Cr25Ni35 U-Shaped Radiant Tube – Ø124 × Ø108 × 1597 mm

Custom Heat-Resistant Radiant Tube Assembly for Industrial Furnaces | FH® Alloy
FH® Alloy manufactures Cr25Ni35 U-shaped radiant tubes for industrial furnaces, heat treatment furnaces, and other high-temperature heating systems.

This customized U-type radiant tube is manufactured from Cr25Ni35 high-chromium, high-nickel heat-resistant alloy, with a tube specification of Ø124 × Ø108 × 1597 mm.

The complete assembly can be supplied with insulation blocks, mounting base plates, and customized installation components, making it suitable for new furnace construction as well as replacement of existing radiant tube assemblies.

Product Specifications

U-Shaped Radiant Tube Dimensions
The main tube specification for this product is:
Ø124 × Ø108 × 1597 mm
Typical dimensions that can be customized include:

• OD – Tube Outside Diameter
  
• ID – Tube Inside Diameter
  
• L – Tube Length
  
• C – Center Distance
  
• H – Overall Height
  
• R – U-Bend Radius
  
• Mounting plate dimensions
  
• Mounting hole positions
  
• Insulation block dimensions
  
• Connection dimensions
  

All structural dimensions can be manufactured according to the customer's technical drawing, furnace layout, or existing sample.

Cr25Ni35 Heat-Resistant Alloy
Cr25Ni35 is a high-Cr, high-Ni heat-resistant alloy suitable for industrial furnace components exposed to prolonged high-temperature service.

For radiant tube applications, its main advantages include:

• Good high-temperature oxidation resistance
  
• Good structural stability at elevated temperatures
  
• Suitable strength for furnace service
  
• Resistance to repeated heating and cooling cycles
  
• Suitable for demanding industrial heating environments
  

The actual service life of the radiant tube depends not only on the alloy grade, but also on:

• Operating temperature
  
• Furnace atmosphere
  
• Burner conditions
  
• Thermal cycling frequency
  
• Tube dimensions
  
• Welding quality
  Furnace operating practice
  

U-Type Radiant Heating Structure
The U-shaped radiant tube consists of two parallel straight tube sections connected by a return bend.
Compared with a simple straight tube, this design provides a longer radiant heating path while maintaining a relatively compact installation footprint.

Key benefits include:

• Larger radiant heating surface
  
• Compact furnace installation
  
• Stable indirect heating
  
• Controlled furnace atmosphere
  
• Reduced direct flame contact with the load
  
• Flexible center-distance customization
  

This makes U-shaped radiant tubes suitable for many industrial heat treatment and continuous furnace systems.

Insulation Block & Mounting Base Assembly
A key feature of this product is the integrated insulation block and mounting base structure.
The radiant tube can be supplied together with:

• High-temperature insulation blocks
  
• Metal mounting base plate
  
• Mounting holes
  
• Support components
  
• Customized fixing structure
  

This complete assembly helps simplify furnace installation and replacement.
The insulation and mounting structure can be customized according to the customer's furnace opening and installation dimensions.

Designed for Indirect Furnace Heating
U-shaped radiant tubes are commonly used in furnace systems where the combustion process should remain separated from the furnace working chamber.
Heat is transferred through the radiant tube wall and radiated toward the furnace load.

This heating arrangement helps provide:

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

Typical Applications
Cr25Ni35 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
  

They are particularly suitable for applications requiring custom high-temperature indirect heating systems.

Manufacturing Process
Depending on the drawing and product structure, production may include:
Material Preparation → Tube Production → Bend / Elbow Fabrication → Assembly → Welding → Mounting Plate Fabrication → Insulation Assembly → Dimensional Inspection → Final Inspection

Key production controls include:

• Tube diameter accuracy
  
• Tube straightness
  
• Center-distance accuracy
  
• U-bend geometry
  
• Weld quality
  
• Overall dimensions
  
• Mounting plate alignment
  
• Insulation block fit
  

These factors directly affect installation accuracy and long-term service performance.

Key Product Advantages
Cr25Ni35 Heat-Resistant Material
Suitable for demanding industrial furnace environments.
Custom Ø124 × Ø108 × 1597 mm Specification
Manufactured according to specific furnace installation requirements.
Compact U-Shaped Structure
Provides an extended heating path without requiring excessive furnace space.
Complete Assembly Supply
Radiant tube, insulation blocks, and mounting base can be supplied together.
Drawing-Based Manufacturing
Dimensions and structural details can be customized according to customer drawings.
Replacement Capability
Existing radiant tubes can be reproduced according to samples, drawings, or measured dimensions.

Quality Control
Depending on project requirements, inspection can include:

• Material verification
  
• Chemical composition inspection
  
• Outside / inside diameter inspection
  
• Dimensional inspection
  
• Center-distance inspection
  
• Weld inspection
  
• Bend geometry inspection
  
• Mounting plate inspection
  
• Final assembly inspection
  

Special inspection requirements can be confirmed before production.

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

Our radiant tube range includes:

• Cr25Ni35 U-Shaped Radiant Tubes
  
• HU 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, trays, baskets, and other furnace components.

Request a Quote
For an accurate quotation, please send us:

• Technical drawing
  
• Material grade
  
• Outside diameter
  
• Inside diameter or wall thickness
  
• Overall length
  
• Center distance
  
• U-bend radius
  
• Mounting plate dimensions
  
• Operating temperature
  
• Furnace atmosphere
  
• Required quantity
  

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

FAQ
Q1: Can you manufacture Cr25Ni35 U-shaped radiant tubes according to our drawing?
Yes. FH® Alloy supports fully customized production based on customer drawings, furnace dimensions, and existing samples.

Q2: Can the Ø124 × Ø108 × 1597 mm dimensions be changed?
Yes. Tube diameter, length, center distance, bend radius, and overall dimensions can all be customized.

Q3: Can you supply the insulation blocks and mounting plate together?
Yes. The U-shaped radiant tube can be supplied as a complete assembly with insulation blocks, mounting plates, and related installation components.

Q4: Can this product be used as a replacement radiant tube?
Yes. We can reproduce existing radiant tubes according to drawings, samples, photographs, or measured dimensions.

Q5: Can another alloy be used instead of Cr25Ni35?
Yes. Material can be selected according to the actual operating temperature, furnace atmosphere, burner conditions, and expected service life.

Q6: What information is needed for quotation?
A technical drawing is preferred. Please also provide the material, dimensions, operating temperature, furnace atmosphere, and quantity.