| 摘要 |
PURPOSE: A method for fabricating a steel sheet is provided to prevent an edge break phenomenon of a steel sheet coil by evaluating an edge break defect through an edge drop ratio obtained based on a thickness difference between an end part and a center part of the steel sheet. CONSTITUTION: A hot rolled steel sheet is fabricated into a cold rolled steel sheet having thickness of 0.1 to 2.5mm through a tandem mill. In order to remove an edge break defect of the steel sheet, a thickness variation of the steel sheet is inspected. Then, an edge drop ratio is obtained based on a thickness difference between an end part and a center part of the steel sheet. The edge drop ratio is defined as (T50-Tx)/T50, wherein T50 is thickness of a predetermined portion of the steel sheet, which is remote widthwise from an end part of the steel sheet, and Tx is thickness of the end part of the steel sheet. The edge drop ratio is set below 2.7% by transversely moving a work roll.
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