Annealing furnace HITT
heat treatmentbellgas

annealing furnace
annealing furnace
annealing furnace
annealing furnace
annealing furnace
annealing furnace
annealing furnace
annealing furnace
annealing furnace
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Characteristics

Function
heat treatment, annealing
Configuration
bell
Heat source
gas
Atmosphere
nitrogen, hydrogen, 100% hydrogen atmosphere
Other characteristics
high-temperature, for steel
Maximum temperature

Min.: 0 °C
(32 °F)

Max.: 1,150 °C
(2,102 °F)

Description

High-temperature anneals (HTA) 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 step, inhibits the formation of stickers in the wraps. The safety concept for processing in hydrogen has been adopted from HICON/H2 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 EBNER 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 and extends the service life of the inner covers

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