公开(公告)号：US20230392226A1

公开(公告)日：2023-12-07

申请号：US18032298

申请日：2021-08-18

Applicant: JFE STEEL CORPORATION

Inventor： Shuhei OGAWA ,  Minoru TANAKA ,  Rinta SATO ,  Daisuke MIZUNO ,  Seiji NAKAJIMA

IPC: C21D9/46 ,  C21D8/02 ,  C22C18/04 ,  C21D7/02 ,  C22C38/60 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D8/0205 ,  C22C18/04 ,  C21D7/02 ,  C22C38/60 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0221 ,  C21D8/0247 ,  C21D8/0278 ,  C25D3/22

Abstract: A hot-pressed member, a steel sheet for hot pressing, and methods for producing the hot-pressed member and the steel sheet for hot pressing. The hot-pressed member includes a steel sheet and a Zn-based alloy coated layer disposed on at least one surface of the steel sheet. The Zn-based alloy coated layer includes a solid solution phase including Zn with the balance being Fe and incidental impurities, an intermetallic compound phase including Fe with the balance being Zn and incidental impurities, and an oxide layer including Zn. The oxide layer serves as an uppermost layer of the Zn-based alloy coated layer and splits the intermetallic compound phase. The split density in at least one cross-section of the oxide layer per unit cross-section is 10 split positions/mm or more.

公开(公告)号：US20200370140A1

公开(公告)日：2020-11-26

申请号：US16620615

申请日：2018-03-30

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi TAKASHIMA ,  Takashi KOBAYASHI ,  Yoshimasa FUNAKAWA ,  Seiji NAKAJIMA

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C23C30/00 ,  B21D22/02

Abstract: Disclosed is a hot-pressed member that can exhibit very high tensile strength after hot pressing as high as TS: 1780 MPa or more, and excellent indentation peeling strength at projection welds by properly adjusting its chemical composition and its microstructure such that a prior austenite average grain size is 7 μm or less within a range of 50 μm or less in a thickness direction from a surface of the member, a volume fraction of martensite is 90% or more, and an average intergrain distance of Nb and Ti carbonitrides having a grain size of less than 0.10 μm within a depth range of 20 μm to 100 μm in the thickness direction from the surface of the member is 5 μm or less.

公开(公告)号：US20200172991A1

公开(公告)日：2020-06-04

申请号：US16616602

申请日：2018-03-30

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi TAKASHIMA ,  Takashi KOBAYASHI ,  Yoshimasa FUNAKAWA ,  Seiji NAKAJIMA

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/16 ,  C22C38/08 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C23C2/12 ,  C23C2/06 ,  C23C2/40 ,  B32B15/01 ,  C25D3/54 ,  C25D3/22 ,  C25D3/56 ,  B21D22/20 ,  B21K29/00

Abstract: Disclosed is a hot-pressed member that can exhibit very high tensile strength after hot pressing, excellent delayed fracture resistance, and high tensile shear stress after resistance spot welding by properly adjusting its chemical composition and its microstructure such that at least 20 Nb-based precipitates having a grain size of less than 0.10 μm are present on average per 100 μm2 of a cross section parallel to a thickness direction of the member, a prior austenite average grain size is 8 μm or less, an average aspect ratio of prior austenite grains is 2.5 or less, and a volume fraction of martensite is 90% or more, and such that a standard deviation of Vickers hardness measured every 200 μm on a surface of the member is 40 or less.

公开(公告)号：US20160158822A1

公开(公告)日：2016-06-09

申请号：US14899319

申请日：2014-05-13

Applicant: JFE STEEL CORPORATION

Inventor： Seiji NAKAJIMA ,  Minako MORIMOTO ,  Satoru ANDO

IPC: B21D22/02 ,  C22C38/60 ,  C22C38/32 ,  C22C38/00 ,  C22C38/18 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C18/00 ,  C22C38/28

CPC classification number: B21D22/022 ,  C21D8/0278 ,  C22C18/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C25D3/565 ,  C25D5/50

Abstract: Provided is a hot-pressed member excellent in terms of paint adhesiveness and a method of manufacturing the hot-pressed member. A hot-pressed member has a coating layer containing Zn and Ni on the surface of a steel sheet of which the member is formed, an oxide film containing Zn on the coating layer, and a void formation rate is 80% or less for voids formed between the coating layer and the oxide film.

