Bell-Type Annealing Furnace for Stainless Steel Strip
Compared with conventional batch furnaces, the bell-type structure provides better atmosphere sealing and more uniform heating performance for stainless steel strip coils. It is especially suitable for manufacturers handling medium and large coil batches.
Typical Applications
- Stainless steel strip annealing
- Stainless steel coil solution treatment
- Bright annealing for cold rolled strip
- Stress relieving of precision strip materials
- Annealing of stainless steel coils before slitting or rolling
Applicable materials include:
- 200 series stainless steel
- 300 series stainless steel
- 400 series stainless steel
- Precision stainless strip
- Nickel alloy strip and special alloys
Roller Hearth Heat Treatment Furnace Features
Uniform Heating Performance
The furnace adopts optimized hot gas circulation and insulated bell structure to ensure even temperature distribution throughout the coil load. This helps reduce internal stress and improves strip flatness after annealing.
PLC Automatic Control
The system uses industrial PLC temperature control with programmable annealing cycles for stable and repeatable production.
Protective Atmosphere System
The furnace can operate with:
- Nitrogen atmosphere
- Hydrogen atmosphere
- Cracked ammonia gas
The controlled atmosphere minimizes oxidation and helps achieve cleaner strip surfaces during heat treatment.
Energy-Efficient Operation
Available heating options include:
- Electric heating
- Natural gas heating
The thermal insulation structure helps reduce heat loss and operating costs.
| Item | Specification |
|---|---|
| Furnace Type | Bell-Type Annealing Furnace |
| Application | Stainless Steel Strip / Coil |
| Heating Method | Electricity or Natural Gas |
| Protective Atmosphere | Nitrogen / Hydrogen / Cracked Ammonia |
| Working Temperature | 650–950°C |
| Coil Diameter | 1800–4600 mm |
| Effective Height | 1800–4000 mm |
| Batch Capacity | 2–40 tons per batch |
| Control System | PLC Automatic Control |
| Optional System | Oxygen Probe / Hydrogen Analyzer |
Improved Surface Quality
The controlled atmosphere reduces oxidation during annealing, helping maintain a cleaner and brighter strip surface.
Stable Mechanical Properties
Precise thermal control improves consistency in hardness, ductility, and grain structure across the stainless steel strip coil.
Suitable for Batch Coil Annealing
For manufacturers processing stainless steel strip in batch production rather than continuous lines, the bell-type furnace offers a practical and cost-effective solution.
Lower Maintenance Requirements
The modular furnace structure simplifies maintenance and supports long-term industrial operation.
Industries Served
Our stainless steel strip annealing furnaces are widely used in:
- Stainless steel strip manufacturing plants
- Cold rolling mills
- Precision metal processing factories
- Coil service centers
- Industrial material suppliers
Why Choose Our Bell-Type Annealing Furnace
- Experience in industrial heat treatment systems
- Custom engineering support
- Stable furnace atmosphere control
- Reliable temperature uniformity
- Flexible furnace sizing
- Technical support for installation and commissioning
Request Technical Consultation
If you are looking for a reliable annealing furnace for stainless steel strip or coil processing, our engineering team can help you select the appropriate furnace configuration based on your production requirements.
Please contact us with:
- Strip material grade
- Coil dimensions
- Production capacity
- Heating preference
- Atmosphere requirements
- Temperature range
We will provide a suitable furnace solution and technical proposal for your application.
FAQ
1. What types of stainless steel strip can be processed in this furnace?
The bell-type annealing furnace is suitable for various stainless steel grades, including:
200 series
300 series
400 series
Precision stainless steel strip
Nickel alloy strip
The furnace can also be customized for special alloy materials and different strip thickness requirements.
2. Is this furnace suitable for bright annealing?
Yes. The furnace can operate with protective atmospheres such as nitrogen, hydrogen, or cracked ammonia gas to reduce oxidation during heat treatment.
For applications requiring brighter strip surfaces, atmosphere purity and dew point control can be configured according to process requirements.
3. What is the difference between a bell-type furnace and a continuous annealing furnace?
A bell-type furnace is mainly used for batch annealing of stainless steel strip coils, while a continuous annealing furnace is designed for high-volume continuous strip production.
Bell-type furnaces are generally preferred for:
Flexible batch production
Multiple material grades
Medium production capacity
Lower initial investment
Continuous lines are more suitable for large-scale strip manufacturing operations.
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