| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method of a cold rolled steel strip having uniform material quality, especially, uniform material quality excellent in deep drawing processability over the longitudinal direction of the steel strip by preventing the deterioration of material in the tip and rear end parts of the steel strip. SOLUTION: At the time of manufacturing the cold rolled steel strip by executing hot rolling, pickling, cold rolling and continuous annealing of steel, the thicknesses in the tip and rear end parts of the steel strip at the time of hot rolling are made thicker than the finished thickness in the center part in the longitudinal direction of the steel strip. In the case the finished thickness in the center part in the longitudinal direction of the steel strip at the time of hot rolling is expressed by (t), the thicknesses in the tip and rear end parts of the steel strip are made thicker than the finished thickness (t) by the range of 5-50%.</p> |
