Bell Type Heat Treatment Furnace Features
Bell-Type Sealing Structure
The inner cover and furnace bell create a stable enclosed heating environment. This improves atmosphere control and helps maintain consistent annealing quality across the entire batch.
Uniform Heat Distribution
The circulation system ensures that heat is evenly distributed from the outer layers to the center of the wire coil, reducing uneven hardness and inconsistent metallurgical structure.
Controlled Protective Atmosphere
Optional atmosphere systems include:
- Nitrogen
- Hydrogen
- Cracked ammonia gas
The atmosphere control system helps minimize oxidation and supports cleaner wire surfaces after annealing.
Flexible Heating Options
Available heating configurations include:
- Electric heating
- Natural gas heating
The heating system can be selected according to local energy availability and operating cost considerations.
| Item | Specification |
|---|---|
| Furnace Type | Bell Type Wire Annealing Furnace |
| Application | Steel Wire Coils / Wire Rods |
| Batch Capacity | 2–40 Tons |
| Coil Diameter | 1800–4600 mm |
| Effective Height | 1800–4000 mm |
| Heating Method | Electric or Natural Gas |
| Working Temperature | 650–950°C |
| Protective Atmosphere | Nitrogen / Hydrogen / Cracked Ammonia |
| Control System | PLC Automatic Control |
| Optional Devices | Oxygen Probe / Hydrogen Analyzer |
Consistent Mechanical Properties
Stable temperature control and controlled atmosphere improve annealing consistency throughout the wire coil.
Improved Surface Quality
Protective atmosphere systems reduce scaling and oxidation during heat treatment.
Suitable for Multiple Wire Grades
The furnace can process different wire materials and coil sizes in batch production environments.
Energy-Efficient Batch Operation
The insulated bell structure reduces heat loss and improves thermal efficiency during long annealing cycles.
Reliable Industrial Performance
The furnace structure is designed for continuous industrial use with stable operation and simplified maintenance.
Typical Bell
Annealing Processes
Wire Softening Annealing
Reduces wire hardness and improves flexibility before drawing, forming, or cold heading operations.
Spheroidizing Annealing
Used for medium- and high-carbon steel wire to improve ductility and machining performance.
Stress Relief Annealing
Removes residual stress generated during rolling, drawing, or coiling processes.
Bright Annealing
With proper atmosphere protection, the furnace can help maintain cleaner wire surfaces and reduce oxide scale formation.
Bell Type Furnace Suitable Materials
The furnace is suitable for:
- Carbon steel wire coils
- Alloy steel wire rods
- Fastener wire materials
- Spring steel wire
- Bearing steel wire
- Stainless steel wire coils
- Copper and aluminum coils
The system can also be customized for special metal wire applications.
Industries Served
This bell-type wire annealing furnace is widely used in:
- Steel wire manufacturing plants
- Fastener production factories
- Spring wire processing companies
- Bearing material suppliers
- Wire drawing workshops
- Metal heat treatment service providers
FAQ
What types of wire materials can be annealed in this furnace?
The furnace is suitable for carbon steel wire, alloy steel wire, spring steel wire, stainless steel wire, and bearing steel wire coils.
Is the furnace suitable for large wire coil batches?
Yes. The bell-type structure is designed for medium and large batch annealing operations with heavy coil loads.
Can the furnace perform bright annealing?
Yes. With nitrogen, hydrogen, or cracked ammonia atmosphere protection, the furnace can reduce oxidation and improve wire surface cleanliness.
What is the typical annealing temperature?
The operating temperature usually ranges from 650°C to 950°C depending on the wire material and heat treatment process.
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