Induction heating applications for the continuous heating of pipes

Induction heating of pipes for drying, desiccation, painting, plastic surface coating

Liquids, paints, lubricants, polymeric coatings can be heated in a very effective way if they are or come into contact with induction-heated metal materials.

With induction heating, the direct heating by “skin effect” of a surface layer of parallel multi-wires is carried out, making the processes of drying, desiccation of lubricants, painting, galvanising and coating with polymers much quicker, repeatable with a limited use of space and energy compared to hot air or irradiation systems.

Induction heating system of steel pipes for subsequent electro-static powder painting

Impianto di riscaldo ad induzione di tubi in acciaio

Diameter: up to 170 mm
Thickness: up to 4.9 mm
Temperature: up to 200° C
Output: up to 4640 kg/h

Preheating

Induction preheating of pipes upstream of gas furnaces to increase production.

Induction preheating system of carbon steel pipes to increase the production of the gas furnace.

Diameter: up to 407 mm
Thickness: up to 52.5 mm
Temperature: up to 345°C

Heating for subsequent hot deformation machining

Annealing

When a metal (steel, copper, aluminium) is plastically deformed at rather low temperatures compared to the melting temperature, it produces:

a variation in grain configuration
work hardening
an increase in the density of dislocations

It is possible to completely or partially recover the state previously to the cold working through a particular annealing treatment called recrystallisation annealing.

TThis recovery of the original properties of the material is the result of two different processes that occur during the annealing heat treatment, the recovery (reorganisation) of the dislocations and the recrystallisation of the grains.

This type of annealing produces a new structure in the grains without phase changing.

Seam Annealing

Induction seam annealing of tubes and pipes.

The heat treatment of seam annealing of tubes and pipes is an important phase in the production process of steel pipes.

The temperature near the seam at the moment of welding is around 1500°C. From this maximum temperature, the steel cools when welding is finished and becomes certain temperatures that make the molecular structure completely distorted and it therefore requires annealing heat treatment to bring the welded workpiece back to its original condition before welding.

Solubilisation of austenitic steels

Consists of heating the steel at a sufficiently high temperature to remove the structural alterations due to manufacturing processes; remaining at this temperature for the time needed for all the carbides to go into a solution (especially the chromium ones), hence the name “solubilisation”, and then cooling it quickly to prevent the precipitation of the carbides that generally occurs between 850 → 450 °C.

Pipe annealing induction furnace

Diameter: up to 762 mm
Thickness: up to 30 mm
Temperature: impostabile up to 1180° C
Output: up to 2260 kg/h

System for continuous annealing through the progressive heating of stainless steel pipes

Diameter: up to 10 mm
Thickness: up to 3 mm
Maximum temperature: settable up to 1050° C
Output: up to 2260 kg/h

Continuous induction heating of stainless steel pipes

Diameter: up to 115 mm
Thickness: up to 3 mm
Temperature: up to 1100° C

Hardening and tempering

The main advantages of induction heating, compared to other systems, are the high thermal efficiency, fast heating in small spaces and the easy control of the operating parameters that allows to obtain precise repeatable and constant metallurgical characteristics over time.

All the factors mentioned above are the basis for the success of induction furnaces for the heat treatment of inline hardening and tempering of tubes and pipes.

Contact Ate for a quote or for more information about the continuous heating of pipes.

Keep in touch!

Call us

Write to us

Contact