Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a change in the crsytal structure, increasing the hardness and brittleness of the part. Induction hardening is used to selectively harden areas of a part or... We are enggaged to offer 1mm to 8mm depth on Hi Frequency progressive and Case Depth Induction hardening and kes depth induction hardening for 1mtr to 3 mtr long job.