公开(公告)号：US11795520B2

公开(公告)日：2023-10-24

申请号：US17432349

申请日：2019-11-21

Applicant: JFE STEEL CORPORATION

Inventor： Shimpei Yoshioka ,  Yoshihiko Ono ,  Katsutoshi Takashima ,  Takayuki Futatsuka ,  Kentaro Sato

IPC: C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C23C2/02 ,  C21D9/48 ,  B32B15/01 ,  C21D6/00 ,  C22C38/00 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/40 ,  C23C2/12

CPC classification number: C21D9/48 ,  B32B15/012 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/40 ,  C21D2211/008 ,  C23C2/06 ,  C23C2/12

Abstract: A hot-pressed member having excellent bending collapsibility, a method for manufacturing the same, and a method for manufacturing a steel sheet for the hot-pressed member. The hot-pressed member includes a steel sheet as a base material, the steel sheet having a specified chemical composition. The hot-pressed member has a microstructure in which a martensite microstructure is present in a volume fraction of 70% or greater, and a number density of inclusions having a longest diameter of 25 μm or greater is 0.02/mm2 or less. The hot-pressed member has a tensile strength of 1.8 GPa or greater.

公开(公告)号：US10590504B2

公开(公告)日：2020-03-17

申请号：US15535175

申请日：2015-10-27

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Kohei Hasegawa ,  Yoshimasa Funakawa

IPC: C21D9/46 ,  C22C38/14 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C21D8/04 ,  C21D1/28 ,  C22C38/18 ,  C21D9/48 ,  C21D6/00 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

Abstract: A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 μm or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 μm or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 μm or less, in which a relational expression, 0.35≤V2/V1≤0.75 (1), is satisfied, where V1 is a volume fraction of phases which are different from ferrite and V2 is a volume fraction of tempered martensite.

公开(公告)号：US20190085421A1

公开(公告)日：2019-03-21

申请号：US16089096

申请日：2017-03-21

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Yoshimasa Funakawa

IPC: C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: Provided herein is a plated steel having high strength with excellent elongation, excellent hole expansibility, and excellent material uniformity, and a method for producing such a plated steel. The steel sheet provided herein has a specific composition, and a steel structure that contains ferrite as a primary phase, and 2 to 12% of perlite, and 3% or less of martensite by volume, and in which the remainder is a low-temperature occurring phase. The ferrite has an average crystal grain diameter of 25 μm or less. The perlite has an average crystal grain diameter of 5 μm or less. The martensite has an average crystal grain diameter of 1.5 μm or less. The perlite has a mean free path of 5.5 μm or more. The steel sheet has a tensile strength of 440 MPa or more.

公开(公告)号：US10174396B2

公开(公告)日：2019-01-08

申请号：US15115138

申请日：2015-01-21

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Kohei Hasegawa

IPC: C21D1/20 ,  C21D1/22 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58

Abstract: A high-strength cold-rolled steel sheet has a chemical composition containing, by mass %, C: 0.15% or more and 0.30% or less, Si: 0.8% or more and 2.4% or less, Mn: 2.4% or more and 3.5% or less, P: 0.08% or less, S: 0.005% or less, Al: 0.01% or more and 0.08% or less, N: 0.010% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0002% or more and 0.0050% or less, and the balance being Fe and inevitable impurities, a microstructure including ferrite having an average grain diameter of 3 μm or less and a volume fraction of 5% or less (including 0%), retained austenite having a volume fraction of 10% or more and 20% or less, martensite having an average grain diameter of 4 atm or less and a volume fraction of 20% or less (including 0%), and the balance including bainite and/or tempered martensite.

公开(公告)号：US09994941B2

公开(公告)日：2018-06-12

申请号：US14363171

申请日：2012-12-03

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Kohei Hasegawa

IPC: C22C38/02 ,  C22C38/04 ,  C21D8/02 ,  C21D9/46 ,  C22C38/34 ,  C22C38/06 ,  C22C38/58 ,  C22C38/00 ,  C22C38/12 ,  C22C38/14 ,  C21D8/04 ,  C22C38/08 ,  C22C38/16

CPC classification number: C22C38/34 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0436 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/58

Abstract: A high strength cold rolled steel sheet has a chemical composition including, by mass %, C: 0.06 to 0.13%, Si: 1.2 to 2.3%, Mn: 0.6 to 1.6%, P: not more than 0.10%, S: not more than 0.010%, Al: 0.01 to 0.10% and N: not more than 0.010%, the balance comprising Fe and inevitable impurities. The steel sheet includes a microstructure containing not less than 90% in terms of volume fraction of ferrite with an average grain diameter of less than 20 μm and 1.0 to 10% in terms of volume fraction of pearlite with an average grain diameter of less than 5 μm. The ferrite has an average Vickers hardness of not less than 130. The steel sheet has a yield ratio of not less than 65% and a tensile strength of not less than 590 MPa.

