公开(公告)号：EP4306664A1

公开(公告)日：2024-01-17

申请号：EP21947029.1

申请日：2021-06-22

申请人： NIPPON STEEL CORPORATION

发明人： KATOU, Naoko ,  SAKURADA, Eisaku ,  NIKAIDO, Hitoshi

IPC分类号： C21D9/46 ,  C22C38/00 ,  C22C38/58

摘要： This hot-rolled steel sheet has a predetermined chemical composition and has a metallographic structure containing ferrite with an area ratio of 53.0% or more and 76.0% or less, martensite with an area ratio of 3.0% or more and 10.0% or less, bainite with an area ratio of 14.0% or more and 39.0% or less, and pearlite with an area ratio of 2.6% or less, and with an average diameter of martensite of 0.26 µm or more and 0.70 µm or less, wherein, among all interfaces of the martensite, the total length of the interfaces between the martensite and the bainite is 75.0% or more with respect to the total length of all interfaces of the martensite.

公开(公告)号：EP4134464A1

公开(公告)日：2023-02-15

申请号：EP21785098.1

申请日：2021-03-30

申请人： NIPPON STEEL CORPORATION

发明人： TANAKA, Yasuaki ,  NIKAIDO, Hitoshi ,  KAWATA, Hiroyuki ,  SUGIURA, Natsuko

IPC分类号： C22C38/00 ,  C21D9/46 ,  C21D9/48 ,  C22C38/60

摘要： There is provided a steel sheet including a chemical composition consisting of, in mass%: C: 0.03 to 0.25%, Si: 0.1 to 2.0%, Mn: 1.0 to 3.0%, P: 0.200% or less, S: 0.0500% or less, Al: 0.01 to 1.00%, N: 0.0100% or less, and Ti: 0.01 to 0.25%, with the balance: Fe and impurities, and a steel micro-structure containing, in area%: ferrite: 50 to 85%, the balance being one or more kinds selected from martensite, bainite, and retained austenite, and an intensity of γ-fiber is more than 4.0 times in terms of random intensity ratio, and an average KAM value of grains having crystal orientations that form angles within 10° from γ-fiber is 1.30° or less.

公开(公告)号：EP3205415B1

公开(公告)日：2020-05-13

申请号：EP15849471.6

申请日：2015-10-07

申请人： Nippon Steel Corporation

发明人： NIKAIDO, Hitoshi ,  YONEBAYASHI, Toru ,  SATO, Koichi ,  ITO, Teruo ,  KAMADA, Daiki

IPC分类号： B21B1/08 ,  B21B27/02 ,  B21D53/88 ,  B21H8/00