US20220134420A1 - Immersion nozzle - Google Patents

Immersion nozzle Download PDF

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Publication number
US20220134420A1
US20220134420A1 US17/424,301 US202017424301A US2022134420A1 US 20220134420 A1 US20220134420 A1 US 20220134420A1 US 202017424301 A US202017424301 A US 202017424301A US 2022134420 A1 US2022134420 A1 US 2022134420A1
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Prior art keywords
immersion nozzle
protrusion
lateral
width
thickness
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US17/424,301
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English (en)
Inventor
Shinichi Fukunaga
Kazuhisa Katsuki
Junya Yano
Hiroki Furukawa
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Krosaki Harima Corp
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Krosaki Harima Corp
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Assigned to KROSAKIHARIMA CORPORATION reassignment KROSAKIHARIMA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATSUKI, Kazuhisa, FUKUNAGA, SHINICHI, FURUKAWA, HIROKI, YANO, JUNYA
Publication of US20220134420A1 publication Critical patent/US20220134420A1/en
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    • 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
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to an immersion nozzle for use in continuous casting to pour molten steel from tundish into a mold, and more particularly to an immersion nozzle, such as those used for continuous casting of a thin slab, a medium-thick slab or the like, which is flat in terms of transverse cross-section (cross-section in a direction perpendicular to a vertical direction) near a discharge port of the immersion nozzle.
  • immersion nozzle an immersion nozzle for continuous casting
  • the immersion nozzle is composed of a bottomed tubular body which has an upper end serving as an inlet of molten steel, and a molten steel flow passage (inner bore) internally formed to extend downwardly from the molten steel inlet, wherein a pair of discharge ports communicated with the molten steel flow passage (inner bore) are formed in a lateral wall of a lower portion of the tubular body in opposed relation to each other.
  • the immersion nozzle is used in a state in which the lower portion thereof is immersed in molten steel in a mold. This is intended to prevent scattering of poured molten steel, and further block contact of the molten steel with the atmosphere, thereby preventing oxidation thereof.
  • immersion nozzle is intended to allow the flow of molten steel in the mold to be straightened, thereby preventing impurities such as slag or non-metal inclusions floating on the surface of the molten steel from being entrained into the molten steel.
  • Patent Document 1 discloses a flat immersion nozzle in which a discharge port is provided in a short-side lateral wall; and in the below-mentioned Patent Document 2 discloses a flat immersion nozzle in which a discharge port is further provided in a lower end wall.
  • a flat immersion nozzle is configured such that the width of an inner bore thereof is increased between a molten steel inlet thereof and the discharge port in a direction from the molten steel inlet toward a mold.
  • the inner bore has a region where it is increased in terms of width, and flattened, the flow of molten steel inside the immersion nozzle becomes more likely to be disordered, and thus a discharge flow toward the mold also becomes more likely to be disordered. Resulting turbulence of the molten steel flow becomes a factor causing defective quality of slabs, an increase in danger during casting operation, etc., such as an increase in fluctuation of the surface of (molten steel) bath in the mold (in-mold bath surface), entrainment of a mold powder into a slab, or unevenness in temperature. Therefore, it is necessary to stabilize a molten steel flow inside the immersion nozzle and a molten steel flow during discharge.
  • Patent Document 3 discloses an immersion nozzle formed with at least two bending facets extending from a point (center) on a plane in a lower region of an inner bore toward a lower edge of a discharge port.
  • the Patent Document 3 also discloses an immersion nozzle comprising a flow divider for dividing a molten steel flow into two streams.
  • the stability of the molten steel flow inside the immersion nozzle are enhanced, as compared with the immersion nozzles disclosed in the Patent Documents 1 and 2, in which there is not any means to change a flow direction/pattern in an internal space thereof.
  • the means to divide the molten steel flow in a right-left direction is still likely to cause a situation where the fluctuation of the molten steel discharge flow between right and left discharge ports is increased, and thereby the fluctuation of the in-mold bath surface is increased.