Abstract translation: 提供了一种在涂料粘附性方面优异的热压构件和制造该热压构件的方法。 热压部件在其形成的钢板的表面上具有含有Zn和Ni的涂层，在涂层上含有Zn的氧化膜，空隙形成率为80％以下 在涂层和氧化膜之间。

公开(公告)号：US20150337415A1

公开(公告)日：2015-11-26

申请号：US14438993

申请日：2013-10-28

Applicant: JFE STEEL CORPORATION

Inventor： Tatsuya MIYOSHI ,  Seiji NAKAJIMA ,  Satoru ANDO

IPC: C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  B21D37/16 ,  C22C38/32 ,  C22C38/34 ,  C22C38/28 ,  C22C38/60 ,  C22C38/04 ,  C22C38/38

CPC classification number: C22C38/06 ,  B21D37/16 ,  B32B15/013 ,  C21D1/18 ,  C21D1/673 ,  C21D9/00 ,  C22C18/00 ,  C22C18/04 ,  C22C19/03 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/26 ,  C23C2/40 ,  C23C28/00 ,  C25D3/562 ,  C25D3/565 ,  C25D5/10 ,  C25D5/14 ,  C25D5/48 ,  C25D5/50 ,  C25D7/0614 ,  Y10T428/12569

Abstract: A steel sheet for hot press-forming includes a zinc coating layer and a Si-containing compound layer in this order on a base steel sheet, wherein the Si-containing compound layer contains a silicone resin having an organic functional group of a carbon number of 4 or more.

Abstract translation: 用于热压成型的钢板在基材钢板上依次包括锌涂层和含Si化合物层，其中含Si化合物层含有具有碳数为6的有机官能团的硅树脂 4以上。

公开(公告)号：US20180216219A1

公开(公告)日：2018-08-02

申请号：US15747880

申请日：2016-07-05

Applicant: JFE STEEL CORPORATION

Inventor： Seiji NAKAJIMA ,  Satoru ANDO

IPC: C23C2/26 ,  B21D22/26 ,  C21D9/46 ,  C23C2/06 ,  C23C2/40 ,  C25D5/50 ,  C23F17/00 ,  C22C18/00

CPC classification number: C23C2/26 ,  B21D22/20 ,  B21D22/26 ,  B21D53/88 ,  C21D8/0278 ,  C21D9/46 ,  C22C18/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40 ,  C23F17/00 ,  C25D3/22 ,  C25D5/48 ,  C25D5/50

Abstract: A method for manufacturing a hot-pressed member The method includes heating a zinc-based coated steel sheet to a temperature range from an Ac3 transformation temperature to 1000° C., performing hot pressing work, and performing cooling, in which a surface-cleaning treatment is performed on the zinc-based coated steel sheet before the heating step is performed.

公开(公告)号：US20180030568A1

公开(公告)日：2018-02-01

申请号：US15551375

申请日：2016-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Yasuaki OKITA ,  Rinsei IKEDA ,  Seiji NAKAJIMA ,  Koichi NAKAGAWA

IPC: C21D9/50 ,  B23K10/02 ,  B23K26/21 ,  B23K9/16 ,  B23K9/167 ,  C22C38/00 ,  C22C38/60 ,  C22C38/28 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  B21D22/20 ,  B23K26/348

CPC classification number: C21D9/50 ,  B21D22/20 ,  B21D22/208 ,  B21D53/88 ,  B23K9/16 ,  B23K9/167 ,  B23K9/23 ,  B23K10/02 ,  B23K26/21 ,  B23K26/348 ,  B23K31/00 ,  B23K2103/08 ,  C21D1/18 ,  C21D9/00 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40

Abstract: A hot-pressed member is formed using a tailored blank material obtained by butt joining respective ends of two or more coated steel sheets. The hot-pressed member has two or more sites formed by the respective coated steel sheets and at least one joining portion between the sites. Depending on a type of a coated layer of each of the coated steel sheets, tw/t0 is appropriately controlled where tw is a thickness of a thinnest portion in the joining portion and t0 is a thickness of a thinnest site of the sites. A tensile strength of each of the sites is 1180 MPa or more.

公开(公告)号：US20160151822A1

公开(公告)日：2016-06-02

申请号：US14901754

申请日：2014-06-02

Applicant: JFE Steel Corporation

Inventor： Seiji NAKAJIMA ,  Minako MORIMOTO ,  Satoru ANDO

IPC: B21D22/20 ,  C22C38/28 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C25D5/50 ,  C22C38/00 ,  C22C38/60 ,  C21D1/673 ,  C21D9/46 ,  C25D5/14 ,  C22C38/32 ,  C22C38/02

CPC classification number: B21D22/208 ,  B32B15/013 ,  C21D1/18 ,  C21D1/673 ,  C21D9/46 ,  C21D2251/02 ,  C22C18/00 ,  C22C19/03 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C25D5/14 ,  C25D5/50 ,  C25D7/0614

Abstract: A method of manufacturing a hot-pressed member including heating a coated steel sheet to 850° C. to 950° C., the coated steel sheet including a substrate steel sheet and a coating layer formed on the substrate steel sheet and containing 10% to 25% by mass of Ni and the balance being Zn and incidental impurities, in which the coating weight of the coating layer is 10 to 90 g/m2 per a side; and starting hot press forming when the temperature of the coated steel sheet which has been heated is 650° C. to 800° C.

Abstract translation: 一种制造包括将涂覆钢板加热至850℃至950℃的热压部件的方法，所述涂覆钢板包括基材钢板和形成在基材钢板上的涂层，并且含有10％至 Ni为25质量％，其余为Zn和附带杂质，其中涂层的涂层重量为每侧10〜90g / m 2; 当被加热的被覆钢板的温度为650〜800℃时开始热压成形。