公开(公告)号：US11965223B2

公开(公告)日：2024-04-23

申请号：US17262878

申请日：2019-07-18

Applicant: JFE Steel Corporation

Inventor： Noriaki Kohsaka ,  Soshi Yoshimoto ,  Tomohiro Hashimukai ,  Takuya Hirashima

IPC: C21D9/46 ,  C21D1/60 ,  C21D1/63 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/42 ,  C22C38/60

CPC classification number: C21D9/46 ,  C21D1/60 ,  C21D1/63 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/42 ,  C22C38/60 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A thin steel sheet has a steel structure which has a ferrite area fraction of 30% or less, a bainite area fraction of 5% or less, a martensite and tempered martensite area fraction of 70% or more, and a retained austenite area fraction of 2.0% or less and in which the ratio of the dislocation density in the range of 0 μm to 20 μm from a surface of the steel sheet to the dislocation density of a through-thickness central portion of the steel sheet is 90% to 110% and the average of the top 10% of the sizes of cementite grains located in a depth of up to 100 μm from a surface of the steel sheet is 300 nm or less. The maximum camber of the steel sheet sheared to a length of 1 m in a longitudinal direction of the steel sheet is 15 mm or less.

公开(公告)号：US11965222B2

公开(公告)日：2024-04-23

申请号：US17158097

申请日：2021-01-26

Applicant: JFE Steel Corporation

Inventor： Hidekazu Minami ,  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 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C23C2/00 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C30/00 ,  C25D5/50 ,  C25D7/06

CPC classification number: C21D9/46 ,  B32B15/01 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C23C2/00 ,  C23C2/04 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C30/00 ,  C23C30/005 ,  C25D5/50 ,  C25D7/0614 ,  Y10T428/12757 ,  Y10T428/12799 ,  Y10T428/12951 ,  Y10T428/12972

Abstract: A method of producing a hot-rolled steel sheet and a method for producing a cold-rolled full hard steel sheet are provided. The methods comprising heating a steel slab having a composition containing, in terms of mass %, C: 0.010% or more and 0.150% or less, Si: 0.20% or less, Mn: 1.00% or less, P: 0.100% or less, S: 0.0500% or less, Al: 0.001% or more and 0.100% or less, N: 0.0100% or less, and the balance being Fe and unavoidable impurities, in which 0.002%≤[% P]+[% S]≤0.070% ([% M] denotes a content (mass %) of M element in steel) is satisfied.

公开(公告)号：US20240123700A1

公开(公告)日：2024-04-18

申请号：US18276370

申请日：2022-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Hiroto MIYAKE

IPC: B30B15/28 ,  B30B9/28 ,  B30B15/02

CPC classification number: B30B15/28 ,  B30B9/28 ,  B30B15/02

Abstract: A damage evaluation device for a press-forming die includes: evaluation dies installed in a pressing device configured to press-form a metal material; and an observation device configured to observe damage behavior of a die steel material and surface coating constituting the evaluation dies. The evaluation dies include: a perforating unit configured to form a hole in the metal material; a first shearing unit configured to shear the metal material in which the hole is formed into a predetermined metal component shape; and a second shearing unit configured to separate a metal component from the metal material, and dies of the perforating unit, the first shearing unit and the second shearing unit are formed of the die steel material and have a structure that enables replacement with another die made of predetermined material and applied with predetermined surface coating treatment.

公开(公告)号：US20240123542A1

公开(公告)日：2024-04-18

申请号：US18276488

申请日：2021-10-26

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Yukihiro Matsubara ,  Takayuki Fukunaga

IPC: B23K26/0622 ,  B21B15/00 ,  B23K26/14 ,  B23K26/38 ,  B23K26/40

CPC classification number: B23K26/0622 ,  B21B15/00 ,  B23K26/14 ,  B23K26/38 ,  B23K26/40 ,  B23K2103/04

Abstract: A laser cutting method for a steel strip, includes cutting a vicinity of a joint obtained by joining a rear end of a preceding steel strip and a front end of a following steel strip by using a pulse-type laser beam, wherein output of the pulse-type laser beam is set to 0.5 kw or more per 1 ms, a processing point diameter of the pulse-type laser beam is set to 0.1 mm or more and less than 0.6 mm, and a ratio between a pulse period time and a down-time is set to 0.3 or more and less than 0.8.

公开(公告)号：US11959157B2

公开(公告)日：2024-04-16

申请号：US17264295

申请日：2019-07-31

Applicant: JFE STEEL CORPORATION

Inventor： Daichi Izumi ,  Shigeki Kitsuya ,  Keiji Ueda ,  Koichi Nakashima

IPC: C22C38/28 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/38

CPC classification number: C22C38/38 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C21D2211/001

Abstract: Provided is a high-Mn steel having excellent low-temperature toughness and excellent surface characteristics. A high-Mn steel comprises: a chemical composition containing, in mass %, C: 0.100 to 0.700%, Si: 0.05 to 1.00%, Mn: 20.0 to 35.0%, P: ≤0.030%, S: ≤0.0070%, Al: 0.010 to 0.070%, Cr: 0.50 to 5.00%, N: 0.0050 to 0.0500%, O: ≤0.0050%, Ti: ≤0.005%, and Nb: ≤0.005%, with a balance consisting of Fe and inevitable impurities; and a microstructure having austenite as a matrix, wherein in the microstructure, a Mn concentration of a Mn-concentrated portion is 38.0% or less, and an average KAM value is 0.3 or more, yield stress is 400 MPa or more, absorbed energy vE−196 in a Charpy impact test at −196° C. is 100 J or more, and percent brittle fracture is less than 10%.

