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Mesh Belt Heat Treatment Oven
CDO CONTINUOUS HEAT TREATMENT SYSTEM
CDO-8255 Continuous Mesh Belt Carburizing, Quenching and Tempering Line
The CDO-8255 is a continuous methanol-propane atmosphere heat treatment production line for carburizing, carbonitriding, conditioning, quenching and tempering. It is engineered for stable mass production of fasteners, bearings, chains, hardware tools and automotive or bicycle components.
- CDO-8255
- Electric-heated series
- CDO-8255GAS
- Gas-heated series
- 48-1,980 kg/h
- Reference output range by steel grade
- Up to 43,430 mm
- Reference complete-line length
What Is the CDO-8255 Continuous Heat Treatment Line?
The CDO-8255 is a liquid-quenching continuous heat treatment system. Parts are loaded uniformly onto a heat-resistant mesh belt and transported through pre-cleaning, atmosphere heating, carburizing or conditioning, quenching, after-cleaning and tempering stages. Continuous belt speed, zone temperature, atmosphere flow and quench conditions are coordinated to obtain repeatable hardness, case depth and surface quality.
- Main processes
- Carburizing, carbonitriding, hardening, quenching, tempering and conditioning.
- Process atmosphere
- Methanol-propane or another engineered protective/process atmosphere.
- Heating options
- Electric resistance heating or gas-fired heating with heat recovery.
- Typical workpieces
- Fasteners, bearings, chains, tools, hardware and vehicle parts.
Continuous Mesh Belt Transport
Uniform loading and controlled belt speed establish the residence time and hourly output. Parts should be distributed without excessive overlap.
Multi-Zone Temperature Control
Independent heating zones and PLC/PID control maintain the required heating and soaking curve for stable continuous production.
Atmosphere Carburizing
Methanol and propane can be used to form the process atmosphere. Gas ratio, furnace pressure and carbon potential are selected from the steel grade and required case depth.
Integrated Quenching and Tempering
The heated parts enter the configured liquid-quench section, followed by washing and tempering to obtain the specified mechanical properties.
Electric and Gas-Heated CDO-8255 Series
Choose the heating system according to local energy cost, plant utilities, output and installation conditions.
CDO-8255 Electric Series
Electric resistance heating provides clean operation and direct multi-zone control. The reference range covers CDO-8255-A through CDO-8255-8.
- Reference output: 48-1,980 kg/h, depending on steel grade
- Installed power: 177-1,175 kW
- Reference line length: 25,495-43,430 mm
- Best for: plants prioritizing clean heating and precise electrical control
CDO-8255GAS Series
Gas-fired models use imported or equivalent industrial burners, a dual-duct structure and a built-in heat exchanger for combustion-air and exhaust-energy management.
- Reference output: 413-1,980 kg/h, depending on steel grade
- Mesh belt width: 800 or 1,200 mm
- Heating length: 6,000-12,000 mm
- Burner capacity: 180,000-690,000 kcal/h
Continuous Carburizing and Quenching Process Flow
The exact modules are selected according to the material, cleanliness, case-depth and final hardness requirements.
Automatic Feeding
Metered loading distributes components on the mesh belt.
Pre-Washing
Oil and contaminants are removed before atmosphere heating.
Carburizing Furnace
Parts are heated and soaked in the controlled process atmosphere.
Liquid Quenching
Hot parts enter the specified oil or other liquid-quench system.
After-Washing
Residual quench medium is removed before tempering.
Tempering Furnace
Tempering adjusts hardness, toughness and dimensional stability.
Cooling and Discharge
Finished parts are cooled and transferred for inspection.
CDO-8255 Electric Mesh Belt Furnace Specifications
| Model | High/Medium-Carbon Steel Output (kg/h) | Monthly Output (t) | Low-Carbon Steel Output (kg/h) | Monthly Output (t) | Installed Power (kW) | Reference Operating Power 85% / 70% (kW) | Total Line Length (mm) |
|---|---|---|---|---|---|---|---|
| CDO-8255-A | 124-138 | 77-86 | 48-69 | 30-43 | 177-183 | 150 / 123 | 25,495 |
| CDO-8255-1 | 198-220 | 123-138 | 84-120 | 52-75 | 203-218 | 173 / 142 | 27,995 |
| CDO-8255-2 | 352-385 | 220-242 | 204-240 | 127-150 | 290-320 | 247 / 203 | 31,495 |
| CDO-8255-3 | 414-483 | 259-299 | 313-350 | 195-218 | 353-393 | 300 / 247 | 31,995 |
| CDO-8255-3A | 506-572 | 316-358 | 413-463 | 258-289 | 439-464 | 373 / 307 | 35,995 |
| CDO-8255-4 | 506-572 | 316-358 | 413-463 | 258-289 | 439-464 | 373 / 307 | 31,995 |
| CDO-8255-5 | 720-780 | 450-486 | 546-598 | 341-373 | 513-543 | 436 / 359 | 35,995 |
| CDO-8255-6 | 1,000-1,100 | 624-686 | 833-917 | 520-572 | 615-655 | 522 / 430 | 39,430 |
| CDO-8255-7A | 1,250-1,375 | 780-858 | 1,040-1,146 | 649-715 | 773-828 | 657 / 541 | 39,430 |
| CDO-8255-7 | 1,500-1,650 | 936-1,030 | 1,249-1,375 | 779-858 | 928-993 | 788 / 650 | 39,430 |
| CDO-8255-8 | 1,800-1,980 | 1,123-1,236 | 1,499-1,650 | 935-1,030 | 1,105-1,175 | 939 / 774 | 43,430 |
Capacity basis: The catalog reference output is calculated using standard bolts and 26 production days per month. Monthly tonnage also assumes continuous operation. Actual capacity must be recalculated for the real part, loading pattern, steel grade, process temperature, case depth and cycle time.
