公开(公告)号：US20240287635A1

公开(公告)日：2024-08-29

申请号：US18574136

申请日：2022-06-28

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Hantao HU ,  Xiong WU ,  Zhaoping CHEN ,  Zhigang MA ,  Zhiqiang ZHANG ,  Jianjun ZHI

IPC: C21D7/13 ,  B22D11/00 ,  C21C5/35 ,  C21C7/00 ,  C21C7/064 ,  C21C7/068 ,  C21C7/10 ,  C21D7/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

CPC classification number: C21D7/13 ,  B22D11/001 ,  C21C5/35 ,  C21C7/0006 ,  C21C7/064 ,  C21C7/068 ,  C21C7/10 ,  C21D7/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: Disclosed is a method for preparing a titanium-containing ultra-low-carbon steel, comprising molten iron pretreatment, converter primary smelting, vacuum refining, continuous casting, hot rolling, pickling, and cold rolling. After vacuum refining decarbonization is finished, the content of free oxygen in molten steel is 100-350 ppm; after Al is then added for deoxidation treatment, the circulation time of the molten steel is greater than or equal to 3 min; after other alloys and rare earth elements are then added to the molten steel to adjust the components of the molten steel to the specifications of a finished product, the circulation time of the molten steel is greater than or equal to 2 min; and finally, an oxide Re2O3·Al2O3 is generated in the molten steel, and the vacuum refining is finished. The method can effectively improve the properties of a deoxidation inclusion in steel, solve the problem of smooth running of casting of the molten steel, reduce the incidence of cold rolling defects caused by Al2O3, and improve the product quality of the titanium-containing ultra-low-carbon steel.

公开(公告)号：US12031577B2

公开(公告)日：2024-07-09

申请号：US17759451

申请日：2021-02-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Tatsuhiko Abe ,  Satoru Okawa ,  Masato Yuya

IPC: F16C3/08 ,  C23C8/26 ,  C21D7/13 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18

CPC classification number: F16C3/08 ,  C21D7/13 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C23C8/26 ,  F16C2202/04 ,  F16C2202/10 ,  F16C2206/04 ,  F16C2223/02 ,  F16C2223/14 ,  F16C2223/30

Abstract: A crankshaft with improved seizure resistance is provided. A crankshaft having journals 11 and pins 12 includes a compound layer containing iron and nitrogen on its surface, wherein, in the compound layer, for both the journals 11 and pins 12, the porosity area ratio of the thinner one of a region from the surface to a depth of 3.0 μm and a region across the total thickness of the compound layer is not higher than 10.0%, and both the journals 11 and pins 12 have such a surface geometry that the arithmetical mean deviation of the primary profile, Pa, is not larger than 0.090 μm.

公开(公告)号：US20240167136A1

公开(公告)日：2024-05-23

申请号：US18025277

申请日：2021-11-25

Applicant: ANGANG STEEL COMPANY LIMITED

Inventor： Yi DONG ,  Rendong LIU ,  Xiaoguang SHI ,  Chengqian SUN ,  Junxiong WANG ,  Chufei HAN

IPC: C22C38/38 ,  C21D6/00 ,  C21D7/13 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

CPC classification number: C22C38/38 ,  C21D6/002 ,  C21D7/13 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided are a high-strength and high-plasticity hot-forming steel with oxidation resistance for automobiles and a hot-forming process thereof, and the hot-forming steel has chemical compositions in mass percentages as follows: C: 0.35%-50%, Si: ≤0.20%, Mn: 1.50%-2.50%, P: 0.050%-0.10%, S≤0.004%, Als: 0.02%-0.06%, Nb: 0.03%-0.07%, Ti: 0.020%-0.050%, V: 0.08%-0.15%, Cr: 1.50%-3.20%, Mo: 0.10%-0.30%, B: ≤0.0040%, N≤0.005%, the balance Fe and inevitable impurities. The hot-forming steel provided in the present invention has high oxidation resistance, high strength and plasticity, does not need atmosphere protection during hot forming, and does not need shot blasting treatment after hot forming.