公开(公告)号：US20160369369A1

公开(公告)日：2016-12-22

申请号：US15115138

申请日：2015-01-21

Applicant: JFE STEEL CORPORATION

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Kohei Hasegawa

IPC: C21D9/46 ,  C22C38/32 ,  C22C38/28 ,  C22C38/16 ,  C22C38/14 ,  C21D8/02 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/38 ,  C22C38/12

CPC classification number: C21D9/46 ,  C21D1/20 ,  C21D1/22 ,  C21D8/0221 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58

Abstract: A high-strength cold-rolled steel sheet has a chemical composition containing, by mass %, C: 0.15% or more and 0.30% or less, Si: 0.8% or more and 2.4% or less, Mn: 2.4% or more and 3.5% or less, P: 0.08% or less, S: 0.005% or less, Al: 0.01% or more and 0.08% or less, N: 0.010% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0002% or more and 0.0050% or less, and the balance being Fe and inevitable impurities, a microstructure including ferrite having an average grain diameter of 3 μm or less and a volume fraction of 5% or less (including 0%), retained austenite having a volume fraction of 10% or more and 20% or less, martensite having an average grain diameter of 4 μm or less and a volume fraction of 20% or less (including 0%), and the balance including bainite and/or tempered martensite.

Abstract translation: 高强度冷轧钢板的化学成分以质量％计含有C：0.15％以上且0.30％以下，Si：0.8％以上且2.4％以下，Mn：2.4％以上， 3.5％以下，P：0.08％以下，S：0.005％以下，Al：0.01％以上且0.08％以下，N：0.010％以下，Ti：0.002％以上且0.05％以下， B：0.0002％以上且0.0050％以下，余量为Fe和不可避免的杂质，具有平均粒径为3μm以下，体积分率为5％以下（含0％）的铁素体的组织， 体积分数为10％以上且20％以下的残余奥氏体，平均粒径为4μm以下，体积分率为20％以下（包括0％）的马氏体，其余为贝氏体和/ 或回火马氏体。

公开(公告)号：US09322091B2

公开(公告)日：2016-04-26

申请号：US14375053

申请日：2013-01-28

Applicant: JFE STEEL CORPORATION

Inventor： Hideyuki Kimura ,  Katsutoshi Takashima ,  Shinjiro Kaneko

IPC: C23C2/02 ,  C21D1/26 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/28 ,  C22C38/26 ,  C22C38/30 ,  C22C38/10 ,  C25D5/36 ,  C25D5/38 ,  C25D5/50 ,  C25D3/22 ,  C23C2/06 ,  C23C2/26 ,  C21D9/46 ,  C22C38/58

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D1/26 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/285 ,  C25D3/22 ,  C25D5/36 ,  C25D5/38 ,  C25D5/50 ,  Y10T428/12799 ,  Y10T428/12972

Abstract: There is provided a high-strength galvanized steel sheet including, on a mass percent basis, C: more than 0.060% and 0.13% or less, Si: 0.01% or more and 0.7% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005% or more and 0.100% or less, N: 0.0100% or less, Nb: 0.005% or more and 0.10% or less, Ti: 0.03% or more and 0.15% or less, and the balance comprising Fe and incidental impurities, satisfying the relationship of (Nb/93+Ti*/48)/(C/12)>0.08 (wherein Ti*=Ti−(48/14)N−(48/32)S). The high-strength galvanized steel sheet has a structure including ferrite and martensite. The ferrite has an average grain diameter of 15 μm or less and an area percentage of 80% or more. The martensite has an area percentage of 1% or more and 15% or less.

Abstract translation: 提供了以质量％计含有C：大于0.060％和0.13％以下，Si：0.01％以上且0.7％以下，Mn：1.0％以上且3.0以下的高强度镀锌钢板 ％以下，P：0.005％以上且0.100％以下，S：0.010％以下，sol.Al：0.005％以上且0.100％以下，N：0.0100％以下，Nb：0.005％以上 和0.10％以下，Ti：0.03％以上且0.15％以下，余量包含Fe和附带杂质，满足（Nb / 93 + Ti * / 48）/（C / 12）> 0.08（ 其中Ti * = Ti-（48/14）N-（48/32）S）。 高强度镀锌钢板具有铁素体和马氏体的结构。 铁素体的平均粒径为15μm以下，面积率为80％以上。 马氏体的面积率为1％以上且15％以下。

