METHOD OF MANUFACTURING COLD-ROLLED STEEL BAND

PROBLEM TO BE SOLVED: To reduce fluctuation in thickness and width of a cold-rolled steel band product and obtain desired sheet thickness and width by resetting target values and/or width of the cold-rolled steel sheet to be charged into continuous annealing on the basis of actual component records of steel of actual products and actual manufacturing conditions of hot rolling. SOLUTION: Preset target value of thickness and width of cold-rolled steel band to be inserted into continuous annealing are once cancelled, and they are calculated again and corrected in consideration of dimensional decreasing volume when continuous annealing is done, on the basis of the actual steel component records of actual products and actual manufacturing conditions of hot rolling, and the values are reset in the actual product information. Alternatively, preset target values of hot-rolled thickness and width, cold-rolled thickness, and width after pickling are once cancelled, and the values are corrected by re-calculating them in proper consideration of decreases in sheet thickness and width of actual products, on the basis of actual steel composition records of actual products and actual manufacturing conditions of hot rolling, and the values are reset in the actual product information. Thus, the dimensions after continuous annealing are made uniform and products of desired dimensions are finally obtained.