公开(公告)号：US12129535B2

公开(公告)日：2024-10-29

申请号：US17415733

申请日：2019-11-13

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Fusae Shiimori ,  Katsumi Kojima ,  Daisuke Otani

IPC: C22C38/22 ,  B21C47/02 ,  C21D8/02 ,  C21D8/10 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32

CPC classification number: C22C38/22 ,  B21C47/02 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/105 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C21D2211/003 ,  C21D2211/005

Abstract: Provided is a steel sheet for cans. A steel sheet for cans comprises: a chemical composition containing, in mass %, C: 0.010% or more and 0.130% or less, Si: 0.04% or less, Mn: 0.10% or more and 1.00% or less, P: 0.007% or more and 0.100% or less, S: 0.0005% or more and 0.0090% or less, Al: 0.001% or more and 0.100% or less, N: 0.0050% or less, Ti: 0.0050% or more and 0.1000% or less, and Cr: 0.08% or less, and satisfying a relationship 0.005≤(Ti*/48)/(C/12)≤0.700 where Ti*=Ti−1.5S, with a balance consisting of Fe and inevitable impurities; a microstructure in which a proportion of cementite in ferrite grains is 10% or less; and an upper yield strength of 550 MPa or more.

公开(公告)号：US11913087B2

公开(公告)日：2024-02-27

申请号：US16754138

申请日：2018-10-29

Applicant: JFE STEEL CORPORATION

Inventor： Fusae Shiimori ,  Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided is a high-strength steel sheet having excellent ductility, bendability, and TS of 500 MPa or more, in particular, a high-strength thin steel sheet for cans having a sheet thickness of 0.1 to 0.8 mm, the steel sheet having a chemical composition containing C: 0.03-0.15%, Si: 0.01-0.05%, Mn: more than 0.6% and 1.5% or less, P: 0.025% or less, S: 0.02% or less, Al: 0.01-0.10%, N: 0.0005-0.0100%, Ti: 0.005-0.020%, B: 0.0005-0.0100%, and Nb: 0.0050-0.0200% with the balance being Fe and inevitable impurities, in which the steel sheet has a metallic structure containing, in area ratio, 85% or more of ferrite and 1-10% of martensite, the martensite has a grain size of 5 μm or less, and a ratio of martensite having a grain size of 2 μm or less is 80% or more.

公开(公告)号：US11359255B2

公开(公告)日：2022-06-14

申请号：US16628793

申请日：2018-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Takashi Ueno ,  Yoshihide Yamamoto ,  Katsumi Kojima ,  Bungo Tateno

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  B65D41/12

Abstract: A steel sheet for crown cap having: a chemical composition containing, C, Si, Mn, P, S, Al, N, with the balance being Fe and inevitable impurities; a ferrite phase in a region from a depth of ¼ of a sheet thickness to a mid-thickness part, the ferrite phase having a standard deviation of ferrite grain size of 7.0 μm or less; a yield strength of 560 MPa or more and 700 MPa or less in a rolling direction; and a difference of 25 MPa or more between a yield strength in a 2% strain tensile test and a yield strength in a tensile test after heat treatment at 170° C. for 20 minutes, in the rolling direction.

公开(公告)号：US10655201B2

公开(公告)日：2020-05-19

申请号：US15557547

申请日：2016-02-16

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Yoshihiko Ono ,  Yoshimasa Funakawa ,  Kazuma Mori ,  Reiko Sugihara

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/00 ,  C22C38/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: A high-strength, cold-rolled steel sheet having a tensile strength of 980 MPa or more, the steel sheet having a chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.50% to 0.70%, Mn: 2.40% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, Cr: 0.01% to 2.00%, Mo: 0.01% to 1.00%, Ni: 0.01% to 5.00%, Cu: 0.01% to 5.00%, and the balance being Fe and inevitable impurities, a metallurgical microstructure including a ferrite phase in an amount of 30% or more in terms of area fraction, at least one selected from a bainite phase and a martensite phase in an amount of 40% to 65% in total in terms of area fraction, and a cementite in an amount of 5% or less in terms of area fraction at a position located at ¼ of the thickness from the surface of the steel sheet, and a metallurgical microstructure including a ferrite phase in an amount of 40% to 55% in terms of area fraction at a position located at 50 μm in the thickness direction from the surface of the steel sheet and a method for manufacturing the steel sheet.

