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公开(公告)号：US20250129443A1
公开(公告)日：2025-04-24
申请号：US18689962
申请日：2022-09-12
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO , Hirokazu KOBAYASHI
Abstract: A quenching apparatus that is configured to cool a metal sheet, the quenching apparatus including: a cooling device that includes a plurality of jet nozzles that is configured to spray a cooling fluid onto a front surface and a back surface of the metal sheet; and a flow rate adjustment processor that that is configured to set a flow rate of the cooling fluid that is sprayed from the plurality of jet nozzles onto the front surface and the back surface of the metal sheet based on a shape of the metal sheet before quenching.
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公开(公告)号：US20250129445A1
公开(公告)日：2025-04-24
申请号：US18689954
申请日：2022-09-12
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO , Hirokazu KOBAYASHI
Abstract: A quenching apparatus that is configured to cool a metal sheet, the quenching apparatus including: a cooling device that is configured to perform quenching by cooling the metal sheet with a cooling fluid; a plurality of shape correction rolls that includes at least a front shape correction roll and a back shape correction roll that are configured to be respectively provided at a front surface and a back surface of the metal sheet and press, in a thickness direction of the metal sheet, the metal sheet before being quenched; and a pressing processor that is configured to set, based on a shape of the metal sheet before quenching, a pressing quantity of each shape correction roll of the plurality of shape correction rolls.
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公开(公告)号：US20240360528A1
公开(公告)日：2024-10-31
申请号：US18683982
申请日：2022-07-29
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO , Hirokazu KOBAYASHI
CPC classification number: C21D1/63 , C21D1/22 , C21D1/667 , C21D9/46 , C23C2/06 , C25D3/22 , C21D2211/008
Abstract: A metal-sheet quenching apparatus cools a metal sheet while conveying the metal sheet and includes a cooling tank in which a cooling fluid is to be stored and the metal sheet is immersed in the cooling fluid to be cooled; restraining rolls that are installed inside the cooling tank and convey the metal sheet that has been cooled in the cooling tank while restraining the metal sheet in the thickness direction; a water-level adjustor that adjusts the height of a fluid surface of the cooling fluid inside the cooling tank; and a position control device that adjusts the height of the fluid surface of the cooling fluid inside the cooling tank by controlling the operation of the water-level adjustor.
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公开(公告)号：US20230313355A1
公开(公告)日：2023-10-05
申请号：US18041695
申请日：2021-06-15
Applicant: JFE STEEL CORPORATION
Inventor： Maiko HIYAMA , Hideyuki TAKAHASHI , Soshi YOSHIMOTO
Abstract: Provided are a method of predicting hydrogen content in steel of a steel strip etc. Provided is, in a continuous galvanizing line that performs manufacturing processes including an annealing process, a coating process, and a reheating process of a steel strip, a method of predicting hydrogen content in steel of a steel strip downstream of the reheating process, including acquiring at least one parameter selected from operation parameters of the continuous galvanizing line and transformation rate information measured in at least one of the annealing process and the reheating process as input data, and predicting hydrogen content in steel of a steel strip downstream of the reheating process using a prediction model of hydrogen content in steel that has been trained by machine learning and that outputs information on hydrogen content in steel of a steel strip downstream of the reheating process as output data.
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公开(公告)号：US20240360530A1
公开(公告)日：2024-10-31
申请号：US18682680
申请日：2022-07-29
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO , Hirokazu KOBAYASHI
CPC classification number: C21D9/0062 , C21D1/18 , C21D6/005 , C21D6/008 , C21D9/46 , C22C38/002 , C22C38/02 , C22C38/04
Abstract: A metal-sheet quenching apparatus that cools a metal sheet while conveying the metal sheet. The metal-sheet quenching apparatus includes a cooling device that cools a metal sheet that is conveyed, restraining rolls that convey the metal sheet cooled by the cooling device while restraining the metal sheet in the thickness direction, a roll moving device that moves the restraining rolls in the conveyance direction of the metal sheet, and a movement control device that controls the operation of the roll moving device to adjust the position of the restraining rolls.
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Patent Agency Ranking
公开(公告)号：US20240318272A1
公开(公告)日：2024-09-26
申请号：US18580482
申请日：2022-05-26
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO
CPC classification number: C21D1/63 , C21D1/18 , C21D8/0205 , C21D8/0236 , C21D8/0247 , C21D8/0278 , C21D9/46
Abstract: A quenching apparatus which produces a good cooling effect on a metal sheet, facilitates switching between a condition of performing quenching and a condition of not performing the quenching, and can suppress thermal deformation caused by thermal radiation from the metal sheet. The quenching apparatus includes a bath that contains a cooling medium in which a metal sheet is immersed and at least one pair of rolls, which are disposed such that the metal sheet running in the bath is interposed between the at least one pair of rolls in the bath, distances of which from the metal sheet are changeable, and rotate at a peripheral speed higher than or equal to a running speed of the metal sheet.
