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US20250196223A1 - Immersion nozzle for continuous casting and continuous casting method for steel - Google Patents

Immersion nozzle for continuous casting and continuous casting method for steel Download PDF

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Publication number
US20250196223A1
US20250196223A1 US18/849,311 US202318849311A US2025196223A1 US 20250196223 A1 US20250196223 A1 US 20250196223A1 US 202318849311 A US202318849311 A US 202318849311A US 2025196223 A1 US2025196223 A1 US 2025196223A1
Authority
US
United States
Prior art keywords
mold
immersion nozzle
molten steel
continuous casting
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/849,311
Other languages
English (en)
Inventor
Norichika Aramaki
Shugo MORITA
Akitoshi Matsui
Ryosuke Chiyohara
Tetsuro KOYANO
Keisuke Sano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Assigned to JFE STEEL CORPORATION reassignment JFE STEEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAMAKI, Norichika, CHIYOHARA, Ryosuke, KOYANO, TETSURO, MATSUI, AKITOSHI, MORITA, Shugo, SANO, KEISUKE
Publication of US20250196223A1 publication Critical patent/US20250196223A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • An inert gas such as an argon gas, that has been blown into the molten steel flowing down inside the immersion nozzle to prevent adhesion of alumina to an inner wall of the immersion nozzle turns into bubbles and is discharged through the discharge ports of the immersion nozzle into the molten steel inside the mold.
  • one problem in reducing the amount of bubbles of the inert gas captured in the cast piece is how to decelerate the descending divergent flow after the collision with the cast piece short-side solidified shell.
  • Patent Literature 1 discloses an immersion nozzle for continuous casting which has, at a portion of the immersion nozzle to be immersed in molten steel, a plurality of upper and lower discharge ports formed such that the opening part area of the discharge port provided on the lower side becomes smaller than the opening part area of the discharge port provided on the upper side, and in which the inside diameter of a molten steel flow passage inside the immersion nozzle is smaller in a range where the discharge ports are provided than in an upper part where discharge ports are not provided.
  • Patent Literature 1 alleges that discharge flows from the discharge ports can be made into slow uniform flows, and that thereby the descending short-side flow can be weakened to reduce the amounts of bubbles of an inert gas and non-metallic inclusions entrapped in a cast piece.
  • Patent Literature 2 discloses an immersion nozzle for continuous casting that has, at a portion of the immersion nozzle to be immersed in molten steel, four discharge ports consisting of a left-row, upper-tier port, a left-row, lower-tier port, a right-row, upper-tier port, and a right-row, lower-tier port.
  • the opening part area of each lower-tier discharge port is smaller than the opening part area of each upper-tier discharge port.
  • a ratio of the opening part area of each lower-tier discharge port to a total of the opening part areas of the upper-tier and lower-tier discharge ports is between 0.2 and 0.4 inclusive.
  • the discharge angles of the lower-tier discharge ports are 10° or more downward based on the discharge angles of the upper-tier discharge ports.
  • Patent Literature 3 discloses an immersion nozzle having, at a portion to be immersed into molten steel inside a mold, two or more pairs of discharge ports that are bilaterally symmetrical with respect to an axial center of the immersion nozzle.
  • the opening part area of the discharge port located on the lower side is equal to or larger than the opening part area of the discharge port located on the upper side.
  • the discharge angle of each discharge port is limited to a maximum of 15° upward relative to the horizontal direction and a maximum of 50° downward relative to the horizontal direction.
  • the discharge port located on the lower side has a discharge angle that is a downward angle larger than the discharge angle of the discharge port located on the upper side, and the difference between the discharge angle of the discharge port located on the lower side and the discharge angle of the discharge port located on the upper side is between 20° and 55° inclusive.
  • the discharge angle of each discharge port is preferably within a range of 10° upward to 45° downward.
  • the discharge angle of the discharge port provided on the lower side and the discharge angle of the discharge port provided on the upper side are the same. Thus, no difference is provided between the discharge angle of the discharge port provided on the lower side and the discharge angle of the discharge port provided on the upper side. Therefore, discharge flows discharged through the upper and lower discharge ports merge, so that an ideal damping effect on the discharge flows can hardly be achieved.
  • the opening part area of the lower discharge port is smaller than the opening part area of the upper discharge port, and the difference between the discharge angle of the lower discharge port and the discharge angle of the upper discharge port is small. For these reasons, the flow velocity of the molten steel in the meniscus becomes high, leading to a high chance of the occurrence of the entrapment of the mold powder.
  • Patent Literature 3 mentions angles of the discharge ports, there is no specific description of the relationship between the straight-body-part internal cross-sectional area of the immersion nozzle and the areas of the discharge ports. Thus, specific conditions are unknown, and it is doubtful that an improving effect can be actually achieved.
  • the present invention has been developed in view of these circumstances, and an object thereof is to provide an immersion nozzle for continuous casting that improves the quality of a cast piece when pouring molten steel into a mold for continuous casting in continuous casting of steel.
