know the change rate (value) of elastic modulus, and calculate the influence of the decline of spring bearing capacity on the service performance. According to the provisions of GB 1239, when the working temperature of ordinary spiral spring exceeds 60 ℃, the shear modulus should be corrected, and the formula is: GT = KTG, where G is the elastic modulus at normal temperature; GT is the shear modulus under the working temperature T; when the working temperature is higher than 60 ℃, the shear modulus should be corrected; KT — temperature correction coefficient is selected according to table 2-98
The spring materials used at low temperature should have good low temperature toughness. Carbon spring steel wire, piano steel wire and 1Cr18Ni9 austenitic stainless steel spring steel wire, copper alloy and nickel alloy have good low temperature toughness and strength