公开(公告)号：US20220379409A1

公开(公告)日：2022-12-01

申请号：US17761196

申请日：2020-10-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazuki MATSUDA ,  Shinji KODAMA

IPC: B23K31/02 ,  B23K9/23

Abstract: A welded joint comprising: a pair of steel base materials having a sheet thickness of 0.4 to 4.0 mm, and at least one of which has a tensile strength of 780 MPa or more; and a weld metal that welds the pair of steel base materials, wherein, when the weld metal is seen in plan view, a weld toe of the weld metal has peaks and valleys, an average distance in a direction orthogonal to a weld line direction between a top point of a peak and a bottom point of a valley that are adjacent to one another is 3.0 mm or less, and an average number of a total of peaks and valleys, at which the distance in the direction orthogonal to the weld line direction between the top point of the peak and the bottom point of the valley that are adjacent to one another is 0.1 mm to 3.0 mm, is 2 to 30/15 mm, and an automobile component having the welded joint.

公开(公告)号：US20220220595A1

公开(公告)日：2022-07-14

申请号：US17442803

申请日：2020-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Shinji KODAMA ,  Masahiro MATSUBA

IPC: C22C38/14 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  B23K35/30

Abstract: An automobile undercarriage part of the present invention is an automobile undercarriage part including a welded joint in which a first steel sheet and a second steel sheet are overlapped and a fillet weld is formed between an end surface of the first steel sheet and a surface of the second steel sheet, in which a chemical composition of a weld metal that forms the welded joint contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.20%, Si: more than 0% to less than 0.10%, Mn: 0.3% to 2.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, and the following formula (1) and formula (2) are satisfied. [Al]+[Ti]>0.05   Formula (1) 7×[Mn]−112×[Ti]−30×[Al]≤4.0   Formula (2)

公开(公告)号：US20250144736A1

公开(公告)日：2025-05-08

申请号：US18833901

申请日：2023-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji KODAMA ,  Seiji FURUSAKO ,  Chisato YOSHINAGA ,  Takuya KUWAYAMA ,  Kengo TAKEDA ,  Takuya MITSUNOBU ,  Hironori SATO

IPC: B23K11/11 ,  B23K11/31 ,  B23K103/04

Abstract: This spot welding device is a spot welding device for performing spot welding on a plurality of steel sheets overlapping with each other by clamping the plurality of steel sheets between a pair of electrodes, and energizing the plurality of steel sheets while pressurizing the plurality of steel sheets, in which a speed at which the pair of electrodes approach each other is limited to at least 12.0 mm/s or slower during a period from start of the energization to end of the energization.

公开(公告)号：US20240250336A1

公开(公告)日：2024-07-25

申请号：US18289594

申请日：2022-04-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji KODAMA ,  Sho MATSUI ,  Kyohei MIYAKE ,  Yutaka MIKAZUKI ,  Takashi OKE ,  Katsunari NORITA

IPC: H01M10/6556 ,  B21D22/02 ,  B23K1/00 ,  B23K1/005 ,  H01M10/613 ,  H01M10/651

CPC classification number: H01M10/6556 ,  B21D22/02 ,  B23K1/0016 ,  B23K1/0056 ,  H01M10/613 ,  H01M10/651

Abstract: A cooling structure according to an aspect of the present invention includes a press forming member including a groove part and a bank part provided around the groove part, a flow path upper lid positioned on a position covering the groove part of the press forming member, and a joint portion which joins opposing surfaces of the flow path upper lid and the bank part to form a flow path through which a cooling liquid is capable of flowing, in which the press forming member and the flow path upper lid are plated steel sheets having a base steel sheet and having an Al-based plating having a film thickness of 10.0 μm or more or a Zn-based plating having a film thickness of 5.0 μm or more, in which a sheet thickness of the plated steel sheets 0.3 mm to 1.2 mm, the joint portion is formed of a joining metal brazing the base steel sheets of the press forming member and the flow path upper lid, and a partial flow path interval is 20 mm or less and a joining width is 3 mm or more.

公开(公告)号：US20210086313A1

公开(公告)日：2021-03-25

申请号：US16759784

申请日：2018-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji KODAMA ,  Masahiro MATSUBA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Kenichiro OTSUKA ,  Tetsuro NOSE ,  Tomokatsu IWAKAMI ,  Kazutaka MARUYAMA

IPC: B23K35/30 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K35/02 ,  B23K9/00

Abstract: This wire for gas-shielded arc welding is a wire for joining a plurality of thin steel sheets by gas-shielded arc welding, the wire including, in mass %, with respect to a total mass of the wire: C: 0.06 to 0.15%; Si: more than 0 to 0.18%; Mn: 0.3 to 2.2%; Ti: 0.06 to 0.30%; Al: 0.001 to 0.30%; and B: 0.0030 to 0.0100%, in which Si, Mn, Ti, and Al satisfy Expressions (1) and (2). Si×Mn≤0.30  Expression (1) (Si+Mn/5)/(Ti+Al)≤3.0  Expression (2)

