U Radiant Tubes for Heat Treatment Furnace Korean Market | FH®

U-Shaped Radiant Tube for Industrial Furnaces
FH® Alloy U-Shaped Radiant Tubes are designed for indirect heating applications in industrial heat treatment furnaces. The U-shaped structure provides a large heat transfer surface while keeping the combustion atmosphere separated from the furnace chamber, helping achieve stable and uniform furnace heating.

Manufactured from high-temperature resistant alloys, our radiant tubes can be customized according to operating temperature, furnace atmosphere, tube dimensions, burner design and service conditions.

Key Features

• High resistance to oxidation and high-temperature corrosion
  
• Good strength and dimensional stability at elevated temperatures
  
• Designed for efficient and uniform radiant heat transfer
  
• Suitable for continuous and batch-type industrial furnaces
  
• Custom tube diameter, wall thickness, length and U-bend dimensions
• Available in various heat-resistant stainless steels and nickel-based alloys
  
• Fabrication according to customer drawings or existing furnace dimensions
  
• Inspection available before shipment
  

Typical Specifications

Typical Applications
U-shaped radiant tubes are widely used in:

• Heat treatment furnaces
  
• Carburizing furnaces
  
• Annealing furnaces
  
• Hardening furnaces
  
• Continuous furnaces
  
• Roller hearth furnaces
  
• Batch furnaces
  
• Industrial heating furnaces
  
• Steel processing lines
  
• Metal heat treatment equipment
  

They are particularly suitable for furnace systems requiring indirect heating and controlled furnace atmospheres.

Heat-Resistant Alloy Material Options
Material selection is critical to radiant tube service life.

Depending on furnace temperature, atmosphere and thermal cycling conditions, FH® Alloy can manufacture radiant tubes from different heat-resistant alloy grades, including:

• 1.4848 / AISI 309-type heat-resistant alloys
  
• 1.4849 / AISI 310-type heat-resistant alloys
  
• 1.4852 heat-resistant alloys
  
• 2.4879 high-temperature alloy grades
  
• High-Ni and high-Cr heat-resistant alloys
  
• Nickel-based alloys for more demanding furnace conditions
  

The final material should be selected according to the actual operating temperature, furnace atmosphere, load and expected service life.

Material Selection Table

Manufacturing & Fabrication
Depending on the design, U-shaped radiant tubes can be manufactured using a combination of:
Centrifugal casting / static casting → machining → tube assembly → U-bend fabrication → welding → dimensional inspection → surface finishing → final inspection

For large or high-temperature radiant tubes, special attention is given to:

• Tube straightness
  
• Wall thickness consistency
  
• Weld quality
  
• U-bend geometry
  
• Overall dimensions
  
• High-temperature deformation resistance
  

This helps reduce premature failure caused by thermal stress, oxidation and dimensional distortion.

Designed for High-Temperature Furnace Service
Radiant tubes operate under repeated heating and cooling cycles. Common failure mechanisms include:

• High-temperature oxidation
  
• Thermal fatigue
  
• Creep deformation
  
• Tube bending
  
• Weld cracking
  
• Local overheating
  
• High-temperature corrosion
  

FH® Alloy therefore evaluates the radiant tube design according to the customer's actual furnace conditions instead of selecting material based only on nominal temperature.
For more accurate material selection, we recommend providing:
Operating temperature + furnace atmosphere + tube drawing + burner type + expected service life.

Custom U-Shaped Radiant Tubes
We manufacture U-shaped radiant tubes according to customer drawings and furnace requirements.
Custom parameters include:

• Outside diameter
  
• Inside diameter
  
• Wall thickness
  
• Straight tube length
  
• U-bend radius
  
• Overall height
  
• Connection dimensions
  
• Flange dimensions
  
• Burner interface
  
• Material grade
  
• Welding requirements
  

Existing radiant tubes can also be manufactured according to samples, drawings or dimensional measurements.

Quality Inspection
Depending on project requirements, inspection may include:

• Chemical composition analysis
  
• Dimensional inspection
  
• Visual inspection
  
• Weld inspection
  
• Mechanical property testing
  
• Surface inspection
  
• Heat-resistant alloy material verification
  

Additional inspection requirements can be discussed before production.

Why Choose FH® Alloy?
FH® Alloy specializes in customized heat-resistant alloy components for industrial furnaces and heat treatment equipment.
Our manufacturing capabilities cover:

• Radiant tubes
  
• Furnace rollers
  
• Heat treatment fixtures
  
• Furnace baskets
  
• Furnace trays
  
• Furnace fan components
  
• Centrifugal cast tubes
  
• Heat-resistant alloy castings
  

We support OEM and drawing-based production for furnace manufacturers, heat treatment plants, steel mills and industrial equipment companies worldwide.

Request a Quote
For an accurate quotation for your U-Shaped Radiant Tube, please send us:

1. Product drawing
   
2. Tube diameter and wall thickness
   
3. Overall dimensions
   
4. Material grade
   
5. Operating temperature
   
6. Furnace atmosphere
   
7. Required quantity
   
8. Photos of the existing radiant tube, if available
   

Send us your drawing or furnace requirements for material selection and quotation.