公开(公告)号：US20230220510A1

公开(公告)日：2023-07-13

申请号：US18010871

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D8/02 ,  C23C2/06 ,  C23C2/40 ,  C25D3/22

CPC classification number: C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C23C2/06 ,  C23C2/40 ,  C25D3/22 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.60% or more and less than 0.85%, and a steel microstructure with an area fraction of ferrite: less than 40%, tempered martensite and bainite: 40% or more in total, retained austenite: 3% to 15%, and ferrite, tempered martensite, bainite, and retained austenite: 93% or more in total. A 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction causes a change of 0.40 or more in (a grain size in a thickness direction)/(a grain size in a direction perpendicular to the thickness) of the tempered martensite in an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side. The steel sheet has a tensile strength of 980 MPa or more.

公开(公告)号：US20220056552A1

公开(公告)日：2022-02-24

申请号：US17432349

申请日：2019-11-21

Applicant: JFE STEEL CORPORATION

Inventor： Shimpei YOSHIOKA ,  Yoshihiko ONO ,  Katsutoshi TAKASHIMA ,  Takayuki FUTATSUKA ,  Kentaro SATO

IPC: C21D9/48 ,  C21D8/02 ,  C21D6/00 ,  B32B15/01 ,  C23C2/40 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/60 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A hot-pressed member having excellent bending collapsibility, a method for manufacturing the same, and a method for manufacturing a steel sheet for the hot-pressed member. The hot-pressed member includes a steel sheet as a base material, the steel sheet having a specified chemical composition. The hot-pressed member has a microstructure in which a martensite microstructure is present in a volume fraction of 70% or greater, and a number density of inclusions having a longest diameter of 25 μm or greater is 0.02/mm2 or less. The hot-pressed member has a tensile strength of 1.8 GPa or greater.

公开(公告)号：US20240411960A1

公开(公告)日：2024-12-12

申请号：US18688970

申请日：2022-09-01

Applicant: JFE STEEL CORPORATION

Inventor： Takashi IWAMA ,  Kentaro SATO

IPC: G06F30/23 ,  G06F30/15 ,  G06F119/08

Abstract: The behavior of a panel component in the plate thickness direction can be analyzed with greater accuracy. A joint structure in which a panel component and a reinforcing component facing together are connected through one or more elastic adhesives is modeled. A panel component behavior analysis method analyzes the behavior of the panel component by finite element analysis using a computer. From actually measured heating or cooling data of the elastic adhesive, an elastic coefficient including change in elastic coefficient of the elastic adhesive in response to temperature change and using temperature as a parameter is determined. The determined elastic coefficient using temperature as a parameter and a thermal expansion coefficient are set as physical property conditions of the elastic adhesive. The behavior of the panel component is analyzed in a temperature change condition in which a temperature change is applied to the joint structure in a previously-set temperature range.

公开(公告)号：US20240408661A1

公开(公告)日：2024-12-12

申请号：US18690451

申请日：2022-06-17

Applicant: JFE STEEL CORPORATION

Inventor： Yuta KARIYAZAKI ,  Kentaro SATO

IPC: B21D22/02 ,  G06F30/23 ,  G06F113/22

Abstract: A press forming fracture determination method determines the presence or absence of fracture occurrence in a portion of the metal sheet in which a deformation path changes from compressive deformation to tensile deformation in press forming on the metal sheet, and includes: a step of deriving a forming limit condition related to fracture occurrence in the metal sheet based on a basic forming test in which a metal sheet is deformed in a deformation path that changes from compressive deformation to tensile deformation and FEM analysis therefor; and a step of determining the presence or absence of fracture occurrence in a portion in which the deformation path changes from compressive deformation to tensile deformation in the press forming on the metal sheet based on the derived forming limit condition.

公开(公告)号：US20230243014A1

公开(公告)日：2023-08-03

申请号：US18011090

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C21D9/46 ,  C22C33/04 ,  C22C38/60 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/34 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C25D3/22 ,  C25D5/36 ,  C25D5/50 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C33/04 ,  C22C38/60 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/34 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C25D3/22 ,  C25D5/36 ,  C25D5/50 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/002 ,  C21D2211/001

Abstract: A galvanized steel sheet includes: a steel sheet having a chemical composition satisfying an equivalent carbon content Ceq of 0.35% or more and less than 0.60%, and a specified steel microstructure; and a galvanized layer on a surface of the steel sheet. The retained austenite has a solute C content of 0.6% or more by mass, and retained austenite grains with an aspect ratio of less than 2.0 constitute 50% or more of all retained austenite grains. In 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction, an L cross section in a 0 to 50 μm region from a surface of the steel sheet on a compression side has a number density of voids of 1000/mm2 or less, and the galvanized steel sheet has a tensile strength of 590 MPa or more.

