Hot-rolled steel sheet pickling line APL

The hot rolled strips (NGO and GO) are initially side trimmed through a rotating turret trimmer, annealed in a continuous process to eliminate brittleness prior to cold rolling and to modify the microstructure. Process following the Recrystallization Annealing are mainly the mechanical descaling and the Pickling to fully eliminate scale and Si oxide underneath the scale. Tenova, 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. The hot rolled strips (NGO and GO) are initially side trimmed through a rotating turret trimmer,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. This process is usually carried out in a nitrogen atmosphere to protect the strip surface. Process following the recrystallization Annealing are: the Scale Breaking, or more frequently Hi Si grades a Shot Blasting section to partially eliminate the scale from the strip surface, a pre rinsing section to pre-heat and pre-wet the strip surface, the pickling and accurate rinsing section to fully eliminate scale and Si oxide underneath the scale. All the mechanical equipment and strip preheaters designed to thread brittle strips especially before the Annealing Furnace. Terminal Equipment and Process Section present specialties like: Pay Off Reels provided with double expansion mandrels,