Patent ID: 6964711
Filing Date: 2005-11-15
Classification: C21D

Abstract:
1. A process for the production of electrical grain oriented Fe-Si strips in which a Si-containing molten alloy composition is directly cast as continuous strips 2.5 to 5 mm thick, cold rolled in one step or more steps with intermediate annealing to a final thickness of between 1 and 0.15 mm, the strip being then continuously annealed to carry out oriented secondary recrystallisation, characterised in that after the strip solidification and before coiling of said strip in a coiling phase, a ferrite to austenite transformation is induced in the metal matrix via deformation, by rolling said strip between two cooled rolls to obtain a deformation over 20% in a temperature range of 1000–1300° C., thereby producing a volume fraction of austenite to be between 25 and 60%, said molten alloy composition being chosen such that said volume fraction of austenite is stable in a temperature interval of between 1100 and 1200° C.