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：US20220152695A1

公开(公告)日：2022-05-19

申请号：US17440150

申请日：2020-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA

IPC: B22D11/18

Abstract: A device includes: an input device configured to receive an input of measurement results of a temperature and components of molten steel in a tundish of continuous casting facilities, measurement results of a width, a thickness, and a casting speed of a cast slab casted in the continuous casting facilities, and molten steel flow rate distribution in a mold; a model database configured to store a model expression and a parameter related to solidification reaction of molten steel in the mold; a convertor configured to convert a molten steel flow rate in the mold into a heat conductivity parameter; and a calculator configured to estimate a solidified shell thickness in the mold based on temperature distribution of the mold and steel in the mold calculated by solving a three-dimensional transient heat conduction equation using the measurement results.

公开(公告)号：US20220152694A1

公开(公告)日：2022-05-19

申请号：US17600899

申请日：2020-03-27

Applicant: JFE STEEL CORPORATION

Inventor： Shuhei IRIE ,  Satoshi UEOKA ,  Hirokazu SUGIHARA ,  Hiroyuki FUKUDA ,  Norichika ARAMAKI ,  Akitoshi MATSUI ,  Kenichi OSUKA ,  Sho KOKUFU

IPC: B22D11/124 ,  B22D11/14

Abstract: A method for continuously casting steel capable of reducing center segregation that occurs in a slab. In a section in a continuous casting machine in a slab withdrawal direction, a section from a start point at which the average value of solid phase ratios along a thickness direction at a widthwise center of a slab is within a range of 0.4 or more and 0.8 or less to an end point at which the average value of solid phase ratios along the thickness direction at the widthwise center of the slab is greater than the average value of solid phase ratios at the start point and is 1.0 or less is set as a first section. The slab is cooled by water in the first section at a water flow rate per surface area of the slab within a range of 50 L/(m2×min) or more and 2,000 L/(m2×min) or less.

公开(公告)号：US20220126359A1

公开(公告)日：2022-04-28

申请号：US17436199

申请日：2020-02-28

Applicant: JFE STEEL CORPORATION

Inventor： Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Yoshinari HASHIMOTO ,  Ryosuke MASUDA ,  Taiga KORIYAMA ,  Ryo MORISHITA

IPC: B22D11/20 ,  B22D11/115

Abstract: A continuously casting method including arranging temperature measuring elements according to specified conditions, selecting as evaluation targets for temperatures of copper plates on a wide face of mold values measured by the temperature measuring elements arranged closer to a center in a width direction of a cast slab than short sides of the cast slab under continuous casting at levels of 50 mm or more lower in a slab withdrawal direction than a meniscus of a molten steel in a mold, and adjusting a casting condition such that a standard deviation of the values measured over the width direction of the copper plates on the wide face of mold at a same level in the slab withdrawal direction is 20° C. or lower.

公开(公告)号：US20250144702A1

公开(公告)日：2025-05-08

申请号：US18730104

申请日：2023-03-23

Applicant: JFE STEEL CORPORATION

Inventor： Norichika ARAMAKI ,  Shuhei IRIE ,  Akitoshi MATSUI ,  Hirokazu SUGIHARA ,  Yusuke NOJIMA

IPC: B22D11/124 ,  B22D11/22

Abstract: A steel continuous casting method effectively reducing center segregation occurring inside a cast piece includes cooling of a cast piece performed with a water volume density per surface area of the cast piece in a first section set within a range of 50 to 2000 L/(m2×min) or lower. The first section is a range along a cast piece withdrawing direction in a continuous casting machine, from a start point at which an average value of a solid phase ratio along a thickness direction at a final solidified part in a cast piece width direction is 0.8 or lower to an end point at which the average value of the solid phase ratio along the thickness direction at the final solidified part in the cast piece width direction is higher than the solid phase ratio at the start point but not higher than 1.0.

公开(公告)号：US20230226600A1

公开(公告)日：2023-07-20

申请号：US18009909

申请日：2021-04-09

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Takehide HIRATA

IPC: B22D11/18 ,  B22D11/04 ,  B22D2/00

CPC classification number: B22D11/182 ,  B22D11/04 ,  B22D2/00

Abstract: A breakout prediction method includes: a step of inputting a dimension of a solid product withdrawn from a mold in a continuous casting machine; a step of detecting a temperature of the mold by a plurality of thermometers embedded in the mold; a step of executing interpolation processing on the detected temperatures detected by the plurality of thermometers according to the dimension of the solid product; a step of calculating, based on the temperatures calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained by principal component analysis as a degree of deviation from during a normal operation in which a breakout has not occurred; and a step of predicting a breakout based on the degree of deviation.

公开(公告)号：US20210387250A1

公开(公告)日：2021-12-16

申请号：US17422674

申请日：2020-02-06

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Ryo MORISHITA

IPC: B22D11/18 ,  B22D11/115 ,  G05B15/02

Abstract: A control method for a continuous casting machine, includes: estimating, by on-line real-time system, a flow state of molten steel in a mold by using an operation condition of a continuous casting machine and temperature data on the molten steel in the mold; calculating, by on-line real-time system, a molten steel flow index based on the estimated flow state of the molten steel, the molten steel flow index being a factor of mixing of an impurity into a casting inside the mold; and controlling the operation condition of the continuous casting machine such that the calculated molten steel flow index is within an appropriate range.

公开(公告)号：US20240042515A1

公开(公告)日：2024-02-08

申请号：US18269057

申请日：2021-11-29

Applicant: JFE STEEL CORPORATION

Inventor： Naoya SHIBUTA ,  Satoshi OYAMA ,  Yoshiyuki TANAKA ,  Akitoshi MATSUI

IPC: B22D11/115 ,  B22D11/00 ,  B22D11/041

CPC classification number: B22D11/115 ,  B22D11/001 ,  B22D11/041

Abstract: A continuous casting method of steel of continuously casting a slab by using a vertical liquid bending type continuous casting machine. The method includes, while performing continuous casting by using an in-mold electromagnetic stirring device, applying an alternating-current moving magnetic field that moves in a width direction of a mold to molten steel inside the mold, inducing a swirling flow in the molten steel, and stirring the molten steel. A travel speed of the alternating-current moving magnetic field calculated by a specified formula is in a range of 0.20 to 1.50 m/s.

公开(公告)号：US20220333921A1

公开(公告)日：2022-10-20

申请号：US17761642

申请日：2020-09-04

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Miho SATO

IPC: G01B21/08 ,  B22D11/22

Abstract: An in-mold solidified shell thickness estimation apparatus includes: an input device; a model database configured to store a model formula and a parameter related to a solidification reaction of a molten steel inside a mold of a continuous casting facility; and a heat transfer model calculator configured to estimate an in-mold solidified shell thickness by calculating temperature distributions of the mold and of the molten steel inside the mold by solving a three-dimensional unsteady heat transfer equation. The heat transfer model calculator is configured to correct errors in a temperature of a mold copper plate and in an amount of heat removed from the mold, by correcting an overall heat transfer coefficient between the mold copper plate and the solidified shell.