公开(公告)号：US20230295758A1

公开(公告)日：2023-09-21

申请号：US18017057

申请日：2021-06-29

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Xinyan JIN ,  Yong ZHONG ,  Meng CHEN ,  Xufei LI ,  Li WANG

IPC: C21D9/46 ,  C22C38/04 ,  C23C2/40 ,  C22C38/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/02

CPC classification number: C21D9/46 ,  C22C38/04 ,  C23C2/40 ,  C22C38/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/0222 ,  C21D2211/001

Abstract: The present invention provides a method for manufacturing a hot-dip galvanized steel sheet, comprising performing a heat treatment step, a hot dip plating step, and an alloying treatment step on a steel sheet having high Si and Mn content. The heat treatment step comprises a first heating phase and a soaking phase; a first heating atmosphere of the first heating stage contains 0.01-0.5% of O2 by volume, and the balance is N2 and inevitable impurities; a soaking atmosphere of the soaking stage contains 0.5% or more of H2 by volume, and the balance is N2 and inevitable impurities; dew points of the first heating atmosphere and the soaking atmosphere are controlled to be greater than or equal to −20° C. The present invention further provides a hot-dip galvanized steel sheet and a vehicle component. According to the present invention, by controlling the heat treatment atmospheres, the enrichment of Si and Mn alloy elements on the surface of the steel sheet, an interface between iron oxide and a base steel sheet, and an interface between reduced iron and the base steel sheet is suppressed, so that when a steel sheet having high Si and Mn content is selected as a base material for the hot-dip galvanized steel sheet, after undergoing the alloying treatment step, the hot-dip galvanized steel sheet can have both a plating layer of sufficient Fe content and a high elongation at break rate.

公开(公告)号：US11753709B2

公开(公告)日：2023-09-12

申请号：US16471289

申请日：2017-12-21

Applicant: POSCO

Inventor： Suk-Kyu Lee ,  Sang-Heon Kim ,  Kwang-Tai Min ,  Yon-Kyun Song

IPC: C23C2/06 ,  C22C18/00 ,  C23C2/26

CPC classification number: C23C2/06 ,  C22C18/00 ,  C23C2/26

Abstract: Provided are a hot-dipped galvanized steel material and a method for manufacturing the same. The hot-dipped galvanized steel material comprises an iron substrate and a hot-dipped galvanizing layer formed on the iron substrate, wherein the hot-dipped galvanizing layer comprises, by wt %, 0.01 to 0.5% of Al, 0.01 to 1.5% of Mg, 0.05 to 1.5% of Mn, 0.1 to 6% of Fe, and the balance of Zn and inevitable impurities, with a Zn—Fe—Mn based alloy phase present at the interface between the iron substrate and the hot-dipped galvanizing layer, and an area ratio of the Zn—Fe—Mn-based alloy phase to the hot-dipped galvanizing layer ranging from 1 to 60%.

公开(公告)号：US20230279534A1

公开(公告)日：2023-09-07

申请号：US18172476

申请日：2023-02-22

Applicant: Bluescope Steel Limited

Inventor： Ross McDowall Smith ,  Qiyang Liu ,  Joe Williams ,  Aaron Kiffer Neufeld ,  Scott Robin Griffiths

IPC: C23C2/06 ,  C23C2/12 ,  C23C30/00 ,  C22C21/10

CPC classification number: C23C2/06 ,  C23C2/12 ,  C23C30/00 ,  C22C21/10 ,  Y10T428/12736

Abstract: A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.

公开(公告)号：US11739393B2

公开(公告)日：2023-08-29

申请号：US16647894

申请日：2018-10-11

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: A method for producing a steel component from a flat steel sheet is provided. The produced steel component includes a substrate and a coating. The method ensures that the steel component has an Hdiff content below a certain level. The low Hdiff content minimizes the risk of hydrogen-induced cracking of the steel component after hot forming, including during subsequent use of the steel component. The Hdiff content in the hot-formed steel component is ensured to be below a certain level by selecting furnace parameters depending on the rolling degree and the sheet thickness of the flat steel sheet.

公开(公告)号：US11732341B2

公开(公告)日：2023-08-22

申请号：US16332329

申请日：2016-10-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Jun Haga ,  Kohichi Sano ,  Koutarou Hayashi ,  Kunio Hayashi ,  Masaharu Kameda ,  Akihiro Uenishi ,  Hiroyuki Kawata

IPC: C23C2/28 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/08 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C23C2/02 ,  C23C2/40 ,  C21D9/46 ,  C21D6/00 ,  C22C38/38 ,  C21D1/25 ,  C22C38/58 ,  C21D8/04 ,  C23C2/06 ,  C21D9/48

CPC classification number: C23C2/28 ,  B32B15/01 ,  C21D1/25 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0442 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: In a metal coated steel sheet, a chemical composition contains, in mass %, at least C: 0.03% to 0.70%, Si: 0.25% to 2.50%, Mn: 1.00% to 5.00%, P: 0.100% or less, S: 0.010% or less, sol. Al: 0.001% to 2.500, N: 0.020% or less, and a balance composed of iron and impurities, a metal structure contains greater than 5.0 vol % of retained austenite and greater than 5.0 vol % of tempered martensite, and satisfies a C content in the retained austenite being 0.85 mass % or more.

