公开(公告)号：US20240117477A1

公开(公告)日：2024-04-11

申请号：US18273472

申请日：2022-02-10

申请人： NIPPON STEEL CORPORATION

发明人： Kodai MURASAWA ,  Shingo FUJINAKA ,  Yuri TODA

IPC分类号： C22C38/32 ,  B32B15/01 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28

CPC分类号： C22C38/32 ,  B32B15/011 ,  C21D1/18 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0221 ,  C21D8/0247 ,  C21D8/0278 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C21D2211/001 ,  C21D2211/008

摘要： This hot-stamping formed body includes, as a chemical composition, by mass %: C: 0.15% or more and 0.50% or less; Si: 0.10% or more and 3.00% or less; Mn: 0.10% or more and 3.00% or less; P: less than 0.10%; S: less than 0.10%; N: less than 0.10%; Ti: 0.020% or more and 0.150% or less; B: 0.002% or more and 0.010% or less; optionally Al, Cr, Mo, Co, Ni, Cu, V, W, Ca, Mg, and REM; and a remainder including Fe and impurities, in which a microstructure of the hot-stamping formed body includes, by volume fraction, 85% or more of martensite and less than 15% of retained austenite, and in the microstructure, a standard deviation of a frequency distribution of nanohardnesses is 0.70 GPa or less, and an average grain size is 4.0 μm or less.

公开(公告)号：US20230002874A1

公开(公告)日：2023-01-05

申请号：US17781231

申请日：2021-01-08

申请人： NIPPON STEEL CORPORATION

发明人： Yuri TODA ,  Shinichiro TABATA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA

IPC分类号： C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/16 ,  C22C38/10 ,  C22C38/08 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

摘要： A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is 5% or more and less than 10%. Among grain boundaries of crystal grains of bainite and tempered martensite in the microstructure, a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and a grain boundary having a rotation angle in a range of 55° to 75° to the direction as a rotation axis is 30% or more. The tensile strength of the hot-stamping formed body is 1500 MPa or more.

公开(公告)号：US20230001466A1

公开(公告)日：2023-01-05

申请号：US17781325

申请日：2021-01-08

申请人： NIPPON STEEL CORPORATION

发明人： Yuri TODA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA

IPC分类号： B21D22/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/60 ,  C21D1/18

摘要： A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is 10% or more and less than 20%, Among grain boundaries of crystal grains of bainite and tempered martensite a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and the grain boundary having a rotation angle in, a range of 55° to 75° to the direction as a rotation axis is 30% or more.

公开(公告)号：US20240270325A1

公开(公告)日：2024-08-15

申请号：US18563240

申请日：2022-05-25

申请人： NIPPON STEEL CORPORATION

发明人： Masahiro KUBO ,  Shunji HIWATASHI ,  Yutaka MIKAZUKI ,  Koichi SATO ,  Takahiro AITOH ,  Kengo TAKEDA ,  Katsuya NAKANO ,  Yuri TODA ,  Shinichiro TABATA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA ,  Kazuhisa KUSUMI ,  Shingo FUJINAKA ,  Jun HAGA ,  Ryo TABATA ,  Ryoma KATO ,  Mitsuharu YAMAGATA ,  Toshiyuki NIWA ,  Hiromi ASAMA ,  Junichiro SUZUKI ,  Yasunori ITO

IPC分类号： B62D29/00 ,  B23K11/11 ,  B23K103/04 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60

CPC分类号： B62D29/007 ,  B23K11/11 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60 ,  B23K2103/04 ,  C21D2211/002 ,  C21D2211/008

摘要： What is provided is an automobile body in which batteries, tires, and liquids containing water and oil are removed from a public road vehicle with superior collision safety, the public road vehicle comprising at least a steel material containing a steel sheet with a tensile strength of 1180 MPa or higher, a non-ferrous metal material, and a resin material, wherein



the ratio of a mass mh (kg) of the steel sheet having a tensile strength of 1180 MPa or higher to a mass m (kg) of the automobile body is 9% or higher, and
a mass m (kg) of the automobile body and a projected area s (m2) of the automobile body from an upper side satisfy a formula (1) and a formula (2)











6

公开(公告)号：US20230040050A1

公开(公告)日：2023-02-09

申请号：US17781239

申请日：2021-01-08

申请人： NIPPON STEEL CORPORATION

发明人： Yuri TODA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA

IPC分类号： C22C38/60 ,  C22C38/38 ,  C22C38/34 ,  C22C38/30 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/48 ,  C21D8/02 ,  C21D6/00 ,  B21D22/02

摘要： A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is in a range of 20% to 30%. Among grain boundaries of crystal grains of bainite and tempered martensite in the microstructure, a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and a grain boundary having a rotation angle in a range of 55° to 75° to the direction as a rotation axis is 30% or more.