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Extend Furnace Life with High-Performance Radiant Tubes | FH®

Brand: FH®

Certification: ISO9001, ISO14001

Material: Heat-resistant Steel

Material Grade: 1.4852 (HPCb)

Size: Standard Size or Customized According to Drawings

Structure Type: U-shaped

Operating Temperature: 1150℃

MOQ: 2 Pieces

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FH® Radiant Tubes – High-Performance Furnace Components

Product Overview
The FH® Radiant Tube is a high-quality, durable component designed for industrial furnaces and heat treatment systems. Engineered for maximum thermal efficiency, long service life, and reliable operation, FH® radiant tubes are ideal for natural gas, hydrogen, or other industrial gas-fired furnaces used in automotive, aerospace, steel, and metallurgy industries.

Manufactured from premium high-temperature alloys and cobalt-based superalloys, FH® radiant tubes offer excellent resistance to oxidation, carburization, and thermal fatigue, making them suitable for continuous high-temperature operations.

Key Features

  • Exceptional High-Temperature Performance
    FH® radiant tubes are engineered to withstand continuous furnace temperatures up to 1200°C, maintaining structural integrity under harsh conditions.
  • Superior Oxidation & Carburization Resistance
    Constructed from premium heat-resistant alloys to resist scaling, oxidation, and carburization for extended operational life.
  • Efficient Heat Transfer
    Optimized design ensures uniform heat distribution, improving furnace efficiency and reducing energy consumption.
  • Durable & Reliable Construction
    Heavy-duty materials and precision manufacturing provide long-term durability, even under repeated thermal cycles.
  • Customizable Solutions
    Available in various lengths, diameters, wall thicknesses, and materials to match different furnace types and industrial applications.


Applications
FH® Radiant Tubes are widely used in:

  • Gas-fired industrial furnaces
  • Annealing, carburizing, and tempering lines
  • Continuous and batch furnace systems
  • Automotive and aerospace component heat treatment
  • Steel and alloy processing
  • Precision engineering and metallurgy industries

Why Choose FH® Radiant Tubes?

  • High Thermal Efficiency
    Optimized tube design ensures efficient heat transfer and energy savings.
  • Long Service Life
    Superior resistance to oxidation, carburization, and thermal fatigue reduces maintenance and replacement frequency.
  • Reliable Furnace Performance
    Maintains consistent thermal performance for uniform heat treatment results.
  • Custom Engineering Support
    FH® provides fully customizable tubes to match furnace dimensions, fuel type, and production requirements.
  • Trusted by Global Industrial Manufacturers
    FH® radiant tubes are used by leading heat treatment and manufacturing facilities across Europe and North America.

