To suppress the shape defect at a bite end part of a material to be rolled at a bending rolling stage of a rough rolling step to achieve improvements in productivity such as an improvement in yields and a decrease in crop in production of a steel sheet pile. A production method for producing a steel sheet pile by reducing a raw material in a rectangular cross-section, includes a rough rolling step, an intermediate rolling step, and a finish rolling step, wherein a rolling mill configured to perform the rough rolling step is provided with a caliber configured to perform bending rolling of extending a thickness center line length of the raw material and rolling and shaping the raw material from a rectangular cross-sectional shape to a substantially steel sheet pile cross-sectional shape, and wherein in the bending rolling, rolling that a reduction amount with respect to a predetermined section of a bite end part of the raw material is smaller than a reduction amount with respect to a part other than the predetermined section is performed.

To suppress the shape defect at a bite end part of a material to be rolled at a bending rolling stage of a rough rolling step to achieve improvements in productivity such as an improvement in yields and a decrease in crop in production of a steel sheet pile. A production method for producing a steel sheet pile by reducing a raw material in a rectangular cross-section, includes a rough rolling step, an intermediate rolling step, and a finish rolling step, wherein a rolling mill configured to perform the rough rolling step is provided with a caliber configured to perform bending rolling of extending a thickness center line length of the raw material and rolling and shaping the raw material from a rectangular cross-sectional shape to a substantially steel sheet pile cross-sectional shape, and wherein in the bending rolling, rolling that a reduction amount with respect to a predetermined section of a bite end part of the raw material is smaller than a reduction amount with respect to a part other than the predetermined section is performed.

Work roll balance force setting method of rolling mill. Determine kiss roll load Pk, rolling load Pr, and rolling torque Tr of work rolls relative to work roll angle x of tip position of rolled material between start and completion of biting of rolled material using mill longitudinal rigidity coefficient K and rolling condition. Determine traction coefficient rt between work and intermediate rolls, and maximum value rtmax of rt in relation to x when hypothetical work roll balance force Pb is applied from sum P of Pk, Pr, and Pb, and Tr between start and completion of biting. Compare tolerated value rter of rt with rtmax. Work roll balance force at start of biting reset to equal to or larger than required when rt assumes maximum value rtmax, and equal to or smaller than limit based on strength of rolling mill, when rter is equal to or larger than rtmax.