公开(公告)号：US11951526B2

公开(公告)日：2024-04-09

申请号：US17464768

申请日：2021-09-02

Applicant: TOPRE CORPORATION

Inventor： Masaya Fujimoto

IPC: B21D22/02 ,  B21D53/88 ,  B30B15/02

CPC classification number: B21D53/88 ,  B21D22/02 ,  B30B15/02

Abstract: A pressing step of forming a press-formed product includes: a primary formed product forming step of forming a primary formed product having an intermediate wall portion which will be a part of a convex-side wall part, and an intermediate flange continuous with the intermediate wall portion; and a secondary formed product forming step of forming a secondary formed product having a wall part which will be the convex-side wall part by extending at least a portion, on the intermediate wall portion side, of the intermediate flange formed in the primary formed product forming step such that the portion is aligned with the intermediate wall portion. In the primary formed product forming step, the intermediate wall portion is formed such that a boundary valley line between the intermediate wall portion and the intermediate flange is deeper at a large-curvature section than at a small-curvature section.

公开(公告)号：US11931786B2

公开(公告)日：2024-03-19

申请号：US18096442

申请日：2023-01-12

Applicant: Hyundai Steel Company

Inventor： Je Youl Kong

IPC: B21D22/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32

CPC classification number: B21D22/022 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32

Abstract: A method of manufacturing a hot-stamped part includes: inserting a blank into a heating furnace including a plurality of sections with different temperature ranges; step heating the blank in multiple stages; and soaking the blank at a temperature of about Ac3 to about 1,000° C., wherein in the step of heating the blank, a temperature condition in the heating furnace satisfies the following equation: 0

公开(公告)号：US11913117B2

公开(公告)日：2024-02-27

申请号：US18173392

申请日：2023-02-23

Applicant: Hyundai Steel Company

Inventor： Hye Jin Kim ,  Kyu Yeon Hwang ,  Hyun Yeong Jung ,  Jin Ho Lee ,  Seung Pill Jung

IPC: B32B15/01 ,  C23C2/02 ,  B21D22/02 ,  B21D37/16 ,  C21D1/673 ,  C22C38/00 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  F27B9/02

CPC classification number: C23C2/02 ,  B21D22/022 ,  B21D37/16 ,  B32B15/012 ,  C21D1/673 ,  C22C38/00 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  F27B9/028

Abstract: Disclosed is a hot-stamping component, which includes a base steel plate; and a plated layer on the base steel plate and including a first layer, a second layer, and an intermetallic compound portion having an island shape in the second layer, wherein the first layer and the second layer are sequentially stacked, and an area fraction of the intermetallic compound portion with respect to the second layer is an amount of 20% to 60%.

公开(公告)号：US11911816B2

公开(公告)日：2024-02-27

申请号：US17422276

申请日：2019-10-17

Applicant: JFE STEEL CORPORATION

Inventor： Masaki Urabe

IPC: B21D22/02 ,  G06F30/23 ,  G06F30/10 ,  B21D22/20

CPC classification number: B21D22/02 ,  B21D22/20 ,  G06F30/10 ,  G06F30/23

Abstract: A method for identifying a variation factor portion of a springback amount, including: performing press forming analysis under first press forming conditions, and calculating a residual stress distribution in a press formed part; performing springback analysis on the press formed part, and calculating a first springback amount; performing press forming analysis under second press forming conditions, and calculating a residual stress distribution in the press formed part; replacing a value of residual stress in a partial area of the residual stress distribution; performing springback analysis on the press formed part for which the value of the residual stress has been replaced, and calculating a second springback amount; obtaining a difference between the second springback amount and the first springback amount; and identifying a portion in the press formed part that is a factor for variation in springback amount of the press formed part based on the obtained difference.

公开(公告)号：US11878488B2

公开(公告)日：2024-01-23

申请号：US17791696

申请日：2020-03-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Akihiro Sengoku ,  Kojiro Akiba ,  Satoshi Kato

IPC: B32B15/01 ,  C22C18/00 ,  C23C28/00 ,  B21D22/20 ,  C25D5/36 ,  C23C2/06 ,  C23C30/00 ,  B21D22/02 ,  B32B15/18 ,  B32B15/04 ,  C23C28/02 ,  C23C2/30 ,  C23C2/28 ,  C23C2/04 ,  C23C2/26

CPC classification number: B32B15/013 ,  B21D22/022 ,  B21D22/20 ,  B32B15/011 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C22C18/00 ,  C23C2/04 ,  C23C2/06 ,  C23C2/26 ,  C23C2/285 ,  C23C2/30 ,  C23C28/023 ,  C23C28/025 ,  C23C28/321 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  C25D5/36 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12972

Abstract: A hot stamped component, includes: a base material; and a Zn-based plating layer provided in contact with the base material as an upper layer of the base material and containing Zn and Ni. A region of the Zn-based plating layer on a base material side is a Fe—Zn solid solution containing Ni, and two or more twins exist in 10 crystal grains of the Fe—Zn solid solution containing Ni adjacent to an interface between the base material and the Zn-based plating layer.

