Thermally stable materials

Most thermally stable materials are martempered steels. Because of their high alloy content, they exhibit a lower level of creep in the higher temperature ranges when compared with standard materials.

The upper operating temperatures stated in Table 5.1 are based on long term exposure to high temperatures. The springs may also be exposed to temperatures around 100° C higher than those listed for short periods (up to about 1 hour) without effecting their properties.

When designing disc springs, it must be kept in mind that the modulus of elasticity decreases as the temperature rises and increases as the temperature falls. For this reason,a disc spring will have a lower force at temperatures above room temperature and a higher force at temperatures below room temperature. For springs manufactured from thermally stable materials, it should be noted that premature failure due to brittle-fracture is possible.

X 35 CrMo 17 (1.4122)

X 35 CrMo 17 has a higher thermal stability due to the addition of molybdenum. This material is also corrosion-resistant when used in some applications. However, its corrosionb resistance is limited at the material strengths required for disc springs. In a sea-water or similar environment this material is not corrosion resistant.

X 22 CrMoV 12 1 (1.4923)

This material is a heat-treatable molybdenum and vanadium-containing thermally stable chrome steel for the application operating with a temperature range of -60° C to 350° C. X 22 CrMoV 12 1 may fail prematurely due to brittle-fracture.

The properties of the materials used by Mubea are listed in the following tables, and can be downloaded here:

» Download material properties tables as a .pdf document

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