Note: Annealing a steel shaft for stress relief

Objective:

Heating a steel rod to 1200ºF (649ºC) for an annealing, stress relief application 

End Product:

Steel shaft

Equipment:

  • Ambrell 45 kW induction heating system, equipped with a remote workhead containing eight 1.0 µF capacitors for a total of 8.0 µF
  • An induction heating coil designed and developed specifically for this application. 

Materials:

  • 1.062” (26.97mm) dia type T-410 stainless steel bar 6’ (1.82m) long
  • 1.25” (31.75mm) dia T-416 stainless steel bar 6’ (1.82m) long 

Temperature:

1200ºF (649ºC)

Frequency:

126 kHz

Testing:

A two position 8 turn helical parallel coil is used to heat the stainless steel rod for 30 seconds to reach the requested 1200ºF (649ºC). 

Benefits:

Induction heating benefits:

  • Process currently done in batch furnaces, induction heating allows process to be done in-line saving time and energy.

  • No rotation of part needed

  • Flameless process

Annealing a steel shaft for stress relief

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