EP4035795A1 - Structure de buse de panier de coulée et procédé de coulée en continu - Google Patents

Structure de buse de panier de coulée et procédé de coulée en continu Download PDF

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Publication number
EP4035795A1
EP4035795A1 EP20868567.7A EP20868567A EP4035795A1 EP 4035795 A1 EP4035795 A1 EP 4035795A1 EP 20868567 A EP20868567 A EP 20868567A EP 4035795 A1 EP4035795 A1 EP 4035795A1
Authority
EP
European Patent Office
Prior art keywords
upper nozzle
flange
tundish
shaped member
tundish upper
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.)
Withdrawn
Application number
EP20868567.7A
Other languages
German (de)
English (en)
Other versions
EP4035795A4 (fr
Inventor
Shinichi Fukunaga
Takuya Okada
Toshio Kaku
Hiroki Furukawa
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.)
Krosaki Harima Corp
Original Assignee
Krosaki Harima 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 Krosaki Harima Corp filed Critical Krosaki Harima Corp
Publication of EP4035795A1 publication Critical patent/EP4035795A1/fr
Publication of EP4035795A4 publication Critical patent/EP4035795A4/fr
Withdrawn legal-status Critical Current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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before 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
    • 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
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • 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

Definitions

  • the present invention relates to a tundish upper nozzle structure having a gas blowing function, and a continuous casting method using such a tundish upper nozzle structure.
  • the operation of continuous casting of steel is often carried out under gas blowing from a tundish upper nozzle.
  • the gas blowing is primarily intended to fulfill the following functions.
  • the gas blowing from a tundish upper nozzle has heretofore been performed in various configurations.
  • a stopper-receiving nozzle in the bottom of a tundish characterized in that it comprises two porous refractory members provided to define upper-side and lower-side molten steel contact surfaces, respectively, across the contact area with the stopper, wherein the nozzle is configured to be capable of blowing argon gas from each of the porous refractory members, independently.
  • each of the functions (1) to (3) and the function (4) is of a nature to be appropriately determined according to individual operation conditions (including know-how), steel grades, target quality and others.
  • a method is conceivable that comprises blowing gas into the tundish at any position of the bottom of the tundish other than the position of the tundish upper nozzle.
  • tundish upper nozzle in order to remove inclusions within the tundish by means of gas blowing, it is desirable to use the tundish upper nozzle to form a floating flow of gas in molten steel within the tundish, and adjust the rate (percentage) of the floating flow.
  • a technical problem to be solved by the present invention is to provide a tundish upper nozzle structure configured to blow gas from a tundish upper nozzle, wherein the tundish upper nozzle structure is capable of cause the entirety of gas blown from a specific location of the tundish upper nozzle to float (upwardly from the tundish upper nozzle) within a tundish, or arbitrarily adjust a balance between the flow rate of gas flowing toward the inner bore of the tundish upper nozzle or downwardly, and the flow rate of gas floating (upwardly from the tundish upper nozzle) within the tundish, and a continuous casting method using the tundish upper nozzle structure.
  • one tundish upper nozzle varies in terms of a discharge position, the configuration of a discharge hole, such as a porous body or a through-hole, the number of discharge holes, and others, and as used in this specification, the term "the entirety of gas blown from a specific location of the tundish upper nozzle” means the entirety of gas discharged from a single gas flow-out portion, in other words, "the entirety of gas discharged from a single through-hole, or, when focusing on a plurality of discharge holes including a porous body or the like, which are actually composed of a set of very small discharge holes configured such that a plurality of gas bubbles at the time just after discharge merge into a single gas babble, i.e., form a single gas babble, the entirety of gas discharged from each of the set of very small discharge holes, but does not mean the entirety of gas discharged from the one tundish upper nozzle.