  • the object is to stably inhibit the capture, in the cast piece, of bubbles of an inert gas, such as an argon gas, having been blown into the molten steel flowing down inside the immersion nozzle, as well as to stably inhibit the capture, in the cast piece, of a mold powder having been added to the meniscus.
  • Another object is to provide a steel continuous casting method that uses the immersion nozzle.
  • An immersion nozzle for continuous casting according to the present invention for solving the above-described problems is an immersion nozzle for continuous casting which has a shape of a cylinder with a bottom and through which molten steel is poured into a mold for continuous casting.
  • This immersion nozzle has the following characteristics.
  • the immersion nozzle has, at a portion to be immersed in the molten steel inside the mold for continuous casting, two or more pairs of discharge ports that are axially symmetrical with respect to an axial center of the immersion nozzle.
  • an inside diameter in a range from an upper end of an upper discharge port to a bottom of the immersion nozzle is equal to or smaller than that at other portions.
  • a ratio of a straight-body-part internal cross-sectional area (S 1 ) in a range from an upper end of the immersion nozzle to the upper end of the upper discharge port to a total one-side opening part area (S 3 +S 4 ) of the discharge ports is within a range of 0.30 to 0.50;
  • a ratio of a straight-body-part internal cross-sectional area (S 2 ) in a range from the upper end of the upper discharge port to the bottom of the immersion nozzle to the total one-side opening part area (S 3 +S 4 ) of the discharge ports is within a range of 0.10 to 0.40;
  • the straight-body-part internal cross-sectional areas (S 1 , S 2 ) of the immersion nozzle and the one-side opening areas (S 3 , S 4 ) of the discharge ports meet a relationship 0.20 ⁇ (S 2 /S 4 ) ⁇ (
  • a discharge angle of each of the discharge ports is within a range of +20° to ⁇ 50°, with an upward direction based on a horizontal plane being positive.
  • the discharge angle of the discharge port on a vertically lower side is vertically downward within a range of 20° to 55° based on the discharge angle of the discharge port on a vertically upper side.
  • the immersion nozzle for continuous casting according to the present invention could be a more preferable solution when two of the discharge ports with a vertical positional relationship face different directions in the horizontal plane, and at least one pair of the discharge ports faces a direction parallel to a long-side surface of the mold.
  • a steel continuous casting method is characterized in that: the above-described immersion nozzle is used; a mold powder is added to a surface of molten steel inside a mold for continuous casting; and molten steel inside a tundish is poured into the mold through the immersion nozzle, while an inert gas is blown into molten steel flowing down the molten steel flow passage of the immersion nozzle.
  • the steel continuous casting method according to the present invention could be a more preferable solution when, for example:
  • molten steel discharged through the upper and lower discharge ports of the immersion nozzle is kept at an appropriate discharge flow rate, and moreover, the discharge flows discharged through the upper and lower discharge ports collide with the cast piece short-side solidified shell without merging.
  • a descending divergent flow, after the collision with the cast piece short-side solidified shell, of the discharge flow from the discharge port located on the upper side and an ascending divergent flow, after the collision with the cast piece short-side solidified shell, of the discharge flow from the discharge port located on the lower side collide with each other, thereby each dampening the other's flow velocity.
  • the descending short-side flow that influences the capture of bubbles of an inert gas in the cast piece is mainly formed by the descending divergent flow, after the collision with the cast piece short-side solidified shell, of the discharge flow discharged through the discharge port on the vertically lowermost side.
  • the ascending short-side flow that influences the flow velocity of the molten steel in the meniscus that is a determining factor in the entrapment of the mold powder is mainly formed by the ascending divergent flow, after the collision with the cast piece short-side solidified shell, of the discharge flow discharged through the discharge port on the vertically uppermost side.
  • both the ascending short-side flow and the descending short-side flow can be decelerated, which makes it possible to stably inhibit both the entrapment of the mold powder and capture of bubbles of the inert gas in the cast piece. Therefore, the quality of the cast piece can be improved when pouring molten steel into a mold for continuous casting using the immersion nozzle according to the present invention in continuous casting of steel.
  • FIG. 1 (a) is a longitudinal sectional view of an immersion nozzle according to one embodiment of the present invention, and (b) is a perspective view as seen from above discharge directions.
  • FIG. 2 is a view schematically showing a result of a study on a flow inside a mold in a water model experiment simulating a flow of molten steel inside a mold using the immersion nozzle according to the embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US18/849,311 2022-04-01 2023-02-07 Immersion nozzle for continuous casting and continuous casting method for steel Pending US20250196223A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2022061664 2022-04-01
JP2022-061664 2022-04-01
PCT/JP2023/003993 WO2023188837A1 (ja) 2022-04-01 2023-02-07 連続鋳造用の浸漬ノズルおよび鋼の連続鋳造方法

