公开(公告)号：US20240076754A1

公开(公告)日：2024-03-07

申请号：US18270617

申请日：2021-12-21

Applicant: JFE STEEL CORPORATION

Inventor： Futoshi OGASAWARA ,  Hidemitsu NEGISHI ,  Kenji NAKASE ,  Shota AMANO ,  Yumi MURAKAMI ,  Rei YOKOMORI ,  Yudai HATTORI ,  Ryo KAWABATA ,  Naoki KIKUCHI

IPC: C21C5/35 ,  C21C7/064 ,  C21C7/068

CPC classification number: C21C5/35 ,  C21C7/064 ,  C21C7/068

Abstract: A molten iron refining method having, an auxiliary material, and an oxidizing gas supplied through a top-blowing lance, to a cold iron source and molten pig iron that are contained/fed in a converter-type vessel, and molten iron is subjected to a refining process. A pre-charged cold iron source is charged into the converter-type vessel at an amount not larger than 0.15 times. A furnace-top-added cold iron source that's part or all of the cold iron source and added from a furnace top is fed during the refining process. A burner at a leading end of the top-blowing lance that spray holes through which a fuel and a combustion-supporting gas are ejected. During the refining process, a powdery auxiliary material processed into powder that's part of the auxiliary material is blown in, to pass through a flame formed by the burner.

公开(公告)号：US20240393159A1

公开(公告)日：2024-11-28

申请号：US18691887

申请日：2022-08-10

Applicant: JFE STEEL CORPORATION

Inventor： Hiroto KASE ,  Sota ITO ,  Keisuke SANO ,  Rei YOKOMORI ,  Futoshi OGASAWARA ,  Ryo KAWABATA ,  Tomohiko ITO

IPC: G01G17/04 ,  C21C5/32 ,  C21C5/46 ,  G01F23/284 ,  G01N9/32

Abstract: A furnace slag amount estimation device (1) includes: an input unit (11) configured to receive input data including furnace shape data for a converter, data on components and temperatures of molten metal and slag before start of or during blowing treatment, and slag height data in a furnace of the converter; a slag bulk density calculation unit (13) configured to calculate a slag bulk density after the converter is tilted, using the input data and a model; a slag volume calculation unit (14) configured to calculate a slag volume in the furnace after the converter is tilted, using the slag height data after the converter is tilted, the furnace shape data, and a model; and a slag weight calculation unit (15) configured to calculate a slag weight in the furnace after the converter is tilted and slag is discharged, using the calculated slag bulk density and the calculated slag volume.

公开(公告)号：US20240068061A1

公开(公告)日：2024-02-29

申请号：US18270606

申请日：2021-12-17

Applicant: JFE STEEL CORPORATION

Inventor： Rei YOKOMORI ,  Futoshi OGASAWARA ,  Ryo KAWABATA ,  Naoki KIKUCHI ,  Yudai HATTORI

IPC: C21C7/072 ,  C21C1/02 ,  C21C5/28 ,  C21C7/068

CPC classification number: C21C7/072 ,  C21C1/02 ,  C21C5/28 ,  C21C7/068 ,  C21C2300/08

Abstract: A converter steelmaking method has molten pig iron subjected to dephosphorization process for dephosphorized molten iron, dephosphorized molten iron is subjected to decarburization process for molten steel. For dephosphorization process, a first cold iron source in amount meeting Formula (1) is charged into first converter-type vessel, then undephosphorized molten pig iron is charged and subjected to dephosphorization process. Dephosphorized molten iron is discharged and held in molten metal receiving vessel. After second cold iron source is charged into first converter-type vessel in which dephosphorization process has been performed, the dephosphorized molten iron held in molten metal receiving vessel is charged and subjected to decarburization process. % Ws0≤0.1186T−134 (% Ws0≥0) . . . (1), where % Ws0: a ratio (%) of first cold iron source to sum of first cold iron source and charge amount of undephosphorized molten pig iron, and T: a temperature (° C.) of undephosphorized molten pig iron.

公开(公告)号：US20250075280A1

公开(公告)日：2025-03-06

申请号：US18293956

申请日：2022-06-14

Applicant: JFE STEEL CORPORATION

Inventor： Rei YOKOMORI ,  Ryo KAWABATA ,  Naoki KIKUCHI ,  Tomohiro SUGINO ,  Hiroto KASE

IPC: C21B13/00

Abstract: A cold iron source melting ratio estimation device that estimates a melting ratio of a cold iron source charged into a converter-type refining furnace during refining of molten iron in the converter-type refining furnace. The device includes: an input section to which measured values of in-furnace information or estimated values of the in-furnace information is input, the in-furnace information including a molten iron temperature and a carbon concentration in the molten iron during refining; a database section that stores a model equation and parameters related to a refining reaction of the molten iron in the converter-type refining furnace; a computation section that computes the melting ratio of the cold iron source using the measured values or the estimated values input to the input section; and an output section that displays the melting ratio of the cold iron source computed by the computation section.

公开(公告)号：US20240060149A1

公开(公告)日：2024-02-22

申请号：US18270600

申请日：2021-12-17

Applicant: JFE STEEL CORPORATION

Inventor： Futoshi OGASAWARA ,  Yudai HATTORI ,  Rei YOKOMORI ,  Ryo KAWABATA

IPC: C21C1/02 ,  C21C5/35

CPC classification number: C21C1/02 ,  C21C5/35

Abstract: A molten iron refining method that prevents a cold iron source from remaining unmelted even under the condition of a high ratio of the cold iron source. An auxiliary material is added, and an oxidizing gas is supplied, to cold iron source and molten pig iron that are contained or fed in converter-type vessel, and molten iron is subjected to refining process. Prior to refining process, a pre-charged cold iron source that is charged all at once into the converter-type vessel before the molten pig iron is charged into the converter-type vessel is charged in an amount not larger than 0.15 times the sum of an amount of the pre-charged cold iron source and a charge amount of the molten pig iron, or is not charged. A furnace-top-added cold iron source that is added from a furnace top of the converter-type vessel is fed into converter-type vessel during refining process.