Method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along rolling direction of coil and a roll cooling controller for cold rolling mill using the cold rolling method

A method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along the rolling direction of a coil, said cold rolling being performed prior to a primary and a secondary recrystallization, comprising controlling the temperature of a steel sheet along said rolling direction of said coil immediately downstream of the outlet roll bites of one or more rolling paths to a range of about 7.degree. C. or less, and controlling the temperature of one or more of said rolling paths to between about 150.degree. C. to about 350.degree. C.

A method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along the rolling direction of a coil, said cold rolling being performed prior to a primary and a secondary recrystallization, comprising controlling the temperature of a steel sheet along said rolling direction of said coil immediately downstream of the outlet roll bites of one or more rolling paths to a range of about 15.degree. C. or less by controlling the flow rate of coolants in said rolling path and controlling the temperature of one or more of said rolling paths between about 150.degree. C. to about 350.degree. C.

A method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along the rolling direction of a coil, said cold rolling being performed prior to a primary and a secondary recrystallization, comprising controlling the temperature of a steel sheet along said rolling direction of said coil immediately downstream of the outlet roll bites of one or more rolling paths by measuring a steel sheet temperature immediately downstream of the outlet roll bites of said rolling paths and controlling the flow rate of a coolant to one or more rolls of the rolls constituting a cold rolling mill based on said measured steel sheet temperature so that the steel sheet temperature immediately downstream of the outlet roll bites of the rolling paths is controlled to a range of about 15.degree. C. or less, and controlling the temperature of one or more of said rolling paths between about 150.degree. C. to about 350.degree. C.

A method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along the rolling direction of a coil, said cold rolling being performed prior to a primary and a secondary recrystallization, comprising controlling the temperature of a steel sheet along said rolling direction of said coil immediately downstream of the outlet roll bites of one or more rolling paths to a range of about 7.degree. C. or less by controlling the flow rate of coolants in said rolling path and controlling the temperature of one or more of said rolling paths between about 150.degree. C. to about 350.degree. C.

A method of cold rolling grain-oriented silicon steel sheet having excellent and uniform magnetic characteristics along the rolling direction of a coil, said cold rolling being performed prior to a primary and a secondary recrystallization, comprising controlling the temperature of a steel sheet along said rolling direction of said coil immediately downstream of the outlet roll bites of one or more rolling paths by measuring a steel sheet temperature immediately downstream of the outlet roll bites of said rolling paths and controlling the flow rate of a coolant to one or more rolls of the rolls constituting a cold rolling mill based on said measured steel sheet temperature so that the steel sheet temperature immediately downstream of the outlet roll bites of the rolling paths is controlled to a range of about 7.degree. C. or less, and controlling the temperature of one or more of said rolling paths between about 150.degree. C. to about 350.degree. C.