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Heat treatment innovations for more than 100 years!
Flattening and Coating Line (FCL) for Silicon Steel Strip
For the final heat treatment process the transformer strip is coated with insulating varnish in an in-line process and then dried in an indirectly heated furnace. The steel strip is heated further in a radiant tube furnace with a controlled atmosphere and then straightened using the integrated hot stretching equipment. This stage is followed by a slow cooling process.
Flattening and Coating Line (FCL)
LOI Thermprocess, with its over 40 years of experience, is the only company with the competence and knowledge, of the entire multi-stage thermal process chain, which is required for the production of grain-oriented electrical steel strip.
In the final stage of the heat treatment process, transformer strip is coated with insulating varnish in an in-line process and then dried in an indirectly heated furnace. The steel strip is heated further in a radiant tube furnace with a controlled atmosphere and then straightened using the integrated hot stretching equipment. This stage is followed by a slow cooling process.
Tenova Flattening and Coating Lines for Silicon Steel Strip are based on the following unique technologies:
- Special uncoiler suction hoods, dry brushes, filtering unit to eliminate detached MgO during un-coiling
- MgO brushing-rinsing unit with special settling tanks
- Light pickling unit to eliminate residual MgO
- Special 4-roll coaters (double in standby) for insulation coating (Carlite or S3 tensioning coating)
- Accurate tension control; special steering rolls at Furnace exit to improve camber
- Insulating varnish recirculation systems at controlled temperature
- Laser Scribing units (in-line or off-line)
Latest improvements:
- Light pickling unit to eliminate residual MgO
- Accurate tension control
- Insulating varnish recirculation systems at controlled temperature
- Laser scribing units (in-line or off-line)
Value for Money
- Key technology for the processing of silicon steel
- Highest process accuracy and repeatability guarantees stable magnetic properties
Reference
- Worldwide reference installations at nearly all silicon steel producers
Digitalization
- Fully automated control system
- Various software modules for process optimization
Efficiency
- Modern heating technology
- Heat and energy recovery
- Reduced consumption of rinse water
- Reduced waste waters (contaminated with MgO and relevant salt)
Safety
- Improved safety conditions in Entry section
Contact - List
Contact Contact Person Position Legal Entity Department Phone Fax E-mail Address LOI Thermprocess GmbH +49 201 1891-1 +49 201 1891-321 loi@tenova.com Am Lichtbogen 29
45141 Essen
Germany
Contact Contact Person Position Legal Entity Department Phone Fax E-mail Address General tenova@tenova.com Via Albareto 31
16153 Genova
Italy
Processing Lines for Silicon Steel
Annealing and Coating Line (ACL) for Silicon Steel Strip
Non-grain-oriented strip is annealed in a radiant tube furnace using a continuous process after cold rolling to ensure recrystallization and controlled grain growth. Top-quality steel requires strip temperatures above 1100°C and a very dry atmosphere with a high hydrogen content. This is followed by controlled cooling to obtain an extremely flat strip.
Annealing and Pickling Line (APL) for Silicon Steel Strip
The hot rolled strips (NGO and GO) are initially annealed in a continuous process to eliminate brittleness prior to cold rolling and to modify the microstructure. The annealing process is followed by a controlled cooling stage with a cooling rate which may range from 5 to 80 K/s depending on the steel grade required.
Decarburizing and Coating Line (DCL) for Silicon Steel Strip
Cold rolled GO Si steel strip is annealed in a continuous process line for primary recrystallization and decarburization. After the steel strip has passed through the DCL furnace, it is coated with magnesium oxide and then dried.
Lamination Furnace for Semi-Finished Silicon Steel Strip
Semi-finished electrical steel requires an annealing process with recrystallizing, decarburizing and blueing. The punched laminations are continuously annealed in a roller hearth furnace or for smaller capacity in a pusher type furnace.
