公开(公告)号：US20250066891A1

公开(公告)日：2025-02-27

申请号：US18724764

申请日：2023-02-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki KAMITANI ,  Yuji ARAI ,  Jin KAWASAKI ,  Keiichi KONDO

IPC: C22C38/32 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28

Abstract: A steel material according to the present disclosure consists of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.05 to 0.30%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr: 0.30 to 1.10%, Mo: 0.40 to 2.00%, Ti: 0.002 to 0.020%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, N: 0.0100% or less, and O: less than 0.0040%, with the balance being Fe and impurities, and has a yield strength of 862 MPa or more. In the steel material, a number density of Si oxides which have a major axis of 5.0 μm or more is 5/100 mm2 or less, and in a case where the yield strength is 931 MPa or more, the number density of the Si oxides is 5/200 mm2 or less.

公开(公告)号：US20250065835A1

公开(公告)日：2025-02-27

申请号：US18723802

申请日：2023-01-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro SAITO ,  Yasuhiro ITO ,  Hiroshi YOSHIDA ,  Junichiro SUZUKI ,  Susumu YUASA

IPC: B60R19/18

Abstract: A top sheet (210), two walls (221, 222), and two ridge portions (231, 232) are provided, tensile strengths of the top sheet (210) and the walls (221, 222) are 1470 MPa or more, each of the two ridge portions (231, 232) extend between the top sheet (210) and the walls (221, 222), in a longitudinal direction of the top sheet (210), and a cross section of a center portion in the longitudinal direction is an open cross section having a groove shape. In the cross section, the top sheet (210) includes a central groove part (260) extending in the longitudinal direction at a center of a width and a small groove part between the central groove part (260) and each of the ridge portions (231, 232), and a depth of the groove part at the center is 15 times or more and 25 times or less a sheet thickness of the top sheet (210), a depth of each of the small groove parts (240, 250) is 2 times or more and 13 times or less the sheet thickness, and an interval between each of the small groove parts (240, 250) and the ridge portion (231, 232) is 30 times or less the sheet thickness.

公开(公告)号：US20250061243A1

公开(公告)日：2025-02-20

申请号：US18724149

申请日：2023-02-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Rei HONMA

IPC: G06F30/17 ,  G06F30/20

Abstract: A core design device (100) acquires an application parameter including a parameter indicating an application method of a deformation pattern (310a, 310b). The core device (100) changes a shape of a design target element by applying the deformation pattern (310a, 310b) to the design target element according to the application method included in the application parameter. The core design apparatus (100) determines a shape of a core based on a value indicating a characteristic of a device when the device including the core in which the shape of the design target element has been changed is operated.

公开(公告)号：US12221669B2

公开(公告)日：2025-02-11

申请号：US18709045

申请日：2022-09-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Kentarou Hirata ,  Masaharu Oka ,  Masahito Sakaki ,  Mamoru Saito

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: A hot-rolled steel sheet which has excellent rigidity along with high strength, excellent workability, and excellent LME resistance is provided. A hot-rolled steel sheet of the present embodiment consists of, in mass %, C: 0.040 to 0.120%, Si: 0.01 to 0.60%, Mn: 0.50 to 1.50%, P: 0.025% or less, S: 0.010% or less, Al: 0.010 to 0.070%, N: 0.0070% or less, Ti: 0.055 to 0.200%, and B: 0.0010 to 0.0050%, with the balance being Fe and impurities. In the microstructure of the hot-rolled steel sheet, an area fraction of bainitic ferrite is 85% or more and the dislocation density is 8.0×1013 to 100.0×1013/m2. The average equivalent circular diameter of Ti carbides in the hot-rolled steel sheet is 10 nm or less, and the average equivalent circular diameter of grains of the bainitic ferrite is 15 μm or less.

公开(公告)号：US12221664B2

公开(公告)日：2025-02-11

申请号：US17292984

申请日：2019-11-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Takayama ,  Hiroshi Harada ,  Kenji Yamada ,  Masashi Sakamoto

IPC: C21D9/46 ,  B21B1/46 ,  B22D11/128 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: Using an apparatus for manufacturing a thin steel sheet including the followings which are arranged in order: a continuous casting machine (1) for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold; a holding furnace (2) that is configured to maintain a temperature of a cast slab (10) and/or heats the cast slab (10); and a rolling stand (3) by which finish rolling is performed, the casting speed of the thin slab is set to 4 to 7 m/min, the slab (10) is reduced at a rolling reduction of 30% or more by the reduction roll (4) after solidification is completed and when a center temperature of the slab is 1300° C. or higher, and the slab (10) is held at a temperature of 1150° C. or higher and 1300° C. or lower for five minutes or longer in the holding furnace (2).

