U-Shaped Radiant Tube Manufacturer | Custom Furnace Radiant Tubes | FH® Alloy

Product Specification

U-Shaped Radiant Tube for Industrial Furnaces
FH® Alloy manufactures U-shaped radiant tubes for industrial furnaces, heat treatment furnaces, and indirect heating systems.

The U-shaped configuration provides a large radiant heating surface within a compact furnace space and is widely used where the combustion process needs to be separated from the furnace atmosphere.

Our U-shaped radiant tubes can be customized according to customer drawings, furnace dimensions, operating temperature, burner configuration, and service conditions.

Product Overview
U-shaped radiant tubes consist of two straight tube sections connected by a curved return section, forming a compact heating circuit.

This configuration is suitable for industrial furnace applications requiring:

• Indirect heating
• Stable heat transfer
• Controlled furnace atmosphere
• Compact installation
• High-temperature operation
• Convenient replacement and maintenance

As shown in the product, the tube assembly can also be supplied with mounting plates, insulation/support blocks, and customized installation structures according to furnace requirements.

Typical Specifications

U-Shaped Radiant Tube Dimensions
The dimensions of each radiant tube can be customized according to the furnace structure and installation requirements.

Typical dimensions include:

• OD – Tube Outside Diameter
• WT – Wall Thickness
• C – Center Distance
• H – Overall Height
• L – Straight Leg Length
• R – Bend Radius
• Mounting plate dimensions
• Connection dimensions
• Insulation block dimensions

Customers can provide a technical drawing, sample, or dimensional sketch for production.
Recommended Drawing Parameters
OD = Tube Outside Diameter
WT = Wall Thickness
C = Center Distance
H = Overall Height
L = Straight Leg Length
R = Bend Radius
Custom dimensions are available upon request.

Material Options
Material selection is one of the most important factors affecting radiant tube service life.
FH® Alloy can manufacture U-shaped radiant tubes from different heat-resistant alloys according to the actual operating conditions.

Typical options include:

• 1.4848
• 1.4849
• 1.4852
• 2.4879
• High-chromium heat-resistant alloys
• High-nickel heat-resistant alloys
• Nickel-based high-temperature alloys
• Other customer-specified grades

Material selection should consider not only furnace temperature, but also:

• Furnace atmosphere
• Burner conditions
• Thermal cycling frequency
• Oxidation conditions
• Required service life
• Tube dimensions and structural design

Designed for Indirect Heating
U-shaped radiant tubes are commonly used in furnace systems where direct flame contact with the workpiece must be avoided.

During operation, the burner heats the inside of the radiant tube. Heat is then transferred through the tube wall and radiated into the furnace chamber.

This design helps provide:

• Uniform furnace heating
• Controlled processing atmosphere
• Reduced direct flame contact
• Stable heat transfer
• Improved temperature consistency

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

• Heat treatment furnaces
• Annealing furnaces
• Hardening furnaces
• Tempering furnaces
• Carburizing furnaces
• Continuous furnaces
• Roller hearth furnaces
• Protective atmosphere furnaces
  Steel processing lines
• Industrial heating equipment

They are particularly suitable for furnace systems requiring indirect gas-fired or radiant heating.

Manufacturing & Fabrication
For U-shaped radiant tubes, the quality of the bend section, welded joints, straight tubes, and mounting structure directly affects dimensional stability and service performance.

Depending on the design, the production process may include:
Material Preparation → Tube Fabrication → Bend/Elbow Preparation → Assembly → Welding → Machining → Dimensional Inspection → Surface Cleaning → Final Inspection

Key manufacturing controls include:

• Tube straightness
• Wall thickness consistency
• Center distance accuracy
• Bend geometry
• Weld quality
• Overall dimensional accuracy
• Mounting alignment

Key Advantages
High-Temperature Performance
Available in different heat-resistant alloys for demanding furnace environments.
Compact U-Shaped Design
The return structure provides a long heating path while reducing installation space.
Custom Dimensions
Tube diameter, wall thickness, center distance, overall height, and bend dimensions can be customized.
Custom Mounting Structure
Base plates, support structures, insulation blocks, and connection arrangements can be produced according to furnace drawings.
Replacement Manufacturing
Existing radiant tubes can be reproduced according to customer drawings, samples, or dimensional measurements.

Quality Inspection
Depending on customer requirements, inspection can include:

• Chemical composition verification
• Dimensional inspection
• Tube wall thickness inspection
• Visual inspection
• Weld inspection
• Mounting dimension inspection
• Surface inspection
• Material verification

Additional testing requirements can be confirmed before production.

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

Our furnace component range includes:

• U-shaped radiant tubes
• Straight radiant tubes
• P-type radiant tubes
• M-type radiant tubes
• Special-shaped bent radiant tubes
• Furnace rollers
• Centrifugal cast tubes
• Heat treatment fixtures
• Furnace trays and baskets

We support OEM production, drawing-based manufacturing, sample replacement, and customized material selection for international customers.

Request a Quote
Looking for a custom U-shaped radiant tube for your furnace?

Please send us:

1. Product drawing or sketch
2. Tube outside diameter
3. Wall thickness
4. Center distance
5. Overall height
6. Bend radius
7. Material grade
8. Operating temperature
9. Furnace atmosphere
10. Required quantity

Send your drawing to FH® Alloy for technical review and quotation.

FAQ
Q1: Can you manufacture U-shaped radiant tubes according to our drawings?
Yes. FH® Alloy supports custom manufacturing according to customer drawings, samples, and furnace dimensions.

Q2: What materials are available?
We can provide 1.4848, 1.4849, 1.4852, 2.4879, high-Cr alloys, high-Ni alloys, nickel-based alloys, and other customer-specified materials.

Q3: Can the center distance and overall height be customized?
Yes. Tube diameter, wall thickness, center distance, overall height, bend radius, and installation dimensions can all be customized.

Q4: Can you manufacture replacement radiant tubes?
Yes. Existing radiant tubes can be reproduced based on drawings, samples, photos, and dimensional information.

Q5: Can the base plate and insulation block structure also be customized?
Yes. Mounting plates, support structures, insulation blocks, and related installation components can be designed according to the customer’s furnace configuration.