Material Grade Table

Heat-resistant Steel
/ GB DIN ASTM JIS Chemical Composition (%) Maximum Operation Temperature
C Si Mn Cr Ni Nb/Cb Mo Other
1 ZG40Cr27Ni4 1.4823 HD SCH11 0.30 - 0.50 ≤2.00 ≤1.00 24.00 - 28.00 4.00 - 6.00 - ≤0.50 - 1050℃
2 ZG40Cr22Ni10 1.4826 HF SCH12 0.30 - 0.50 1.00 - 2.50 ≤2.00 19.00 - 23.00 8.00 - 12.00 - ≤0.50 - 950℃
3 ZG30Cr28Ni10 - HE SCH17 0.20 - 0.50 ≤2.00 ≤2.00 26.00 - 30.00 8.00 - 11.00 - - - 1050℃
4 ZG40Cr25Ni12 1.4837 HH SCH13 0.30 - 0.50 1.00 - 2.50 ≤2.00 24.00 - 27.00 11.00 - 14.00 - ≤0.50 - 1050℃
5 ZG30Cr28Ni16 - HI SCH18 0.20 - 0.50 ≤2.00 ≤2.00 26.00 - 30.00 14.00 - 18.00 - - - 1100℃
6 ZG40Cr25Ni20Si2 1.4848 HK SCH21 0.30 - 0.50 ≤1.75 ≤1.50 23.00 - 27.00 19.00 - 22.00 - ≤0.50 - 1100℃
7 ZG30Cr20Ni25 - HN SCH19 0.20 - 0.50 ≤2.00 ≤2.00 19.00 - 23.00 23.00 - 27.00 - - - 1100℃
8 ZG40Cr19Ni39 1.4865 HU SCH20 0.35 - 0.75 ≤2.50 ≤2.00 17.00 - 21.00 37.00 - 41.00 - - - 1020℃
9 ZG40Cr15Ni35 1.4806 HT SCH15 0.35 - 0.70 ≤2.00 ≤2.00 15.00 - 19.00 33.00 - 37.00 - ≤0.50 - 1000℃
10 ZG40Cr25Ni35Nb 1.4852 HPCb SCH24Nb 0.30 - 0.50 ≤2.00 ≤2.00 24.00 - 28.00 33.00 - 37.00 0.80 - 1.80 ≤0.50 - 1100℃
11 ZG40Cr19Ni39Nb 1.4849 - - 0.30 - 0.50 1.00 - 2.50 ≤2.00 18.00 - 21.00 36.00 - 39.00 1.20- 1.80 ≤0.50 - 1100℃
12 ZG40Cr24Ni24Nb 1.4855 - - 0.30 - 0.50 1.00 - 2.50 ≤2.00 23.00 - 25.00 23.00 - 25.00 0.80 - 1.80 ≤0.50 - 1050℃
13 ZG40Cr25Ni35 1.4857 HP SCH24 0.35 - 0.50 1.00 - 2.50 ≤2.00 24.00 - 28.00 33.00 - 37.00 - ≤0.50 - 1100℃
14 ZG1Cr20Ni32Nb 1.4859 - - 0.06 - 0.15 0.50 - 1.50 ≤2.00 19.00 - 21.00 31.00 - 33.00 0.50 - 1.50 ≤0.50 - 1050℃
15 ZG45Cr12Ni60 - HW - 0.35 - 0.75 ≤2.00 ≤2.00 10.00 - 14.00 58.00 - 62.00 - - - 1100℃
16 ZG45Cr18Ni66 - HX - 0.35 - 0.75 ≤2.00 ≤2.00 15.00 - 19.00 64.00 - 68.00 - - - 1100℃
17 ZG1Cr28Co50 2.4778 - - 0.05 - 0.25 0.50 - 1.00 ≤1.50 27.00 - 30.00 ≤1.00 ≤0.50 ≤0.50 Co:48.0 - 52.0 1200℃
18 ZG30Cr28Co50Nb 2.4779 - - 0.25 - 0.35 0.50 - 1.50 0.50 - 1.50 27.00 - 29.00 - 1.50 - 2.50 ≤0.50 Co:48.0 - 52.0 1200℃
19 ZG40Cr28Ni48W5 2.4879 - SCH42 0.35 - 0.55 1.00 - 2.00 ≤1.50 27.00 - 30.00 47.00 - 50.00 - ≤0.50 W:4.0 - 5.5 1200℃


Genuine Photos of FH® Radiant Tubes

FAQ

Q: What furnace types are FH® radiant tubes suitable for?
A: FH® radiant tubes are widely used in gas-fired, continuous, batch, annealing, and heat treatment furnaces.

Q: What materials are available for FH® radiant tubes?
A: We offer heat-resistant alloy steel and HR25 cobalt-based superalloy options for different furnace environments and temperatures.

Q:  What is the maximum operating temperature?
A: FH® radiant tubes can typically operate continuously at temperatures up to 1200°C.

Q: Can FH® manufacture custom radiant tubes?
A: Yes. We provide customized diameters, lengths, wall thicknesses, and tube designs based on your furnace specifications.

Q: What are the advantages of FH® radiant tubes?
A: FH® radiant tubes offer excellent heat transfer efficiency, oxidation resistance, long service life, and reliable high-temperature performance.

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ABOUT US
Quality is Our Core Competitiveness
Wuxi Junteng Fanghu Alloy Technology Co., Ltd.
Since 2006, we have been dedicated to designing and manufacturing alloy steel components. We are OEM Extend Furnace Life with High-Performance Radiant Tubes | FH® Suppliers and Extend Furnace Life with High-Performance Radiant Tubes | FH® Factory.
Our primary products include heat treatment fixtures, radiant tubes, furnace rollers, fan blades, furnace rails, wheels, and various other alloy parts for furnaces. We offer technical assistance to customize or optimize your heat treatment fixtures, helping our customers discover cost-effective solutions to enhance the efficiency of their heat treatment operations.
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Radiant Tubes Industry knowledge

What are the main advantages of Radiant Tubes for Industrial Furnaces | FH® in high-temperature heat treatment furnaces (800-1200°C)?

