Bell Type Annealing Furnace solution
Unlike conventional chamber furnaces that heat coils from the outside inward, a bell furnace creates a controlled thermal environment around the entire load. The heating system and atmosphere circulation work together to ensure that temperature differences between inner and outer coil layers are minimized.As a result, steel coils achieve more consistent hardness, grain structure, ductility, and downstream processing performance.Typical Products Processed
- Cold rolled steel coils
- Carbon steel coils
- Alloy steel coils
- Stainless steel coils
- Electrical steel coils
- Precision strip coils
- Copper and aluminum coils
Bell Type Annealing Furnace Feature
Consistent Mechanical Properties
Uniform temperature distribution helps achieve stable tensile strength, elongation, and hardness throughout the coil.
Improved Coil Quality
Controlled atmosphere operation minimizes oxidation and surface contamination during long annealing cycles.
Flexible Production Scheduling
Multiple bases can operate with shared heating bells, allowing efficient batch management and improved furnace utilization.
Wide Coil Size Range
The system accommodates different coil diameters, heights, and weights according to production requirements.
Annealing Furnace Specifications
| Parameter | Typical Range |
|---|---|
| Furnace Type | Bell Furnace |
| Application | Steel Coil Annealing |
| Coil Capacity | 2–40 Tons per Batch |
| Coil Diameter | 1800–4600 mm |
| Effective Height | 1800–4000 mm |
| Heating Method | Electric or Natural Gas |
| Temperature Range | Up to 950°C |
| Atmosphere Type | N₂, H₂, Cracked Ammonia |
| Control System | PLC + Touchscreen |
| Custom Design | Available |
Bell Type Annealing Heat Treatment Furnace Process
Heating Base
The base supports the coil load and serves as the connection point for atmosphere circulation and temperature monitoring systems.Inner Cover
The inner cover isolates the load from ambient air, creating a stable protective atmosphere during the annealing cycle.Heating Bell
The heating bell surrounds the inner cover and provides controlled thermal energy to the entire load.
Frequently Asked Questions
1.What is the difference between a bell furnace and a continuous annealing line?
A bell furnace processes coils in batches, while a continuous line treats strip material as it moves through the furnace. Bell furnaces provide greater flexibility for varying coil sizes and steel grades.
2.Can the furnace process stainless steel coils?
Yes. The furnace can be configured for stainless steel annealing with appropriate protective atmosphere systems.
3.What coil weight can the furnace handle?
Standard systems typically process between 2 and 40 tons per batch, with larger custom configurations available.
4.Is hydrogen atmosphere available?
Yes. Hydrogen and nitrogen-hydrogen atmosphere systems can be supplied according to process requirements and local safety regulations.
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