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：US20250108433A1

公开(公告)日：2025-04-03

申请号：US18832809

申请日：2023-01-25

Applicant: JFE Steel Corporation

Inventor： Ryosuke MASUDA ,  Naoya SHIBUTA ,  Taiga KORIYAMA

IPC: B22D11/16 ,  B22D11/08

Abstract: A continuous casting start timing determination method, a continuous casting facility operation method, a slab manufacturing method, a determining device, a continuous casting start determination system, and a display terminal device are provided. A continuous casting start timing determination method for determining a continuous casting start timing includes: a measurement step of measuring temperatures in a copper plate of a casting mold in the continuous casting facility, by use of a plurality of temperature sensors provided in a casting-direction determination position as a predetermined casting-direction position on the copper plate; and a determination step of determining the start timing based on a casting-direction position of a molten metal surface of molten steel, the casting-direction position being estimated based on measurement results in the measurement step and a width of a slab to be cast in the continuous casting facility.

公开(公告)号：US20190048431A1

公开(公告)日：2019-02-14

申请号：US16079712

申请日：2017-02-15

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke FUJII ,  Yoshie NAKAI ,  Naoki KIKUCHI ,  Naoya SHIBUTA ,  Shinichi NAGAI ,  Takahiko MAEDA ,  Yuji MIKI

IPC: C21C7/10 ,  C21C7/064 ,  C21C7/072

Abstract: A molten steel refining method includes throwing a powder to molten steel while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P=ρg× U2/2 . . . (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρg the density (kg/Nm3) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.