公开(公告)号：US11845121B2

公开(公告)日：2023-12-19

申请号：US17383103

申请日：2021-07-22

Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.

Inventor： Masayuki Saika ,  Masayuki Ishizuka ,  Norieda Ueno ,  Kimihiro Nogiwa ,  Akihiro Ide

IPC: B21D22/02 ,  B21D22/06 ,  B21D19/08 ,  B21D26/047 ,  B21D37/16 ,  B21D26/035 ,  B21D13/02

CPC classification number: B21D22/025 ,  B21D22/022 ,  B21D22/06

Abstract: A metal pipe forming method includes: disposing a metal pipe material having a hollow shape between a pair of dies; and forming a metal pipe including a pipe portion and a flange portion by expanding the metal pipe material by supplying a fluid and bringing the metal pipe material into contact with the pair of dies. In the forming of the metal pipe, a gap which is positioned between a pair of inner surfaces of the flange portion and communicates with an internal space of the pipe portion is formed, and the flange portion is provided with a through-hole connected to the gap.

公开(公告)号：US11827994B2

公开(公告)日：2023-11-28

申请号：US17606974

申请日：2020-05-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Akinobu Kobayashi ,  Takehiro Takahashi ,  Yasuaki Kawamura

IPC: C25D3/12 ,  B21D22/02 ,  C25D3/56 ,  C25D5/36

CPC classification number: C25D3/12 ,  B21D22/022 ,  C25D3/56 ,  C25D5/36 ,  Y10T428/12611

Abstract: The present invention relates to a hot stamped body comprising a steel sheet and a plating layer formed on at least one surface of the steel sheet, wherein the plating layer is comprised of a ZnO region present on a surface side of the plating layer and having an oxygen concentration of 10 mass % or more and an Ni—Fe—Zn alloy region present on a steel sheet side of the plating layer and having an oxygen concentration of less than 10 mass %, and an average concentration of a total of Fe, Mn and Si in the ZnO region is more than 0 mass % and less than 5 mass %.

公开(公告)号：US20230347444A1

公开(公告)日：2023-11-02

申请号：US18206979

申请日：2023-06-07

Applicant: HYUNDAI MOTOR COMPANY ,  KIA CORPORATION

Inventor： Chang Wook Lee ,  Yeon Jung Hwang

IPC: C22C38/02 ,  C22C38/00 ,  B23K26/21 ,  C22C38/32 ,  C21D6/00 ,  C22C38/38 ,  C21D9/46 ,  B21D22/02

CPC classification number: B23K26/21 ,  B21D22/022 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/32 ,  C22C38/38 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A hot-stamped article and a method of manufacturing same use a tailor welded blank (TWB) method capable of controlling the microstructure of a weld portion to prevent fracture of the weld portion. The method includes: preparing a first sheet and a second sheet having different upper austenite transformation temperatures (A3 temperatures); welding the first sheet and the second sheet using a TWB method to prepare a welded sheet obtained as a result of the first sheet and the second sheet being welded to each other via a weld portion; and hot-stamping the welded sheet heated within a temperature range between an A3 temperature of the first sheet and an A3 temperature of the second sheet.

公开(公告)号：US20230332262A1

公开(公告)日：2023-10-19

申请号：US18210816

申请日：2023-06-16

Applicant: ThyssenKrupp Steel Europe AG ,  ThyssenKrupp AG

Inventor： Janko Banik ,  Maria Köyer ,  Dirk Rosenstock ,  Manuela Ruthenberg

IPC: C21D9/48 ,  B21D22/02 ,  C21D6/00 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/48 ,  B21D22/022 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0405 ,  C21D8/0426 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: The present invention relates to a method for producing a steel component comprising a substrate and a coating, to a corresponding sleet component and to the use thereof in the automotive sector.

公开(公告)号：US11788166B2

公开(公告)日：2023-10-17

申请号：US18114387

申请日：2023-02-27

Applicant: POSCO Co., Ltd

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: C21D9/46 ,  B21B3/02 ,  B21D22/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/46 ,  B21B3/02 ,  B21D22/022 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54 ,  C21D2211/003 ,  C21D2211/005

Abstract: An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).