公开(公告)号：US11959177B2

公开(公告)日：2024-04-16

申请号：US17107955

申请日：2020-12-01

Applicant: JFE STEEL CORPORATION

Inventor： Masayuki Kasai ,  Takashi Iwamoto ,  Kunikazu Tomita

IPC: C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/00 ,  C21D8/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13

CPC classification number: C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13 ,  C21D2211/002 ,  C21D2211/004

Abstract: A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and

公开(公告)号：US20240052446A1

公开(公告)日：2024-02-15

申请号：US17901045

申请日：2022-09-01

Applicant: Taiyuan University of Technology

Inventor： Zhongkai REN ,  Jingbi YANG ,  Xiao LIU ,  Tao WANG ,  Peng CHEN ,  Xiaobao MA ,  Liping BIAN

IPC: C21D8/02 ,  C21D1/26 ,  C21D7/13 ,  B21B1/26 ,  B21B15/00 ,  B21B1/40

CPC classification number: C21D8/0252 ,  C21D1/26 ,  C21D7/13 ,  B21B1/26 ,  B21B15/00 ,  B21B1/40

Abstract: A device for continuously applying a transverse tension in an annealing process of an ultra-thin strip, including an unfolding and receiving mechanism for unwinding and winding the strip and an orthopedic mechanism for correcting the strip including an annealing furnace, and two orthopedic assemblies fixedly arranged inside the annealing furnace; the two orthopedic assemblies are symmetrically arranged on both sides of the strip, are parallel to an advancing direction of the strip and correspond to side edges of the strip, and include annular guide rails; each annular guide rail is fixedly connected with the annealing furnace and is slidably connected with an orthopedic part; the orthopedic part corresponds to each side edge of the strip, and each annular guide rail is internally provided with a driving part; the driving part is in transmission connection with the orthopedic part, and the orthopedic part is communicated with an air source part.

公开(公告)号：US20230243006A1

公开(公告)日：2023-08-03

申请号：US18004881

申请日：2021-05-26

Applicant: JFE STEEL CORPORATION

Inventor： Junya TOBATA ,  Kazuki ENDOH ,  Yuki TOJI

IPC: C21D3/06 ,  C21D7/13 ,  C21D10/00 ,  C21D7/02 ,  C21D9/46 ,  C21D9/08 ,  C21D9/52

CPC classification number: C21D3/06 ,  C21D7/13 ,  C21D10/00 ,  C21D7/02 ,  C21D9/46 ,  C21D9/08 ,  C21D9/52

Abstract: Provided is a dehydrogenation method capable of efficiently reducing hydrogen content in steel for thick or complexly-shaped steel materials and steel products in general. In a dehydrogenation method for a steel material, in a series of steel material production process including: a process of supplying a steel raw material; a process of subjecting the steel raw material to hot working; a process of inspecting a steel material obtained from the steel raw material; and a process of shipping the steel material, at least one of the steel raw material and the steel material at any stage from the supply process to the shipment process is subjected to, at least once, a sound wave irradiation treatment so that a sound pressure level at a surface of the at least one of the steel raw material and the steel material will be 30 dB or more.

公开(公告)号：US20230119030A1

公开(公告)日：2023-04-20

申请号：US18068904

申请日：2022-12-20

Applicant: ArcelorMittal

Inventor： Jean-Michel Mataigne ,  Didier Dauchelle ,  Florence Bertrand

IPC: C23C2/06 ,  C23C30/00 ,  C23C2/40 ,  C23C2/04 ,  B32B15/20 ,  B32B15/04 ,  C23C2/20 ,  C23C2/26 ,  C21D8/02 ,  C21D7/02 ,  C21D8/04 ,  C21D7/13 ,  C21D7/00 ,  C21D8/00 ,  C21D7/04 ,  B32B15/18 ,  B32B15/01 ,  C23C2/02 ,  C23C2/16 ,  C23C2/34

Abstract: A coated metal sheet includes a steel substrate and a coating on at least one surface of the steel substrate. The coating includes between 0.2 and 0.7% by weight of Al, with a remainder of the metal coating being Zn and inevitable impurities. The coated metal sheet was subjected to a skin pass operation after coating. An outer surface of the metal coating has a waviness Wa0.8 of less than or equal to 0.55 μm.

