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公开(公告)号：US20170327926A1
公开(公告)日：2017-11-16
申请号：US15531081
申请日：2015-09-01
Applicant: JFE STEEL CORPORATION
Inventor： Soshi Yoshimoto , Masaru Miyake , Gentaro Takeda
CPC classification number: C21D9/563 , C21D1/18 , C21D1/63 , C21D1/667 , C21D9/46 , C21D9/562 , C21D9/573 , C21D9/5735 , C21D9/5737 , C21D2211/008
Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf−150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.
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公开(公告)号：US20240318290A1
公开(公告)日：2024-09-26
申请号：US18577328
申请日：2022-06-09
Applicant: JFE Steel Corporation
Inventor： Gentaro Takeda , Hideyuki Takahashi , Mai Aoyama , Maiko Watanabe , Tatsuya Ehashi
CPC classification number: C23C2/0224 , C22C38/002 , C22C38/02 , C22C38/04 , C23C2/004 , C23C2/285 , C23C2/40
Abstract: When a hot-dip galvanizing treatment is performed on a steel sheet containing Si in an amount of 0.2 mass % or more by using a continuous hot-dip galvanizing apparatus including an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are arranged in this order, a snout adjacent to the cooling zone, and hot-dip galvanizing equipment, a humidified nitrogen-hydrogen gas mixture containing moisture in such a manner that a certain expression is satisfied is supplied into a region on the downstream side of the soaking zone, gas nozzles are arranged over the entire perimeter of an inner wall of the snout, nitrogen gas or a nitrogen-hydrogen gas mixture is supplied through the gas nozzles downward along the inner wall, and the dew point in the snout is controlled to be −50° C. to −35° C.
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公开(公告)号：US10648054B2
公开(公告)日：2020-05-12
申请号：US15509353
申请日：2015-08-20
Applicant: JFE STEEL CORPORATION
Inventor： Yoichi Makimizu , Yoshitsugu Suzuki , Hideyuki Takahashi , Gentaro Takeda , Koichiro Fujita
IPC: C21D6/00 , C22C38/04 , C22C38/02 , C21D9/46 , C23C2/02 , C23C2/06 , C23C2/40 , C23C2/28 , C22C38/00 , C21D8/02 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/32 , C23F17/00
Abstract: A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, C: 0.05 to 0.30%, Si: 0.1 to 2.0% and Mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature TC, and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % Al.
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公开(公告)号：US12031192B2
公开(公告)日：2024-07-09
申请号：US18332752
申请日：2023-06-12
Applicant: JFE STEEL CORPORATION
Inventor： Gentaro Takeda , Hideyuki Takahashi , Tetsuya Iwata , Koji Sawamura
IPC: C21D9/46 , C21D1/26 , C21D9/56 , C22C38/02 , C23C2/00 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40
CPC classification number: C21D9/46 , C21D1/26 , C21D9/561 , C21D9/562 , C22C38/02 , C23C2/0035 , C23C2/0038 , C23C2/004 , C23C2/0224 , C23C2/06 , C23C2/28 , C23C2/40
Abstract: Provided is a continuous hot-dip galvanizing apparatus comprising: a vertical annealing furnace having heating, soaking zone, and cooling zones therein; and a hot-dip galvanizing line downstream of the cooling zone. The heating, soaking, and cooling zones each have, in its upper portion, at least one upper hearth roll and, in its lower portion, at least one lower hearth roll. The soaking zone has a first and second humidified gas supply ports to supply a humidified gas having a dew point of 10° C. to 30° C. to the soaking zone. The first and second humidified gas supply ports are 1.0 m to 5.0 m lower than the center of the lower and upper hearth rolls, respectively, and overlap the steel sheet. The first humidified gas supply port is provided only for an ascending pass and the second humidified gas supply port is provided only for a descending pass.
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公开(公告)号：US10988836B2
公开(公告)日：2021-04-27
申请号：US16083678
申请日：2017-02-16
Applicant: JFE STEEL CORPORATION
Inventor： Yoichi Makimizu , Yoshitsugu Suzuki , Gentaro Takeda , Hiroshi Hasegawa
IPC: C23C2/02 , C21D9/46 , C22C38/02 , C22C38/04 , C23C2/06 , C21D1/26 , C22C38/08 , C21D1/76 , C22C38/00 , C22C38/06 , C22C38/12 , C21D9/56 , C22C38/28 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/32 , C22C38/38 , C22C38/60
Abstract: A method for producing a high-strength galvanized steel sheet having excellent fatigue resistance properties. The method includes an oxidation processing in which a steel sheet is heated at a temperature of 400 to 750° C. in an atmosphere having an O2 concentration of 1000 ppm by volume or more and a H2O concentration of 1000 ppm by volume or more, and the steel sheet is heated at a temperature of 600 to 850° C. in an atmosphere having an O2 concentration of less than 1000 ppm by volume and a H2O concentration of 1000 ppm by volume or more. The method also includes reduction-annealing in which the steel sheet is heated at a heating rate of 0.1° C./sec or more to a temperature of 650 to 900° C. in an atmosphere having a H2 concentration of 5 to 30 vol % and a H2O concentration of 10 to 1000 ppm by volume.
