Heat treating (or heat treatment) is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, normalizing and quenching.

Additional information

Isothermal annealing

For forgings and cementation materials, it is performed in flow furnaces in a protective atmosphere with automatic process control
max. outer diameter øD = 600 mm
max. length L = 600 mm
max. visina dela H=350 mm
max. weight G = 160 daN


Single-chamber furnaces with arc heaters without protective atmosphere
max. length of work L = 2.000 mm

Differential hardening

Used to cool the rotating parts
max. external diameter øD = 400 mm

Induction hardening

Hardening of gears, toothed shafts, axles, ranges:
module 10÷30 m
max. diameter øD = 4000 mm
max. height H = 2,500 mm
max. weight of work G = 5,000 daN
Axles hardening:
diameter of the layer øD= 15 ÷ 80 mm
max. lenght of the layer L=700 mm

Flame hardening

Hardening of gears, sprockets, ranges:
modul 10÷30 m
max. diameter øD = 4000 mm
max. height H = 2,500 mm
max. weight of work G = 5,000 daN

Axle hardening:
max. diameter øD = 150 mm
max. length of work L = 1.750 mm

Hardening of the wheels and rims:
diameter øD = 200 ÷ 1,200 mm
max. width of the hardened layer b = 80 mm
max lenght of the hardened layer l=300mm

Hardening under pressure

max. external diameter øD = 650 mm
max. visina dela H=200 mm

Cementation (carburizing)

It is performed on deep furnaces, two-chamber automatic machines and one-chamber furnaces:
depth of the cement layer 0,3÷2,0 mm
max. external diameter of work øD=900 mm
maximum length of work L=1.600 mm

Ion nitration

Ion plasma nitride vacuum in order to increase the hardness of the surface, wear resistance, hardness of the hard layer, dynamic durability, strength at elevated temperatures in parts of structural, alloyed, tool and fire resistant steels after final machining without changing the dimensions:
hardness of the surface od 500÷1.200 HV
depth of the diffusion layer od 0,1÷0,4 mm
max. working diameter søD= 600 mm
max. length of work L=1.100 mm
max. težina dela G= 600 daN


In one-chamber and two-chamber ovens:
max. external diameter øD = 1.500 mm
max. height H = 500 mm
max. length of work L=2.200 mm