  • the present inventors have found that, the reason why gas blown from the vicinity of an upper end of the tundish upper nozzle mostly flows toward the inner bore of the tundish upper nozzle, and thus fails to float upwardly, i.e., in molten steel within the tundish, as in the above-mentioned Patent Publications is that in the vicinity of the gas discharge hole adjacent to the upper end of the tundish upper nozzle, a molten steel flow directed toward the inner bore of the tundish upper nozzle becomes mainstream, and is stronger than the floating flow of gas babbles.
  • the subject matter of the present invention is a tundish upper nozzle structure which is capable of discharging gas at a position where the flow velocity of molten steel flowing into an inner bore of a tundish upper nozzle is less than the flow velocity of a floating flow of gas bubbles, so as to allow the floating flow of gas bubbles to become stronger than a molten steel flow directed toward the inner bore of the tundish upper nozzle, and adjusting a balance between the flow rate of gas flowing toward the inner bore of the tundish upper nozzle, and the flow rate of gas floating upwardly, and a continuous casting method using the tundish upper nozzle structure.
  • the present invention relates to a tundish upper nozzle structure having features described in the following sections 1 to 11, and a continuous casting method having a feature described in the following section 12.
  • the flange-shaped member having an outside dimension greater than that of an upper end of the tundish upper nozzle is provided along a part or the entirety of the circumference of the upper end of the tundish upper nozzle, so that it is possible to lead gas to the side of the outer periphery of the tundish upper nozzle, i.e., to a region where the flow velocity of molten steel toward the inner bore is relatively small, and direct the gas upwardly from the vicinity of the region.
  • This makes it possible to cause the gas to float within the tundish, and obtain an effect of causing inclusions to float within the tundish.
  • a length from the position on the vertical extension of the lower end of the inner bore to the gas discharge hole in the flange-shaped member having an outside dimension greater than that of the upper end of the tundish upper nozzle, or a gas discharge area, i.e., a location where gas is released upwardly after flowing along the flange-shaped member (the length L) can be arbitrarily adjusted to arbitrarily adjust the flow rate of gas flowing downwardly toward the inner bore of the tundish upper nozzle and the flow rate of gas floating within the tundish.
  • FIG. 1 shows a relevant part of a tundish upper nozzle structure according to one embodiment of the present invention.
  • the tundish upper nozzle structure 10 is used for operation of continuous casting of steel in which the flow rate of molten steel is controlled by a stopper 20.
  • the tundish upper nozzle structure 10 comprises: a tundish upper nozzle 11; and a flange-shaped member 12 having an outside dimension (outside diameter) greater than that of an upper end of the tundish upper nozzle, wherein the flange-shaped member is provided along the entirety of the outer periphery (circumference) of the upper end of the tundish upper nozzle.
  • the tundish upper nozzle structure 10 has a plurality of (six) gas discharge holes 13a provided in a region of an outer peripheral surface of the tundish upper nozzle 11 below the flange-shaped member 12 (at even intervals in a circumferential direction of the tundish upper nozzle 11).
  • the tundish upper nozzle structure 10 according to this embodiment also has a plurality of (twenty-four) gas discharge holes 13b provided in a top surface of the tundish upper nozzle 11 (at even intervals in the circumferential direction of the tundish upper nozzle 11).
  • the tundish upper nozzle structure 10 is configured such that, in a state in which it is attached to a tundish 30, a space S allowing gas to pass therethrough is defined along a part or the entirety of a lower surface of the flange-shaped member 12 (during casting, the inside of the tundish is filled with molten steel, and therefore molten steel exists in this apace).
  • the tundish upper nozzle structure 10 is provided with the flange-shaped member 12, so that it is possible to lead gas to the side of the outer periphery of the tundish upper nozzle 11 (in the direction of the arrowed line B), i.e., to a region where the flow velocity of molten steel toward an inner bore 11a of the tundish upper nozzle 11 (in the direction of the arrowed line A) is relatively small, and direct the gas upwardly from the vicinity of the region.
  • This makes it possible to cause the gas to float within the tundish 30, and obtain an effect of causing inclusions to float within the tundish 30.
  • the present inventors have further found that respective rates of the flow rate of gas flowing downwardly toward the inner bore 11a and the flow rate of gas floating within the tundish 30 is highly dependent on a length L (mm) and a casting speed M (t/min) indicated in FIG. 1 .