公开(公告)号：US20150017472A1

公开(公告)日：2015-01-15

申请号：US14375053

申请日：2013-01-28

Applicant: JFE STEEL CORPORATION

Inventor： Hideyuki Kimura ,  Katsutoshi Takashima ,  Shinjiro Kaneko

IPC: C23C2/02 ,  C21D1/26 ,  C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/60 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D1/26 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/285 ,  C25D3/22 ,  C25D5/36 ,  C25D5/38 ,  C25D5/50 ,  Y10T428/12799 ,  Y10T428/12972

Abstract: There is provided a high-strength galvanized steel sheet including, on a mass percent basis, C: more than 0.060% and 0.13% or less, Si: 0.01% or more and 0.7% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005% or more and 0.100% or less, N: 0.0100% or less, Nb: 0.005% or more and 0.10% or less, Ti: 0.03% or more and 0.15% or less, and the balance comprising Fe and incidental impurities, satisfying the relationship of (Nb/93+Ti*/48)/(C/12)>0.08 (wherein Ti*=Ti−(48/14)N−(48/32)S). The high-strength galvanized steel sheet has a structure including ferrite and martensite. The ferrite has an average grain diameter of 15 μm or less and an area percentage of 80% or more. The martensite has an area percentage of 1% or more and 15% or less.

Abstract translation: 提供了以质量％计含有C：大于0.060％和0.13％以下，Si：0.01％以上且0.7％以下，Mn：1.0％以上且3.0以下的高强度镀锌钢板 ％以下，P：0.005％以上且0.100％以下，S：0.010％以下，sol.Al：0.005％以上且0.100％以下，N：0.0100％以下，Nb：0.005％以上 和0.10％以下，Ti：0.03％以上且0.15％以下，余量包含Fe和附带杂质，满足（Nb / 93 + Ti * / 48）/（C / 12）> 0.08（ 其中Ti * = Ti-（48/14）N-（48/32）S）。 高强度镀锌钢板具有铁素体和马氏体的结构。 铁素体的平均粒径为15μm以下，面积率为80％以上。 马氏体的面积率为1％以上且15％以下。

公开(公告)号：US12221705B2

公开(公告)日：2025-02-11

申请号：US18251269

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Yamamoto ,  Katsutoshi Takashima ,  Mai Aoyama ,  Yusuke Okumura ,  Tomomi Kanazawa ,  Katsuya Hoshino ,  Hiroshi Matsuda ,  Ei Okumura ,  Yoichi Makimizu ,  Masaki Koba

IPC: C23C28/02 ,  C21D1/74 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/26 ,  C23C2/28 ,  C25D3/20 ,  C25D5/36 ,  C23C2/06 ,  C23C2/40

Abstract: Provided is an alloyed galvanized steel sheet with excellent resistance to cracking in resistance welding at a welded portion, even if crystal orientations of an Fe-based electroplating layer and a cold-rolled steel sheet are integrated at a high ratio at the interface between the Fe-based electroplating layer and the cold-rolled steel sheet. The alloyed galvanized steel sheet has a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % to 3.0 mass %; an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface exceeding 20.0 g/m2, and an alloyed galvanized layer formed on the Fe-based electroplating layer, where crystal orientations of the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet are integrated at a ratio of more than 50% at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet.

公开(公告)号：US11939640B2

公开(公告)日：2024-03-26

申请号：US17178518

申请日：2021-02-18

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Yoshimasa Funakawa

IPC: C21D9/46 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02 ,  C23C30/00 ,  C23G1/00 ,  C23G1/08

CPC classification number: C21D9/46 ,  B32B15/01 ,  B32B15/012 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0268 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/024 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C30/00 ,  C23C30/005 ,  C21D8/0236 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C23G1/00 ,  C23G1/08 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972

Abstract: A method for producing a hot-rolled steel sheet, a method for producing a cold-rolled full-hard steel sheet, and a method for producing a heat-treated sheet are provided herein. The methods comprising hot rolling a steel material of a composition comprising, in mass %, C: 0.05 to 0.12%, Si: 0.80% or less, Mn: 1.30 to 2.10%, P: 0.001 to 0.050%, S: 0.005% or less, Al: 0.01 to 0.10%, N: 0.010% or less, one or more selected from Cr in an amount of 0.05 to 0.50%, and Mo in an amount of 0.05 to 0.50%, one or more selected from Ti in an amount of 0.01 to 0.10%, Nb in an amount of 0.01 to 0.10%, and V in an amount of 0.01 to 0.10%, and the balance Fe and unavoidable impurities.