  • the present inventors has found that, in continuous casting carried out under casting conditions, particularly, a condition of a molten steel flow rate of about 0.04 (t/(min ⁇ cm 2 )) or more, as measured with reference to the position of minimum cross-sectional area in a region around an upper end of the immersion nozzle where a transverse cross-section of the inner bore is a circular shape, even the flat immersion nozzle disclosed in the Patent Document 4 is still insufficient in terms of the intended effects such as stabilization of an in-mold bath surface.
  • a problem to be solved by the present invention is to provide a flat immersion nozzle capable of stabilizing an in-mold bath surface, i.e., reducing the fluctuation of the in-mold bath surface.
  • a protrusion protruding portion
  • a protrusion having a protruding thickness equal to or less than that of the central protrusion is provide beside the central protrusion to finely adjust a discharge flow direction, a discharge flow/pattern, or the like.
  • symmetrical lateral (laterally-offset) protrusions are provided, wherein a space having no protrusion is defined between the lateral protrusions, as a basic configuration, and optionally a protrusion having a protruding length less than that of each of the lateral protrusion is provided.
  • the molten steel flow inside the inner bore is guided such that the flow rate thereof becomes larger in a lateral direction (which means a width direction of a flat portion of the nozzle. this is also applied to the following description) than in a central and vertically downward direction.
  • a lateral direction which means a width direction of a flat portion of the nozzle.
  • the molten steel flow inside the inner bore is guided, while being adjusted to increase the flow rate thereof in the central and vertically downward direction, thereby relatively reducing the flow rate thereof in the lateral direction.
  • the ratio of the flow rate in the central and vertically downward direction/the flow rate in the lateral direction is relatively increased as compared with that in the structure of the flat immersion nozzle disclosed in the Patent Document 4.
  • the present invention intended to obtain the above flow pattern provides a flat immersion nozzle having features described in the following sections 1 to 8.
  • An immersion nozzle having a flat portion whose inner bore has a thickness Tn and a width Wn greater than the thickness Tn, and which comprises opposed short-side lateral walls and opposed long-side walls extending in a width direction of the flat portion, wherein a pair of discharge ports are provided, respectively, in lower parts of the short-side lateral walls.
  • the immersion nozzle comprises two portions provided on each of the width-directionally extending walls, and arranged at axial symmetrical positions with respect to a longitudinal central axis of the width-directionally extending walls, in pairs, wherein each of the portions extends obliquely downwardly in the width direction and protruding in a thickness direction of the flat portion (the portion will hereinafter be referred to as “lateral protrusion”), wherein two pairs of the lateral protrusions are arranged, respectively, on the width-directionally extending walls, in opposed relation, and wherein two sets of opposed lateral protrusions in the two pairs of lateral protrusions have a same value falling within a range of 0.18 to 0.90 in terms of a total protruding length Ts in the thickness direction, expressed as an index on the basis of 1 indicative of a thickness of the inner bore at a position where the opposed lateral protrusions are provided.
  • an upper end surface of the central protrusion has one selected from the group consisting of a shape extending horizontally in the width direction, a curved shape having a top at a midpoint thereof, and an upwardly protruding shape including a bending point.
  • an upper end surface of the lateral protrusion or the central protrusion has a shape extending horizontally in a direction toward a center of the inner bore, or a planar or curved shape extending obliquely downwardly in the direction toward the center of the inner bore.
  • width Wn and Tn of the inner bore means, respectively, a width (length in a long-side direction) and a thickness (length in a short-side direction) at positions of upper ends of the pair of discharge ports provided in the short-side lateral wall of the immersion nozzle.
  • the flat immersion nozzle of the present invention can control a molten steel flow to gradually increase/reduce the flow rate thereof in a continuous manner, without fixedly or completely separating the direction of the molten steel flow over the range from a central region to a lateral region inside the immersion nozzle, thereby ensuring an appropriate balance of molten steel flows within the immersion nozzle.
  • FIG. 1 is a conceptual diagram showing an example of an immersion nozzle of the present invention (an immersion nozzle according to a first embodiment of the present invention), which is provided with two pairs of lateral protrusions, wherein FIG. 1( a ) is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of the immersion nozzle, and FIG. 1( b ) is a schematic sectional view taken along a vertical plane passing through the center of a long side of the flat portion (taken along the line A-A in FIG. 1( a ) ).
