You can use 100KW power supply of ultra high frequency induction heating to heat treat ¢10mm-60mm shaft workpiece. And the depth of quenching is 0.5-1.2mm.
Specifications of 100KW Power Supply of Ultra High Frequency Induction Heating
name: 100KW Power Supply of Ultra High Frequency Induction Heating
XC-100KW
source: threephase 380V
Input power: 100KVA
Maximum input current: 150A
Oscillating frequency: 80-200KHZ
Work water pressure: 0.15-0.3Ma