公开(公告)号：US20230241662A1

公开(公告)日：2023-08-03

申请号：US18014427

申请日：2021-07-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yasuhiro ITO ,  Toru YONEBAYASHI

IPC: B21D19/08

CPC classification number: B21D19/08

Abstract: A burring processing method including increasing a diameter of a prepared hole provided in a metal component and bending a part of the metal component to form a burring processed portion (110) including an upright portion (120) and a curved portion (130), wherein in a cross-section that passes through an axis (cb) of the burring processed portion (110) and is parallel to the axis (cb) of the buffing processed portion (110), a cross-sectional shape of the curved portion (130) on an inner surface of the curved portion consists of a curve, and a length of the curved portion (130) in a direction perpendicular to the axis (cb) of the burring processed portion (110) is at least 1.2 times a height of the curved portion in a direction parallel to the axis (cb) of the burring processed portion (110).

公开(公告)号：US20220186333A1

公开(公告)日：2022-06-16

申请号：US17430651

申请日：2020-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Masafumi AZUMA ,  Eisaku SAKURADA ,  Genki ABUKAWA ,  Kenichiro OTSUKA ,  Takeshi TOYODA

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/46 ,  C22C38/54 ,  C21D8/02 ,  B21C47/02 ,  C23G1/00 ,  C23C2/40

Abstract: A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 95% or more of tempered martensite and bainite in total, and a remainder consists of ferrite and pearlite, the microstructure contains 5.0×109 pieces/mm or more of, per unit volume, precipitate having an equivalent circle diameter of 5.0 nm or less and containing Ti, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 μm from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, a tensile strength is 980 MPa or more, and a product of the tensile strength and elongation is 12,000 MPa×% or more.

公开(公告)号：US20200031208A1

公开(公告)日：2020-01-30

申请号：US16494915

申请日：2018-04-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA

IPC: B60J5/00 ,  B60R19/04

Abstract: A structural member for an automobile to be disclosed includes a press-formed product formed from one steel sheet and a reinforcing member fixed to the press-formed product. The press-formed product includes two vertical wall portions and a top plate portion linking the two vertical wall portions. The reinforcing member is a member which has an L-shaped cross section and includes a first plate-like portion and a second plate-like portion. The first plate-like portion is fixed to one of the vertical wall portions such that the second plate-like portion protrudes toward an outward direction from the vertical wall portion side along the top plate portion.

公开(公告)号：US20240123782A1

公开(公告)日：2024-04-18

申请号：US18276621

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Koichi HAMADA ,  Ryo TABATA ,  Ryo URUSHIBATA ,  Yuki KITAHARA

IPC: B60G7/00

CPC classification number: B60G7/001 ,  B60G2206/10

Abstract: A suspension arm includes a main body. The main body includes a curved portion curved along a longitudinal direction and has a closed section. The main body includes an inner side wall, an outer side wall, a first side wall, and a second side wall. The inner side wall corresponds to an inner side of a curve of the curved portion. The outer side wall corresponds to an outer side of the curve of the curved portion. A thickness of the inner side wall is larger than a thickness of the outer side wall. In sectional view of the main body perpendicular to the longitudinal direction, each of a length of the first side wall and a length of the second side wall is longer than each of a length of the inner side wall and a length of the outer side wall.

公开(公告)号：US20240011113A1

公开(公告)日：2024-01-11

申请号：US18026022

申请日：2021-10-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Masafumi AZUMA ,  Yuri TODA ,  Kenichiro OTSUKA

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/84 ,  B21D22/02

CPC classification number: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  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 ,  C21D8/0278 ,  C21D8/0263 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/84 ,  B21D22/022 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

Abstract: A steel sheet for hot stamping includes, as a chemical composition, by mass %: C: 0.060% to 0.120%; Si: 0% to 0.70%; Mn: 1.60% to 3.00%; P: 0.100% or less; S: 0.0100% or less; N: 0.0100% or less; Al: 0.001% to 0.100%; Ti: 0.005% to 0.050%; and B: 0.0005% to 0.0100%. If necessary, the chemical composition contains one or two or more selected from the group consisting of Nb, V, W, Ni, Cu, Mo, Sn, Ca, Mg, and REM and a remainder of Fe and impurities, A microstructure includes 70% or more of upper bainite by area ratio, and a number density of iron carbides having a major axis of 0.01 μm or more included in the upper bainite is equal to or greater than 4/μm2.