  • the length L indicated in FIG. 1 means a length from a position on a vertical extension of an inner bore surface 11b at a lower end of the tundish upper nozzle 11 to a gas discharge hole in a top surface of the flange-shaped member 12 or an outer peripheral surface of the flange-shaped member 12, and the casting speed M (t/min) indicated in FIG. 1 is synonymous with the throughput of molten steel.
  • this length L is measured based on the position on the vertical extension of the inner bore surface 1 1b at the lower end of the tundish upper nozzle 11 is that the outer periphery and the vicinity of the upper end of the tundish upper nozzle 11 can be designed to have various shapes, whereas the position of the inner bore surface at the lower end (which is approximately equivalent to an inner bore diameter) is almost unchanged at similar casting speeds, i.e., there is no significant difference in the velocity of molten steel flowing into the inner bore, and that, in stopper control, a fitting position of the stopper is located at approximately the same radial position along with the inner bore diameter.
  • the present inventors have found that, when the length L (mm) satisfies the following formula 1, it is possible to cause almost the entirety of gas to float within the tundish, and the length L (mm) satisfies the following formula 2, it is possible to adjust the flow rate of gas flowing downwardly toward the inner bore (inner bore-side gas) and the flow rate of gas floating upwardly (floating gas).
  • L ⁇ ⁇ 1.875 M 2 + 26.332 M ⁇ 0.3929 L ⁇ ⁇ 1.875 M 2 + 26.332 M ⁇ 0.3929
  • control of the rate of the inner bore-side gas or the floating gas is performer with respect to each gas to be discharged from the respective discharge holes.
  • the length L is set with respect to each gas discharge hole, irrespective of whether the number of the gas discharge holes is one or plural.
  • the length L means a length to the outer peripheral surface of the flange-shaped member.
  • the ratio of the inner bore-side gas to the floating gas according to the above formulas is determined by the length L (mm). Whether or not to make them coexist, and how to set the number are related to control of the gas discharge amount and mode as the entire tundish upper nozzle structure, and may be set depending on individual operation conditions (arbitrarily).
  • FIG. 2 The right-hand side of the formulas 1 and 2 can be graphically shown as FIG. 2 which means that, when the length L is on or in a region above an approximate line in FIG. 2 , it is possible to cause almost the entirety of gas to float upwardly, and when the length L is in a region below the approximate line, it is possible to adjust the flow rate of gas flowing downwardly toward the inner bore and the flow rate of gas floating upwardly.
  • the present inventors have found that when the diameter of the gas discharge hole is 0.3 mmcp, the gas bubble diameter in water (water model) is in the range of about 1.5 to 3.5 mmcp, whereas the gas bubble diameter in molten steel becomes 2 to 3 times, and that the gas bubble diameter when using the 0.3 mm ⁇ through-hole is almost the same as the gas bubble diameter when using an alumina-graphite based porous material (so-called "porous refractory material", average pore size: about 100 to 200 ⁇ m).
  • the length L (mm) can be set to be equal to or greater than a boundary length LB (mm) satisfying the formula 3 to cause almost the entirety of the gas to float upwardly, or can be set to be less than the boundary length LB (mm) to adjust the flow rate of gas flowing downwardly toward the inner bore and the flow rate of gas floating upwardly.
  • the vertical axis L (mm) is a length from the position on the vertical extension of the inner bore surface 11b at the lower end of the tundish upper nozzle, it includes the wall thickness of the tundish upper nozzle at an installation position of the flange-shaped member.
  • the presence of the flange-shaped member in the present invention is conditional on satisfying the following relationship: the wall thickness (mm) ⁇ LB (mm).
  • FIG. 1 Some modifications of the above embodiment ( FIG. 1 ) will be described below.
  • the flange-shaped member 12 is provided along the entirety of the outer periphery (circumference) of the upper end of the tundish upper nozzle 11.
  • the flange-shaped member 12 may be provided along a part of the outer periphery (circumference) of the upper end of the tundish upper nozzle 11. Even if the flange-shaped member 12 is provided along a part of the outer periphery of the upper end of the tundish upper nozzle 11, it is possible to obtain the effect of causing gas to float within the tundish (the effect of causing inclusions to float within the tundish) more than a little.
  • a plan-view shape of the flange-shaped member 12 is not limited to a circular shape, but may be, e.g., an elliptical shape or a polygonal shape.
