induction quenching with special out-of-shape coil

 Induction quenching is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part. Induction quenching is used to selectively harden areas of a part or assembly without affecting the properties of the part as a whole.
Induction quenching is one of Induction heating's main application areas. Thousands of our quenching solutions are at work around the world—many of them within the automotive industry.

induction quenching with special out-of-shape coil