公开(公告)号：US20240400851A1

公开(公告)日：2024-12-05

申请号：US18698095

申请日：2022-06-17

Applicant: JFE Steel Corporation

Inventor： Shinichi Furuya ,  Takeshi Matsuda ,  Tomohiro Aoyama ,  Shun Koibuchi

IPC: C09D125/14 ,  B05D7/14 ,  C09D5/08 ,  C09D191/06

Abstract: A lubricating film-coated steel sheet to be subjected to complicated forming is disclosed. The organic resin film contains an acrylic resin having a glass transition point (Tg) of 100° C. or higher and an acid value ratio R=acid value (mg-KOH/g)/Tg (° C.) of 1.50 or more, and 5 mass % or more of a polyolefin wax having a melting point of 100° C. or higher and 145° C. or lower and an average particle diameter of 3.0 μm or less, and is formed on a surface of a steel sheet at a coating weight, W, of 0.3 g/m2 or more and 2.5 g/m2 or less per surface.

公开(公告)号：US12116648B2

公开(公告)日：2024-10-15

申请号：US17042388

申请日：2019-03-20

Applicant: JFE Steel Corporation

Inventor： Hiroyuki Masuoka ,  Shinichi Furuya ,  Akira Matsuzaki ,  Hayato Takeyama

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C23C28/04

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C23C28/04

Abstract: An object is to provide a cold-rolled steel sheet having excellent phosphatability, even in the case where a phosphating solution has a low temperature, and a method for manufacturing the steel sheet, and a cold-rolled steel sheet for annealing.
A cold-rolled steel sheet for annealing has a chemical composition containing C: 0.01 mass % to 0.30 mass %, Si: less than 0.10 mass % (including 0.0 mass %), Mn: 2.0 mass % to 3.5 mass %, P: 0.05 mass % or less, S: 0.01 mass % or less, and Al: 0.15 mass % or less, the balance being Fe and inevitable impurities, in which Si and/or Si oxide exists on a surface of the steel sheet with an average coating thickness of 1 nm to 20 nm.

公开(公告)号：US10443116B2

公开(公告)日：2019-10-15

申请号：US16082632

申请日：2017-02-16

Applicant: JFE Steel Corporation

Inventor： Katsuya Hoshino ,  Shinichi Furuya ,  Takeshi Matsuda ,  Kazuaki Tsuchimoto ,  Akira Matsuzaki

IPC: C23C22/06 ,  C23C22/53 ,  C23C22/83 ,  C23C2/06 ,  C23C22/34 ,  C23C2/26 ,  C23C22/82

Abstract: Provided is a method for manufacturing a zinc-based coated steel sheet having excellent press formability. The method includes an oxide layer-forming step of bringing the zinc-based coated steel sheet into contact with an acidic solution, holding the zinc-based coated steel sheet for 1 second to 60 seconds, and then water-washing the zinc-based coated steel sheet and a neutralization step of holding a zinc-based oxide layer formed in the oxide layer-forming step for 0.5 seconds or more in such a state that a surface of the zinc-based oxide layer is in contact with an alkaline aqueous solution, water-washing the zinc-based oxide layer, and then drying the zinc-based oxide layer. The acidic solution contains HF2Na and/or HF2K in a total amount of 0.10 g/L to 5.0 g/L.

公开(公告)号：US20190017156A1

公开(公告)日：2019-01-17

申请号：US16065867

申请日：2016-12-26

Applicant: JFE Steel Corporation

Inventor： Kenji Kawamura ,  Yoshihiko Ono ,  Nobusuke Kariya ,  Shinichi Furuya ,  Kohei Hasegawa

IPC: C22C38/60 ,  C22C38/00 ,  C22C38/08 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/02 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21C7/10 ,  C21D9/46 ,  C21D8/02

Abstract: Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 μm from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 μm from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 1000 or less/100 mm2, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 μm or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof.

公开(公告)号：US20240101920A1

公开(公告)日：2024-03-28

申请号：US18038753

申请日：2021-10-22

Applicant: JFE Steel Corporation

Inventor： Shinichi Furuya ,  Tomohiro Aoyama ,  Shun Koibuchi ,  Takeshi Matsuda

IPC: C10M111/04 ,  C10M101/02 ,  C10M107/26 ,  C10M107/28 ,  C10M107/34 ,  C10M107/38 ,  C10M107/44

CPC classification number: C10M111/04 ,  C10M101/025 ,  C10M107/26 ,  C10M107/28 ,  C10M107/34 ,  C10M107/38 ,  C10M107/44 ,  C10M2205/0225 ,  C10M2209/0625 ,  C10M2209/0845 ,  C10M2209/1013 ,  C10M2209/1023 ,  C10M2209/1033 ,  C10M2213/0623 ,  C10M2217/0453 ,  C10N2050/02

Abstract: A steel sheet having a film containing an organic resin and a wax on at least one surface of the steel sheet, in which the organic resin is at least one of an acryl-based resin, an epoxy-based resin, a urethane-based resin, a phenol-based resin, a vinyl acetate-based resin, and a polyester-based resin, in which the wax is a polyolefin wax having a melting temperature of 120° C. or higher and 140° C. or lower and an average particle size of 3.0 μm or less, in which a proportion of the wax in the film is 10 mass % or more, and in which a coating weight per side W (g/m2) of the film and an arithmetic average roughness Ra (μm) of the steel sheet satisfy relational expression (1) below.