公开(公告)号：US20240243386A1

公开(公告)日：2024-07-18

申请号：US18289564

申请日：2022-04-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Sho MATSUI ,  Shinji KODAMA ,  Kyohei MIYAKE ,  Yutaka MIKAZUKI ,  Takashi OKE ,  Katsunari NORITA

IPC: H01M10/6556 ,  H01M10/04 ,  H01M10/613 ,  H01M10/651 ,  H01M10/6568

CPC classification number: H01M10/6556 ,  H01M10/0481 ,  H01M10/651 ,  H01M10/6568 ,  H01M10/613

Abstract: A cooling structure according to an aspect of the present invention includes a press forming member including a groove part and a bank part provided around the groove part, a flow path upper lid which is a flat sheet overlapped at a position covering the groove part of the press forming member and forms a flat cooling surface, and a laser weld which joins opposing surfaces of the flow path upper lid and the bank part to form a flow path through which a cooling liquid is capable of flowing, in which the press forming member and the flow path upper lid are plated steel sheets including a base steel sheet and an Al-based plating, the flow path has a parallel flow path portion in which a plurality of partial flow paths extending along a first direction are arranged in a second direction orthogonal to the first direction, and in the parallel flow path portion, an interval between adjacent partial flow paths is 20 mm or less.

公开(公告)号：US20220154319A1

公开(公告)日：2022-05-19

申请号：US17441578

申请日：2020-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Shinji KODAMA ,  Masahiro MATSUBA

IPC: C22C38/58 ,  B62D27/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/54 ,  C22C38/48 ,  C22C38/50 ,  C22C38/46 ,  B23K35/30

Abstract: An automobile undercarriage part of the present invention has a welded joint formed by base steel plate, wherein the chemical composition of a weld metal contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.30%, Si: 0.10% to less than 1.0%, Mn: 1.2% to 3.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, the following formula (1A), formula (1B), formula (2), and formula (3) are satisfied, and slag in a toe portion of the fillet weld satisfies a formula (4). [Al]+[Ti]>0.05  Formula (1A) [Ti]/[Al]>0.9  Formula(1B) 7×[Si]+7×[Mn]−112×[Ti]−30×[Al]≤12  Formula (2) 2.0 [Si content on slag surface]  Formula (4).

公开(公告)号：US20200378420A1

公开(公告)日：2020-12-03

申请号：US16636788

申请日：2018-08-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazuki MATSUDA ,  Shinji KODAMA ,  Kotaro WATANABE ,  Masatoshi TOKUNAGA

IPC: F16B5/08

Abstract: A lap fillet arc welded joint includes: a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet. When: a toe angle of the weld metal is defined as β; the total number of concave portions present on the surface of the weld metal included a range of 0.4 mm or less from a fusion boundary is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 μm or more is defined as NB, the weld metal satisfies the following conditional expressions (1) and (2) at the same time. 0°

公开(公告)号：US20250059635A1

公开(公告)日：2025-02-20

申请号：US18725054

申请日：2022-12-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazuki MATSUDA ,  Shinji KODAMA ,  Masahiro MATSUBA ,  Yoshinari ISHIDA

IPC: C22C38/04 ,  B23K35/30 ,  C22C38/00 ,  C22C38/02

Abstract: An arc weld metal according to an aspect of the present invention contains, in a unit mass %, 0.10% or more and 0.30% or less of C, 0.30% or more and 1.00% or less of Si, 1.30% or more and 3.00% or less of Mn, 0.0500% or less of P, 0.0100% or less of S, 0.01% or less of N, and 0.02% or more and 0.07% or less of O, a remainder including iron and impurities, and the residual austenite volume percentage being 3.0% or more and 16.0% or less, in a unit mass %.

公开(公告)号：US20190388995A1

公开(公告)日：2019-12-26

申请号：US16489144

申请日：2018-02-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinji KODAMA ,  Kazuki MATSUDA ,  Yoshinari ISHIDA

IPC: B23K9/23 ,  B23K9/02 ,  B23K35/30

Abstract: The present invention relates to a fillet welded joint and a manufacturing method thereof, and addresses the problem of providing a fillet welded joint having excellent weld fatigue strength while suppressing low temperature cracking. In a fillet welded joint according to the present invention, a tensile strength of a base material is 980 MPa or more, a carbon equivalent is 0.36 or more and 0.60 or less, a tensile strength [MPa] is 1950 times or more of the carbon equivalent [wt%], an average carbon equivalent of weld metal is 0.45 or more and 0.65 or less, and at a prescribed position below a surface of a weld toe, a Vickers hardness HVbond at a boundary between the weld metal and a heat affected zone, an average value HVwmt of theVickers hardness of the weld metal in a position 0.1 mm or more and 0.3 mm or less to the weld metal side of the boundary, and an average value HVhaz of the Vickers hardness of the heat affected zone in a position 0.1 mm or more and 0.3 mm or less to the heat affected zone side of the boundary satisfy HVbond≤HVwmt, HVbond≥HVhaz−50, and HVhaz≤350.