公开(公告)号：US12215411B2

公开(公告)日：2025-02-04

申请号：US18348163

申请日：2023-07-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro Tabata

IPC: C22C38/54 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

Abstract: A coated steel member includes: a steel sheet substrate containing, as a chemical composition, by mass %, C: 0.25% to 0.65%, Si: 0.10% to 1.00%, Mn: 0.30% to 1.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, Ti: 0.010% to 0.100%, B: 0.0005% to 0.0100%, Nb: 0.02% to 0.10%, Mo: 0.10% to 1.00%, Cu: 0.15% to 1.00%, and Ni: 0.05% to 0.25%; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe. The maximum Cu content in a range from the surface to a depth of 5.0 μm is 150% or more of the Cu content of the steel sheet substrate.

公开(公告)号：US12215402B2

公开(公告)日：2025-02-04

申请号：US17784901

申请日：2020-12-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Genki Abukawa ,  Masafumi Azuma ,  Eisaku Sakurada ,  Shohei Yabu

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38

Abstract: This hot-rolled steel sheet has a predetermined chemical composition, a microstructure includes 80% or more of tempered martensite by a volume percentage and a remainder consisting of one or more of ferrite, pearlite, bainite, fresh martensite, and residual austenite, the tempered martensite includes 5×109 pieces/mm3 or more of precipitates containing Ti and having an equivalent circle diameter of 5 nm or less per unit volume, in a surface layer region that is a range from a surface to a 1/10 position of a sheet thickness, a sum of an average pole density of a crystal orientation group consisting of {211} to {111} and a pole density in a crystal orientation of {110} is 6.0 or less, and a tensile strength is 980 MPa or more.

公开(公告)号：US20250035139A1

公开(公告)日：2025-01-30

申请号：US18716435

申请日：2023-01-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Masaaki URANAKA ,  Takuya MITSUNOBU ,  Masahiro MATSUBA ,  Toyomitsu NAKAMURA

IPC: F16B5/08

Abstract: To further improve corrosion resistance in the vicinity of a toe.
A welded joint according to the present invention includes: a first steel sheet and a second steel sheet; and a weld bead zone formed by arc welding or laser welding, wherein at least one of the first steel sheet or the second steel sheet has a plating layer formed by a predetermined component and an oxide layer located on the plating layer in a non-heat-affected zone, and in a region from a position orthogonal to an extension direction of the weld bead zone from the toe and 1 mm in a direction separating from the toe to a position orthogonal to the extension direction from the toe and 2 mm in the direction separating from the toe, the plating layer has at least one of a η-Zn phase, MgZn2 phase, Mg2Zn3 phase, or MgZn phase as a metal Zn-containing phase having a circle-equivalent diameter of 0.5 μm or more, and when each of the metal Zn-containing phases is projected onto an interface between a base iron and the plating layer, a total sum of lengths of the metal Zn-containing phases in the direction orthogonal to the extension direction, Lt, is 10% or more of a length of the interface, Le.

公开(公告)号：US20250027178A1

公开(公告)日：2025-01-23

申请号：US18714122

申请日：2022-11-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Shoji USHIO ,  Kimihito SUZUKI ,  Takashi IIJIMA

IPC: C21B13/00

Abstract: A facility for producing reduced iron includes: a granulation apparatus that granulates raw material fine powder that contains iron and has a median diameter of 50 μm or less into granular powder in a fluidized bed formed by fluidizing medium particles that do not thermally decompose during fluidization; and a reduction apparatus that reduces at least the granular powder in the fluidized bed formed by fluidizing the granular powder.

公开(公告)号：US20250026968A1

公开(公告)日：2025-01-23

申请号：US18714379

申请日：2022-11-29

Applicant: TOAGOSEI CO., LTD. ,  NIPPON STEEL CORPORATION

Inventor： Yoshiaki IWASE ,  Mikako ARAI ,  Makoto NIWA ,  Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Yoshiaki NATORI

IPC: C09J133/10 ,  C09J11/06

Abstract: An anaerobic curing adhesive composition of the disclosure contains a compound having an aromatic ring and an ethylenically unsaturated group, a polymer or an oligomer having two or more (meth)acryloyl groups in one molecule, a radical polymerization initiator, and an anaerobic curing catalyst.