W≥0.12×Ra2+0.2  (1)

公开(公告)号：US20210115530A1

公开(公告)日：2021-04-22

申请号：US17042388

申请日：2019-03-20

Applicant: JFE Steel Corporation

Inventor： Hiroyuki Masuoka ,  Shinichi Furuya ,  Akira Matsuzaki ,  Hayato Takeyama

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/02 ,  C23C28/04

Abstract: An object is to provide a cold-rolled steel sheet having excellent phosphatability, even in the case where a phosphating solution has a low temperature, and a method for manufacturing the steel sheet, and a cold-rolled steel sheet for annealing.
A cold-rolled steel sheet for annealing has a chemical composition containing C: 0.01 mass % to 0.30 mass %, Si: less than 0.10 mass % (including 0.0 mass %), Mn: 2.0 mass % to 3.5 mass %, P: 0.05 mass % or less, S: 0.01 mass % or less, and Al: 0.15 mass % or less, the balance being Fe and inevitable impurities, in which Si and/or Si oxide exists on a surface of the steel sheet with an average coating thickness of 1 nm to 20 nm.

公开(公告)号：US10941471B2

公开(公告)日：2021-03-09

申请号：US16065867

申请日：2016-12-26

Applicant: JFE Steel Corporation

Inventor： Kenji Kawamura ,  Yoshihiko Ono ,  Nobusuke Kariya ,  Shinichi Furuya ,  Kohei Hasegawa

IPC: C22C38/60 ,  C21D9/46 ,  C21C7/10 ,  C22C38/06 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B22D11/00 ,  B22D11/116 ,  B22D11/113 ,  C23C2/28 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 μm from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 μm from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 1000 or less/100 mm2, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 μm or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof.

公开(公告)号：US10907255B2

公开(公告)日：2021-02-02

申请号：US16499419

申请日：2018-02-01

Applicant: JFE STEEL CORPORATION

Inventor： Shinichi Furuya ,  Akira Matsuzaki ,  Hiroyuki Masuoka ,  Katsuya Hoshino

IPC: B32B15/04 ,  C23C28/00 ,  C23C2/06 ,  C23C2/26 ,  C23C22/53 ,  C23C22/83 ,  B05D1/18 ,  B05D7/14 ,  C23C22/06 ,  B05D7/00 ,  C23C30/00 ,  B05D1/00 ,  B32B15/01 ,  C23C22/07 ,  B32B15/18 ,  B32B15/08 ,  C23C2/40 ,  B32B15/085

Abstract: There is provided a high-strength galvanized steel sheet and a relatively low-strength galvanized steel sheet that undergoes complex forming, a galvanized steel sheet that exhibits consistently excellent press formability and that generates no hazardous fumes during welding as well as a manufacturing method therefor. The galvanized steel sheet has an oxide layer on the surface, where the oxide layer has an average thickness of 20 nm or more, and the oxide layer contains 30 mg/m2 or more of Zn, 1.0 mg/m2 or more of S, and 50 mg/m2 or more and 1,000 mg/m2 or less of polyethylene particles having an average particle size of 5.0 μm or less.

公开(公告)号：US20190093206A1

公开(公告)日：2019-03-28

申请号：US16082632

申请日：2017-02-16

Applicant: JFE Steel Corporation

Inventor： Katsuya Hoshino ,  Shinichi Furuya ,  Takeshi Matsuda ,  Kazuaki Tsuchimoto ,  Akira Matsuzaki

IPC: C23C2/06 ,  C23C2/26 ,  C23C22/34 ,  C23C22/82

CPC classification number: C23C2/06 ,  C23C2/26 ,  C23C22/34 ,  C23C22/82

Abstract: Provided is a method for manufacturing a zinc-based coated steel sheet having excellent press formability. The method includes an oxide layer-forming step of bringing the zinc-based coated steel sheet into contact with an acidic solution, holding the zinc-based coated steel sheet for 1 second to 60 seconds, and then water-washing the zinc-based coated steel sheet and a neutralization step of holding a zinc-based oxide layer formed in the oxide layer-forming step for 0.5 seconds or more in such a state that a surface of the zinc-based oxide layer is in contact with an alkaline aqueous solution, water-washing the zinc-based oxide layer, and then drying the zinc-based oxide layer. The acidic solution contains HF2Na and/or HF2K in a total amount of 0.10 g/L to 5.0 g/L.

公开(公告)号：US20170314138A1

公开(公告)日：2017-11-02

申请号：US15526140

申请日：2015-11-09

Applicant: JFE STEEL CORPORATION

Inventor： Katsuya Hoshino ,  Shoichiro Taira ,  Shinichi Furuya

IPC: C23C22/83 ,  C23C22/60

CPC classification number: C23C22/83 ,  C23C22/53 ,  C23C22/60 ,  C23C22/78 ,  C23G1/20

Abstract: A steel sheet coated with a zinc-based coating layer having a reaction layer on the surface of the steel sheet is manufactured by a method that includes bringing a steel sheet coated with a zinc-based coating layer into contact for 1.0 second or more with an alkaline aqueous solution containing one or more chelating agents selected from among sodium gluconate, sodium glucoheptonate, sodium citrate, tartaric acid, arabonic acid, galactonic acid, sorbit, mannite, glycerin, EDTA, and sodium tripolyphosphate in a total amount of 0.050 mass % or more and having a pH of 10.0 or more as a pre-treatment before a formation of the reaction layer, and forming the reaction layer being an oxide layer containing a crystal-structured substance expressed by Zn4(SO4)1-X(CO3)X(OH)6.nH2O.