Induction Hardening

Induction Hardening Process

How does it work?

Induction hardening is a form of case hardening where the surface of the material is heated to appropriate hardening temperature by the use of a magnetic field. This is then followed by rapid cooling which hardens the material. By controlling power, frequency and heating time it is possible to precisely control the depth of the hardened case.


From its original use in hardening  crank shafts of internal combustion engines, use of induction hardening has spread to most of the automotive components: cam shafts, axles, CV Joints, transmission gears etc.

Other applications are parts for the earthmoving industry and mining: pins, bushes, sprockets, rollers, idler wheels, track links/shoes and many others.


There are a number of advantages that induction hardening has over conventional case hardening:

Induction hardening works with a wide range of materials which gives the design engineer greater flexibility.

Deeper case depth:
The case for conventional case hardening rarely exceeds 3mm due to the cycle duration (can take days to achieve deeper cases). Induction hardening however, can easily go up to 20mm.

Looking at the flexibility in materials, distortion control, deeper case depth and much shorter cycle times, significant savings are possible when induction hardening process is selected.