Bundle Rod Heater

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