Induction hardening

Induction hardening — the largest sub-contract facility in Britain

Induction hardening is a surface hardening technique with a proven record throughout industry. Its excellent controllability makes it a superior alternative to older surface hardening techniques.


  • Improves wear resistance

  • Improves strength

  • Improves resistance to fatigue

  • Works on an infinite variety of component shapes and sizes

  • ISO

    ISO 9001:2008 quality control system

How induction hardening works

Induction hardening passes a high frequency current through a suitably shaped inductor in close proximity to the surface to be hardened. The rapid current reversal induces eddy currents in the surface causing it to heat above the hardening (austenitizing) temperature. The inductor is passed slowly over the surface followed by a spray quench to achieve the rapid heating and cooling which results in hardening.



  • Prolongs component life
  • Saves on plant down time
  • Facilitates the use of smaller sections for a given load

Suitable materials

  • Most carbon-containing steels
  • Cast iron
  • Martenistic stainless steels

Hardness profile

  • Up to 65 R.C. surface hardness
  • Case depth from 0.5mm – 20mm

Range of components

  • Gears of all shapes and sizes
  • 25mm–4m diameter
  • Rolls or tubes up to 7m long
  • Cast iron slideways for machine tool industry
  • Components from 6mm diameter to 1000mm diameter

Microprocessor quality control

  • Ensures accuracy and reproducibility
  • Approved to ISO9001:2008