Continuous Roller Hearth Furnace by Therelek

Roller hearth furnaces are designed for continuous production and easy maintenance to handle large size and weights. Continuous Roller hearth furnace is used for the heat treatment of forging parts, bearing and semi-finished products.


Depending on the heat treatment required, the process can be under controlled atmosphere, for example, annealing of ball bearings should be carried out under controlled atmosphere to avoid adverse effects on the material.

Controlled atmosphere roller hearth furnace can be electrically heated or indirectly heated with a gas-fired radiant tube heater. The furnace is installed with entry lock, heated furnace chamber, holding and slow cooling zones, rapid cooling zones and if needed exit lock together with infeed and discharge conveyor rollers.

Electrically heated or gas-fired furnaces are available from temperatures ranging from 600°C to 1200°C. Can be air-cooled with atmosphere circulation post heating, cooling via water circulation or fast cooling by atmospheric gas recirculation (convective cooling) is possible.

Quench rates are rapid and uniformity is highly maintained to ensure minimal distortion. Process – hardening, carburizing, carbonitriding, annealing, normalizing, stress relieving, tempering, ageing. Best suited for the heat treatment of piping, automotive, aerospace, Tubing, Castings, Forging, Precision components, bearings, gear parts.

More about Roller Hearth Furnace:

Roller hearth furnaces are used for soft annealing of high-speed steels, high alloy steels, cold heating and bearing steels. The design is engineered in such a way that it minimizes atmosphere consumption to improve the economy. The control systems are used to calculate the process atmosphere. Various applications like annealing, hardening, preheating, normalizing and stress relieving are carried out in roller hearth furnace.

Due to the versatile and efficient configuration, the smaller products are sent using a tray or basket and the larger products are directly sent on the furnace hearth for processing. The hearth is made of steel or ceramic rolls supported and driven externally from the furnace chamber. Continuous roller hearth furnaces come with electrically heated or gas-fired configurations based on customer requirement.

Roller hearth furnaces are used in the heat treatment of bearing parts as well other semi-finished goods like automotive & aerospace components, tubing, castings, bar stock, forgings, railroad components, precision machined components, gear parts etc. These furnaces can handle heavy loads in high volumes dues to its smooth movement of rolls.

Roller hearth furnaces move the workpiece through the hot zone with powered shaft-mounted rollers that contact the workpieces or trays. Hence this type of furnace is used in the heating of long slabs wish is not possible through pusher type and walking beam furnace. These furnaces are used as single units for zone heating or cooling in a line of furnaces.

  • Roller hearth furnaces are used in applications like Annealing, Stress Relieving, Hardening, Tempering, Normalizing, Brazing, Carburizing, Sintering.
  • Our furnaces are designed to reduce roll pickup and produce high quality material with uniformity.

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Features & Specifications

Title Description
Temperature Range Up to 1200°C
Insulation Vacuum Formed Ceramic Fibre Boards / Ceramic Fibre Blanket & Module / Refractory Brick Lining
Heating Media Options Electric / Gas Fired / Oil Fired
Heating Elements Nichrome Wire / Special Alloy Resistance Heating Wire / Silicon Carbide Rod Type
Furnace Classification Class 2 / Class 3
Instrumentation options Thyristor, Programmable Temperature Controller, Temperature Recorder, PLC, SCADA, HMI




Heat Treatment Applications

  • Hardening
  • Annealing
  • Isothermal Annealing
  • Stress Relieving
  • Normalizing
  • Case Hardening


Expensive forged or machined parts can frequently be replaced by copper brazed assemblies of stamped parts.  In many cases, the copper brazed parts offer a quality improvement as well as a cost reduction.  Copper brazing furnaces are operated with a reducing atmosphere to prevent oxides from interfering with the brazing operation.

Why Choose Therelek Engineers?

The answer is simple, Therelek is the best in the business when it comes to custom built furnaces and commercial heat treatment. Customer satisfaction is a guarantee at Therelek.

Through continuous innovation, we have achieved both consistent quality and an impressive clientele across the globe; some of them have been working with us for many years now.

What you avail from us is not just a product but a trustworthy and beneficial vehicle for your success. No matter what the size or sector of your company is, when you work with Therelek, you can be rest assured.

More about Roller Hearth Furnace


  • Electrically heated
  • Gas Fired


  • Stress relief annealing of castings or forgings
  • Low operating costs and long component life
  • Easy and safe operation and process repeatability
  • Convenient access to controls and maintenance items
  • Improve the wear resistance and prevent deformation under impact on gears, crank shafts, camshafts, etc.
  • Ideal for full anneal of steel casings to improve machinability.


What is a roller hearth furnace?

Roller Hearth Furnaces are a very versatile, efficient configuration, mostly used for index moving of workload baskets. They can also be set up in an oscillating configuration for long heating cycles on very long stock such as pipe, tubing, strip, and slabs.

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