公开(公告)号：US20210079498A1

公开(公告)日：2021-03-18

申请号：US16493942

申请日：2018-03-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU

IPC: C22C18/04 ,  B32B15/01 ,  C23C2/06 ,  C23C2/40 ,  C23C2/12 ,  C22C21/10

Abstract: A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass, and the coating layer has a granular Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al, and the granular Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a granular Mg2Sn phase having a crystal grain size of less than 1 μm dispersed in the Zn phase.

公开(公告)号：US20210039354A1

公开(公告)日：2021-02-11

申请号：US16979820

申请日：2018-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei TOKUDA ,  Takuya MITSUNOBU ,  Akihiro SENGOKU ,  Kenichiro MATSUMURA

IPC: B32B15/01 ,  C22C30/02 ,  C22C30/06 ,  C23C2/12 ,  C23C2/06 ,  C22C18/04 ,  C22C38/32 ,  C22C38/28 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/28 ,  B21D22/02

Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 μm, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn2 phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 3 μm to 40 μm.

公开(公告)号：US20250092500A1

公开(公告)日：2025-03-20

申请号：US18727014

申请日：2022-12-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI

IPC: C23C2/06 ,  B32B15/01 ,  C22C18/00 ,  C22C18/04 ,  C23C2/40

Abstract: Provided is a plated steel sheet comprising a base steel sheet and a plating layer formed on a surface of the base steel sheet, wherein the plating layer has a predetermined chemical composition, and when measuring the plating layer by X-ray diffraction, a peak intensity I(002) derived from a (002) plane of an η phase and a peak intensity I(101) derived from a (101) plane of the η phase satisfy 0

公开(公告)号：US20250003047A1

公开(公告)日：2025-01-02

申请号：US18711915

申请日：2022-12-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Shota HAYASHIDA ,  Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI

IPC: C23C2/40 ,  B32B15/01 ,  C22C18/04 ,  C22C21/00 ,  C22C21/02 ,  C22C21/10 ,  C22C30/06 ,  C22C38/04 ,  C23C2/02 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/20 ,  C23C2/28

Abstract: This plated steel sheet includes a base steel sheet, a plated layer formed on a surface of the base steel sheet, and an oxide film formed on a surface of the plated layer, the plated layer has a chemical composition containing Sc: 0.000010 to 4.0% in mass %, and has a cross section, in the thickness direction, in which the area fraction of an intermetallic compound phase containing Sc and having an equivalent circle diameter of 5.0 μm or less is 0.1 to 10.0%, and the oxide film has a thickness of 10 nm or more.

公开(公告)号：US20240425962A1

公开(公告)日：2024-12-26

申请号：US18825730

申请日：2024-09-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Kohei TOKUDA ,  Hiroshi TAKEBAYASHI

IPC: C23C2/06 ,  C23C2/00 ,  C23C2/40

Abstract: The hot-dip plated steel material includes a steel material and a hot-dip plated layer disposed on a surface of the steel material, the hot-dip plated layer has a certain chemical composition, and the hot-dip plated layer has a diffraction intensity obtained from a result of X-ray diffraction measurement, the diffraction intensity satisfying a certain relationship.

公开(公告)号：US20240327962A1

公开(公告)日：2024-10-03

申请号：US18711903

申请日：2022-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Takafumi YOKOYAMA ,  Chisato YOSHINAGA ,  Takuya KUWAYAMA ,  Kengo TAKEDA ,  Takuya MITSUNOBU ,  Seiji FURUSAKO ,  Tatsuya OBUCHI

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40

CPC classification number: C22C38/04 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

Abstract: Provided are a hot dip galvanized steel sheet having a predetermined chemical composition, and a steel microstructure comprising, by vol %, ferrite: 0 to 50%, tempered martensite: 1% or more, retained austenite: 5% or more, fresh martensite: 0 to 15%, total of pearlite and cementite: 0 to 5%, and balance: bainite, when measuring by GDS, a maximum value of Al concentration of an Al rich layer present at an interface of the base steel sheet and the hot dip galvanized layer is 2.0 mass % or more and an Sis/Sib right under the interface is 0.90 or less, a number density of recessed parts with a depth of more than 2 μm at the interface is 2.0/100 μm or less per interface length, and a tensile strength is 980 MPa or more, and a method for producing the same.

