Patent ID: 11951520
Assignee: NIPPON STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C | IPC B

Claim 0:
1. A blank made of a steel and comprising at least two protruding regions having an outer edge protruding outward in in-plane directions,
wherein a softened part is formed at least partially in the protruding regions and the softened part is formed in at least a part of the outer edge of the protruding regions,
a Vickers hardness of the softened part is lower than a Vickers hardness of a main portion region, and
the blank comprises at least two of the protruding regions having the softened part,
wherein a tensile strength of the main portion region of the blank is 1100 MPa or more, and
wherein a tensile strength of the softened part is 1000 MPa or less.