公开(公告)号：US20230183833A1

公开(公告)日：2023-06-15

申请号：US17923468

申请日：2021-06-03

Applicant: NIPPON STEEL CORPORATION

Inventor： Kengo TAKEDA ,  Katsuya NAKANO ,  Yuya SUZUKI ,  Eriko TSUKAMOTO

IPC: C21D9/46 ,  C21D8/02 ,  B21C47/02 ,  C23G1/08 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  B21C47/02 ,  C23G1/08 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C21D2211/005 ,  C21D2211/009 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/001

Abstract: Provided is a steel sheet having a predetermined chemical composition, wherein precipitates having a diameter of less than 0.1 μm are present in a number density of 10 to 200/μm2 in a depth region of 1 to 10 μm from a surface, an amount of dissolved C in a depth region of 10 to 60 μm from the surface is less than 0.20 mass %, and a tensile strength is 1200 MPa or more. Further, provided is a method for producing a steel sheet comprising a step of hot rolling a steel slab having a predetermined chemical composition, then coiling it at 580° C. or less, a step of pickling the hot rolled steel sheet to remove oxide scale and remove the surface layer of the hot rolled steel sheet down to at least 5 μm, and a step of cold rolling the hot rolled steel sheet, then holding it in an atmosphere of a dew point of −20 to 20° C. at a temperature region of 200 to 400° C. for 20 to 180 seconds and holding it at a temperature region of 740 to 900° C. for 40 to 300 seconds.

公开(公告)号：US11674209B2

公开(公告)日：2023-06-13

申请号：US16769912

申请日：2018-10-22

Applicant: ArcelorMittal

Inventor： Michel Bordignon ,  Jonas Staudte

IPC: C21D1/26 ,  C23C2/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C25D3/30

CPC classification number: C23C2/02 ,  C21D1/26 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C25D3/30

Abstract: A hot-dip coated steel substrate coated with a layer of Sn directly topped by a zinc or an aluminum based coating is provided, the steel substrate having the following chemical composition in weight percent:

0.10≤C≤0.4%,

1.2≤Mn≤6.0%,

0.3≤Si≤2.5%,

Al≤2.0%,

and on a purely optional basis, one or more elements such as

P

公开(公告)号：US11668002B2

公开(公告)日：2023-06-06

申请号：US16642559

申请日：2018-07-20

Applicant: ARCELORMITTAL

Inventor： Daniel Chaleix ,  Christian Allely ,  Eric Silberberg ,  Sergio Pace ,  Lucie Gaouyat

IPC: C23C2/02 ,  C23C14/16 ,  C23C2/06 ,  C23C2/12 ,  C23C2/36 ,  C23C14/02 ,  C23C14/24 ,  C23C14/35 ,  C23C14/56 ,  C23C28/02

CPC classification number: C23C14/16 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/36 ,  C23C14/028 ,  C23C14/24 ,  C23C14/35 ,  C23C14/562 ,  C23C28/023

Abstract: A coated metallic substrate including at least a first coating of aluminum, such first coating having a thickness below 5 μm and being directly topped by a second coating including from 0.5 to 5.9% by weight of magnesium, the balance being zinc.

公开(公告)号：US20230160033A1

公开(公告)日：2023-05-25

申请号：US18094503

申请日：2023-01-09

Applicant: ArcelorMittal

Inventor： Anirban CHAKRABORTY ,  Hassan GHASSEMI-ARMAKI

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  B23K11/11

CPC classification number: C21D9/46 ,  B23K11/11 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C28/025 ,  C23C28/027 ,  B23K2103/04 ,  C21D2211/009

Abstract: A galvannealed steel sheet having a steel substrate coated with a first alloy layer with iron and nickel directly topped by a second alloy layer based on zinc, the first and second alloyed layers being alloyed through diffusion such that the second alloy layer includes from 5 to 15 wt.% of iron, from 0 to 15 wt.% of nickel, a balance being zinc.

公开(公告)号：US11655517B2

公开(公告)日：2023-05-23

申请号：US16761953

申请日：2018-09-17

Applicant: POSCO CO., LTD

Inventor： Joo-Hyun Ryu ,  Kyoo-Young Lee ,  Sea-Woong Lee

IPC: C23C2/06 ,  C23C2/40 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C23C2/28 ,  C22C38/26 ,  C22C38/28 ,  C23C30/00 ,  B32B15/04 ,  B32B15/18 ,  C22C38/18 ,  C22C38/24 ,  C23C28/02 ,  C22C38/42 ,  C23C2/26 ,  C22C38/50 ,  C22C38/20 ,  C22C38/46 ,  C22C38/38 ,  C22C38/44 ,  C22C38/22 ,  C22C38/40 ,  C23C2/12 ,  C23C28/00 ,  C22C38/48

CPC classification number: C21D9/46 ,  B32B15/01 ,  B32B15/012 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/008 ,  Y02P10/20 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/26

Abstract: The present invention relates to an automotive steel sheet and, more specifically, provides: an ultrahigh-strength and high-ductility steel sheet ensuring ultrahigh strength and high ductility and, simultaneously, having excellent cold formability due to a high yield strength ratio, and improved collision characteristics.

公开(公告)号：US20230147056A1

公开(公告)日：2023-05-11

申请号：US17802583

申请日：2020-02-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Takehiro TAKAHASHI ,  Jun MAKI

IPC: C22C30/06 ,  B32B15/01 ,  C23C2/06

CPC classification number: C22C30/06 ,  B32B15/013 ,  C23C2/06

Abstract: A hot stamped body comprising a steel base material and an Al-Zn-Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 85.0% of an Mg—Zn containing phase and 15.0 to 90.0% of an Fe—Al containing phase, the Mg—Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2 Zn3 phase, and MgZn2 phase, and the Fe—Al containing phase comprises at least one of an FeAl phase and Fe—Al—Zn phase and an area ratio of the Fe—Al—Zn phase in the main layer is 10.0% or less.

