HU U-Shaped Radiant Tube – Ø152.4 × Ø142.8 × 2154.24 mm

Custom Large-Diameter Radiant Tube Assembly for Industrial Furnaces | FH® Alloy
FH® Alloy manufactures HU U-shaped radiant tubes for industrial furnaces, heat treatment furnaces, and high-temperature indirect heating systems.

This customized radiant tube is manufactured from HU heat-resistant alloy with a tube specification of Ø152.4 × Ø142.8 × 2154.24 mm (OD × ID × L).

The large-diameter U-shaped structure provides an extended radiant heating surface while maintaining a compact furnace installation arrangement. The product can also be supplied as a complete assembly with high-temperature insulation blocks, mounting base plates, and customized installation components.

FH® Alloy supports OEM manufacturing according to customer drawings, furnace dimensions, operating conditions, and replacement requirements.

Product Specifications

U-Shaped Radiant Tube Dimensions
The main specification of this radiant tube is:
Ø152.4 × Ø142.8 × 2154.24 mm

• OD – Outside Diameter: Ø152.4 mm
  
• ID – Inside Diameter: Ø142.8 mm
  
• Nominal Wall Thickness: 4.8 mm
  
• L – Length: 2154.24 mm
  

Other structural dimensions can be customized, including:

• C – Center Distance
  
• H – Overall Height
  
• R – U-Bend Radius
  
• Straight leg length
  
• Mounting plate dimensions
  
• Mounting hole positions
  
• Insulation block dimensions
  
• Inlet / outlet connection dimensions
  

All dimensions can be manufactured according to customer drawings or existing furnace dimensions.

HU Heat-Resistant Alloy
HU is a high-chromium, high-nickel heat-resistant cast alloy grade commonly used for components operating in elevated-temperature industrial environments.

For radiant tube applications, HU material provides characteristics such as:

• Good high-temperature strength
  
• Good oxidation resistance
  
• Stable performance during prolonged thermal exposure
  
• Suitable resistance to repeated heating and cooling cycles
  
• Good structural stability for industrial furnace applications
  

The actual service performance of a radiant tube depends on more than material grade alone. Operating temperature, furnace atmosphere, burner conditions, thermal cycling, tube geometry, and furnace operating practices should also be considered.

Large-Diameter U-Shaped Structure
With an outside diameter of Ø152.4 mm, this product is designed as a relatively large U-shaped radiant tube for industrial furnace systems requiring a substantial radiant heating surface.
The structure consists of two long parallel tube sections connected by a U-bend.

This configuration provides:

• Extended radiant heating path
  
• Large heating surface
  
• Compact furnace arrangement
  
• Stable indirect heating
  
• Flexible center-distance design
  
• Adaptability to different furnace layouts
  

Compared with a simple straight radiant tube, the U-shaped design allows a longer heat-transfer path within limited installation space.

Complete Insulation & Mounting Assembly
As shown in this product configuration, the radiant tube can be supplied together with high-temperature insulation blocks and a metal mounting base plate.
This complete assembly helps simplify installation and replacement.

Customized components can include:

• Insulation block thickness
  
• Insulation block dimensions
  
• Base plate size
  
• Base plate thickness
  
• Mounting hole quantity
  
• Mounting hole positions
  
• Tube spacing
  
• Supporting structure
  

For furnace builders and replacement projects, FH® Alloy can provide the complete assembly instead of only supplying the bare radiant tube.

Indirect Furnace Heating
U-shaped radiant tubes are widely used in industrial furnaces where the heating source or combustion gases should remain separated from the furnace working chamber.
Heat generated inside the tube is transferred through the tube wall and radiated toward the furnace load.

This heating arrangement can help provide:

• Controlled furnace atmosphere
  
• Reduced direct flame contact
  
• Stable heat distribution
  
• More uniform furnace temperature
  
• Reliable continuous heating performance
  

Typical Applications
HU U-shaped radiant tubes can be 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
  

This specification is particularly suitable for systems requiring large-diameter, long U-shaped radiant tubes for high-temperature indirect heating.

