A process for the production of grain oriented magnetic strip, wherein a silicon steel is cast,solidified and subjected in sequence to optional heating, hot rolling, cold rolling, annealing, characterized in that: - the steel has a composition expressed in percent by weight consisting of: Si 2.0%-5.0%, C up to 0.1%, S 0.004%-0.040%, Cu up to 0.4%, Mn up to 0.5%, being Cu+Mn up to 0.5%, optionally N 0.0030%-0.0120%, optionally Al 0.0100%-0.0600%and, optionally, at least one of Niobium + Vanadium + Zirconium + Tantalum + Titanium + Tungsten up to 0.1%, at least one of Chromium + Nickel + Molybdenum up to 0.4%, at least one of Tin + Antimony up to 0.2% and at least one of Bismuth + Cadmium + Zinc up to 0.01%, the remaining being Fe and unavoidable impurities; - the steel is solidified as slab or ingot having a thickness equal or greater than 20 mm and hot rolled at the temperature range 1350 800 °C, obtaining a hot rolled sheet having a thickness comprised between 3,5 mm and 12,0 mm, - the hot rolled sheet so obtained is, without annealing, cold rolled, wherein the total reduction ratio is not lower than 90% and not higher than 98%, being the cold rolling applied by the following sequence: first cold rolling with a reduction ratio comprised between 20% and 60% at a temperature in the range comprised between 30°C and 300°C; annealing to temperature comprised between 800°C and 1150°C in a time comprised in the range between 30 s and 900 s; second cold rolling to final thickness with a reduction ratio comprised between 70% and 93% in one or several stages with optional annealing to a temperature comprised in the range between 800°C and 1150°C and in a time comprised in the range between 30 s and 900 s. - the steel has a composition expressed in percent by weight consisting of: Si 2.0%-5.0%, C up to 0.1%, S 0.004%-0.040%, Cu up to 0.4%, Mn up to 0.5%, being Cu+Mn up to 0.5%, optionally N 0.0030%-0.0120%, optionally Al 0.0100%-0.0600%and, optionally, at least one of Niobium + Vanadium + Zirconium + Tantalum + Titanium + Tungsten up to 0.1%, at least one of Chromium + Nickel + Molybdenum up to 0.4%, at least one of Tin + Antimony up to 0.2% and at least one of Bismuth + Cadmium + Zinc up to 0.01%, the remaining being Fe and unavoidable impurities; - the steel is solidified as slab or ingot having a thickness equal or greater than 20 mm and hot rolled at the temperature range 1350 800 °C, obtaining a hot rolled sheet having a thickness comprised between 3,5 mm and 12,0 mm, - the hot rolled sheet so obtained is, without annealing, cold rolled, wherein the total reduction ratio is not lower than 90% and not higher than 98%, being the cold rolling applied by the following sequence: first cold rolling with a reduction ratio comprised between 20% and 60% at a temperature in the range comprised between 30°C and 300°C; annealing to temperature comprised between 800°C and 1150°C in a time comprised in the range between 30 s and 900 s; second cold rolling to final thickness with a reduction ratio comprised between 70% and 93% in one or several stages with optional annealing to a temperature comprised in the range between 800°C and 1150°C and in a time comprised in the range between 30 s and 900 s. first cold rolling with a reduction ratio comprised between 20% and 60% at a temperature in the range comprised between 30°C and 300°C; annealing to temperature comprised between 800°C and 1150°C in a time comprised in the range between 30 s and 900 s; second cold rolling to final thickness with a reduction ratio comprised between 70% and 93% in one or several stages with optional annealing to a temperature comprised in the range between 800°C and 1150°C and in a time comprised in the range between 30 s and 900 s.