Cold rolling method, method of producing steel sheet, cold rolling line, and steel sheet production line

Abstract

Provided are a cold rolling method, a method of producing a steel sheet, a cold rolling line, and a steel sheet production line that can suppress the occurrence of fracture. The cold rolling method includes: a process of calculating a leveling target value for a cold mill (10) that carries out cold rolling on rolled material, the calculation being based on an index of an asymmetric component of an elongation difference rate distribution of the rolled material after cold rolling at delivery of the cold mill; and a process of executing leveling control of the cold mill. The index of the asymmetric component of the elongation difference rate distribution is calculated based on a correlation between the elongation difference rate distribution and an odd function, where the odd function is obtained by multiplying a first-order power function by an absolute value power function that is greater than zero-order.

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