公开(公告)号：US20250033117A1

公开(公告)日：2025-01-30

申请号：US18778836

申请日：2024-07-19

Applicant: Hyun Ki KANG ,  Sam Sub BYUN ,  Jong Yeob LEE ,  Jae Wha SON

Inventor： Hyun Ki KANG ,  Sam Sub BYUN ,  Jong Yeob LEE ,  Jae Wha SON

IPC: B22F7/06 ,  B22F10/28 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  B33Y80/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42

Abstract: The present invention relates to a method for repairing a tooth of a labyrinth seal using 3D printing, the labyrinth seal consisting of an arch-shaped body and teeth protruding from the inner surface as one surface of the arch-shaped body, the method including the steps of: removing a damaged tooth from the body of the labyrinth seal; depositing a tooth onto the body by means of the 3D printing; and adjusting the surface roughness of the deposited tooth by means of machining.

公开(公告)号：US12209299B2

公开(公告)日：2025-01-28

申请号：US17442744

申请日：2020-03-26

Applicant: JFE Steel Corporation

Inventor： Yoshihiko Ono ,  Yasushi Kitani ,  Hiroyuki Akimoto ,  Yoichiro Matsui

IPC: C22C38/00 ,  C21D1/25 ,  C21D1/76 ,  C21D8/02 ,  C21D8/04 ,  C21D9/48 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/58 ,  C22C38/60 ,  C23C2/28

Abstract: The steel sheet has a steel microstructure containing ferrite: 6% to 90% by area, a microstructure composed of one or more of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ: 10% to 94% by area in total, and retained γ: 3% to 20% by volume, a ratio (SUB/S2nd)×100(%) of an area ratio SUB of an upper bainite with a width in the range of 0.8 to 7 μm, a length in the range of 2 to 15 μm, and an aspect ratio of 2.2 or more in contact with retained γUB with a grain width in the range of 0.17 to 0.80 μm and an aspect ratio in the range of 4 to 25 to an area ratio S2nd of the microstructure composed of one or more of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ ranges from 2.0% to 15%.

公开(公告)号：US20250027181A1

公开(公告)日：2025-01-23

申请号：US18714912

申请日：2022-12-06

Applicant: POSCO CO., LTD

Inventor： Young-Roc Im

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/40

Abstract: The present disclosure relates to a cold rolled steel sheet having excellent weldability, strength and formability and a method of manufacturing the same.
An aspect of the present disclosure is to provide a cold-rolled steel sheet having excellent weldability, strength, and formability, and a method of manufacturing the same.
As set forth above, according to an aspect of the present disclosure, a cold-rolled steel sheet having excellent weldability, strength, and formability and a method of manufacturing the same may be provided.

公开(公告)号：US12203155B2

公开(公告)日：2025-01-21

申请号：US17294531

申请日：2019-11-05

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

IPC: C22C38/12 ,  C21D8/02 ,  C21D9/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A steel sheet for cans has a chemical composition containing, in mass percent, C: 0.085% to 0.130%, Si: 0.04% or less, Mn: 0.10% to 0.60%, P: 0.02% or less, S: more than 0.010% to 0.020%, Al: 0.02% to 0.10%, N: 0.0005% to 0.0040%, Nb: 0.007% to 0.030%, and B: 0.0010% to 0.0050%, B/N that is the ratio of the content (mass percent) of B to the content (mass percent) of N being 0.80 or more, the remainder being Fe and inevitable impurities, and a ferrite microstructure containing 1.0% or more pearlite in terms of area fraction. The steel sheet for cans has a yield stress of 500 MPa or more, a tensile strength of 550 MPa or more, a uniform elongation of 10% or more, and a yield elongation of 5.0% or less.

公开(公告)号：US12203149B2

公开(公告)日：2025-01-21

申请号：US17284787

申请日：2019-06-25

Applicant: JFE STEEL CORPORATION

Inventor： Masafumi Tada

IPC: C21D9/00 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: Disclosed is a non-heat-treated steel that has low deformation resistance during cold forging in bolt head forming and excellent product yield, and that can be manufactured without the need to perform heat treatment for controlling strength variation. The disclosed steel has a chemical composition containing C: 0.18-0.24%, Si: 0.10-0.22%, Mn: 0.60-1.00%, Al: 0.010-0.050%, Cr: 0.65-0.95%, Ti: 0.010-0.050%, B: 0.0015-0.0050%, N: 0.0050-0.0100%, P: 0.025% or less inclusive of 0, S: 0.025% or less inclusive of 0, Cu: 0.20% or less inclusive of 0, and Ni: 0.30% or less inclusive of 0, in a range satisfying: 0.45≤C+Si/24+Mn/6+Ni/40+Cr/5≤0.60 and N≤0.519Al+0.292Ti, with the balance being Fe and inevitable impurities; and a microstructure in which bainite is present in an area ratio of 95% or more, where the microstructure contains prior austenite grains with a grain size number of 6 or more, and strength variation is 100 MPa or less.

