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:

  • Speed: Induction rapidly heats the carbon steel to temperature, which enables a rate of 30 feet per minute

  • Efficiency: Induction’s rapid heating not only saves production time, it also saves energy costs

  • Footprint: Induction takes up a modest footprint, so it can easily be implemented into production processes such as this one 

Stress relieving flat blanks of carbon steel to reduce wheel hardness

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