1. High-temperature and thermal shock resistance

Utilizing a centrifugal casting process, Radiant Tubes for Industrial Furnaces | FH® boast uniform wall thickness (thickness tolerance ≤0.2mm), maintaining structural integrity in operating environments of 800-1200°C and

significantly reducing the risk of cracking caused by thermal stress.

2. High thermal efficiency

The thin-wall design (down to 4.76mm) significantly increases the heat radiation area, improving heat transfer efficiency, enabling rapid furnace temperature increase and stable temperature maintenance, and reducing energy consumption.

3. Excellent mechanical properties

The dense microstructure achieved through centrifugal casting provides the tubes with excellent tensile and compressive strength, enabling them to withstand long-term high-temperature cycles without deformation.

4. Customizability

Depending on the furnace type (carburizing furnace, continuous furnace, industrial furnace), wall thickness, material (alloy steel, corrosion-resistant stainless steel), and tube diameter can be flexibly adjusted to meet specific customer

process requirements. Keywords: Radiant Tubes for Industrial Furnaces | FH®, Wuxi Junteng Fanghu Alloy Technology Co., Ltd.

What are the common symptoms of radiant tube failure (cracks, leaks, decreased thermal efficiency) and quick troubleshooting steps?

1. Cracks

Symptoms: Small cracks or obvious fractures appear on the tube wall, accompanied by abnormally high local temperatures.

Troubleshooting: Use magnetic particle inspection or ultrasonic testing to locate cracks; check for uniform cooling water pressure and eliminate thermal stress caused by local overheating.

2. Leaks

Symptoms: Leakage of the medium (such as heating oil or nitrogen) within the tube, resulting in oil stains or gas leaking sounds.

Troubleshooting: First, perform a water pressure test (all our products undergo this test before shipment) to confirm any leaks; then use helium penetrant testing to locate minor leaks.

3. Decreased Thermal Efficiency

Symptoms: Prolonged furnace heating time, increased energy consumption, and uneven surface temperature. Troubleshooting: Check the tube wall for scaling caused by corrosion or deposits, which could obstruct the radiating

surface. Use an infrared thermal imager to quickly locate areas of abnormal temperature. Dismantle the tube interior for inspection and cleaning or replacement if necessary.

4. Quick Troubleshooting Process

Step 1: Visually inspect the exterior and note any abnormalities.

Step 2: Perform a water or air pressure test to confirm leaks.

Step 3: Use NDT (magnetic particle or ultrasonic) to locate cracks or defects.

Step 4: Use an infrared thermal imager or temperature sensor to assess the heat distribution and determine if there are any thermal efficiency issues.

Through this systematic troubleshooting, problems can be located and repairs or replacements implemented as quickly as possible, minimizing downtime losses.

What are the common models and specifications of Radiant Tubes for Industrial Furnaces | FH® offered by Wuxi Junteng Fanghu Alloy Technology Co., Ltd.?

Tube diameters range from 50mm to 1000mm.

Suitable for a full range of heat treatment equipment, from small laboratory furnaces to large industrial furnaces.

Available in lengths up to 5.5m.

The long tube design facilitates one-time installation, reduces on-site splicing, and improves overall sealing and reliability.

Wall thickness range: 4.76mm – 30mm (customizable upon request).

Thin-wall products offer higher thermal radiation efficiency, while thicker-wall products provide stronger mechanical support.

Materials

High-temperature alloy steels (such as 1.2367 and 1.2369)

Stainless steel (304 and 316L)

Special corrosion-resistant alloys (for the chemical and petroleum industries)

Customization Options

U-shaped, W-shaped, and round tube cross-sections are available.

Surface treatments include sandblasting, polishing, and coating (high-temperature ceramic).

Inspection Services: Pre-shipment hydrostatic testing, magnetic particle inspection, and ultrasonic testing are available to meet diverse customer quality requirements.