Heat Treatment

Induction Surface Hardening

Induction Surface Hardening is a type of heat treatment that heats up metallic materials and cools them down with polymer emulsion. Mechanical parts that have been exposed to abrasion are hardened through this process in order to gain strength and be resistant to abrassion.

Induction Hardening Capacity

The maximum workpiece height

8500 mm

The maximum hardening course

7000 mm

The maximum hardness depth

25 mm

The maximum workpiece weight

30 ton


The maximum diameter for hollow workpiece (ring gears, slewing bearings, etc.)

8500 mm

The maximum diameter for stock workpiece (rolls, shafts, etc.)

1300 mm

The maximum distance between head and tail stocks

8000 mm

Induction Hardening Line Details


14 Induction hardening units

Medium frequency converter group
8 units (1000, 500, 2x 250, 200, 3x 100 kW)

High frequency converter group
6 units (65, 2x 50, 40 , 18, 12 kW)

  • In house designed and manufactured semi and fully automated hardening machines
  • 3.2 MW power supply (2x 1.6 MW)
  • 1 MW chiller
  • 2x 200 tons of water and polymer tank
  • Fully automated pumping system over 150 kW for polymer quenchant
  • Over 5000 inductor and quenching showers


Annealing is a heat treatment wherein a material is altered, causing changes in its properties such as hardness and ductility. It is a process that produces conditions by heating to above the critical temperature,maintaining a suitable temperature, and then cooling. Annealing is used to induce ductility, soften material, relieve internal stresses, refine the structure by making it
homogeneous, and improve cold working properties.


Tempering is a process of heat treating, which is performed after hardening metals, to reduce some of the excess hardness, and is done by heating the metal to a much lower temperature than was used for hardening. The exact temperature determines the amount of hardness removed, and depends on both the specific composition of the alloy and on the desired properties in the finished product.

Stress Relieving

Stress Relieving consists of heating the steel to a temperature below the critical range to relieve the stresses resulting from cold working, shearing, or gas cutting. It is not intended to alter the microstructure or mechanical properties significantly. However stress relieving does not change the material properties as does annealing and normalizing. A material can be stress relieved by heating it to a specific temperature that is lower than that of annealing or normalizing and letting it cool down to room temperature inside or outside of the furnace. This heat treatment is typically used on parts that have been severely stressed during fabrication.

Tempering and Stress RelievingFurnace Capacity

6500 x 1350 x 1250 mm (L W H)

550 °C

Charge Weight
40 Ton

Other Induction Heating Services

Powder paint & plastic coating
Assembling and disassembling of shrink fitted parts

Advantages of Induction Heat Treatment

  • Deformation and distortion are at minimum levels.
  • Duration of hardening process is short.
  • Higher level of repeatability of hardening after parameters are set.
  • Creating a high martensitic environment through rapid cooling.
  • After prolonged tempering it reaches a fine grain structure.
  • Hardness depth is at desired levels and case depth is homogeneous.
  • It is possible to do local hardening when hardening in furnace is not a practical option for large pieces.
  • In respect to other heat treatment operations when heating and cooling processes are taken into consideration, effective environmental parameters generate remarkable superiority. 
  • Relatively cleaner process in comparison to with other heat treatment processes. It offers a clean final item (smooth surface, plating, etc.) and this quality serves as an advantage in consecutive operations.
  • Induction hardening can be applied to normally, medium level carbon steels. (% 0,35-60 C), a variety of steel types (including stainless steel) and spheroid casted materials as well.


*These are the most suitable steel groups for induction hardening. There is a risk of failure to reachi the level of hardness with lower carbon steels and possible cracks with higher carbon steels.

**High quality spheroid cast materials (GGG 50-70) are among the materials that can be hardened by induction.