Relationship between induction frequency and quenching depth (hardening depth)

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The quenching depth (hardening depth) depends on the output frequency of induction heater. Generally, higher frequency will bring smaller quenching depth (shallower).
The relationship between the frequency f and the heating depth δ has the following empirical formula:
δ=20/√f(20°C)；δ=500/√f(800°C)。
Where: f is the frequency, the unit is Hz; δ is the quenching depth, the unit is millimeter (mm).
The relationship between the output frequency and the quenching depth (the cooling medium is tap water) at 800 °C is shown in the table below:

d/mm f/KHZ
0.76 450
1.14 200
2.11 100
2.26 50
3.20 25
5.08 10
9.27 3
16.05 1
22.71 0.5
37.85 0.18
65.53 0.06


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  • 2019/5/15 4:14:42Anonymous
    very useful, big help for me, tks!

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