What is tempering?
Tempering
- Compression and extension springs are tempered in order to reduce the stresses indicated in the manufacture of the springs
- This prevents an uncontrolled loss of force in the operation of compression springs and prevents possible loop failure in extension springs
- For torsion springs, tempering is not absolutely necessary when loads are applied in the direction of rotation, which in any case is the only direction permitted according to technological principles
The following are standard values for tempering temperatures:
Materials
Music Wire 1.1200
- 250 °C to 280 °C- see data below
Stainless Steel 1.4310
- 350 °C - 0,5 hours
Stainless Steel 1.4568
- 400 °C 1,0 hours
Copper Beryllium 1.1266
- 310 bis 320°C - 2 hours
Inconel 2.4669
- dependent on service temperature and basic hardness of wire
Approximate time for tempering
- d~1mm > 5 minutes
- d~10-15 mm 10-25 minutes
- d~20mm >30 minutes