  • FIG. 2 is a conceptual diagram showing another example of the immersion nozzle of the present invention (an immersion nozzle according to a second embodiment of the present invention), which is provided with the two pairs of lateral protrusions (lower lateral protrusions) in FIG. 1 and two pairs of upper lateral protrusions each at a position on the upper side of a respective one of the two pairs of lower lateral protrusions, wherein FIG. 2( a ) is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of the immersion nozzle, and FIG. 2( b ) is a schematic sectional view taken along a vertical plane passing through the center of a long side of the flat portion (taken along the line A-A in FIG. 2( a ) ).
  • FIG. 3 is a conceptual diagram showing yet another example of the immersion nozzle of the present invention (an immersion nozzle according to a third embodiment of the present invention), which is provided with the two pairs of lateral protrusions in FIG. 1 and two central protrusions each at a position between a respective one of the two pairs of lateral protrusions, wherein FIG. 3( a ) is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of the immersion nozzle, and FIG. 3( b ) is a schematic sectional view taken along a vertical plane passing through the center of a long side of the flat portion (taken along the line A-A in FIG. 3( a ) ).
  • FIG. 4 is a conceptual diagram showing still another example of the immersion nozzle of the present invention (an immersion nozzle according to a fourth embodiment of the present invention), which is provided with the two pairs of lateral protrusions (lower lateral protrusions) and the two central protrusions in FIG. 3 and two pair of upper lateral protrusions each at a position on the upper side of a respective one of the pair of lower lateral protrusions, wherein FIG. 4( a ) is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of the immersion nozzle, and FIG. 4( b ) is a schematic sectional view taken along a vertical plane passing through the center of a long side of the flat portion (taken along the line A-A in FIG. 4( a ) ).
  • FIG. 5 is a schematic sectional view taken along the vertical plane passing through the center of the short side in FIG. 3 or 4 , enlargedly showing a region where the central protrusion is provided between the pair of lateral protrusions, wherein a central part of the central protrusion is convexed upwardly to form a linear reverse-V or chevron shape, and a central part of a bottom protrusion is convexed upwardly to form a linear reverse-V or chevron shape.
  • FIG. 6 is a schematic top view of an inner bore of the immersion nozzle in FIG. 5 , showing a relationship between a set of opposed lateral protrusions and a set of opposed central protrusions.
  • FIG. 7 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , wherein an upper end of the central protrusion has a curved surface
  • FIG. 8 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , wherein the upper end of the central protrusion has a flat surface
  • FIG. 9 is a schematic sectional view taken along a vertical plane passing through the center of a long side of a flat portion of a modification of the immersion nozzle in FIG. 3 or 4 , wherein an upper surface of the lateral protrusion or the central protrusion is configured to extend obliquely downwardly in a direction toward the center of the inner bore.
  • FIG. 10 is a schematic top view showing a modification of the immersion nozzle in FIG. 5 , where the protruding length of the upper surface of each of the lateral protrusion and the central protrusion is constant (an inner bore-side edge of each of the lateral protrusion and the central protrusion is parallel to an width-directionally extending wall of the flat portion.
  • FIG. 11 is a schematic top view showing a modification of the immersion nozzle in FIG. 5 , where the protruding length of the upper surface of the central protrusion is linearly reduced toward a central region of the width-directionally extending wall.
  • FIG. 12 is a schematic top view showing a modification of the immersion nozzle in FIG. 5 , where the protruding length of the upper surface of the central protrusion is curvilinearly reduced toward the central region of the width-directionally extending wall.
  • FIG. 13 is a schematic top view showing a modification of the immersion nozzle in FIG. 5 , where the protruding length of the upper surfaces of the lateral protrusion and the central protrusion is linearly and continuously reduced toward the central region of the width-directionally extending wall.
  • FIG. 14 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , where the bottom protrusion has a flat upper surface.
  • FIG. 15 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , where the bottom protrusion has a curved upper surface.
  • FIG. 16 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , where the bottom protrusion is formed such that an upper surface thereof has a convex part on a central region thereof, and the diameter thereof gradually increases toward the bottom of the inner bore.
  • FIG. 17 is a schematic sectional view taken along a vertical plane passing through the center of a short side of a flat portion of a modification of the immersion nozzle in FIG. 5 , where the bottom protrusion is also provided with a molten steel discharge port.
