Patent ID: 11958092
Assignee: NIPPON STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 2:
3. The production method for a hat-shaped steel sheet pile according to claim 2, wherein:
the step of performing reverse rolling comprises a step of forming the web corresponding part and the arm corresponding parts;
the caliber that performs the reverse rolling comprises a web facing portion for forming the web corresponding part and arm facing portions for forming the arm corresponding parts;
the caliber that performs the reverse rolling comprises web-side flange facing portion groups each including at least one of the second flange facing portions and arm-side flange facing portion groups each including at least one of the third flange facing portions; and
with respect to a straight line linking a boundary part between the web-side flange facing portion group and the web facing portion and a boundary part between the arm-side flange facing portion group and the arm facing portion, the second flange facing portion is in a protruding shape in a flange outside direction, and the third flange facing portion is in a protruding shape in a flange inside direction.