公开(公告)号：US20250146111A1

公开(公告)日：2025-05-08

申请号：US18837633

申请日：2023-03-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuma ASADA ,  Yuri TODA ,  Yasuyuki OGISU ,  Tamaki SUZUKI

IPC: C22C38/38 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32

Abstract: Provided is a steel sheet for hot stamping having a predetermined chemical composition and a metallographic structure comprising, by area ratio, ferrite: 10% or more and pearlite: 10% or more, wherein a total of ferrite and pearlite is 80% or more, and a dispersion index of pearlite is 0.50 or more. Further, provided is a hot stamped part having a predetermined chemical composition and a metallographic structure comprising, by area ratio, at least one of martensite, bainite, and tempered martensite in a total of 90% or more, wherein a standard deviation in a hardness distribution of prior austenite grains at a sheet thickness ¼ position is 150 Hv or less.

公开(公告)号：US20240401163A1

公开(公告)日：2024-12-05

申请号：US18697364

申请日：2022-10-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuyuki OGISU ,  Takeshi TOYODA

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: This hot-rolled steel sheet has a predetermined chemical composition and a microstructure, in which, in a texture of a surface layer region, pole densities of {001} , {111} , and {112} orientation groups are 2.0 or more, in a texture of an internal region, a pole density of a {110} orientation is 5.0 or less, and a tensile strength is 1,180 MPa or more.