公开(公告)号：US20240318288A1

公开(公告)日：2024-09-26

申请号：US18579732

申请日：2022-09-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Keitaro MATSUDA ,  Hiroshi TAKEBAYASHI

IPC: C22C38/38 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/34

CPC classification number: C22C38/38 ,  B32B15/013 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/34

Abstract: High strength plated steel sheet excellent in LME resistance, that is, plated steel sheet comprising steel sheet and a plating layer containing Zn on the same, in which the steel sheet has a tensile strength of 780 MPa or more, the steel sheet has a chemical composition containing, by mass %,



C: 0.05 to 0.40%,
Si: 0.2 to 3.0%,
Mn: 0.1 to 5.0%,
sol. Al: 0.4 to 1.50%, etc. and having a balance of Fe and impurities, and,

in any vertical cross section of the steel sheet, ferrite phases with a circle equivalent diameter of 1 μm or less are contained in a region from a surface layer down to a depth of 2 μm in a number density of 2 to 30/μm2 and the ferrite phases include internal oxides with a circle equivalent diameter of 2 to 100 nm in a number density of 3/μm2 or more.

公开(公告)号：US20240218491A1

公开(公告)日：2024-07-04

申请号：US18288223

申请日：2021-04-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Keitaro MATSUDA ,  Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI

IPC: C22C38/38 ,  C21D1/74 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C23C2/06

CPC classification number: C22C38/38 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0252 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C23C2/06

Abstract: A steel sheet comprising, by mass %, C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 5.0%, wherein a surface layer of the steel sheet contains grain boundary oxides, a Ratio A of a length of the grain boundary oxides projected on a surface of the steel sheet to a length of the surface of the steel sheet is 50% or more and 100% or less, a number density of granular oxides is less than 4.0/μm2, the steel sheet comprises an Si—Mn depleted layer having a thickness of 3.0 μm or more from the surface of the steel sheet, and Si and Mn contents of the Si—Mn depleted layer at the ½ position of the thickness and not containing oxides are respectively less than 10% of the Si and Mn contents at a sheet thickness center part of the steel sheet, and a plated steel sheet using the same are provided.

公开(公告)号：US20240141469A1

公开(公告)日：2024-05-02

申请号：US18272712

申请日：2022-03-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Keitaro MATSUDA ,  Takuya MITSUNOBU ,  Masaaki URANAKA ,  Jun MAKI ,  Hiroshi TAKEBAYASHI

IPC: C23C2/06 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C23C2/02 ,  C23C2/16 ,  C23C2/28

CPC classification number: C23C2/06 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0252 ,  C21D8/0278 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38 ,  C23C2/022 ,  C23C2/16 ,  C23C2/285

Abstract: High strength plated steel sheet having high hydrogen embrittlement resistance, that is, alloyed hot dip galvannealed steel sheet including steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50% and a alloyed hot dip galvannealed layer deposited on at least one surface of the steel sheet to 10 to 100 g/m2 and containing Fe: 5.0 to 15.0% and Al: 0.01 to 1.0%, having an internal oxidation layer including grain boundary oxides in a surface layer of the steel sheet, when examining a cross-section of a surface layer of the steel sheet, a Ratio A of the length of the grain boundary oxides projected an interface of the steel sheet and the alloyed hot dip galvannealed layer to the length of interface is 50% or more and 100% or less, and a surface depleted layer with a steel composition not including the grain boundary oxides which satisfies, by mass %, Si≤0.6% and Al≥0.05% is included at a depth of ½ of the average depth of the internal oxidation layer.

公开(公告)号：US20240084422A1

公开(公告)日：2024-03-14

申请号：US18285460

申请日：2023-03-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Kohei TOKUDA ,  Hiroshi TAKEBAYASHI

IPC: C22C18/04 ,  B32B15/01 ,  C23C2/06

CPC classification number: C22C18/04 ,  B32B15/013 ,  C23C2/06

Abstract: The hot-dip plated steel material includes a steel material and a hot-dip plated layer disposed on a surface of the steel material, the hot-dip plated layer has a certain chemical composition, and the hot-dip plated layer has a diffraction intensity obtained from a result of X-ray diffraction measurement, the diffraction intensity satisfying a certain relationship.