CDO-8255GAS Gas-Heated Series
| Model | High/Medium-Carbon Steel (kg/h) | Low-Carbon Steel (kg/h) | Mesh Belt Width (mm) | Furnace Inside Height (mm) | Heating Length (mm) | Burner Capacity (kcal/h) | Electric Power (kW) |
|---|---|---|---|---|---|---|---|
| CDO-8255GAS-1 | 506-572 | 413-463 | 800 | 100 | 6,000 | 180,000 | 45 |
| CDO-8255GAS-2 | 720-780 | 546-598 | 800 | 100 | 8,000 | 300,000 | 90 |
| CDO-8255GAS-3 | 1,000-1,100 | 833-917 | 800 | 100 | 10,000 | 450,000 | 90 |
| CDO-8255GAS-4 | 1,800-1,980 | 1,499-1,650 | 1,200 | 100 | 12,000 | 690,000 | 135 |
Engineering note: Final rated temperature, fuel type, gas pressure, electrical supply, atmosphere system, quench tank, belt material and emission treatment are confirmed in the technical agreement.
Suitable Parts and Processes
The CDO-8255 continuous carburizing furnace is intended for stable, high-volume production of components that can be distributed uniformly on a mesh belt.
- Screws and Nuts
- Standard Fasteners
- Bearings
- Chains
- Automotive Parts
- Bicycle Parts
- Mechanical Parts
- Hardware Tools
- Tooling Fixtures
Control and Reliability Features
- PLC automatic control for the complete production line
- Independent zone temperature control and alarm protection
- Controlled mesh-belt speed and residence time
- Methanol-propane atmosphere delivery and pressure control
- Automatic loading, washing, quenching and tempering linkage
- Configurable process recording and recipe management
- Safety interlocks for heating, drive, atmosphere and quench systems
- Service access for cleaning, slag removal and routine maintenance
Energy Recovery and Environmental Treatment
Wash-Tank Waste-Heat Recovery
Heat recovered from the quenching and tempering sections can be used to warm the cleaning liquid. The reference design indicates a cleaning-tank temperature of approximately 50-65°C and a potential reduction of about 24 kW in separate cleaning-water heating under the specified configuration.
Tempering Exhaust Treatment
An exhaust-gas burner at the tempering-furnace inlet can burn oil mist and smoke carried from the quenching process, helping reduce visible exhaust contamination.
Gas-Furnace Heat Exchanger
The gas-heated reference design uses dual ducts and a built-in heat exchanger. The catalog states a heat-exchange rate above 60% for its specified design; the final value depends on operating conditions.
Negative-Pressure Combustion
Combustion air and exhaust routing are engineered so the burner system can operate under controlled negative-pressure conditions, improving combustion stability and plant safety.
Continuous Mesh Belt Furnace Photos
CDO-8255 Mesh Belt Furnace FAQs
Technical answers for fastener, bearing, chain and automotive-part heat treatment projects.
What processes can the CDO-8255 production line perform?
Depending on configuration, it can perform carburizing, carbonitriding, conditioning, hardening, liquid quenching, washing and tempering in one continuous line.
What is the difference between CDO-8255 and CDO-8255GAS?
CDO-8255 uses electric resistance heating. CDO-8255GAS uses industrial gas burners plus a heat exchanger. The best choice depends on energy price, plant utilities, emissions requirements, output and control preferences.
Why are separate capacities listed for different steel grades?
Low-carbon carburizing usually requires a longer heating and diffusion cycle than through-hardening of medium- or high-carbon steel. Longer residence time reduces the hourly output for the same furnace size.
How were the catalog production capacities calculated?
The reference figures use standard bolts and 26 production days per month. They are selection references, not guaranteed output for every part. Actual capacity is recalculated from the workpiece and process.
How is the methanol-propane atmosphere controlled?
The atmosphere system meters methanol and propane according to the process recipe. Furnace pressure, gas flow and carbon potential should be controlled according to steel grade, temperature and required case depth.
Can the line be used for screws, nuts and fasteners?
Yes. It is designed for mass heat treatment of screws, nuts, bolts and other standard fasteners, provided the loading distribution and mesh opening are selected for the part dimensions.
How do I choose mesh belt width and heating length?
Provide the part dimensions, weight, steel grade, loading arrangement, kg/h requirement, process temperature and cycle time. These inputs determine usable belt width, belt speed and heated-zone length.
What quenching system can be supplied?
The line can be engineered with the required liquid-quench system, circulation, cooling, filtration and material handling. Quench medium and agitation are selected from the material and hardness requirement.
Does the line include washing and tempering?
Yes. A complete configuration can include pre-washing, post-quench washing, tempering, cooling and discharge equipment. Individual modules may be adjusted to the customer's process.
How does waste-heat recovery work?
Heat from the quenching and tempering sections can warm cleaning liquid through circulation equipment. Under the reference configuration, the wash tank can reach approximately 50-65°C with reduced separate heating demand.
Can CDO customize the complete production line?
Yes. Heating method, belt width, furnace height, zone length, atmosphere, quench tank, washing system, tempering furnace, controls and line layout can be customized.
What information is required for a technical quotation?
Send part drawings or photos, material grade, dimensions and weight, current and required hardness, case depth, kg/h output, heat-treatment process, atmosphere, quench medium, power supply, available fuel and installation space.
Need a CDO-8255 Line Selection?
Send the workpiece, steel grade, heat-treatment requirement and hourly output for a model and process recommendation.