  • the gas discharge hole 13a is provided plurally (six at even intervals in the circumferential direction) in a region of the outer peripheral surface of the tundish upper nozzle 11 below the flange-shaped member 12.
  • the gas discharge hole 13a may be provided by the number of one or more, in one or more of the lower surface, the outer peripheral surface and the top surface of the flange-shaped member 12.
  • the gas discharge hole 13a of the flange-shaped member 12 may be an end of a gas distribution passage which is an internal space of the flange-shaped member 12, or a through-hole penetrating between the lower surface and the top surface of the flange-shaped member 12.
  • the space S allowing gas to pass therethrough is defined along the lower surface of the flange-shaped member 12.
  • the lower surface of the flange-shaped member 12 may be provided with one or more grooves each allowing gas to pass therethrough.
  • the groove includes a configuration in which the lower surface of the flange-shaped member 12 is curved in the circumferential direction such that a part of the lower surface in the circumferential direction is formed as an upwardly concave portion, and the upwardly concave portion is extended in the radial direction. That is, the groove may have a structure serving as a gas distribution passage capable of causing gas to flow in a direction toward the outer periphery of the flange-shaped member 12 in a concentrated manner.
  • a porous refractory material having high gas-permeability may be provided at the position of the space S.
  • the flange-shaped member 12 is joined to the tundish upper nozzle 11 by an adhesive.
  • the flange-shaped member 12 may be joined to the tundish upper nozzle 11 by a screw, or a bayonet structure,
  • the flange-shaped member 12 may be fitted onto the outer periphery of the tundish upper nozzle 11, and joined to a tuyere 31 adjacent to the tundish upper nozzle 11, or a refractory layer 32 in the bottom of the tundish (tundish bottom refractory layer 32).
  • the joining may be achieved by a screw, or a bayonet structure, or an adhesive.
  • the tundish upper nozzle structure 10 is used for operation of continuous casting of steel in which the flow rate of molten steel is controlled by the stopper 20.
  • the tundish upper nozzle structure of the present invention may be used for operation of continuous casting of steel in which the flow rate of molten steel is controlled by a sliding nozzle device. That is, the present invention may be applied to a structure in which there is no so-called obstruction for changing the flow of molten steel, above the tundish upper nozzle.
  • the thickness of adhered alumina inside the tundish upper nozzle in each of the inventive structures was indexed on the assumption that the thickness of adhered alumina inside the tundish upper nozzle in the conventional structure was set to 100.
  • a smaller value of the index of the thickness of adhered alumina inside the tundish upper nozzle means a smaller value of the thickness of adhered alumina inside the tundish upper nozzle.
  • the number of occurrences of the surface defect of the coil in each of the inventive structures was indexed on the assumption that the number of occurrences of the surface defect of the coil in the conventional structure was set to 1.0.
  • a smaller value of the index of the number of occurrences of the surface defect of the coil means a smaller value of the number of occurrences of the surface defect of the coil, i.e., better quality of slab.
  • Table 1 shows a result of the continuous casting test.
  • the casting speed throughput of molten steel
  • the boundary length LB in the formula 3 is about 60 mm.
  • the floating volume (rate) of gas bubbles is an index on the assumption that the total flow of gas is set to 100, and is based on an estimated value (Inventive Examples) from visual observation, water model experiment or the like, wherein 100 means that almost the entirety of gas bubbles floats upwardly, and 0 means that the entirety of gas bubbles flows toward the inner bore.
  • inventive structure in which the length L is less than the boundary length LB (about 60 mm) shows that the length L (mm) can be adjusted to adjust the ratio of the floating volume of gas bubbles to the inner bore-side volume of gas bubbles, thereby adjusting quality of slab.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Valve Housings (AREA)
EP20868567.7A 2019-09-26 2020-09-17 Structure de buse de panier de coulée et procédé de coulée en continu Withdrawn EP4035795A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019175256A JP2021049564A (ja) 2019-09-26 2019-09-26 タンディッシュ上ノズル構造体及び連続鋳造方法
PCT/JP2020/035165 WO2021060122A1 (fr) 2019-09-26 2020-09-17 Structure de buse de panier de coulée et procédé de coulée en continu

