High temperature resistant springs are springs made of special materials, suitable for working in a high temperature environment of 200℃-1000℃, and are mostly used in harsh working conditions such as automobiles, brazing furnaces, valves, electricity, and chemicals. High temperature resistant springs mainly include high temperature resistant compression springs, high temperature resistant wave springs, high temperature resistant extension springs, high temperature resistant torsion springs, high temperature resistant mold springs, high temperature resistant plate disc springs, etc. High-temperature spring technical standards: The mechanical industry standard of the People’s Republic of China JB/T 6655-93 high-temperature spring technical conditions has been replaced by JB/T 6655-2013.

Alloy spring steel (55CrSiA, 50CrVA,)

Stainless steel (301, 302, 304, 316, 17-7PH, 15-7Mo);

Special alloy steel (GH4145, GH4169, GH2132, GH4090, 30W4Cr2VA);

Imported brands (Inconel X-750, Inconel 718, Nimonic90), etc.

High temperature alloy materials are recommended for high temperature resistant springs above 400℃, and stainless steel materials can also be used for temperatures below 400℃

The recommended operating temperature of various materials of high temperature spring is shown in the following table:

High temperature resistant springs are generally used at higher temperatures. In addition to the usual creep and relaxation of springs used at high temperatures, the bonding force between atoms decreases due to the increase in molecular thermal motion. The quantitative values ??of the material's elastic modulus E and shear modulus G essentially reflect the bonding force between atoms, so the temperature rises and the distance between atoms increases, resulting in a decrease in E and G values. Generally, every time the temperature of steel increases by 100°C, the E and G values ??decrease by about 3%-6%. Because the elastic force and torque of the spring are directly proportional to the elastic modulus of the material, even if the geometric dimensions of the spring do not change at high temperatures, the elastic force and torque are lower than normal temperature. In the calculation, the G value can be estimated with reference to the following table: To