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Patent Agency Ranking
6.发明申请METHOD FOR CONTROLLING DEW POINT OF REDUCTION FURNACE, AND REDUCTION FURNACE 审中-公开用于控制还原炉的DEW点和减少炉的方法公开(公告)号：US20160363372A1
公开(公告)日：2016-12-15
申请号：US15119022
申请日：2015-02-18
Applicant: JFE STEEL CORPORATION
Inventor： Gentaro Takeda , Hideyuki Takahashi , Masaru Miyake , Yoichi Makimizu , Yoshitsugu Suzuki
CPC classification number: F27D7/02 , C21D1/26 , C21D1/76 , C21D9/0012 , C21D9/46 , C21D9/561 , C23C2/003 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40 , F27D2019/0028
Abstract: Provided are a method for controlling a dew point in a reducing furnace and a reducing furnace in which, even in the case of galvanizing Si-added steel, coating adhesion can be secured, alloying treatment can be performed without increasing the alloying temperature excessively, and it is possible to obtain a hot-dip galvanized steel sheet having an excellent coating appearance. When a steel sheet is subjected to annealing and hot-dip galvanizing treatment using continuous hot-dip galvanizing equipment including at least a radiant tube-type reducing furnace, a mixed gas of a dry gas and a humidified gas by a humidifying device having a water vapor permeable membrane is used as a gas to be supplied into the reducing furnace. The mixed gas is supplied into the reducing furnace, thereby controlling the dew point in the reducing furnace.
Abstract translation: 提供一种在还原炉和还原炉中控制露点的方法，其中即使在镀锌的Si添加钢的情况下，也可以确保涂层的粘附性，可以在不增加合金化温度的情况下进行合金化处理，以及 可以获得具有优异涂层外观的热浸镀锌钢板。 当使用包括至少辐射管式还原炉的连续热浸镀锌设备对钢板进行退火和热浸镀锌处理时，通过具有水的加湿装置将干燥气体和加湿气体的混合气体 透气膜用作供给到还原炉中的气体。 将混合气体供给到还原炉中，从而控制还原炉中的露点。
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7.发明授权公开(公告)号：US11718889B2
公开(公告)日：2023-08-08
申请号：US16955041
申请日：2018-11-20
Applicant: JFE STEEL CORPORATION
Inventor： Gentaro Takeda , Hideyuki Takahashi , Tetsuya Iwata , Koji Sawamura
CPC classification number: C21D9/46 , C21D1/26 , C21D9/561 , C21D9/562 , C22C38/02 , C23C2/06 , C23C2/40
Abstract: A method for producing a hot-dip galvanized steel sheet includes supplying humidified gas to the soaking zone 12 in a manner such that: in passes in which the steel sheet moves upward, the humidified gas is supplied from first humidified gas supply ports 40A to 40E provided at positions higher by 1.0 m or more and 5.0 m or less than the centers of lower hearth rolls 54 and overlapping the steel sheet in the passes when viewed from the side of the soaking zone; and in passes in which the steel sheet moves downward, the humidified gas is supplied from second humidified gas supply ports 42A to 42E provided at positions lower by 1.0 m or more and 5.0 m or less than the centers of the upper hearth rolls 52 and overlapping the steel sheet in the passes when viewed from the side of the soaking zone.
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8.发明授权公开(公告)号：US11459631B2
公开(公告)日：2022-10-04
申请号：US16605305
申请日：2018-02-19
Applicant: JFE STEEL CORPORATION
Inventor： Gentaro Takeda , Yoichi Makimizu , Yoshikazu Suzuki , Yoshimasa Himei , Hideyuki Takahashi
IPC: C21D9/46 , C21D1/26 , C21D1/74 , C21D8/02 , C21D9/00 , C22C38/02 , C23C2/00 , C23C2/06 , C23C2/26 , C23C2/40
Abstract: Provided is a method for producing a galvannealed steel sheet. When the steel sheet passing through the soaking zone is a type of steel containing 0.2 mass % or more of Si, both dry gas and humidified gas are supplied to the soaking zone, where the humidified gas is supplied only from the humidified gas supply port positioned in a latter part of the soaking zone among a plurality of humidified gas supply ports, where the latter part of the soaking zone is determined considering a sheet passing speed V and a target temperature T on the exit side of the soaking zone.
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公开(公告)号：US10760144B2
公开(公告)日：2020-09-01
申请号：US15531081
申请日：2015-09-01
Applicant: JFE STEEL CORPORATION
Inventor： Soshi Yoshimoto , Masaru Miyake , Gentaro Takeda
Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf−150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.
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公开(公告)号：US10752975B2
公开(公告)日：2020-08-25
申请号：US15318673
申请日：2015-06-05
Applicant: JFE STEEL CORPORATION
Inventor： Gentaro Takeda , Masaru Miyake , Yoichi Makimizu , Yoshitsugu Suzuki , Yoshikazu Suzuki
Abstract: A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a height direction so that a dew point measured in a region of upper ⅕ of the soaking zone in the height direction and a dew point measured in a region of lower ⅕ of the soaking zone in the height direction are both 20° C. or more and 0° C. or less.
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