公开(公告)号：US20190194775A1

公开(公告)日：2019-06-27

申请号：US16329672

申请日：2017-09-28

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ONO ,  Shimpei YOSHIOKA ,  Nobuyuki NAKAMURA ,  Hiroshi HASEGAWA

IPC: C21D9/46 ,  C23C2/06 ,  C23C2/40 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/46 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C22C38/44 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0405 ,  C21D8/041 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40

Abstract: A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure including martensite and bainite. The total area fraction of the martensite and the bainite to the entirety of the microstructure is more than 90% and 100% or less. The microstructure includes inclusion clusters A and B, the content of the clusters A in the microstructure being 2 clusters/mm2 or less, and the content of the clusters B in the microstructure being 5 clusters/mm2 or less. The microstructure includes carbide particles including Fe as a main constituent which have an aspect ratio of 2.0 or less and a major axis of 0.30 μm or more and 2 μm or less. The content of the carbide particles in the microstructure is 4000 particles/mm2 or less. The microstructure includes prior γ grains having an average size of 6 to 15 μm.

公开(公告)号：US20190040487A1

公开(公告)日：2019-02-07

申请号：US15668751

申请日：2017-08-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Charles Enloe ,  Curt D. Horvath ,  David Yang ,  Qi Lu ,  Wu Tao

IPC: C21D9/46 ,  C21D8/02 ,  C21D3/04 ,  C23C2/06 ,  B32B15/01 ,  B23K11/11 ,  B23K11/16 ,  B23K26/22 ,  B23K26/322

CPC classification number: C21D9/46 ,  B23K11/11 ,  B23K11/115 ,  B23K11/166 ,  B23K26/22 ,  B23K26/322 ,  B23K2103/166 ,  B32B15/013 ,  C21D3/04 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0257 ,  C21D2211/005 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C8/18 ,  C23C28/02 ,  C23C28/025 ,  C23C30/00 ,  C23C30/005 ,  Y10T428/12458 ,  Y10T428/12799 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

Abstract: A multilayer steel includes a core formed of transformation-induced plasticity (TRIP) steel. A decarburized layer is exterior to the core on at least one side thereof. The decarburized layer has reduced carbon content relative to the core. A zinc-based layer is exterior to the decarburized layer. The decarburized layer may have a composition of at least 80 percent ferrite, such that LME is reduced or mitigated. In some configurations, the decarburized layer is between 10-50 microns thick. A method of creating a coated advanced high-strength steel component is also provided. An apparatus for forming a coated advanced high-strength steel is also provided. The core of the multilayer steel may have a carbon weight-percent of less than or equal to 0.4. The decarburized layer of the multilayer steel may have a carbon weight-percent of less than or equal to 50 percent of the carbon weight-percent of the core.

公开(公告)号：US20180327884A1

公开(公告)日：2018-11-15

申请号：US15779157

申请日：2016-11-08

Applicant: JFE STEEL CORPORATION

Inventor： Mai AOYAMA ,  Minoru TANAKA ,  Yoshitsugu SUZUKI ,  Yoshiyasu KAWASAKI ,  Hideyuki TAKAHASHI

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/60 ,  C22C38/02 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/185 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: A high-strength galvanized steel sheet and a method for producing the steel sheet. The steel sheet has a composition that includes C: 0.030% to 0.250%, Si: 0.01% to 3.00%, Mn: 2.00% to 10.00%, P: 0.001% to 0.100%, S: 0.0001% to 0.0200%, N: 0.0005% to 0.0100%, Ti: 0.005% to 0.200%, on a mass basis, and Fe and inevitable impurities. Additionally, the steel sheet has concentration of solute Mn at a depth of 5 μm or less from a surface of the steel sheet that is 1.50% by mass or less, and a value obtained by dividing the average mass percentage of Mn in retained austenite by the average mass percentage of Mn in ferrite is 2.0 or more.

公开(公告)号：US20180312938A1

公开(公告)日：2018-11-01

申请号：US16027980

申请日：2018-07-05

Applicant: FIVES STEIN

Inventor： Alain Genaud

IPC: C21D9/52 ,  C23C2/40 ,  C21D9/68 ,  C23C2/02 ,  C23G3/02 ,  C23G1/08 ,  C21D1/667 ,  C21D1/60 ,  C21D9/573 ,  C21D6/00 ,  C21D9/56 ,  C23C2/06

CPC classification number: C21D9/52 ,  C21D1/60 ,  C21D1/667 ,  C21D6/00 ,  C21D9/563 ,  C21D9/573 ,  C21D9/5737 ,  C21D9/68 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C23G1/08 ,  C23G1/088 ,  C23G3/023 ,  C23G3/027 ,  C23G3/028

Abstract: Disclosed is a method for continuous thermal treatment of a steel strip. The strip passes through consecutive thermal treatment chambers, is quickly cooled in at least one of the chambers by spraying liquid onto the strip, or by spraying a fluid made up of gas and liquid or spraying a combination of gas and liquid forming a mist. After quick cooling, a protective metal layer is deposited on the strip by dip coating. The cooling fluid strips iron oxides or other alloy elements contained in the steel to be treated, minimizing oxidation and reducing the oxides on the strip. Spray pressure and distance are chosen to facilitate the stripping property and the mechanical action of the sprayed fluid, reducing the layer of oxides on the strip. The temperature of the strip at the end of the cooling step is the temperature necessary for carrying out the desired treatment cycle.