Hardening is a process of heating followed by cooling generally fast for increase hardness and mechanical strength of steel. Induction hardening, using induction heating and quenching, provides an economical way to
process shafts, gears, bearings, yokes, spindles, sprockets, wire, tube, pipe or other parts.
Induction is a no-contact process that quickly produces intense, localized and controllable heat. With induction, only the part to be hardened is heated. Optimizing process parameters such as heating cycles, frequencies and
coil and quench design result in the best possible outcomes.
There are different methods for heating such as electric oven, flame, induction, etc. The steels that are normally used in induction hardening contain from 0.3% to 0.7% carbon (hypoeutectic steels).

Induction hardening can be done in two different ways:
Static (by single shot) Method: consists of setting the part in front of the inductor and carrying out the operation without moving either the part or the inductor. This type of operation is very fast, requires only simple mechanics and enables a very accurate localisation of the treated area, even with parts with complicated geometry.

Progressive (by scanning) Method: consists of going over the part with a continuous operation, moving either the part or the inductor. This kind of operation means that parts with large surfaces and large sizes can be
treated.

Advantages/Benefits of Hardening
• It treats specific parts of the workpiece without physical contact.
• Shorter time for the process with temperature control.
• Energy efficient process, since only a small portion of material is heated and uses less than 5% of mass treated to accomplish desired properties.
• Results will be accurate even on complex workpiece with contours or uneven geometries.
• It boosts throughput and is an extremely fast and repeatable process, highly popular in high volume production lines with strict quality requirements.