PROCESS FOR THE PRODUCTION OF GRAIN ORIENTED ELECTRICAL STEEL STRIPS

摘要

Process for the production of grain oriented electrical Fe-Si strips in which a Si-containing alloy is directly cast as strip 2,5-5 mm thick, cold rolled in one stage or in more stages with intermediate annealing to a final thickness of 1-0,15 mm, the strip being then continuously annealed to carry out the primary recrystallisation and then annealed to carry out the oriented secondary recrystallisation, characterised in that after solidification of the strip and before its coiling a phase transformation from Ferrite to Austenite is induced into the metal matrix for a volume fraction comprised between 25 and 60 %, obtained by controlling the alloy composition so that said Austenite fraction is allowed within the stability equilibrium between the two phases, and deforming the strip by rolling in-line with the casting step to obtain a deformation higher than 20 % in the temperature interval 1000-1300 DEG C.