Jfe Steel Corporation

Kengo Tsukamoto

Kenji Suzuki

Provided is a cold rolling method by which the occurrence of wrinkles during cold rolling can be prevented without having to modify a mill. A cold rolling method of rolling a steel sheet in multiple rolling passes using a cold mill, the method including when the steel sheet unit tension Nduring steady-state rolling exceeds the reference unit tension Nin a specific rolling pass in which the target sheet thickness ton an exit side of the rolling pass is less than or equal to a reference sheet thickness, controlling the steel sheet unit tension Nin an initial stage of rolling on an entry side of the specific rolling pass to be less than the reference unit tension Nand less than the steel sheet unit tension Nduring the steady-state rolling, the reference unit tension Nis calculated by the formula (1): N=(150/9)t+27.1.

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Tokyo, Japan

Kengo Tsukamoto