High Temperature Disc Springs (Spring Washers)
High temperature belleville washers, those disc springs required to function at high temperatures, use a variety of precipitation-hardened materials from the nickel-base alloys group.
- Industrial Furnaces & Ovens
- Chemical Industry
The high temperature springs are vastly ductile and exhibit very high fatigue strength. The lower tensile strength and adverse elastic limit – tensile strength ratio are important when designing disc springs made of high temperature material. If ignored, a high degree of setting loss is potential. An upper operating temperature limit is not viable to indicate and the overall spring height lessens under load due to creep.
The tangible level of creep is a function of temperature, time and stress.
For example, a disc spring can be used at higher temperatures if either a lower load is applied or the duration at the higher temperature is minimal.
High Temperature Materials
As a result, the values in (Table 5.1) are valuable references for the maximum temperatures at which the disc springs will demonstrate the same performance as at room temperature. The modulus of elasticity is somewhat lower at the upper temperature limit of the material. Therefore, disc springs produced with thermally stable materials can be used at temperatures approximately 150 °C higher than those acknowledged in(Table 5.1).
High temperature materials generally have long lead times from the steel mills and are typically very expensive. Nimonic 90 is better suited for extremely high temperatures than Inconel X 750 (or Inconel 718).
|High Temperature Materials for Disc Spring Material|
|Application profile||Material designation||DIN Material number||Modulus of elasticity at 20°C (N/mm2)||Max. material thickness (mm)||Operating temperature range (°C)||Lead time to obtain raw material||Typical application|
|High temperature||Inconel 718
Inconel X 750
|-200 to 500
-200 to 500
-200 to 600
|Boilers, industrial furnaces and ovens, chemical industry|
|1) Material no. 1.8159 also includes 51 CrV 4 2) with hot pre-setting this material may be used at temperatures up to approx 200°C 3) Material no. 1.4310 also includes X10 CrNi 19 9
* typically in stock ** 12-14 weeks, *** 14-16 weeks