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Wire Annealing Furnaces

Steel wire annealing furnaces are heat treatment systems used to relieve internal stresses that occur during wire production, improve the ductility of the wire, and homogenize its mechanical properties. The annealing process controls wire hardness and helps the wire acquire a structure suitable for subsequent forming processes. Wire annealing operations are generally performed in the temperature range of 400–750 °C depending on the steel grade and process requirements.

Wire annealing furnaces can be designed with or without atmosphere control depending on process requirements. Atmosphere-controlled systems ensure that the in-furnace environment is maintained under control throughout the annealing process.

At FURNOTECH, we offer wire annealing furnace solutions designed specifically for the process requirements of wire drawing and processing facilities, including continuous type, bell type, and chamber type furnaces.

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Continuous Wire Annealing Furnaces

 

Continuous wire annealing furnaces are annealing systems in which the wire is tensioned through rollers in a controlled manner, enters from one end of the furnace, and exits from the other end, being processed continuously without interruption. This furnace type is integrated into continuous production lines, enabling the wire to be annealed uninterruptedly throughout the line.

The furnace length varies depending on production capacity, wire diameter, and the process requirements to be applied; however, since the wire passes through the furnace in an uncoiled form and advances along a linear path, it is generally on the order of approximately 30 meters. Depending on process requirements, the furnace consists of heating, soaking, and cooling zones. The wire passes through these zones continuously until the annealing process is complete.

 

Application Area:

Preferred in industrial facilities with continuous production, high capacity, and production within specific diameter ranges.

Bell Type Wire Annealing Furnaces

 

Bell-type wire annealing furnaces are annealing systems that operate on the principle of stacking wire coils on a fixed base and covering them with a bell-shaped furnace body.
These furnaces can be designed to operate with natural gas, LPG, or electricity.

The heating system is determined based on the facility’s energy infrastructure and process requirements. Furnaces can operate according to the desired temperature recipe, providing precise temperature control throughout the annealing process. In some applications, circulation (convection) fans are used to increase the homogeneity of temperature distribution inside the furnace. After the annealing process is complete, wire coils are cooled in a controlled manner.

Bell-type wire annealing furnaces can be produced with or without atmosphere control. In atmosphere-controlled versions, inert gases are introduced inside the bell to create a controlled atmosphere, enabling the furnace atmosphere to be managed according to process requirements.

 

Application Area:

Preferred in industrial production facilities where steel wires of various diameters and alloy types need to be annealed, particularly where microstructure control, continuity of mechanical properties, surface color and quality, and process repeatability are of critical importance, and where atmosphere control in the process is required.

Chamber Type Wire Annealing

 

Chamber-type wire annealing furnaces are annealing systems that operate on the principle of loading wire coils into the furnace chamber volume — either via a bogie mechanism or using a crane or forklift onto a fixed furnace floor — closing the doors, and performing the annealing process within this enclosed volume. Depending on the facility infrastructure and site layout, these furnaces can be designed with single-door or double-door options. Wire coils remain stationary throughout the annealing process.

Chamber-type wire annealing furnaces can be designed to operate with natural gas, LPG, or electricity. The heating system is determined based on the facility’s energy infrastructure and process requirements. Furnaces can operate according to the desired temperature recipe, providing temperature control throughout the annealing process. Depending on the application, circulation fans may be used to improve the homogeneity of temperature distribution within the furnace. After the annealing process is complete, wire coils are cooled in a controlled manner.

Chamber-type wire annealing furnaces can be produced with or without atmosphere control. In atmosphere-controlled versions, inert gases are introduced into the furnace to create a controlled atmosphere, enabling the furnace atmosphere to be managed according to process requirements.

 

Application Area:

Preferred in medium and high-capacity production facilities with a moderate degree of product variety, where different wire diameters and quality grades need to be annealed. Due to its adaptable structure that can accommodate various process requirements, it is widely used in wire drawing and wire processing lines.