公开(公告)号：US20220258806A1

公开(公告)日：2022-08-18

申请号：US17625670

申请日：2020-07-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Naoki KIMOTO

IPC: B62D25/04

Abstract: An objective of the present disclosure is to provide a front pillar outer that is inexpensive, lightweight and strong. A front pillar outer includes a glass-face-side flange part, a door-side flange part, and a main body part that connects the glass-face-side flange part and the door-side flange part to each other. In a partial area of the door-side flange part in a longitudinal direction thereof, a first plate part that is connected to a side edge of the door-side flange part is folded so that the first plate part is overlaid on the door-side flange part. In a partial area of the glass-face-side flange part in a longitudinal direction thereof, a second plate part that is connected to a side edge of the glass-face-side flange part is folded so that the second plate part is overlaid on the glass-face-side flange part.

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：US20220112569A1

公开(公告)日：2022-04-14

申请号：US17428715

申请日：2020-01-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Hiroyuki KAWATA ,  Kenichiro OTSUKA ,  Masafumi AZUMA

IPC: C21D8/00 ,  C22C38/02 ,  C22C38/16 ,  C22C38/04

Abstract: A steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0400%; Mn: 0.20% to 1.50%; P: 0.010% to 0.100%; Cr: 0.001% to 0.500%; Si: 0.200% or less; S: 0.020% or less; sol. Al: 0.200% or less; N: 0.0150% or less; Mo: 0% to 0.500%; B: 0% to 0.0100%; Nb: 0% to 0.200%; Ti: 0% to 0.200%; Ni: 0% to 0.200%; Cu: 0% to 0.100%; and a remainder including iron and impurities, in which a metallographic structure in a surface layer region includes ferrite having a volume fraction of 90% or more, and in the surface layer region, an average grain size of the ferrite is 1.0 μm to 15.0 μm, and a texture in which an XODF{001}/{111}, S as a ratio of an intensity of {001} orientation to an intensity of {111} orientation in the ferrite is 0.30 or more and less than 3.50 is included.

公开(公告)号：US20200038934A1

公开(公告)日：2020-02-06

申请号：US16498238

申请日：2018-04-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA

IPC: B21D22/26 ,  B21D37/08 ,  B21D24/00

Abstract: Disclosed is a press formed product which is formed from a single steel sheet. The press formed product includes two vertical wall portions, a top plate portion which connects two vertical wall portions with each other, and a projecting portion which projects from at least one boundary portion of two boundary portions each of which connects the vertical wall portion and the top plate portion with each other. In the projecting portion, a steel sheet extending from the vertical wall portion and a steel sheet extending from the top plate portion project from the boundary portion so as to overlap at an overlapping portion located at least at a distal end of the projecting portion. The projecting portion is present at least at a portion of the press formed product in a longitudinal direction. An angle formed between the top plate portion and the overlapping portion is larger than 180°.

公开(公告)号：US20220315120A1

公开(公告)日：2022-10-06

申请号：US17626958

申请日：2020-07-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Naoki KIMOTO

IPC: B62D25/04 ,  B62D27/02

Abstract: An objective of the present invention is to provide a front pillar outer that has high strength and high rigidity. In an area in which the first door-side flange part and a second door-side flange part overlap with each other, the first door-side flange part and the second door-side flange part are joined to each other. In an area in which the first glass-face-side flange part and the second glass-face-side flange part overlap with each other, the first glass-face-side flange part and the second glass-face-side flange part are joined to each other.