Process for manufacturing grain non oriented magnetic steel sheet and sheet obtained thereby.

摘要

This process, comprising successively after production under vacuum of a steel with a low silicon content: - a hot rolling operation followed by reeling; - a shot-blasting and pickling operation: - a cold rolling operation in one or more stages followed by annealing, to obtain a sheet of the final thickness, the final annealing being carried out under a decarbonising controlled atmosphere, is characterised in that the steel sheet has the following composition by weight: - carbon < 0.008% - silicon < 0.4% - manganese (0.05-0.4)% - sulphur < 0.01% - phosphorus < 0.19% - nitrogen < 0.01% - oxygen < 0.01%, the reeling following the hot rolling is carried out at a temperature above 600 DEG C and is itself followed by a heat treatment at a temperature above 700 DEG C.