| 摘要 |
PROBLEM TO BE SOLVED: To prevent the development of a coil break in a steel sheet by regulating a bending related to the steel sheet temp. with specific formulas, at the time of conveying by winding the steel sheet after annealing around a roll, etc., at a specific temp. SOLUTION: The annealed steel sheet is wound around the roll, etc., at >=250 deg.C and conveyed and straightened to the flat sheet by the stress of the steel sheet after passing roll. Then, in the case of using (t) for sheet thickness of the steel sheet, E for Young's modulues of the steel sheet, D0 for diameter of bending (outer diameter of the roll) at >=250 deg.C,σec for yield stress of the steel sheet at >=250 deg.C, D for the diameter of bending (the outer diameter of the roll) at >=200 deg.C,σe for the yield stress of the steel sheet at <=200 deg.C, the bending of the steel sheet at >=250 deg.C is made to the bending within the elastic limit shown in the formula I and successively, the bending at <=200 deg.C is made to be in the range of the formula II. By this method, the development of the coil break in the steel sheet is perfectly prevented and the conveying of the steel sheet can be executed.
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