  • FIG. 18 is a conceptual diagram showing a mold and the fluctuation of an in-mold bath surface (molten steel surface), wherein FIG. 18( a ) is a schematic top view of the vicinity of a bath surface (inner surface) of a mold, and FIG. 18( b ) is a schematic sectional view (one half in a longitudinal direction) of the vicinity of the bath surface (inner surface) of the mold, taken along a vertical plane passing through the center of a short side of the mold.
  • FIG. 19 is a graph showing the fluctuation (maximum value, average of right and left regions) of the in-mold bath surface (molten steel surface) in Inventive Example 3 in Table 1.
  • Molten steel flows toward width-directional ends can be formed to a certain degree by providing the flow dividing means as disclosed in the aforementioned Patent Document 3.
  • flow dividing means as disclosed in the aforementioned Patent Document 3.
  • such fixed and complete flow dividing is likely to generate molten steel flows separated in each region, i.e., in each small area, of an inner bore, leading to a situation where the flow direction and the flow velocity vary in each position of the inner bore.
  • significant turbulence is likely to occur in a discharge flow from the inside of an immersion nozzle into a mold, a bath surface, etc.
  • a pair of lateral protrusions 1 are first provided on one of opposed (long-side) walls extending in a width direction of a flat portion of an immersion nozzle 10 , axially symmetrically with respect to a central axis of the width-directionally extending wall (see FIG. 1( a ) , etc.; the pair of lateral protrusions will hereinafter be also referred to simply as “axial symmetrical lateral protrusions”),
  • Each of the pair of lateral protrusions 1 is configured such that an upper surface thereof is extends from a center-side end of the lateral protrusions 1 obliquely downwardly in the width direction of the flat portion, i.e., obliquely downwardly toward a respective one of a pair of discharge ports 4 .
  • Such an inclined surface makes it possible to gently change the flow velocity and flow pattern of molten steel from the inside of an inner bore 3 or the discharge port 4 , while suppressing the occurrence of a vortex flow or the like, thereby optimizing the flow velocity and flow pattern of the molten steel.
  • the pair of axial symmetrical lateral protrusions are also provided on the other width-directionally extending wall across the inner bore, in plane-symmetrical relation with respect to a thickness direction of the flat portion (see FIG. 1( b ) ; each of two sets of the lateral protrusions arranged in plane-symmetrical relation will hereinafter be also referred to simply as “plane-symmetrical lateral protrusions”).
  • plane-symmetrical lateral protrusions In the present invention, for example, as shown in FIG.
  • the total length Ts in the thickness direction of the plane-symmetrical lateral protrusions is set in the range of 0.18 to 0.90, when expressed as an index on the basis of 1 indicative of the thickness Tn of the inner bore at a position where the plane-symmetrical lateral protrusions are provided. That is, there is a space allowing molten steel to pass therethrough, between the plane-symmetrical lateral protrusions.
  • each lateral protrusion by adjusting the position, length, direction, etc., of each lateral protrusion, it becomes possible to avoid a molten steel flow concentrating on around the center or lateral sides, and diverge the molten steel flow into two directions toward width-directional ends, i.e., the discharge ports, and a direction toward the central region, while giving adequate balance to the diverged flows.
  • width-directional ends i.e., the discharge ports
  • each lateral protrusion can be appropriately adjusted, as mentioned above.
  • two pairs of lateral protrusions (assigned with the reference code 1 a in FIG. 2 ; each of the lateral protrusions 1 a will hereinafter be referred to as “lower lateral protrusion”)
  • two pairs of lateral protrusions (assigned with the reference code 1 b in FIG. 2 ; each of the lateral protrusions 1 b will hereinafter be referred to as “upper lateral protrusion”) are provided, respectively, above the two pairs of lower lateral protrusions.
  • a protrusion having a protruding length less than that of each of the axial symmetrical lateral protrusions may be provided between the axial symmetrical lateral protrusions, as in third and fourth embodiments illustrated FIGS. 3 and 4 . More specifically, in the third embodiment illustrated FIG. 3 , the central protrusion 1 p is provided between the axial symmetrical lateral protrusions 1 illustrated in FIG. 1 , and, in the fourth embodiment illustrated FIG. 4 , the central protrusion 1 p is provided between the axial symmetrical lower lateral protrusions 1 illustrated in FIG. 2 .