公开(公告)号：US20180002778A1

公开(公告)日：2018-01-04

申请号：US15542272

申请日：2015-08-28

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Yoshihiko Ono ,  Yoshimasa Funakawa ,  Kazuma Mori ,  Reiko Sugihara ,  Kenji Kawamura

IPC: C21D9/46 ,  B21B1/22 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/08 ,  C22C38/02 ,  C22C38/00 ,  C22C38/38 ,  B21B3/02 ,  C21D6/00 ,  C21D8/02 ,  C23G1/00

Abstract: Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more.

公开(公告)号：US11618932B2

公开(公告)日：2023-04-04

申请号：US16496048

申请日：2018-03-12

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

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

Abstract: A steel sheet for a two-piece can, the steel sheet includes: by mass %, C: 0.010% or more and less than 0.050%; Si: 0.04% or less; Mn: 0.10% or more and less than 0.40%; P: 0.02% or less; S:0.020% or less; Al: more than 0.030% and 0.100% or less; N: 0.0005% or more and less than 0.0030%; B: 0.0005% to 0.0030%; and balance Fe and inevitable impurities, wherein an amount of N that is present as BN and a whole amount of N satisfy the following expression (1): [N as BN]/[N]>0.5  (1), where N as BN represents the amount of N that is present as BN, and N represents the whole amount of N, tensile strength is 420 MPa to 540 MPa, elongation is 5% or more, yield elongation is 3% or less, and Δr is −0.50 to 0.10.

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：US10697039B2

公开(公告)日：2020-06-30

申请号：US15542272

申请日：2015-08-28

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Yoshihiko Ono ,  Yoshimasa Funakawa ,  Kazuma Mori ,  Reiko Sugihara ,  Kenji Kawamura

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/40 ,  C22C38/12 ,  C22C38/04 ,  C22C38/50 ,  C22C38/00 ,  C22C38/18 ,  B21B3/00 ,  C22C38/58 ,  C22C38/14 ,  C22C38/60 ,  B21B1/22 ,  B21B3/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/08 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23G1/00

Abstract: Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more.

公开(公告)号：US20180002777A1

公开(公告)日：2018-01-04

申请号：US15542203

申请日：2015-08-28

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Yoshihiko Ono ,  Yoshimasa Funakawa ,  Kazuma Mori ,  Reiko Sugihara ,  Kenji Kawamura

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/38 ,  C22C38/60

Abstract: Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 30% or more of a ferrite phase, 40% to 65% of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 40% to 55% and the total area ratio of a bainite phase having a grain diameter of more than 5 μm and/or a martensite phase having a grain diameter of more than 5 μm is 20% or less, and a tensile strength is 980 MPa or more.

公开(公告)号：US20140234655A1

公开(公告)日：2014-08-21

申请号：US14346363

申请日：2012-09-27

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Nobusuke Kariya ,  Kohei Hasegawa

IPC: C23C2/02 ,  B32B15/01

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

Abstract: A high-strength hot-dip galvanized steel sheet has excellent workability, namely, excellent ductility and hole expansion formability, and high yield ratio. The steel sheet has a chemical composition containing by mass %: C: 0.05-0.15%; Si: 0.10-0.90%; Mn: 1.0-1.9%; P: 0.005-0.10%; S: 0.0050% or less; Al: 0.01-0.10%; N: 0.0050% or less; Nb: 0.010-0.100%; and the balance being Fe and incidental impurities, in which: the steel sheet has a complex phase that includes: ferrite having an average crystal grain size of 15 μm or less to at least 90% in volume fraction; martensite having an average crystal grain size of 3.0 μm or less to 0.5% or more and less than 5.0% in volume fraction; pearlite to 5.0% or less in volume fraction; and the balance being a phase generated at low temperature.

Abstract translation: 高强度热浸镀锌钢板具有优异的可加工性，即延展性和孔膨胀成形性优异，成品率高。 该钢板具有以质量％计含有的化学成分：C：0.05〜0.15％ Si：0.10-0.90％; Mn：1.0-1.9％ P：0.005-0.10％; S：0.0050％以下; Al：0.01-0.10％; N：0.0050％以下; Nb：0.010-0.100％ 余量为Fe和偶然杂质，其中：钢板具有复相，其包含：平均晶粒尺寸为15μm以下的铁素体，体积分数为至少90％; 马氏体的平均结晶粒径为3.0μm以下，体积分率为0.5％以上且小于5.0％ 珠光体至体积分数的5.0％以下; 余量为在低温下产生的相。