Publications (2)

Publication Number Publication Date
EP4035795A1 true EP4035795A1 (fr) 2022-08-03
EP4035795A4 EP4035795A4 (fr) 2023-02-08

Family

ID=75155231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20868567.7A Withdrawn EP4035795A4 (fr) 2019-09-26 2020-09-17 Structure de buse de panier de coulée et procédé de coulée en continu

Country Status (7)

Country Link
US (1) US20220324017A1 (fr)
EP (1) EP4035795A4 (fr)
JP (1) JP2021049564A (fr)
CN (1) CN114040823A (fr)
BR (1) BR112022001629A2 (fr)
TW (1) TWI770616B (fr)
WO (1) WO2021060122A1 (fr)

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3168852D1 (en) * 1981-03-11 1985-03-28 Junichi Ato Porous nozzle for molten metal vessel
US4360190A (en) * 1981-03-16 1982-11-23 Junichi Ato Porous nozzle for molten metal vessel
FR2516415A1 (fr) * 1981-11-13 1983-05-20 Daussan & Co Dispositif pour eliminer les inclusions contenues dans les metaux liquides
GB2149699B (en) * 1983-11-18 1987-03-11 Uss Eng & Consult Method and apparatus for avoiding vortexing in a bottom pour vessel
CH657075A5 (de) * 1984-11-26 1986-08-15 Cometus Ag Verfahren zum spuelen von metallschmelzen, mit einem durch einen spuelstein gefuehrten gas, und spuelstein zur ausfuehrung des verfahrens.
JPH054933Y2 (fr) * 1987-08-27 1993-02-08
JPH01284473A (ja) * 1988-05-11 1989-11-15 Toshiba Ceramics Co Ltd 溶融金属排出装置
JPH04100662A (ja) * 1990-08-20 1992-04-02 Kawasaki Refract Co Ltd 溶融金属容器の溶湯流出方法
GB9212953D0 (en) * 1992-06-18 1992-07-29 Foseco Int Purifying molten metal
JPH06297118A (ja) 1993-04-12 1994-10-25 Nippon Steel Corp タンディッシュ底部のストッパー受けノズル
US5723055A (en) * 1995-10-10 1998-03-03 Vesuvius Crucible Company Nozzle assembly having inert gas distributor
GB9522217D0 (en) * 1995-10-31 1996-01-03 Shaw Richard D Gas-porous nozzle
JPH09314294A (ja) * 1996-05-28 1997-12-09 Akechi Ceramics Kk 連続鋳造用浸漬ノズル
JPH1034299A (ja) * 1996-07-26 1998-02-10 Nippon Steel Corp 注入装置
FR2765126B1 (fr) * 1997-06-26 1999-07-30 Lorraine Laminage Procede de coulee de metal liquide dans un conduit comprenant au moins deux pieces refractaires
JP4252661B2 (ja) * 1999-03-09 2009-04-08 日新製鋼株式会社 タンデイッシュノズル部の構造
JP4210063B2 (ja) 2002-01-28 2009-01-14 日新製鋼株式会社 タンディッシュノズル
JP4139366B2 (ja) * 2004-08-26 2008-08-27 黒崎播磨株式会社 ガスを吹き出す機能を有する溶融金属排出ノズル
TWI466844B (zh) * 2011-12-01 2015-01-01 Krosakiharima Corp Refractory and casting nozzles
JP2016182612A (ja) 2015-03-25 2016-10-20 株式会社神戸製鋼所 上ポーラス耐火物及び下ポーラス耐火物から不活性ガスを吹き込む連続鋳造方法
JP6515388B2 (ja) * 2015-10-02 2019-05-22 日本製鉄株式会社 連続鋳造用の上ノズル
JP6663230B2 (ja) * 2016-01-25 2020-03-11 黒崎播磨株式会社 ノズル構造体
JP6649795B2 (ja) * 2016-02-19 2020-02-19 黒崎播磨株式会社 浸漬ノズルの交換方法

Also Published As

Publication number Publication date
EP4035795A4 (fr) 2023-02-08
CN114040823A (zh) 2022-02-11
WO2021060122A1 (fr) 2021-04-01
US20220324017A1 (en) 2022-10-13
BR112022001629A2 (pt) 2022-04-19
JP2021049564A (ja) 2021-04-01
TWI770616B (zh) 2022-07-11
TW202128310A (zh) 2021-08-01

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