Bundle Rod Heater

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Bundle Rod Heater consists of circular ceramic beads that hold the heating elements. They are designed for long life and maintenance-free operation. Designed & manufactured in low voltages for faster heating in order to achieve temperatures quickly, these heaters can be mounted horizontally or vertically. The element can be provided in ferritic alloys up to 1250° C and Ni Cr alloy up to 1100°C materials.

Construction

1. Direct heating element wire

2. Ceramic Disc : for hold the heating element & insulation

3. Fiber Disc : for holds the terminal rod and prevent heat loss

4. Center rod : for alignment & take weight of heater bundle

 

Advantages

  • Carbon Dioxide emissions are reduced to avoid the corrosion of furnace gas to heating element or avoid the contact of burning outcome.
  • Convenient to control  temperature, assemble and maintenance and easy to seal.
  • Can be Horizontal or vertical mounted
  • Better technical properties and longer working life 
  • Higher resistivity & surface load
  • Free from oxide debris
  • Cost-effective with High watt density output.
  • Heating element

    Ferritic alloy powder metallurgical element, Mara FeCrAl, NiCr 80/20

  • Watt Density

    1/10 W/cm2

  • Max. Temperature

    Up to 1250°C

  • Cold resistance tolerance

    ≤3%

  • Power

    1 kW to 75 kW

Physical and Mechanical Properties of Ferritic alloys & Nichrome element

Heating Element Grade


 

Mara FeCrAl -Super

Mara FeCrAl-60

Mara FeCrAl-55

Mara FeCrAl-48

Mara Nichrome-80/20

Standard chemical composition  %

Al

6

6

5.5

4.8

Ni-80

Cr

23

23

23

23

20

Fe

Balance

Balance

Balance

Balance

0

Max continuous operating temperature

1420

1400

1300

1200

1200

Melting point

1500

1500

1500

1500

1400

Electric resistivity at 20℃

μΩ-m

1.45±5%

1.45±5%

1.40±5%

1.42±5%

1.08±5%

Density

g/cm3

7.1

7.1

7.2

7.2

8.4

Thermal expansion factor 20℃〜1,000℃

-1

14.8X10-6

13.6X10-6

13.6X10-6

14.8X10-6

17.6X10-6

Tensile strength 

N/mm2

650 〜900

650 〜900

650 〜900

630 〜850

700 〜900

Elongation

15 〜25

15 〜25

15 〜30

10 〜30

20 or more

Hardness 

Hv

220〜240

220〜240

220〜240

220〜240

150 〜190

Repeat bending frequency

F/R

≥5

≥5

≥5

≥5

 

Continuous service time

Hours/℃

≥300/1300

≥300/1300

≥300/1300

≥100/1300

≥300/1200

Magnetic properties

 

Magnetic

Magnetic

Magnetic

Magnetic

Non-Magnetic

 

Bundle Rod Heater Accessories

Radiant Tube

Stainless steel SS grade, Incoloy, PMD, Cast alloys

Thickness of Tube

1.5 to 8mm

Length of Tube

300 to 5000mm (customize diameter & length)

Hangers

Mara FeCrAl, NiCr  80/20 

Flange

MS, SS grade

Thermocouple Pocket

Alumina Tube(ceramic)

Control

Thermocouple, RTD’s, Thermostat

 

Application Areas

  • For melting furnace and aluminium holding
  • In steel industries, for galvanizing furnace
  • In automotive industries, heat treatment furnace 
  • Annealing furnace
  • Carburizing furnace