Note: Stress relieving flat blanks of carbon steel to reduce wheel hardness
Objective:
Stress relieving flat blanks of carbon steel at a rate of 30 feet (9.1 m) per minute to reduce hardness from the outer 2 in (51 mm) on each side to eliminate cracking issues with the end product
End Product:
Carbon steel blanks
Equipment:
Ambrell EKOHEAT 200kW 10-30 kHz induction heating system equipped with a remote heat station containing eight 10 μF capacitors
A multiple turn split induction heating coil designed and developed specifically for this application
Materials:
Carbon steel flat blanks 5.7-10.2 in (145-259 mm) wide and 0.07-0.1 in (1.8-2.5 mm) thick
Temperature:
1200 °F (649 °C)
Frequency:
30 kHz
Testing:
Carbon steel flat blanks will run through an induction coil at a rate of 30 feet (9.1 m) per minute to temper or stress relieve carbon steel. During this process, the carbon steel will heat to 1200 °F (649 °C). This will be sufficient to remove work hardening from 2 in (51 mm) of each side of the width.
Benefits:
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Speed: Induction rapidly heats the carbon steel to temperature, which enables a rate of 30 feet per minute
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Efficiency: InductionâÂÂs rapid heating not only saves production time, it also saves energy costs
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Footprint: Induction takes up a modest footprint, so it can easily be implemented into production processes such as this one

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