公开(公告)号：US20250065436A1

公开(公告)日：2025-02-27

申请号：US18685502

申请日：2022-07-27

Applicant: JFE STEEL CORPORATION

Inventor： Muneo MATSUSHITA ,  Shohei IWATA ,  Yasushi KITANI

IPC: B23K20/12 ,  B23K103/04 ,  C21D7/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  H01F41/00

Abstract: An electrical steel strip friction stir welding method is provided that is able to inhibit the occurrence of coil joint fracture on a production line caused by deterioration of mechanical properties and shape of the coil joint. Diameter D (mm) of shoulders of rotating tools satisfies the relationship of the following Expression (1), and rotation speed RS (r/min) of the rotating tools, the diameter D (mm), and joining speed JS (mm/min), expressed as RS×D3/JS, satisfy the relationship of the following Expression (2). 4 × TJ ≤ D ≤ 10 × TJ ( 1 ) 200 × TJ ≤ RS × D 3 / JS ≤ 2 ⁢ 000 × TJ ( 2 )

公开(公告)号：US20250065432A1

公开(公告)日：2025-02-27

申请号：US18293892

申请日：2022-08-29

Applicant: JFE STEEL CORPORATION

Inventor： Akiyoshi ANDO ,  Atsushi TAKADA ,  Kazufumi WATANABE ,  Takatoshi OKABE ,  Keiji UEDA ,  Masamichi SUZUKI ,  Peng HAN

IPC: B23K9/18 ,  B23K35/30 ,  B23K103/04

Abstract: Provided is a submerged arc welding method that produces little fume, has good weldability, and is suitable for welding high-Mn-containing steel materials to be used in cryogenic environments. The method includes welding with a combination of a wire having a predetermined chemical composition and flux having a basicity [BL] of 1.5 to 2.4, while adjusting a welding heat input according to a groove cross-sectional area. In this way, a weld metal with high strength and excellent cryogenic impact toughness where the 0.2% proof stress at room temperature is 400 MPa or more and an absorbed energy (vE−196) in the Charpy impact test is 28 J or more can be easily manufactured.

公开(公告)号：US12234523B2

公开(公告)日：2025-02-25

申请号：US17801020

申请日：2020-12-23

Applicant: JFE Steel Corporation

Inventor： Karin Kokufu ,  Makoto Watanabe ,  Takashi Terashima ,  Toshito Takamiya

IPC: C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  H01F1/16 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A grain-oriented electrical steel sheet has a base film composed mainly of forsterite on a surface of the grain-oriented electrical steel sheet and an insulating film containing mainly silicate-phosphate glass which is formed on a surface of the base film, in which, by controlling concentrations of Sr, Ca, and Ba in the base film and the insulating film to have specified gradients, the adhesion property and film tension of the insulating film are improved.

公开(公告)号：US12227816B2

公开(公告)日：2025-02-18

申请号：US17787397

申请日：2020-11-24

Applicant: JFE Steel Corporation

Inventor： Mitsuhiro Okatsu ,  Masao Yuga ,  Toshiharu Hirama

IPC: C21D9/08 ,  C21D6/00 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  F16L9/02

Abstract: Provided herein is a high-strength seamless steel pipe, and a method for manufacturing same. A high-strength seamless steel pipe of the present invention has a yield strength of 758 MPa or more, and a KILIMIT value of 23.0 MPa√m or more as an evaluation index of sulfide stress corrosion cracking resistance.

公开(公告)号：US20250052672A1

公开(公告)日：2025-02-13

申请号：US18718434

申请日：2022-12-19

Applicant: JFE STEEL CORPORATION

Inventor： Seiya SUGAWARA

IPC: G01N21/3563 ,  G01N31/10 ,  G01N31/12 ,  G01N33/2022

Abstract: A method for quantifying carbon in carbides that allows highly precise and simple quantification of carbon in carbides. The method for quantifying carbon in the carbides includes a combustion process in which the carbides are heated together with a composite member in the presence of oxygen to oxidize the carbon in the carbides to carbon monoxide and/or carbon dioxide, and a quantification process of quantifying the carbon monoxide and/or the carbon dioxide. The composite member includes two or more metal members that have main components that are different from each other.

公开(公告)号：US20250051873A1

公开(公告)日：2025-02-13

申请号：US18720754

申请日：2022-12-05

Applicant: JFE Steel Corporation

Inventor： Yuta SAKURAI ,  Tomoya ODAGAKI ,  Kenji TSUZUMI ,  Akitoshi MATSUI ,  Tetsuo MOCHIDA ,  Naoki KIKUCHI

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/16

Abstract: A method for producing Cu—Sn-containing steel includes a hot heating step of attaching a flux to a surface of a Cu—Sn-containing cast steel in such an amount that the mass per unit area is 50 g/m2 or more and 5000 g/m2 or less, and heating the Cu—Sn-containing cast steel at a temperature of 1000° C. or above and 1400° C. or below, the flux including at least any of B2O3, P2O5, K2O, PbO, Na2O—FeO, Na2O—SiO2, Na2O—TiO2, and Li2O—SiO2 components and being such that the liquid phase ratio at 1000° C. is 10 mass % or more; and a hot working step of hot working the Cu—Sn-containing cast steel.

