公开(公告)号：US11850821B2

公开(公告)日：2023-12-26

申请号：US17425847

申请日：2019-12-26

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Minoru Tanaka ,  Kenji Tsuzumi ,  Shingo Arakawa ,  Michitaka Sakurai

IPC: C21D6/00 ,  B32B15/01 ,  B21B3/02 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/26 ,  C23C2/28 ,  C25D3/22

CPC classification number: B32B15/015 ,  B21B3/02 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/024 ,  C23C2/0224 ,  C23C2/26 ,  C23C2/28 ,  C21D2211/008 ,  C25D3/22

Abstract: A hot-pressed member has a predetermined chemical composition. In the hot-pressed member, a steel sheet has a microstructure in which a prior austenite average grain diameter is 8 μm or less, and martensite is present in a volume fraction of 95% or greater in a region within 30 μm of a surface; a Ni diffusion region having a thickness of 0.5 μm or greater exists in a surface layer; a standard deviation of Vickers hardness values is 35 or less; Mndif (mass %) in a sheet thickness direction ≤0.20, where Mndif (mass %) is a degree of Mn segregation; and a tensile strength is 1780 MPa or greater.

公开(公告)号：US10023933B2

公开(公告)日：2018-07-17

申请号：US15116066

申请日：2015-01-30

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki

IPC: C22C38/02 ,  C22C38/04 ,  B32B15/00 ,  C21D9/46 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/561 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A galvannealed steel sheet having a galvanized layer on a surface thereof is provided, having a composition which contains C: 0.10% to 0.35%, Si: 0.3% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less on a mass basis, the remainder being Fe and incidental impurities. The steel sheet has a SiC/SiO2 ratio of more than 0.20, the SiC/SiO2 ratio being a ratio of SiC amount to SiO2 amount at a depth of 1 μm or less in the steel sheet from an interface between the steel sheet and the galvanized layer, and Fe in the galvanized layer constitutes 8% to 13% by mass.

公开(公告)号：US09932659B2

公开(公告)日：2018-04-03

申请号：US15021518

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C22C38/34 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C23C2/40 ,  C21D1/74 ,  C21D1/76 ,  C21D8/02 ,  C21D9/56 ,  C21D1/52 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23C2/36 ,  B32B15/01 ,  C22C18/00 ,  C22C38/16 ,  C22C38/38 ,  C22C38/54 ,  C22C38/58

CPC classification number: C22C38/34 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/36 ,  C23C2/40

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition containing, on a mass basis: C: 0.08% or more and less than 0.20%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 5 μm or less, the decarburized layer having a thickness of 20 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

公开(公告)号：US20160222500A1

公开(公告)日：2016-08-04

申请号：US15021508

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C23C2/40 ,  C23C2/02 ,  C23C2/28 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C21D1/52 ,  C23C2/06

CPC classification number: C23C2/40 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/285 ,  C23C8/10 ,  C23C8/26 ,  C23C8/34

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition including, on a mass basis: C: 0.20% to 0.50%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 4 μm or less on a ferrite side from an interface between ferrite and a galvanized layer, the decarburized layer having a thickness of 16 μm or less on the ferrite side from the interface between the ferrite and the galvanized layer, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

Abstract translation: 一种热镀锌钢板，具有外观好，对涂料的良好粘附性，所述热浸镀锌钢板具有质量比：C：0.20〜0.50％，Si：0.1〜3.0％ ，Mn：0.5〜3.0％，P：0.001〜0.10％，Al：0.01〜3.00％，S：0.200％以下，剩余部分为Fe和杂质，其中，热浸镀锌钢板包括 内部氧化层和脱碳层，铁氧体侧的铁素体侧的内部氧化层的厚度为4μm以下，铁素体层的厚度为16μm以下的脱碳层 从铁氧体和镀锌层之间的界面，内部氧化层的面积为50％以上，由含有Fe和/或Mn的Si氧化物构成，Fe和/或Mn以Fe2XMn2-2XSiOY表示，其中X为0〜1， Y为3或4。

公开(公告)号：US12157924B2

公开(公告)日：2024-12-03

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 ,  C21D7/02 ,  C21D8/02 ,  C22C18/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23C2/26 ,  C23C2/06 ,  C25D3/22 ,  C25D5/48

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：US20220118741A1

公开(公告)日：2022-04-21

申请号：US17425847

申请日：2019-12-26

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Minoru Tanaka ,  Kenji Tsuzumi ,  Shingo Arakawa ,  Michitaka Sakurai

IPC: B32B15/01 ,  B21B3/02 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/16 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

Abstract: A hot-pressed member has a predetermined chemical composition. In the hot-pressed member, a steel sheet has a microstructure in which a prior austenite average grain diameter is 8 μm or less, and martensite is present in a volume fraction of 95% or greater in a region within 30 μm of a surface; a Ni diffusion region having a thickness of 0.5 μm or greater exists in a surface layer; a standard deviation of Vickers hardness values is 35 or less; Mndif (mass %) in a sheet thickness direction ≤0.20, where Mndif (mass %) is a degree of Mn segregation; and a tensile strength is 1780 MPa or greater.

