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

Claim 3:
4. A component made of a steel and comprising:
a bottom surface portion;
a first vertical wall portion and a second vertical wall portion which stand upright from an end portion of the bottom surface portion; and
at least two corner portions provided between the first vertical wall portion and the second vertical wall portion,
wherein a softened part is formed at least partially in the corner portion,
a Vickers hardness of the softened part is lower than a Vickers hardness of a main portion region of the component, and
the component comprises at least two of the corner portions having the softened part,
wherein a tensile strength of the main portion region of the component is 1100 MPa or more, and
wherein a tensile strength of the softened part is 1000 MPa or less.