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7.发明公开公开(公告)号：US20240301524A1
公开(公告)日：2024-09-12
申请号：US18273830
申请日：2021-10-27
Applicant: JFE STEEL CORPORATION
Inventor： Soshi YOSHIMOTO
CPC classification number: C21D1/667 , C21D1/18 , C21D6/00 , C21D9/0062 , C21D9/46 , C21D2211/008
Abstract: A quenching apparatus and a quenching method for a metal sheet with which it is possible to inhibit shape defects from occurring in the metal sheet when quenching is performed and a method for manufacturing a steel sheet. The quenching apparatus is placed on an exit side of a soaking zone in a continuous annealing furnace, and the apparatus includes a cooling fluid-spray device having plural spray nozzles for spraying mist onto both surfaces of a continuously transported metal sheet, and at least one pair of restraining rolls for restraining the metal sheet on both surfaces thereof in a region from a cooling start point to a cooling finish point in the cooling fluid-spray device.
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公开(公告)号：US20240344158A1
公开(公告)日：2024-10-17
申请号：US18579117
申请日：2022-05-11
Applicant: JFE STEEL CORPORATION
Inventor： Hideyuki TAKAHASHI , Soshi YOSHIMOTO
CPC classification number: C21D1/667 , C21D1/18 , C21D9/0062 , C21D2211/008
Abstract: A quenching apparatus for a metal sheet, continuous annealing equipment, a method for quenching a metal sheet, a method for manufacturing a cold rolled steel sheet, and a method for manufacturing a coated steel sheet. The quenching apparatus has a water tank in which the metal sheet is passed and immersed in a liquid to cool the metal sheet, a water injection apparatus placed in the water tank, and plural restraining roll pairs with which the metal sheet that is passed in the water tank is restrained. The water injection apparatus has plural water injection nozzles arranged in a sheet passing direction of the metal sheet on front and back surface sides of the metal sheet. A position of each of the plural restraining roll pairs is separately adjusted with respect to the metal sheet in accordance with operation conditions.
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公开(公告)号：US20220298594A1
公开(公告)日：2022-09-22
申请号：US17639086
申请日：2020-08-25
Applicant: JFE STEEL CORPORATION
Inventor： Takuya HIRASHIMA , Shimpei YOSHIOKA , Shinjiro KANEKO , Soshi YOSHIMOTO , Tomohiro HASHIMUKAI , Yoshihiko ONO
IPC: C21D9/46 , C22C38/38 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18
Abstract: A steel sheet having a steel microstructure including, by area %, martensite in a range of 20% or more and 100% or less, ferrite in a range of 0% or more and 80% or less, and the balance being 5% or less. A residual stress generated at the transverse center of the steel sheet when the steel sheet is subjected to a V-bending process is 800 MPa or less. A residual stress generated at the transverse end of the steel sheet when the steel sheet is subjected to a V-bending process is 90% or more and 110% or less of the residual stress generated at the transverse center of the steel sheet. The maximum amount of warpage of the steel sheet sheared to a length of 1 m in the longitudinal direction is 15 mm or less.
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公开(公告)号：US20220195555A1
公开(公告)日：2022-06-23
申请号：US17603877
申请日：2020-04-22
Applicant: JFE STEEL CORPORATION
Inventor： Yuiko EHASHI , Masanori TAKENAKA , Hirokazu SUGIHARA , Soshi YOSHIMOTO
IPC: C21D9/46 , C22C38/34 , C22C38/26 , C22C38/22 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , H01F1/147
Abstract: A grain oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C:0.02-0.10%, Si:2.0-5.0%, Mn:0.01-1.00%, sol. Al:0.01-0.04%, N:0.004-0.020% and S+Se:0.002-0.040% to a temperature of higher than 1280° C., and subjecting the sheet to a hot rolling, a hot-band annealing, a single cold rolling or two or more cold rollings having an intermediate annealing between each cold rolling and a primary recrystallization annealing combined with a decarburization annealing, applying an annealing separator onto a steel sheet surface, and subjecting the sheet to a finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C./s from 800° C. to 300° C. in the cooling process from a maximum achieving temperature in at least one annealing of the hot-band annealing and the intermediate annealing.
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