公开(公告)号：US20230243007A1

公开(公告)日：2023-08-03

申请号：US18009790

申请日：2020-06-12

Applicant: ArcelorMittal

Inventor： Etienne HOFFMANN ,  Veronique HEBERT

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D8/0236 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D8/0226 ,  C21D8/0273 ,  C21D8/0263 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A cold rolled and heat-treated steel sheet, the steel including, in weight percentage, 0.17%≤carbon≤0.25%, 2%≤manganese≤3%, 0.9%≤silicon≤2%, 0%≤aluminum≤0.09%, 0.01%≤molybdenum≤0.2%, 0%≤phosphorus≤0.02%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.09%, and optionally one or more of the following elements 0%≤chromium≤0.3%, 0%≤niobium≤0.06%, 0%≤titanium≤0.06%, 0%≤vanadium≤0.1%, 0%≤calcium≤0.005%, 0%≤boron≤0.010%, 0%≤Magnesium≤0.05%, 0%≤Zirconium≤0.05%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure of—50% to 80% of Bainite, 10% to 30% of residual austenite, 15% to 50% of Partitioned martensite, 0% to 10% of ferrite and 0% to 5% fresh martensite in area fractions, and a ferrite-enriched layer extending up to 50 microns from both surfaces of the steel sheet, such ferrite-enriched layer having a mean ferrite content from 55% to 80% in area fraction.

公开(公告)号：US20230235438A1

公开(公告)日：2023-07-27

申请号：US18010868

申请日：2021-06-18

Applicant: POSCO

Inventor： Il-Ryoung Sohn ,  Sung-Joo Kim ,  Tae-Chul Kim ,  Bong-Hwan Yoo ,  Myung-Soo Kim ,  Jong-Sang Kim ,  Sang-Tae Han ,  Kwang-Won Kim

IPC: C23C2/06 ,  C22C18/00 ,  C21D8/02 ,  C23C2/40

CPC classification number: C23C2/06 ,  C22C18/00 ,  C21D8/0226 ,  C21D8/0205 ,  C23C2/40

Abstract: Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al based steel sheet plating layer provided on at least one surface of the base steel sheet; and an Fe—Al based inhibition layer provided between the base steel sheet and the Zn—Mg—Al based plating layer, wherein the plating layer comprises, in wt %: 4% or more of Mg; 2.1 times or more of Mg content and 14.2% or less of Al; 0.2% or less (including 0%) of Si; 0.1% or less (including 0%) of Sn; the remainder Zn; and unavoidable impurities.

公开(公告)号：US20230220510A1

公开(公告)日：2023-07-13

申请号：US18010871

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D8/02 ,  C23C2/06 ,  C23C2/40 ,  C25D3/22

CPC classification number: C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C23C2/06 ,  C23C2/40 ,  C25D3/22 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.60% or more and less than 0.85%, and a steel microstructure with an area fraction of ferrite: less than 40%, tempered martensite and bainite: 40% or more in total, retained austenite: 3% to 15%, and ferrite, tempered martensite, bainite, and retained austenite: 93% or more in total. A 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction causes a change of 0.40 or more in (a grain size in a thickness direction)/(a grain size in a direction perpendicular to the thickness) of the tempered martensite in an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side. The steel sheet has a tensile strength of 980 MPa or more.

公开(公告)号：US11697266B2

公开(公告)日：2023-07-11

申请号：US17435613

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Mitsunobu ,  Jun Maki ,  Hiroshi Takebayashi ,  Takehiro Takahashi ,  Kohei Tokuda

IPC: B32B15/01 ,  C22C38/04 ,  C22C38/02 ,  C22C18/00 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40 ,  C22C18/04 ,  C23C2/02 ,  C23C28/02 ,  C23C2/26 ,  C23C30/00 ,  C23C2/12 ,  B32B15/04 ,  B32B15/18 ,  C23C2/04 ,  C22C38/00

CPC classification number: B32B15/013 ,  B32B15/012 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C22C18/00 ,  C22C18/04 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/20 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  C23C28/023 ,  C23C28/025 ,  C23C30/00 ,  C23C30/005 ,  C22C38/00 ,  Y10T428/12757 ,  Y10T428/12792 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979

Abstract: A plated steel includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 40.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder of Zn and impurities, and in a cross section of the plating layer, the area fraction of a Zn solid-solution Fe2Al5 phase in which 5% or more of Zn is solid-soluted is 10% to 60% and the area fraction of a MgZn2 phase is 10% to 90%.

公开(公告)号：US11680303B2

公开(公告)日：2023-06-20

申请号：US16982003

申请日：2018-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Takafumi Yokoyama ,  Riki Okamoto ,  Kohichi Sano ,  Hiroyuki Kawata ,  Kohei Ueda ,  Eisaku Sakurada

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C23C2/06 ,  C23C2/40 ,  C22C38/00 ,  B32B15/01 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

Abstract: This steel sheet has a predetermined chemical composition, in which a steel structure of an inside of the steel sheet contains, by volume fraction, soft ferrite: 0% to 30%, retained austenite: 3% to 40%, fresh martensite: 0% to 30%, a sum of pearlite and cementite: 0% to 10%, and a remainder includes hard ferrite, a number proportion of the retained austenite having an aspect ratio of 2.0 or more in the total retained austenite is 50% or more, a soft layer having a thickness of 1 to 100 μm from a surface in a sheet thickness direction is present, in ferrite contained in the soft layer, a volume fraction of grains having an aspect ratio of 3.0 or more is 50% or more, a volume fraction of retained austenite in the soft layer is 80% or less of the volume fraction of the retained austenite in the inside of the steel sheet, and a peak of an emission intensity at a wavelength indicating Si appears in a range of more than 0.2 μm and 10.0 μm or less from the surface.