  • This structure brings out an effect opposite to that of a structure in which a protrusion (protrusion portion) having a protruding length greater than that of each of the axial symmetrical lateral protrusions is provided in the Patent Document 4 to allow the flow rate of a molten steel flow toward the lateral ends to become greater than that of a molten steel flow toward between the axial symmetrical lateral protrusions, i.e., an effect of increasing the ratio of the flow rate of the molten steel flow toward between the axial symmetrical lateral protrusions (central region)/the flow rate of the molten steel flow toward the lateral ends.
  • the balance of the molten steel flows to the central region and the lateral ends can be optimized by adjusting the magnitude of the molten steel flow velocity (molten steel flow rate per unit tine or per unit sectional area), a drawing speed, the size and shape of a mold, an immersion depth, a nozzle structure such as the area of the discharge port, etc.
  • the protruding length Tp/2 thereof is set to be less than the protruding length Ts/2 of the lateral protrusion 1 , wherein a total protruding length Tp expressed as an index on the basis of 1 indicative of the thickness of the inner bore at the position where the plane-symmetrical or opposed lateral protrusions are provided.
  • Tp ⁇ Ts wherein Tp/Tn ⁇ 0.40.
  • the upper end surface of the central protrusion may be formed in a shape extending horizontally in the width direction, as shown in FIG. 8 , or a curved shape having a top at a midpoint thereof, as shown in FIG. 5 , or an upwardly protruding shape including a bending point, as shown in FIG. 7 .
  • These shapes make it possible to further change the flow velocity and flow pattern of molten steel, thereby optimizing the flow velocity and flow pattern.
  • an upper end surface of the lateral protrusion or the central protrusion may be formed in a shape extending from a top thereof at a boundary with the width-directionally extending (long-side) wall of the flat portion of the immersion nozzle, obliquely downwardly in a direction toward a thickness-directional center of the flat portion of the immersion nozzle, i.e., a direction toward the center of the inner bore (toward a space).
  • This inclination makes it possible to further change the flow velocity and flow pattern of molten steel, thereby optimizing the flow velocity and flow pattern.
  • the protruding length of the upper end of the lateral protrusion or the central protrusion may be formed to be constant, as shown in FIG. 10 , or may be formed to become shorter in a direction toward the center of the width-directionally extending (long-side) wall of the flat portion of the immersion nozzle, as shown in FIGS. 11 to 13 . These inclinations make it possible to further change the flow velocity and flow pattern of molten steel, thereby optimizing the flow velocity and flow pattern.
  • the discharge port in each of the short-side lateral walls is configured to have an opening which is long in the longitudinal direction.
  • the discharge flow velocity is likely to be reduced in an upper region of the discharge port, and, particularly in the vicinity of an upper edge of the discharge port, a backflow phenomenon that molten steel is sucked into the immersion nozzle is often observed. Therefore, in the present invention, for example, as shown in FIGS. 2 and 4 , in addition to the aforementioned axial symmetrical and plain-symmetrical lower protrusions 1 a , one or more sets of axial symmetrical and plain-symmetrical protrusions (upper protrusions) 1 b may be provided thereabove.
  • the axial symmetrical and plain-symmetrical upper protrusions 1 b may be formed in a similar optimizing configuration to that of the axial symmetrical and plain-symmetrical lower protrusions 1 a.
  • the axial symmetrical and plain-symmetrical upper protrusions 1 b have a function of suppressing, particularly, decrease of the flow velocity in the upper region of the discharge port, or turbulence of a molten steel flow such as the backflow in the vicinity of the upper edge of the discharge port, to complement a function of uniforming the distribution of flow velocity in respective longitudinal positions of the discharge port, and a function of adjusting flow rate balance toward an upper limit.
  • a central protrusion may be provided between the axial symmetrical protrusions 1 b in a similar manner to the central protrusion between the axial symmetrical protrusions 1 a.