Manufacturing Process
Depending on the technical drawing, the manufacturing process can include:
Material Preparation → Tube Production → U-Bend / Elbow Fabrication → Assembly → Welding → Machining → Mounting Plate Fabrication → Insulation Assembly → Dimensional Inspection → Final Inspection

Key manufacturing controls include:

• Outside and inside diameter
  
• Wall thickness
  
• Tube straightness
  
• Center distance
  
• Bend geometry
  
• Welding quality
  
• Overall dimensions
  
• Mounting plate alignment
  
• Insulation assembly fit
  

Accurate dimensional control is particularly important for a 2154.24 mm long radiant tube, because installation alignment directly affects furnace assembly and service performance.

Key Product Advantages
HU Heat-Resistant Alloy
Designed for demanding industrial furnace environments.
Large Ø152.4 mm Diameter
Provides a substantial radiant heating surface.
2154.24 mm Tube Length
Suitable for large industrial furnace installations.
4.8 mm Nominal Wall Thickness
Calculated from the specified Ø152.4 mm OD and Ø142.8 mm ID.
Complete Assembly Supply
Available with insulation blocks, base plates, and mounting components.
Custom Engineering
Center distance, bend radius, mounting structure, and other dimensions can be customized.
Replacement Manufacturing
Existing radiant tube assemblies can be reproduced according to drawings, samples, or measured dimensions.

Quality Control
Depending on project requirements, inspection can include:

• Material verification
  
• Chemical composition inspection
  
• Outside diameter inspection
  
• Inside diameter inspection
  
• Wall thickness measurement
  
• Overall length inspection
  
• Center-distance inspection
  
• Bend geometry inspection
  
• Weld inspection
  
• Mounting plate inspection
  
• Final assembly inspection
  

Additional inspection requirements can be agreed before production.

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

Our radiant tube range includes:

• HU U-Shaped Radiant Tubes
  
• Cr25Ni35 U-Shaped Radiant Tubes
  
• P-Type Radiant Tubes
  
• I-Type Radiant Tubes
  
• Straight Radiant Tubes
  
• Gas-Fired Radiant Tubes
  
• Special-Shaped Radiant Tubes
  
• Custom Radiant Tube Assemblies
  

We also manufacture furnace rollers, centrifugal cast tubes, heat treatment fixtures, furnace trays, furnace baskets, and other custom furnace components.

Request a Quote
For an accurate quotation, please provide:

1. Technical drawing
   
2. Material grade
   
3. Outside diameter
   
4. Inside diameter or wall thickness
   
5. Overall length
   
6. Center distance
   
7. U-bend radius
   
8. Mounting plate dimensions
   
9. Operating temperature
   
10. Furnace atmosphere
    
11. Required quantity
    

Send your drawing or existing radiant tube specifications to FH® Alloy for technical review and quotation.

FAQ
Q1: Can you manufacture Ø152.4 × Ø142.8 × 2154.24 mm U-shaped radiant tubes?
Yes. FH® Alloy can manufacture this HU radiant tube specification and can also adjust the dimensions according to your furnace design.

Q2: What is the wall thickness?
Based on an outside diameter of Ø152.4 mm and an inside diameter of Ø142.8 mm, the nominal radial wall thickness is 4.8 mm.

Q3: Can the center distance be customized?
Yes. Center distance, bend radius, straight leg length, overall height, and installation dimensions can all be customized.

Q4: Can you supply the insulation blocks and mounting base?
Yes. The radiant tube can be supplied as a complete assembly with customized insulation blocks, mounting plates, and related installation components.

Q5: Can HU be replaced with another heat-resistant alloy?
Yes. Material can be selected according to operating temperature, furnace atmosphere, thermal cycling conditions, and expected service life.

Q6: Can you manufacture replacement radiant tubes?
Yes. Existing radiant tubes can be reproduced from technical drawings, samples, photographs, or measured dimensions.