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Heat treatment furnace facilities for the steel industry

HICON/H2® decarburizing and coating line (DCL) for the production of grain-oriented (GO) electrical strip

After cold rolling, grain-oriented (GO) electrical strip is heat treated in a continuous furnace to decarburize and recrystallize it. This process takes place in a finely-tuned and precisely-maintained furnace atmosphere. The highly-efficient and consistent decarburization process inhibits magnetic aging, and ensures the long-term efficiency of a transformer. The process steps for this production step are as follows:

  • Multi-stage strip cleaning
  • Rapid strip heating in the heating up section of a continuous furnace (optionally with rapid heating systems up to 500K/s)
  • Decarburization in a dedicated zone of the continuous furnace
  • Optional: Nitriding zone for highly-permeable grades (HGO)
  • Controlled cooling in the slow cooling zone and final cooling zone
  • Optional: In-line MgO coating and drying

The following advantages are provided by the  facility design:

  • Precise atmosphere flow and exact control of the atmosphere humidification and supply systems ensure that the highest production capacity and high decarburization speeds are achieved
  • Extremely low carbon contents (< 0.0030 % C, 30 ppm) ensure the best possible magnetic properties without aging
  • State-of-the-art burner/radiant tube technology and rapid heating-up systems provide high heating gradients, ensuring efficient decarburization and improved texture (crystalline orientation)
  • In the cooling zone, homogeneous controlled cooling ensures excellent strip geometry and excellent magnetic properties

Decarburizing lines

Decarburizing and coating line (DCL)

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Copyright ©2018 by EBNER member of AUSTRIAN CHAMBER OF COMMERCE