| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of batch-annealing a steel sheet suppressing occurrence of inner stress of a steel sheet by increasing the cooling efficiency of a steel sheet coil inner peripheral surface by air blast cooling performed during annealing, thereby increasing production yield.SOLUTION: In a method of batch-annealing a steel sheet that annealing is performed by inserting a steel sheet coil that a steel sheet is wound like a coil into a batch annealing surface, while annealing the steel sheet coil, air blast cooling that a cooling medium is jetted out from a cooling device installed within a central space of the steel sheet coil to cool an inner peripheral surface of the steel sheet coil is performed. In that occasion, the cooling medium is revolved along the inner peripheral surface of the steel sheet coil. |