公开(公告)号：US11959147B2

公开(公告)日：2024-04-16

申请号：US17601481

申请日：2020-04-02

Applicant: JFE STEEL CORPORATION

Inventor： Yumi Murakami ,  Nobuhiko Oda ,  Yusuke Fujii ,  Goro Okuyama ,  Shota Amano ,  Shinji Koseki ,  Shingo Sato ,  Yukio Takahashi ,  Ryo Kawabata ,  Naoki Kikuchi ,  Atsuo Yuasa

IPC: C21C5/46

CPC classification number: C21C5/4606

Abstract: A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.

公开(公告)号：US20240117517A1

公开(公告)日：2024-04-11

申请号：US18250978

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Takashi KAWANO ,  Takako YAMASHITA ,  Hiroshi MATSUDA ,  Yoichi MAKIMIZU

IPC: C25D3/20 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25D7/06

CPC classification number: C25D3/20 ,  C21D8/0236 ,  C21D8/0257 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25D7/0614

Abstract: Disclosed is an Fe-based electroplated steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and 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 of 5.0 g/m2 or more, in which in an intensity profile measured by glow discharge optical emission spectrometry, a peak of emission intensity at wavelengths indicating Si is detected within a range from a surface of the Fe-based electroplating layer to more than 0.2 μm in a thickness direction and not more than a thickness of the Fe-based electroplating layer, and an average value of C concentration in a region ranging from 10 μm to 20 μm in the thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.

公开(公告)号：US11946828B2

公开(公告)日：2024-04-02

申请号：US17615618

申请日：2020-02-14

Applicant: JFE STEEL CORPORATION

Inventor： Hideaki Kobiki ,  Kentaro Sato ,  Tsuyoshi Shiozaki

IPC: G01M17/00 ,  B62D25/04 ,  G01M17/007

CPC classification number: G01M17/0078 ,  B62D25/04

Abstract: A side crash test apparatus uses a crash test structure including a center pillar, a roof-rail simulated part, and a rocker simulated part, and includes: a striker; a roof rail support; and a rocker support. The rocker support includes a rocker-rotation braking mechanism configured to restrain translation of the rocker simulated part, and support the rocker simulated part to be rotatable about an axis thereof and allow braking of the rotation. The rocker-rotation braking mechanism includes a rocker-rotation support member configured to rotate about the axis together with the rocker simulated part, a rocker-rotation shaft support configured to support a rotation center of the rocker-rotation support member, a rocker-rotation braking plate extended by rotation of the rocker-rotation support member while braking the rotation when the striker crashes into the center pillar, and a rocker rotation braking plate fixed portion configured to fix another end side of the rocker-rotation braking plate.

公开(公告)号：US11946111B2

公开(公告)日：2024-04-02

申请号：US16086044

申请日：2017-03-07

Applicant: JFE Steel Corporation

Inventor： Hidekazu Minami ,  Yoshimasa Funakawa ,  Shinjiro Kaneko

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C23C2/02 ,  C23C2/28

CPC classification number: C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/024 ,  C23C2/28 ,  C21D2211/005 ,  C21D2211/008

Abstract: A steel sheet is provided, having a tensile strength of 590 MPa or more, a particular composition and a steel structure that contains, in terms of area fraction, particular amounts of ferrite and martensite, in which the ferrite average crystal grain size is 20 μm or less, the martensite average size is 15 μm or less, the ratio of the average crystal grain size of the ferrite to the average size of the martensite (ferrite average crystal grain size/martensite average size) is 0.5 to 10.0, the ratio of the hardness of the martensite to the hardness of the ferrite (martensite hardness/ferrite hardness) is 1.0 or more and 5.0 or less, and, in the texture of the ferrite, the inverse intensity ratio of γ-fiber to the α-fiber is 0.8 or more and 7.0 or less.

公开(公告)号：US11940215B2

公开(公告)日：2024-03-26

申请号：US17040537

申请日：2019-03-25

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Kashihara ,  Yuki Okamoto ,  Natsuo Ishiwata

IPC: F27B1/28 ,  B65G11/20 ,  C21B7/18 ,  F27B1/20 ,  F27D3/00 ,  F27D3/10 ,  G01S13/89

CPC classification number: F27B1/28 ,  B65G11/206 ,  C21B7/18 ,  F27B1/20 ,  F27D3/0024 ,  F27D3/0031 ,  F27D3/10 ,  G01S13/89 ,  B65G2201/045 ,  B65G2203/02 ,  B65G2203/042 ,  F27D2003/0075 ,  F27D2003/0089

Abstract: Disclosed is a blast furnace apparatus includes: a rotating chute; a profile measurement device configured to measure surface profiles of a burden charged into the furnace; and a tilt angle controller configured to control a tilt angle of the chute, in which the device includes a radio wave distance meter installed on the furnace top and configured to measure the distance to the surface of the burden, derives the profiles on a basis of distance data for the entire furnace obtained by scanning a detection wave of the distance meter in the furnace in a circumferential direction, and includes at least one of arithmetic units configured to command during rotation, on a basis of the surface profiles obtained, the controller to change the tilt angle of the chute, or a controller to change a rotational speed of the chute or a feed speed of the burden fed to the chute.