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