公开(公告)号：US20170166989A1

公开(公告)日：2017-06-15

申请号：US15116066

申请日：2015-01-30

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki

IPC: C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/58

CPC classification number: C21D9/46 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/561 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A galvannealed steel sheet having a galvanized layer on a surface thereof is provided, having a composition which contains C: 0.10% to 0.35%, Si: 0.3% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less on a mass basis, the remainder being Fe and incidental impurities. The steel sheet has a SiC/SiO2 ratio of more than 0.20, the SiC/SiO2 ratio being a ratio of SiC amount to SiO2 amount at a depth of 1 μm or less in the steel sheet from an interface between the steel sheet and the galvanized layer, and Fe in the galvanized layer constitutes 8% to 13% by mass.

公开(公告)号：US09677148B2

公开(公告)日：2017-06-13

申请号：US14649760

申请日：2013-11-29

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Mai Miyata ,  Yasunobu Nagataki

IPC: C23C2/02 ,  C21D9/46 ,  C23C2/40 ,  C21D6/00 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C23C2/06 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C22C38/60 ,  C21D1/74 ,  C21D9/56

CPC classification number: C21D9/46 ,  C21D1/74 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/561 ,  C22C18/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A method for manufacturing a galvanized steel sheet includes heating a base steel sheet in a heating zone such that the surface of the base steel sheet is heated at a temperature of 600° C. or higher and 790° C. or lower while a furnace temperature T° C. in the heating zone of an annealing furnace is controlled based on the water vapor partial pressure PH2Oin Air of air fed into the heating zone, the base steel sheet having a chemical composition consisting of, by mass %, C: 0.05% or more and 0.25% or less, Si: 0.1% or more and 3.0% or less, Mn: 0.5% or more and 3.0% or less, P: 0.001% or more and 0.10% or less, Al: 0.01% or more and 3.00% or less, S: 0.200% or less, and the balance being Fe and inevitable impurities, heating the base steel sheet in the heating zone such that the surface of the base steel sheet is heated at a temperature of 630° C. or higher and 850° C. or lower in an atmosphere containing hydrogen gas having a partial pressure PH2O of 1000 Pa or more and 50000 Pa or less, water vapor gas having a partial pressure PH2O of 610 Pa or less, and the balance being N2 and inevitable impurities, and galvanizing the base steel sheet.

公开(公告)号：US09873934B2

公开(公告)日：2018-01-23

申请号：US15021508

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C23C2/40 ,  C23C2/02 ,  C23C2/06 ,  C21D9/56 ,  C22C18/04 ,  C22C38/00 ,  C23C8/10 ,  C23C8/26 ,  C23C8/34 ,  C21D1/74 ,  C21D1/76 ,  C21D8/02 ,  C21D1/52 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/28 ,  B32B15/01 ,  C22C18/00 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/44 ,  C22C38/54

CPC classification number: C23C2/40 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/285 ,  C23C8/10 ,  C23C8/26 ,  C23C8/34

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition including, on a mass basis: C: 0.20% to 0.50%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 4 μm or less, the decarburized layer having a thickness of 16 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

公开(公告)号：US12215405B2

公开(公告)日：2025-02-04

申请号：US17432218

申请日：2020-01-17

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Minoru Tanaka ,  Yoshie Obata ,  Michitaka Sakurai

IPC: C21D9/48 ,  B32B15/01 ,  C21D6/00 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C21D9/00 ,  C23C2/06 ,  C23C2/40

Abstract: Provided is a hot-pressed member that combines both high strength of 1850 MPa or more in TS and excellent delayed fracture resistance. A hot-pressed member comprises: a predetermined chemical composition; a microstructure in which a prior austenite average grain size is 8 μm or less, a volume fraction of martensite is 95% or more, and a volume fraction of granular carbide of 0.1 μm or more in grain size is 0.10% to 4.0%; a Ni diffusion region of 2.0 μm or more in a depth direction in a surface layer; and a tensile strength of 1850 MPa or more.