公开(公告)号：US20250019808A1

公开(公告)日：2025-01-16

申请号：US18714459

申请日：2022-12-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Mutsumi SAKAKIBARA ,  Hiroshi SHUTO ,  Hiroshi TANEI

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

Abstract: This hot-rolled steel sheet has a microstructure comprising bainite: 55 to 95%, retained austenite: 5 to 30%, fresh martensite: 5% or less, ferrite: 5% or less, and pearlite: 5% or less, in a texture at a region from a surface to a ⅛ thickness depth from the surface, a pole density of {110} orientation is 3.0 or less, and an arithmetic average roughness Ra of the surface after pickling is less than 1.2 μm.

公开(公告)号：US12195819B2

公开(公告)日：2025-01-14

申请号：US17632566

申请日：2020-07-16

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Takeshi Yokota

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28 ,  C23G1/08

Abstract: The high-strength thin steel sheet has a chemical composition containing C, Si, Mn, P, S, Al, and N, with the balance being Fe and inevitable impurities, and a complex structure containing ferrite, tempered martensite, and bainite, where a volume fraction of a total of tempered martensite and bainite containing five or more carbides with a particle size of 0.1 μm or more and 1.0 μm or less in a grain with respect to a total of the tempered martensite and the bainite is 85% or more, and C mass % and Mn mass % in a region of 20 μm or less in a thickness direction from a surface of the steel sheet are each 20% or less with respect to C mass % and Mn mass % in a region of 100 μm or more and 200 μm or less from the surface of the steel sheet.

公开(公告)号：US12195817B2

公开(公告)日：2025-01-14

申请号：US17420024

申请日：2019-12-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeshi Toyoda ,  Hitoshi Nikaido ,  Kohei Nakada ,  Yui Yamashita ,  Kazuki Matsuda

IPC: C21D9/46 ,  B23K9/16 ,  C21D8/02 ,  C21D9/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: Hot-rolled steel sheet having a chemical composition including, in mass %, C: 0.02 to 0.20%, Si: 0.01 to 1.50%, Mn: 0.10 to 3.00%, P: 0.10% or less, S: 0.010% or less, Al: 0.005 to 0.100%, Ti: 0.02 to 0.20%, N: 0.001 to 0.010%, Cu: 0 to 0.50%, Ni: 0 to 0.50%, Cr: 0 to 1.00%, Mo: 0 to 0.40%, Nb: 0 to 0.060%, V: 0 to 1.00%, B: 0 to 0.0100%, Ca: 0 to 0.0050%, O: 0.0100% or less, and the balance: Fe and impurities; in which: a steel micro-structure includes, in area %, ferrite: 60 to 80%, and a total of ferrite and bainite: 90% or more; an average of the crystal grain size of ferrite and bainite is 7.0 μm or less, a standard deviation of the crystal grain size is 2.0 μm or less; and a standard deviation of a diameter of Ti carbo-nitrides is 10 nm or less.

公开(公告)号：US20250012382A1

公开(公告)日：2025-01-09

申请号：US18712635

申请日：2022-11-24

Applicant: Baoshan Iron & Steel Co., Ltd.

Inventor： Wen Sun ,  Zhan Gao ,  Yannan Ma ,  Hongzhi Zuo

IPC: F16L9/02 ,  C21D1/25 ,  C21D1/30 ,  C21D6/00 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

Abstract: Disclosed is a steel pipe for oil cylinder and a manufacturing method therefor. In addition to 90 wt % or more of Fe and inevitable impurities, the steel pipe for oil cylinder further comprises the following chemical elements in wt %: C: 0.16-0.3%, Si: 0.15-0.5%, Mn: 1.2-1.8%, Nb: 0.02-0.04%, Mo: 0.1-0.2%, and optionally Ti: 0.015-0.03% and B: 0.0015-0.0035%. According to the present invention, after tension reduction and quenching of the steel pipe, different stepped cooling processes are adopted respectively, the distribution of phase change and thermal stress in the whole wall thickness of the steel pipe for oil cylinder is controlled by increasing the rigidity and straightness level of the steel pipe, the distribution of ferrite in the microstructure of the steel pipe for oil cylinder is controlled, the residual stress of the steel pipe for oil cylinder is effectively reduced, cracking of the inner wall is avoided, and therefore the steel pipe for oil cylinder with high strength and low residual stress is obtained. The steel pipe for oil cylinder has a yield strength of greater than or equal to 600 MPa, a tensile strength of greater than or equal to 730 MPa, and a residual stress of less than or equal to 50 MPa.

公开(公告)号：US20250010365A1

公开(公告)日：2025-01-09

申请号：US18705207

申请日：2023-05-01

Applicant: Niterra Co., Ltd.

Inventor： Yoichi ITO ,  Kenichi SHIOTSU ,  Hisashi KOZUKA

IPC: B22F1/16 ,  B22F1/05 ,  B22F1/142 ,  B22F1/145 ,  B22F3/02 ,  B22F3/24 ,  B22F5/10 ,  C22C38/02 ,  H01F1/24 ,  H02K1/02

Abstract: An insulation-coated soft magnetic metal powder (1) includes: soft magnetic metal particles (2) having an average equivalent circle diameter of 10 μm to 100 μm; and an insulation layer (3) formed on a surface of each of the soft magnetic metal particles (2). The insulation layer (3) contains an oxide including Zr element. In the insulation-coated soft magnetic metal powder (1), when the oxide is measured at 25° C. by XRD, a strongest peak is a cubic peak or a tetragonal peak, and an intensity of a monoclinic peak is not greater than one-tenth of an intensity of the strongest peak.