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

Claim 1:
2. The production method for a hat-shaped steel sheet pile according to claim 1, wherein
the intermediate rolling comprises a step of performing reverse rolling on the material to be rolled by a same caliber, wherein:
the step of performing reverse rolling comprises a step of forming first flange parts across a neutral line and second and third flange parts arranged on both sides of the first flange parts;
a caliber that performs the reverse rolling comprises first flange facing portions for forming the first flange parts, second flange facing portions for forming the second flange parts, and third flange facing portions for forming the third flange parts; and
an inclination angle of the first flange facing portion with respect to a horizontal plane is larger than inclination angles of the second and third flange facing portions.