公开(公告)号：US12203155B2

公开(公告)日：2025-01-21

申请号：US17294531

申请日：2019-11-05

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

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

Abstract: A steel sheet for cans has a chemical composition containing, in mass percent, C: 0.085% to 0.130%, Si: 0.04% or less, Mn: 0.10% to 0.60%, P: 0.02% or less, S: more than 0.010% to 0.020%, Al: 0.02% to 0.10%, N: 0.0005% to 0.0040%, Nb: 0.007% to 0.030%, and B: 0.0010% to 0.0050%, B/N that is the ratio of the content (mass percent) of B to the content (mass percent) of N being 0.80 or more, the remainder being Fe and inevitable impurities, and a ferrite microstructure containing 1.0% or more pearlite in terms of area fraction. The steel sheet for cans has a yield stress of 500 MPa or more, a tensile strength of 550 MPa or more, a uniform elongation of 10% or more, and a yield elongation of 5.0% or less.

公开(公告)号：US10760142B2

公开(公告)日：2020-09-01

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

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：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：US11486018B2

公开(公告)日：2022-11-01

申请号：US16495991

申请日：2018-03-12

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Junichi Kitagawa ,  Katsumi Kojima

IPC: B32B15/09 ,  C21D9/46 ,  B32B15/18 ,  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 0.030%; 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, a yield point is 280 MPa or more and less than 420 MPa, yield elongation is 3% or less, and Δr is −0.30 to 0.20.

公开(公告)号：US10655199B2

公开(公告)日：2020-05-19

申请号：US15551641

申请日：2016-01-27

Applicant: JFE STEEL CORPORATION

Inventor： Takumi Tanaka ,  Tomonari Hiraguchi ,  Katsumi Kojima ,  Hiroki Nakamaru ,  Nobusuke Kariya

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

Abstract: Provided are a steel sheet, having sufficient strength and formability regardless of reduction of thickness, for crown caps; a method for manufacturing the same; and a crown cap. The steel sheet for crown caps has a composition containing C: 0.0010% to less than 0.0050%, Si: 0.10% or less, Mn: 0.05% to less than 0.50%, P: 0.050% or less, S: 0.050% or less, Al: more than 0.002% to less than 0.070%, N: less than 0.0040%, and B: 0.0005% to 0.0020% on a mass basis, the balance being Fe and inevitable impurities, and also has a yield strength of 500 MPa or more in a rolling direction, an average Lankford value (r) of 1.1 or more, and an in-plane anisotropy (Δr) of Lankford value of −0.3 to 0.3.

公开(公告)号：US20180057919A1

公开(公告)日：2018-03-01

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

CPC classification number: C22C38/60 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  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：US20170335438A1

公开(公告)日：2017-11-23

申请号：US15527167

申请日：2015-11-19

Applicant: JFE Steel Corporation

Inventor： Takumi Tanaka ,  Tomonari Hiraguchi ,  Katsumi Kojima ,  Hiroki Nakamaru ,  Nobusuke Kariya

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

CPC classification number: C22C38/06 ,  B65D41/12 ,  C21D6/005 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/0068 ,  C21D9/46 ,  C21D9/48 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04

Abstract: A steel sheet for a crown cap has sufficient strength and formability even when the thickness thereof is reduced for use, and has a composition containing, in percent by mass, C: 0.010% to 0.025%, Si: 0.10% or less, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.005% to 0.050%, Al: 0.020% to 0.070%, N: less than 0.0040%, and the balance being Fe and inevitable impurities, wherein yield strength after heat treatment at 210° C. for 15 minutes is as follows: the yield strength is 550 MPa or more in a rolling direction, and the yield strength in a direction 45° from the rolling direction in a rolling plane is equal to or less than the average of the yield strength in the rolling direction and the yield strength in a direction 90° from the rolling direction in the rolling plane.

公开(公告)号：US11459149B2

公开(公告)日：2022-10-04

申请号：US16631539

申请日：2018-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Takashi Ueno ,  Nobusuke Kariya ,  Katsumi Kojima ,  Yoshihide Yamamoto ,  Akihiro Katagiri

IPC: B65D41/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D8/02 ,  C23G1/00

Abstract: A steel sheet for crown cap having excellent formability from which a crown cap having an excellent pressure resistance can be produced without an expensive soft liner even if the steel sheet is subjected to sheet metal thinning, the steel sheet having: a chemical composition containing, in mass %, C: more than 0.006% and 0.012% or less, Si: 0.02% or less, Mn: 0.10% or more and 0.60% or less, P: 0.020% or less, S: 0.020% or less, Al: 0.01% or more and 0.07% or less, and N: 0.0080% or more and 0.0200% or less, with the balance being Fe and inevitable impurities; and a percentage of a region of more than 0% and less than 20% at a position of ½ of a sheet thickness, the region having a dislocation density of 1×1014 m−2 or less.

公开(公告)号：US20220018003A1

公开(公告)日：2022-01-20

申请号：US17294531

申请日：2019-11-05

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

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

Abstract: A steel sheet for cans has a chemical composition containing, in mass percent, C: 0.085% to 0.130%, Si: 0.04% or less, Mn: 0.10% to 0.60%, P: 0.02% or less, S: more than 0.010% to 0.020%, Al: 0.02% to 0.10%, N: 0.0005% to 0.0040%, Nb: 0.007% to 0.030%, and B: 0.0010% to 0.0050%, B/N that is the ratio of the content (mass percent) of B to the content (mass percent) of N being 0.80 or more, the remainder being Fe and inevitable impurities, and a ferrite microstructure containing 1.0% or more pearlite in terms of area fraction. The steel sheet for cans has a yield stress of 500 MPa or more, a tensile strength of 550 MPa or more, a uniform elongation of 10% or more, and a yield elongation of 5.0% or less.

公开(公告)号：US20200024681A1

公开(公告)日：2020-01-23

申请号：US16496048

申请日：2018-03-12

Applicant: JFE Steel Corporation

Inventor： Hayato Saito ,  Nobusuke Kariya ,  Katsumi Kojima

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

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.