W Radiant Tubes

What are the main advantages of Radiant Tubes in high-temperature heat treatment furnaces (800-1200°C)?
1. High-temperature and thermal shock resistance
Utilizing a centrifugal casting process, Radiant Tubes boast uniform wall thickness (thickness tolerance ≤0.2mm), maintaining structural integrity in operating environments of 800-1200°C and significantly reducing the risk of cracking caused by thermal stress.
2. High thermal efficiency
The thin-wall design (down to 4.76mm) significantly increases the heat radiation area, improving heat transfer efficiency, enabling rapid furnace temperature increase and stable temperature maintenance, and reducing energy consumption.
3. Excellent mechanical properties
The dense microstructure achieved through centrifugal casting provides the tubes with excellent tensile and compressive strength, enabling them to withstand long-term high-temperature cycles without deformation.
4. Customizability
Depending on the furnace type (carburizing furnace, continuous furnace, industrial furnace), wall thickness, material (alloy steel, corrosion-resistant stainless steel), and tube diameter can be flexibly adjusted to meet specific customer process requirements. Keywords: Radiant Tubes, Wuxi Junteng Fanghu Alloy Casting Co., Ltd.

What are the common symptoms of radiant tube failure (cracks, leaks, decreased thermal efficiency) and quick troubleshooting steps?
1. Cracks

Symptoms: Small cracks or obvious fractures appear on the tube wall, accompanied by abnormally high local temperatures.
Troubleshooting: Use magnetic particle inspection or ultrasonic testing to locate cracks; check for uniform cooling water pressure and eliminate thermal stress caused by local overheating.
2. Leaks

Symptoms: Leakage of the medium (such as heating oil or nitrogen) within the tube, resulting in oil stains or gas leaking sounds.
Troubleshooting: First, perform a water pressure test (all our products undergo this test before shipment) to confirm any leaks; then use helium penetrant testing to locate minor leaks.
3. Decreased Thermal Efficiency

Symptoms: Prolonged furnace heating time, increased energy consumption, and uneven surface temperature. Troubleshooting: Check the tube wall for scaling caused by corrosion or deposits, which could obstruct the radiating surface. Use an infrared thermal imager to quickly locate areas of abnormal temperature. Dismantle the tube interior for inspection and cleaning or replacement if necessary.
4. Quick Troubleshooting Process

Step 1: Visually inspect the exterior and note any abnormalities.
Step 2: Perform a water or air pressure test to confirm leaks.
Step 3: Use NDT (magnetic particle or ultrasonic) to locate cracks or defects.
Step 4: Use an infrared thermal imager or temperature sensor to assess the heat distribution and determine if there are any thermal efficiency issues.
Through this systematic troubleshooting, problems can be located and repairs or replacements implemented as quickly as possible, minimizing downtime losses.

What are the common models and specifications of radiant tubes offered by Wuxi Junteng Fanghu Alloy Casting?
Tube diameters range from 50mm to 1000mm.
Suitable for a full range of heat treatment equipment, from small laboratory furnaces to large industrial furnaces.

Available in lengths up to 5.5m.
The long tube design facilitates one-time installation, reduces on-site splicing, and improves overall sealing and reliability.

Wall thickness range: 4.76mm – 30mm (customizable upon request).
Thin-wall products offer higher thermal radiation efficiency, while thicker-wall products provide stronger mechanical support.

Materials

High-temperature alloy steels (such as 1.2367 and 1.2369)
Stainless steel (304 and 316L)
Special corrosion-resistant alloys (for the chemical and petroleum industries)
Customization Options

U-shaped, W-shaped, and round tube cross-sections are available.
Surface treatments include sandblasting, polishing, and coating (high-temperature ceramic).
Inspection Services: Pre-shipment hydrostatic testing, magnetic particle inspection, and ultrasonic testing are available to meet diverse customer quality requirements.