Publications (1)

Publication Number Publication Date
US20250196223A1 true US20250196223A1 (en) 2025-06-19

Family

ID=88201035

Family Applications (1)

Application Number Title Priority Date Filing Date
US18/849,311 Pending US20250196223A1 (en) 2022-04-01 2023-02-07 Immersion nozzle for continuous casting and continuous casting method for steel

Country Status (7)

Country Link
US (1) US20250196223A1 (zh)
EP (1) EP4484031A4 (zh)
JP (1) JP7388599B1 (zh)
KR (1) KR20240164926A (zh)
CN (1) CN118973739A (zh)
TW (1) TWI882305B (zh)
WO (1) WO2023188837A1 (zh)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3566904B2 (ja) * 1999-04-20 2004-09-15 新日本製鐵株式会社 鋼の連続鋳造方法
JP4456491B2 (ja) * 2005-01-20 2010-04-28 新日本製鐵株式会社 多孔浸漬ノズル及びこれを用いた連続鋳造方法
JP4724606B2 (ja) * 2006-06-05 2011-07-13 新日本製鐵株式会社 溶鋼の連続鋳造方法
JP5534666B2 (ja) 2008-10-31 2014-07-02 キヤノン株式会社 ドキュメント処理装置およびその制御方法、ドキュメント管理システムおよび該システムにおけるデータ処理方法並びにコンピュータプログラム
CN102361712B (zh) * 2009-03-25 2014-02-26 新日本制铁株式会社 连续铸造用浸渍喷嘴
JP5929872B2 (ja) * 2013-10-31 2016-06-08 Ｊｆｅスチール株式会社 鋼の連続鋳造方法
WO2017047058A1 (ja) * 2015-09-16 2017-03-23 Ｊｆｅスチール株式会社 スラブ鋳片の連続鋳造方法
JP2019063851A (ja) 2017-10-05 2019-04-25 Ｊｆｅスチール株式会社 連続鋳造用の浸漬ノズル及び鋼の連続鋳造方法
KR20190063851A (ko) 2017-11-30 2019-06-10 현대중공업 주식회사 래싱 브리지

Also Published As

Publication number Publication date
EP4484031A1 (en) 2025-01-01
CN118973739A (zh) 2024-11-15
TW202339871A (zh) 2023-10-16
TWI882305B (zh) 2025-05-01
JP7388599B1 (ja) 2023-11-29
JPWO2023188837A1 (zh) 2023-10-05
KR20240164926A (ko) 2024-11-21
EP4484031A4 (en) 2025-07-02
WO2023188837A1 (ja) 2023-10-05

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARAMAKI, NORICHIKA;MORITA, SHUGO;MATSUI, AKITOSHI;AND OTHERS;REEL/FRAME:068650/0184

Effective date: 20240902

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