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Heat treatment furnace facilities for the steel industry

HITT high temperature bell annealer facilities (HBAF)

High-temperature anneals of grain-oriented (GO) electrical strip are used to form grains with magnetically advantageous Goss textures through secondary recrystallization. The high processing temperatures (above 1150 °C) and straight hydrogen atmospheres also remove sulfur and nitrogen. A coating of MgO, added in a previous process step, inhibits the formation of stickers in the wraps.

The safety concept for processing in hydrogen has been adopted from the H2® line of bell annealers. The charge is heated by thermal energy radiating from the heating bell and inner cover.

The following advantages over other facility types are provided by the design:

  • encapsulated, gas-tight workload space ensures significantly lower atmosphere consumption (savings of up to 50 %), compared to alternative designs
  • rapid heating up and cooling, with possible hydrogen concentrations up to 100 % → significant increase in productivity compared to 100 % nitrogen atmospheres
  • further reductions in hydrogen consumption are possible if a hydrogen recycling system is installed
  • the homogenous temperature distribution within a stack, provided by patented coil supports and symmetrical heating, ensures

    • homogenous magnetic characteristics
    • shortened annealing cycles
    • an extended inner cover service life

  • Critical technical data of the workload space:
Diameter2200 mm
Charging height3000 mm
Maximum weight of charge36 t
Heating typesgas-fired, electric heated

HITT electrical strip

HITT bell annealer for electrical strip
HITT bell annealer for electrical strip

Heat treatment furnace facilities for the steel industry

HITT high temperature bell annealer facilities (HBAF)

High-temperature anneals of grain-oriented (GO) electrical strip are used to form grains with magnetically advantageous Goss textures through secondary recrystallization. The high processing temperatures (above 1150 °C) and straight hydrogen atmospheres also remove sulfur and nitrogen. A coating of MgO, added in a previous process step, inhibits the formation of stickers in the wraps.

The safety concept for processing in hydrogen has been adopted from the H2® line of bell annealers. The charge is heated by thermal energy radiating from the heating bell and inner cover.

The following advantages over other facility types are provided by the design:

  • encapsulated, gas-tight workload space ensures significantly lower atmosphere consumption (savings of up to 50 %), compared to alternative designs
  • rapid heating up and cooling, with possible hydrogen concentrations up to 100 % → significant increase in productivity compared to 100 % nitrogen atmospheres
  • further reductions in hydrogen consumption are possible if a hydrogen recycling system is installed
  • the homogenous temperature distribution within a stack, provided by patented coil supports and symmetrical heating, ensures

    • homogenous magnetic characteristics
    • shortened annealing cycles
    • an extended inner cover service life

  • Critical technical data of the workload space:
Diameter2200 mm
Charging height3000 mm
Maximum weight of charge36 t
Heating typesgas-fired, electric heated

HITT electrical strip

HITT bell annealer for electrical strip
HITT bell annealer for electrical strip

Copyright ©2018 by EBNER member of AUSTRIAN CHAMBER OF COMMERCE


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Copyright ©2018 by EBNER member of AUSTRIAN CHAMBER OF COMMERCE