Induction heating applications for wires, strands, ropes, strips and profiles

Stabilisation heat treatment
for steel wires and strands

Stabilisation induction heat treatment is applied to reduce slackening in steel wires, braids and strands for prestressed reinforced concrete used in building large-sized structures and prefabricated elements as bridges, tunnels, viaducts, dams, geotechnical rods and railway sleepers.

System for the induction treatment of strands for prestressed reinforced concrete

Strand dimensions: up to 7/10” (sections up to 200 mm²)
Wire dimensions: up to 11 mm
Braid dimensions: up to 3 x Ø = 3 mm
Treatment temperature: < 420˚C
Output: up to 11500 kg/h

Induction heating for the drying, desiccation, plastic surface coating of wires, strands, strips and profiles.

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.

Stations of continuous surface heating of steel wires for lubricant desiccation (borax, stearate, etc.) before drawing.

Wire diameters: up to 15 mm
Temperature: up to 200˚C
Output: up to 2500 kg/h

Induction heating for subsequent plastic coating of steel strands, cables.

Continuous heating unit of steel cables for subsequent plastic coating.

Cable diameters: up to 76 mm
Temperature: up to 160°C
Output: up to 2500 kg/h

Annealing heat treatment to relieve stress of steel wires, strips and profiles

Stress relief annealing has the purpose of reducing internal tension as much as possible, due to:

cold plastic deformation
mechanical machining

These internal tensions (work hardening) make the material hard and fragile, so subsequent machining could be difficult.

With annealing heat treatment, internal tensions, fragility and hardness are reduced, making subsequent mechanical machining possible.

Systems for the continuous heat treatment to relieve stress in steel strips and profiles.

Dimensions: strips e profiles with sections up to 200 mm²
Treatment temperature: up to 700°C
Output: up to 3200 kg/h

Heating system for the heat treatment of smooth or ribbed steel wires.

Dimensions: diameters up to 14 mm
Treatment temperature: up to 450°C
Output: up to 11000 kg/h

Heating system for the heat treatment of steel wires for electro-welded mesh.

Dimensions: diameters up to 10 mm
Treatment temperature: up to 450°C
Output: up to 1500 kg/h

Induction heating for tempering the surface martensite on steel wires

During the peeling to size of steel wires, an undesired variation of the microstructure on the surface can be caused.

In particular, a hard and non-malleable surface martensite can be formed that could hinder the following machining.

By using the skin effect phenomenon, typical of induction heating, it is possible to selectively temper the altered layer.

Induction system for continuous tempering of surface martensite on steel wires.

Dimensions: diameters up to 10 mm
Treatment temperature: up to 700°C only on a thin surface layer of the wire
Output: up to 4900 kg/h

Induction systems for the tempering and hardening heat treatment of steel wires, profiles and strips

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 profiles and wires for the production of springs.

Induction systems for the tempering and hardening heat treatment of steel profiles and strips

Profiles: A
Profiles: B
Profiles: C
Strips: up to 16 x 6 mm
Temperatures: Hardening up to 1000˚C – Tempering up to 620˚C
Output: up to 2000 kg/h

Tempering and hardening heat treatment of steel wires for springs

System for the hardening and tempering heat treatment of steel wires for springs

Wire dimensions: diameters up to 15,9 mm
Treatment temperature: Hardening section: up to 1000° C Tempering section: up to 600° C
Output: up to 3090 kg/h

Patenting heat treatments of steel wires

Patenting is a treatment intended for steel rich in carbon, to which it confers exceptional ductility combined with discreet hardness. This process is carried out continuously on steel wires for cables, springs and for cold rolling with high reduction ratios, without any intermediate annealing.

Systems for austenitising heat treatment and temperature maintenance in inert gas before cooling in a molten lead bath.

Wire diameters: up to 26 mm
Treatment temperature: Austenitising section: up to 1150 °C Maintenance section: up to 1150 °C
Output: up to 2250 kg/h

Induction heating for subsequent hot rolling of steel wires

The use of induction heating for subsequent rolling of steel wires and bars is a practice that is spreading among producers of hot-rolled sections that use small rolling mills.

System for the induction heating for subsequent hot rolling of steel wires

Wire diameters: up to 22.5 mm
Treatment temperature: up to 1050˚C
Output: up to 10000 kg/h