公开(公告)号：US20240229201A1

公开(公告)日：2024-07-11

申请号：US18010928

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C22C38/04 ,  C21D1/22 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06

CPC classification number: C22C38/04 ,  C21D1/22 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.35% or more and less than 0.60% and a steel microstructure with an area fraction of ferrite: 40% to 85%, tempered martensite and bainite: 10% to 55% in total, retained austenite: 3% to 15%, and ferrite, tempered martensite, bainite, and retained austenite: 93% or more in total. A 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction causes a change of 0.50 or more in (a grain size in a thickness direction)/(a grain size in a direction perpendicular to the thickness) of the tempered martensite in an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side, and the steel sheet has a tensile strength of 590 MPa or more.

公开(公告)号：US20230287553A1

公开(公告)日：2023-09-14

申请号：US18010998

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C23C2/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/00 ,  C23C2/28 ,  C21D9/46

CPC classification number: C23C2/06 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008

Abstract: A galvanized steel sheet including a steel sheet having a chemical composition with an equivalent carbon content Ceq of 0.60% or more and less than 0.85%, and a specified steel microstructure; and a galvanized layer on a surface of the steel sheet. The retained austenite has a solute C content of 0.6% or more by mass, and retained austenite grains with an aspect ratio of less than 2.0 constitute 50% or more of all retained austenite grains. In 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction, an L cross section in a 0- to 50-µm region from a surface of the steel sheet on a compression side has a number density of voids of 1500 /mm2 or less, and the galvanized steel sheet has a tensile strength of 980 MPa or more.

公开(公告)号：US20220291103A1

公开(公告)日：2022-09-15

申请号：US17639627

申请日：2019-09-26

Applicant: JFE STEEL CORPORATION

Inventor： Kentaro SATO ,  Hideaki KOBIKI ,  Takayuki FUTATSUKA ,  Tomohiro SAKAIDANI

IPC: G01N3/307 ,  G01N3/02

Abstract: A translation control and rotation control mechanism support jig for supporting a front end portion of an automobile body part includes a pair of support members, a rotary box having an L-shaped plate, a rotary shaft pin, a compression pin, and a connection plate. The translation control mechanism includes a support plate, a slide guide, an automobile body part securing disk, a translation plate, and a compression pin. Energy-absorbing members are disposed in an arcuate guide groove on a side surface of the rotary box and a linear guide groove arranged on the support plate or the translation plate. A collision punch collides at a test speed with the L-shaped plate of the rotary box. The compression pin deforms the energy-absorbing members to apply torque opposite to a rotation direction and a reaction force in an opposite direction to a translation direction.

公开(公告)号：US20220090989A1

公开(公告)日：2022-03-24

申请号：US17615618

申请日：2020-02-14

Applicant: JFE STEEL CORPORATION

Inventor： Hideaki KOBIKI ,  Kentaro SATO ,  Tsuyoshi SHIOZAKI

IPC: G01M17/007 ,  B62D25/04

Abstract: A side crash test apparatus 1 according to the present invention uses a crash test structure 100 having a center pillar 101, a roof-rail simulated part 103, and a rocker simulated part 105 to perform a side crash test for the center pillar 101, and includes a rocker support 7 having a rocker-rotation braking mechanism 9 that supports each of a front end and a rear end of the rocker simulated part 105, restrains translation of the rocker simulated part 105, and supports the rocker simulated part 105 to be rotatable about an axis thereof and allow braking of the rotation, and the rocker-rotation braking mechanism 9 includes a rocker-rotation support member 19 that rotates together with the rocker simulated part 105, and a rocker-rotation braking plate 25 that brakes the rotation of the rocker-rotation support member 19.

公开(公告)号：US20230296966A1

公开(公告)日：2023-09-21

申请号：US18021055

申请日：2021-07-19

Applicant: JFE STEEL CORPORATION

Inventor： Takashi IWAMA ,  Kentaro SATO ,  Shinji SAKURAI ,  Kayo TOKIEDA ,  Shohei SHINOZUKA ,  Yuhei AKIYAMA ,  Takashi TANIGUCHI

IPC: G03B17/55 ,  G03B17/02 ,  G03B15/03 ,  G03B17/56

CPC classification number: G03B17/55 ,  G03B17/02 ,  G03B15/03 ,  G03B17/561 ,  G03B2215/0575 ,  G03B2215/0503

Abstract: An object is to closely observe, by means of images of a camera having high performance specifications, changes in a structure due to heating or cooling of the structure to a temperature beyond a service temperature limit of the camera having high performance specifications and returning from that temperature to room temperature. A structure observation device includes: a camera case of a rectangular three-dimensional shape, having a glass window of heat-resistant and/or cold-resistant glass on at least one side of the three-dimensional shape; heat insulating walls covering the camera case except for the glass window; a fluid supply port and a fluid discharge port through which a cooling or warming fluid is circulated into; and a camera that is disposed inside the camera case and captures a still image or a moving image through the glass window and externally outputs or internally stores data of the captured image.