公开(公告)号：US20250034691A1

公开(公告)日：2025-01-30

申请号：US18716260

申请日：2022-10-11

Applicant: JFE STEEL CORPORATION

Inventor： Yu ITO ,  Hideyuki TAKAHASHI ,  Kenji YAMASHIRO ,  Takumi KOYAMA ,  Yoshihiko KAKU

IPC: C23C2/20 ,  C23C2/06 ,  C23C2/40

Abstract: A gas wiping nozzle and a method for manufacturing a hot-dip metal-coated steel strip using the gas wiping nozzle. The gas wiping nozzle adjusts the coating weight of a molten metal on the surface of a steel strip pulled up from a molten metal bath. At least the surface of the gas wiping nozzle is made of a ceramic, and the arithmetic mean roughness Ra and the peak count PPI of the gas wiping nozzle satisfy Formula (1): PPI > c ⁢ 1 × Ra + c ⁢ 2 ( 1 ) PPI: peak count (the number of peaks per inch) Ra: arithmetic mean roughness [μm] c1 and c2: determined constants for each ceramic used in the surface of the gas wiping nozzle.

公开(公告)号：US20250034673A1

公开(公告)日：2025-01-30

申请号：US18715826

申请日：2022-07-28

Applicant: JFE Steel Corporation

Inventor： Hirokazu KOBAYASHI ,  Gentaro TAKEDA ,  Munesuke SUZUKI ,  Kazuki OKAMOTO ,  Hidenori SHIMADA

IPC: C21D9/573 ,  C21D1/18

Abstract: An apparatus for manufacturing a steel strip, includes: a first water tank part that stores cooling water for immersing and cooling a steel strip; a water cooling nozzle unit that is provided in the first water tank part and injects cooling water to a surface of the steel strip; a second water tank part connected to the first water tank part through a joining port; an opening and closing door that opens and closes the joining port; and a conveyance control part that conveys the water cooling nozzle unit such that the water cooling nozzle unit passes through the joining port and is positioned at either a cooling water injection position inside the first water tank part or a non-water cooling standby position inside the second water tank part.

公开(公告)号：US12203835B2

公开(公告)日：2025-01-21

申请号：US17601617

申请日：2020-04-03

Applicant: JFE STEEL CORPORATION

Inventor： Toshiki Tsuboi ,  Naoshi Yamahira

IPC: G01N15/0205 ,  C21B5/00 ,  C21B7/24 ,  F27B1/28 ,  G01N15/02 ,  G01N15/075 ,  G01N33/00 ,  G01N33/24 ,  F27D19/00 ,  F27D21/02 ,  G01N15/00 ,  G01N21/17

Abstract: A fine ratio measuring method and apparatus. The fine ratio measuring method includes a step S1 of measuring a distance between a distance measuring device and lumps of material, a step S2 of calculating a feature quantity from distance data obtained in the step S1, and a step S3 of converting the feature quantity calculated in step S2 to a fine ratio. The feature quantity calculated in step S2 represents distance variation calculated from the distance data obtained in the step S1. A higher fine ratio in lumps of material means greater microscopic distance variation caused by microscopic irregularities in the surface of the lumps of material in the height direction within a three-dimensional shape. Therefore, by using the distance variation as the feature quantity, the fine ratio in the lumps of material can be measured in real time with high accuracy.

公开(公告)号：US20250022115A1

公开(公告)日：2025-01-16

申请号：US18712546

申请日：2022-11-18

Applicant: JFE STEEL CORPORATION

Inventor： Arihiro MATSUNAGA ,  Shunsuke MORI ,  Kazuhiro TSUCHIDA

IPC: G06T7/00 ,  B22F9/06 ,  G01N15/0205 ,  G06T7/62

Abstract: An apparatus and a method for measuring granular objects, an abnormality detection method, and a method for producing granular iron are provided. An apparatus for measuring granular objects thrown into a liquid surface, the apparatus including an imaging device configured to continuously image the liquid surface, and a processing unit configured to measure the granular objects from time-series image data of the liquid surface imaged by the imaging device, in which the processing unit is configured to perform dynamic mode decomposition from the imaging device and the time-series image data, select, as a measurement dynamic mode, a dynamic mode in which an emphasized point is a vibrating liquid surface among dynamic modes obtained by the dynamic mode decomposition, obtain a measurement vibration frequency as a vibration frequency of a dynamic mode eigenvalue in the measurement dynamic mode, and measure the granular objects based on the measurement vibration frequency.