  • a bottom 5 of the immersion nozzle may be formed as a wall serving simply as a partition wall with respect to a mold without forming any discharge port around the center thereof, as shown in FIG. 14 , or may be formed in a configuration comprising a protrusion provided around the center thereof to protrude upwardly, as shown in FIGS. 1 to 5, 7, 8, 15 and 16 .
  • a discharge port 6 may be additionally in the bottom 5 , as shown in FIG. 17 .
  • Such a protrusion of the bottom is useful in changing the flow direction/pattern, flow velocity, etc., when changing a molten steel flow directed toward the ventral region to directions toward the discharge ports.
  • Example A is a result of water model experiments, showing a relationship between the ratio Ts/Tn or Tp/Tn of the protrusion length Ts of the opposed lower lateral protrusions 1 a toward a space of the inner bore of the immersion nozzle or the protrusion length Tp of the opposed central protrusions 1 p toward the space of the space of the inner bore (the total length of the plane-symmetrical protrusions) to the thickness (length in the short-side direction) Tn of the inner bore of the immersion nozzle, and a degree of fluctuation of the in-mold bath surface (in-mold uneven flow index, in-mold bath surface fluctuation height), with respect to each immersion nozzle according to the second embodiment of the present invention illustrated in FIG.
  • FIG. 4 which is provided with the two-stage axial symmetrical and plane-symmetrical lateral protrusions 1 a , 1 b are provided, wherein the central protrusion 1 p is not provided between each of the two pairs of lower lateral protrusions 1 a.
  • Conditions of a mold and a fluid are as follows.
  • the in-mold uneven flow index means a result obtained by measuring a flow velocity at a set bath surface (at an under-water position of 30 mm from a set upper surface of water) around each of the right and left discharge ports of the immersion nozzle in a mold, in the water model experiment, and expressing the right and left flow velocities as a ratio (absolute value), i.e., an absolute value of the left flow velocity/the right flow velocity (or the right flow velocity/the left flow velocity), and the in-mold bath surface fluctuation height means a maximum value of Sw in FIG. 18 .
  • the in-mold uneven flow index and the in-mold bath surface fluctuation height can satisfy the criterion.
  • Example B is a result of water model experiments, showing a degree of in-mole bath surface fluctuation when the upper end surface of each of the lower lateral protrusion 1 a and the central protrusion 1 p is formed in a planar shape extending obliquely downwardly toward the center of the inner bore, as shown in FIG. 9 , in the forth embodiment of the present invention illustrated in FIG. 4 .
  • the ratio Ts/Tn regarding the lower lateral protrusions and the ratio Tp/Tn regarding the central protrusions were set, respectively, to 0.74 and 0.18, and two cases where the inclination angle ( ⁇ in FIG. 9 ) of each of the lower lateral protrusion and the central protrusion toward the center of the inner bore was set to 0 degree (horizontal) and 45 degrees were compared with each other.
  • the remaining conditions are the same as those of Example A.
  • FIG. 19 A result is shown in FIG. 19 .
  • the vertical axis of FIG. 19 represents an average value of maximum bath surface fluctuation values Sw (mm) around the right and left discharge ports, in both the cases where the inclination angle is 0 degree and 45 degrees.
  • FIG. 19 shows that, in both the cases where the inclination angle is 0 degree and 45 degrees, the in-mold bath surface fluctuation height is significantly smaller than 15 mm as the criterion, and, in the case where the inclination angle is 45 degrees, the in-mold bath surface fluctuation height is reduced to 2.0 (mm), which is about 1 ⁇ 2 of 3.75 (mm) in the case where the inclination angle is 0 degree.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US17/424,301 2019-01-21 2020-01-15 Immersion nozzle Pending US20220134420A1 (en)

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JP2019007948A JP7134105B2 (ja) 2019-01-21 2019-01-21 浸漬ノズル
JP2019-007948 2019-01-21
PCT/JP2020/001078 WO2020153195A1 (ja) 2019-01-21 2020-01-15 浸漬ノズル

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CN (1) CN113226594B (ja)
BR (1) BR112021010225A2 (ja)
CA (1) CA3121954A1 (ja)
TW (1) TWI731561B (ja)
WO (1) WO2020153195A1 (ja)
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