Method for producing hat-shaped steel sheet pile

Abstract

To suppress a material amount deficiency in arm parts which occurs at a rough shaping stage to produce a hat-shaped steel sheet pile product in a good shape when a large-size hat-shaped steel sheet pile is produced using a raw material in a rectangular cross-sectional shape (slab). A production method for producing a hat-shaped steel sheet pile by reducing a rectangular cross-sectional raw material, includes: edging rolling of performing reduction in a width direction on the rectangular cross-sectional raw material; and a first forming rolling of performing reduction in which a cross section of a material to be rolled after the edging rolling is formed into a substantially hat-shaped cross-sectional shape, wherein in the edging rolling, reduction in which a thickness of end parts in the width direction of the material to be rolled is increased using an edging caliber being a restraining caliber having a caliber bottom width T3 larger than a thickness T1 of the rectangular cross-sectional raw material to form into a dog-bone shape is performed.

What is claimed is: 
     
         1 . A production method for producing a hat-shaped steel sheet pile by reducing a rectangular cross-sectional raw material, the production method comprising:
 edging rolling of performing reduction in a width direction on the rectangular cross-sectional raw material; and   a first forming rolling of performing reduction in which a cross section of a material to be rolled after the edging rolling is formed into a substantially hat-shaped cross-sectional shape,   wherein in the edging rolling, reduction in which a thickness of end parts in the width direction of the material to be rolled is increased using an edging caliber being a restraining caliber having a caliber bottom width T 3  larger than a thickness T 1  of the rectangular cross-sectional raw material to form into a dog-bone shape is performed.   
     
     
         2 . The production method for the hat-shaped steel sheet pile according to  claim 1 ,
 wherein in the edging rolling, a range Wa in which a thickness is increased in the width direction of the rectangular cross-sectional raw material is set as a range corresponding to a part or a whole of a width Wb of a portion corresponding to an arm of the material to be rolled in the first forming rolling.   
     
     
         3 . The production method for the hat-shaped steel sheet pile according to  claim 2 ,
 wherein in the edging rolling, the range Wa in which a thickness is increased in the width direction of the rectangular cross-sectional raw material is defined by a portion having a thickness larger than the caliber bottom width T 3  of the edging caliber, and   wherein a relation between the range Wa in which a thickness is increased in the width direction of the rectangular cross-sectional raw material and the width Wb of the portion corresponding to the arm of the material to be rolled in the first forming rolling satisfies Wa≤Wb.