Straight Radiant Tube with Round Flange Manufacturer | FH® Alloy

Product Specification

Straight Radiant Tube with Round Flange for Industrial Furnaces
Custom Heat-Resistant Radiant Tube Assembly | Drawing-Based Manufacturing | FH® Alloy
FH® Alloy manufactures straight radiant tubes with custom round flange connections for industrial furnaces, heat treatment equipment, and indirect heating systems.

This type of radiant tube features a long straight tube body combined with a machined circular flange, end connection, and supporting structure, making it suitable for furnace systems that require accurate installation, reliable sealing, and convenient maintenance.

All dimensions, materials, flange configurations, and support structures can be customized according to customer drawings and actual furnace operating conditions.

Product Overview
The straight radiant tube is designed for industrial furnace applications where the heating source needs to be separated from the furnace working chamber.

Compared with bent radiant tube designs, the straight structure offers:

• Simple furnace installation
• Easy inspection and replacement
• Stable tube alignment
• Flexible flange connection
• Convenient burner or exhaust connection
• Custom support structure

FH® Alloy supports OEM and replacement manufacturing based on customer drawings, samples, or measured dimensions.

Typical Specifications

Straight Radiant Tube Dimensions
The dimensions of straight radiant tubes can be customized according to the furnace layout, burner connection, mounting structure, and installation space.

Typical dimensional parameters include:

• OD – Tube Outside Diameter
• WT – Wall Thickness
• L – Overall Length
• FD – Flange Outside Diameter
• FT – Flange Thickness
• PCD – Pitch Circle Diameter
• HD – Mounting Hole Diameter
• Connection Diameter
• Support Position
• End Connection Length

Drawing Reference
OD = Outside Diameter
WT = Wall Thickness
L = Overall Length
FD = Flange Diameter
FT = Flange Thickness
PCD = Pitch Circle Diameter
All dimensions can be customized according to customer drawings.

Material Options
Radiant tube material should be selected according to actual operating conditions rather than furnace temperature alone.

FH® Alloy can manufacture straight radiant tubes using different heat-resistant alloys, including:

• 1.4848
• 1.4849
• 1.4852
• 2.4879
• Heat-resistant stainless steels
• High-Cr alloys
• High-Ni heat-resistant alloys
• Nickel-based high-temperature alloys
• Customer-specified alloy grades

Important selection factors include:

• Operating temperature
• Furnace atmosphere
• Burner type
• Thermal cycling frequency
• Oxidation conditions
• Tube wall thickness
• Required service life

If the material has not yet been determined, customers can provide their furnace conditions for material selection support.

Round Flange & Support Structure
One of the main features of this product is the machined round flange connection.

Depending on furnace design, the flange can be customized for:

• Flange outside diameter
• Flange thickness
• Bolt hole quantity
• Bolt hole diameter
• Pitch circle diameter
• Connection opening
• Sealing surface
• Installation orientation

The support or reinforcing structure around the tube end can also be customized to help improve installation stability.
For replacement projects, FH® Alloy can manufacture the flange and support geometry according to the original product drawing or sample.

Indirect Heating Applications
Straight radiant tubes are commonly used in industrial furnace systems where direct flame contact with the processed parts should be avoided.

During operation, heat is transferred through the radiant tube wall and then radiated into the furnace chamber.

This arrangement can help provide:

• Stable heat transfer
• More uniform furnace temperature
• Controlled furnace atmosphere
• Reduced direct flame contact
• Reliable continuous heating
• Easier burner and tube maintenance

Typical Applications
Straight 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 especially suitable for furnace systems requiring straight tube installation with flange-mounted connections.

Manufacturing Process
Depending on the product design, manufacturing may include:
Material Preparation → Tube Forming / Casting → End Component Fabrication → Flange Machining → Welding → Support Assembly → Dimensional Inspection → Surface Cleaning → Final Inspection

Key manufacturing controls include:

• Tube straightness
• Wall thickness consistency
• Flange concentricity
• Bolt hole position
• Weld quality
• Support alignment
• Overall dimensional accuracy
• End connection fit

These factors are important for installation accuracy and long-term furnace operation.

Key Advantages
Custom Round Flange Design
Flange diameter, thickness, bolt holes, and mounting details can be manufactured according to the customer’s furnace.
Straight Tube Structure
Suitable for furnace systems requiring simple, stable, and easy-to-maintain radiant tube installation.
Multiple Heat-Resistant Alloy Options
Material can be selected according to actual furnace temperature and atmosphere.
Custom Support Assembly
End supports and reinforcing structures can be fabricated according to installation requirements.
Replacement Manufacturing
Existing radiant tubes can be reproduced according to drawings, samples, photos, and dimensional measurements.
OEM Production
Suitable for furnace manufacturers, heat treatment plants, and industrial equipment companies.

Quality Control
Depending on customer requirements, inspection can include:

• Material verification
• Chemical composition analysis
• Dimensional inspection
• Wall thickness measurement
• Flange dimension inspection
• Bolt hole position inspection
• Weld inspection
• Visual inspection
• Assembly inspection
• Surface inspection

Additional testing requirements can be agreed before production.

Why Choose FH® Alloy?
FH® Alloy specializes in custom furnace components and heat-resistant alloy products for industrial heating and heat treatment applications.

Our radiant tube range includes:

• Straight Radiant Tubes
• U-Shaped Radiant Tubes
• I-Shaped Radiant Tubes
• P-Type Radiant Tubes
• M-Type Radiant Tubes
• Gas-Fired Radiant Tubes
• Special-Shaped Bent Radiant Tubes
• Custom Furnace Tubes

We also manufacture:

• Furnace rollers
• Centrifugal cast tubes
• Heat treatment fixtures
• Furnace trays
• Furnace baskets
• Other custom heat-resistant furnace components

Request a Quote
Need a custom straight radiant tube with round flange for your furnace?

Please send us:

1. Product drawing or sketch
2. Tube outside diameter
3. Wall thickness
4. Overall length
5. Flange outside diameter
6. Flange thickness
7. Bolt hole quantity and PCD
8. Material grade
9. Operating temperature
10. Furnace atmosphere
11. Required quantity

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

FAQ
Q1: Can you manufacture straight radiant tubes according to our drawings?
Yes. FH® Alloy supports custom production according to customer drawings, samples, and dimensional information.

Q2: Can the round flange be customized?
Yes. Flange diameter, thickness, PCD, bolt hole quantity, hole diameter, and connection dimensions can all be customized.

Q3: Can you manufacture the support structure shown at the tube end?
Yes. End supports, brackets, reinforcing structures, and other mounting components can be manufactured according to the customer’s design.

Q4: What materials are available?
Material options can include 1.4848, 1.4849, 1.4852, 2.4879, heat-resistant stainless steels, high-Ni alloys, and other high-temperature alloy grades.

Q5: Can you manufacture replacement tubes for existing furnaces?
Yes. Customers can provide original drawings, samples, product photos, or measured dimensions for replacement manufacturing.

Q6: How do we select the correct material?
Please provide the operating temperature, furnace atmosphere, burner conditions, and expected service life. FH® Alloy can recommend a suitable material accordingly.