Annealing and Coating Line (ACL) for Silicon Steel Strip

Tenova, with its over 40 years of experience, is one of the company with the competence and knowledge, of the entire thermal process, which is required for the production of non-grain-oriented electrical 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. The next step is in-line coating with insulating varnishes of different qualities, then a drying process in a special drying furnace, which is generally fitted with a thermal afterburner. Waste heat from the process is efficiently utilized for strip cleaning and drying.

The cleaning section is equipped with the special high-turbulence high-efficiency density (HTHE) electrolytic cleaning tank to enhance the strip cleaning. The strip is brushed with the high efficiency - quick maintenance brushing units of the brush-to-brush type.

Special steering rolls are able to improve the camber at furnace exit. Special Roll coaters for NGO insulation coating with on-line coating control system (closed loop) and Insulating varnish preparation and recirculation systems.