| 摘要 |
PROBLEM TO BE SOLVED: To obtain a very thin cold rolled steel sheet in which generation of an adhesion defect is suppressed when intermediate annealing by batch annealing is inserted, and two times of cold rolling are performed to produce a very thin cold rolled steel sheet, and a sheet shape (flatness) is favorable.SOLUTION: In a production of a very thin cold rolled steel sheet in which a hot rolled steel sheet is performed by cold rolling, then subjected to batch annealing, and then further subjected to cold rolling; take-up tensile force of a steel sheet coil provided to batch annealing is made 30-45 MPa, and a heating rate is made 10-17°C/hr, and annealing temperature is made 550-680°C in batch annealing. |