公开(公告)号：US11584970B2

公开(公告)日：2023-02-21

申请号：US16649739

申请日：2018-10-11

Applicant: POSCO

Inventor： Yu-Mi Ha ,  Young-Deok Jung ,  Sang-Deok Kang ,  Un-Hae Lee ,  Yong-Jin Kim ,  Sung-Kyu Kim ,  Young-Ju Kim

IPC: C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D8/00 ,  C21D7/13 ,  C21D8/02 ,  C21D9/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/16 ,  C22C38/04 ,  C22C38/18

Abstract: The present invention relates to a high manganese steel for low temperature applications and a method for manufacturing the same. The high manganese steel contains 0.3 wt % to 0.8 wt % of C, 18 wt % to 26 wt % of Mn, 0.01 wt % to 1 wt % of Si, 0.01 wt % to 0.5 wt % of Al, 0.1 wt % or less of Ti (excluding 0%), 1 wt % to 4.5 wt % of Cr, 0.1 wt % to 0.9 wt % of Cu, 0.03 wt % or less of S (excluding 0%), 0.3 wt % or less of P (excluding 0%), 0.001 wt % to 0.03 wt % of N, 0.004 wt % or less of B (excluding 0%), and a remainder of Fe and other inevitable impurities, wherein a microstructure comprises an austenite single phase structure, and an average grain size of the austenite is 50 μm or less.

公开(公告)号：US11572613B2

公开(公告)日：2023-02-07

申请号：US16874608

申请日：2020-05-14

Applicant: ArcelorMittal

Inventor： Jean-Michel Mataigne ,  Didier Dauchelle ,  Florence Bertrand

IPC: C23C2/06 ,  C23C2/40 ,  C23C2/04 ,  C23C2/20 ,  C23C2/26 ,  C23C2/16 ,  C23C2/34 ,  C23C30/00 ,  B32B15/04 ,  B32B15/20 ,  B32B15/01 ,  C21D8/02 ,  C21D7/02 ,  C21D8/04 ,  C21D7/13 ,  C21D7/00 ,  C21D8/00 ,  C21D7/04 ,  B32B15/18 ,  C23C2/02

Abstract: A steel part includes a steel sheet substrate and a coating on at least one surface of the steel sheet substrate. The coating includes between 0.2 and 0.7% by weight of Al, with a remainder of the metal coating being Zn and inevitable impurities. The steel sheet substrate and the coating have at least one deformation. An outer surface of the coating has a waviness Wa0.8 of less than or equal to 0.43 μm.

公开(公告)号：US20220380863A1

公开(公告)日：2022-12-01

申请号：US17771908

申请日：2020-10-20

Applicant: ArcelorMittal

Inventor： Raisa GRIGORIEVA ,  Florin DUMINICA ,  Brahim NABI ,  Pascal DRILLET ,  Thierry STUREL

IPC: C21D9/46 ,  C21D8/02 ,  C21D7/13 ,  C21D1/74 ,  B32B15/01 ,  B21D22/02

Abstract: A press hardening method including the following steps: A. the provision of a steel sheet for heat treatment being optionally coated with a zinc- or aluminum-based pre-coating, B. the flexible rolling of the steel sheet in the rolling direction so as to obtain a steel sheet having a variable thickness, C. the cutting of the rolled steel sheet to obtain a tailored rolled blank, D. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, E. the heat treatment of the tailored rolled blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the tailored rolled blank into a press tool, G. the hot-forming of the tailored rolled blank to obtain a part having a variable thickness,H. the cooling of the part having a variable thickness obtained at step G).