CN102781605A - Continuous casting method for molten metal - Google Patents
Continuous casting method for molten metal Download PDFInfo
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- CN102781605A CN102781605A CN2010800503246A CN201080050324A CN102781605A CN 102781605 A CN102781605 A CN 102781605A CN 2010800503246 A CN2010800503246 A CN 2010800503246A CN 201080050324 A CN201080050324 A CN 201080050324A CN 102781605 A CN102781605 A CN 102781605A
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- side opening
- body system
- refractory body
- system structure
- motlten metal
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 130
- 239000002184 metal Substances 0.000 title claims abstract description 130
- 238000009749 continuous casting Methods 0.000 title abstract description 48
- 238000000034 method Methods 0.000 title abstract description 21
- 239000007921 spray Substances 0.000 claims description 81
- 238000007598 dipping method Methods 0.000 claims description 78
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000005470 impregnation Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 abstract description 24
- 238000007654 immersion Methods 0.000 abstract 3
- 238000005266 casting Methods 0.000 description 69
- 229910000831 Steel Inorganic materials 0.000 description 39
- 239000010959 steel Substances 0.000 description 39
- 230000000694 effects Effects 0.000 description 27
- 230000006641 stabilisation Effects 0.000 description 16
- 239000002893 slag Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VIJYFGMFEVJQHU-UHFFFAOYSA-N aluminum oxosilicon(2+) oxygen(2-) Chemical compound [O-2].[Al+3].[Si+2]=O VIJYFGMFEVJQHU-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010018265 Gigantism Diseases 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- -1 molten steel Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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
- B22D41/507—Pouring-nozzles giving a rotating motion to the issuing 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
-
- 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
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- 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
- B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Provided is a continuous casting method for molten metal, wherein a hollow cylindrical, conical or truncated conical refractory structure provided with one or more side holes in the side wall thereof is disposed above an immersion nozzle in a tundish with the axis of the refractory structure disposed vertically, and molten metal is supplied from the tundish into the immersion nozzle. In said continuous casting method for molten metal, the angle formed by a virtual line extending radially from the center of a circular cross-section in the horizontal direction of the refractory structure and the central axis of the side hole is an angle ([theta]1), the swirling flow of the molten metal supplied into the immersion nozzle is formed by causing the molten metal in the tundish to pass through the side hole, and the flow velocity (Q) of the molten metal, the total opening area (S) of the side hole, the mean internal radius (R) of the circular cross-section in the horizontal direction in a portion in which the side hole is bored, and the angle ([theta]1) satisfy 0.015m2/s<=RQ/SSin[theta]1<=0.100m2/s. By providing a swirling flow imparting mechanism in the tundish, the flow of the molten metal in a mold can be stabilized.
Description
Technical field
The present invention relates in the continuous casting of motlten metals such as molten steel, to apply the technology of the stream that circles round through the motlten metal in the dipping spray nozzle.The stabilisation that the situation that applies the stream that circles round through the motlten metal in the dipping spray nozzle is helped reaching in the dipping spray nozzle molten metal flow in the casting mold.
Background technology
In the continuous casting of the casting mold that as the continuous casting of slab, uses wide cut, generally, come supplying melting metal through a dipping spray nozzle with opposed squit hole.In this case, the mobile meeting in the casting mold produces self-excited vibration, thereby causes the change of flow velocity or the fluctuating of motlten metal face.Consequently, in order to prevent to cast the quality defect of sheet skin section, and require to reduce casting speed.
In the past, with the purpose that is controlled to be that flows in the casting mold, known had electromagnetic brake or the electromagnetic agitation of having used electromagnetic force or in patent documentation 1 or patent documentation 2 etc., disclosed the dipping spray nozzle that such applying circled round and flowed.In above-mentioned patent documentation 1, put down in writing a kind of possess be used for molten steel stream is applied the dipping spray nozzle that tabular parts form that reverses that circles round.And; In patent documentation 2, put down in writing a kind of continuous casting and used dipping spray nozzle; Be provided with in the dipping spray nozzle that reverses the template swirl vanes in inside, making the external diameter of swirl vanes twist pitch, swirl vanes torsion angle, swirl vanes, the thickness of swirl vanes is the value in the prescribed limit, between swirl vanes lower end and squit hole, reduces internal diameter; And the cross-sectional area after the regulation reduction, the predicted value of the necessity between tundish and casting mold is suppressed in the proper range.
In addition, the dipping spray nozzle that the known degree of depth that the disclosed pitlike depression with nozzle bottom of patent documentation 3 arranged has increased, or the patent documentation 4 disclosed dipping spray nozzles that are provided with difference of height at nozzle inside diameter.In above-mentioned patent documentation 3, disclose a kind of continuous casting and used dipping spray nozzle; Have the inboard that is positioned at casting sheet minor face wall nozzle body, be formed on the sidewall of nozzle body and towards casting sheet minor face wall and to the box body of the bottom concavity of the squit hole of under shed, nozzle body, and stipulated the degree of depth of box body and the ejection angle of the ratio and the squit hole of internal diameter.And; In patent documentation 4, disclose a kind of dipping spray nozzle, in casting continuously with dipping spray nozzle, the refractory material that constitutes the part of joining with molten steel contains graphite; And have a plurality of difference of height structures in nozzle endoporus portion; The difference of height structure position of this difference of height structure has length, wherein, comes minimum diameter, the smallest cross-section area of regulation nozzle endoporus portion, the sectional area of squit hole with respect to molten steel through amount.
Yet, use the method for electromagnetic force because equipment cost is high, be difficult to obtain the advantage that is suitable for investing.Owing to be difficult to the motlten metal stream of instrumentation as the control object, therefore requirement is not held the state of control object and is controlled.Thereby, be difficult to bring into play effect of sufficient technically.
On the other hand, the relevant technology of said patent documentation 1 or 2 disclosed and the dipping spray nozzles that apply the stream that circles round (below, be also referred to as " circle round stream apply dipping spray nozzle ") has been confirmed its validity as the real countermeasure of the stabilisation that can realize flowing in the casting mold.Yet, when containing the more motlten metal of non-metallic inclusion and cast, because, therefore there is the problem of the motlten metal that is difficult to cast continuously volume easily attached on the swirl vanes that is provided with in the nozzle in non-metallic inclusion.
If use 3 of patent documentations to open the dipping spray nozzle that shows,,, in practical operation, be difficult to obtain stable being involved in and prevent effect though can prevent being involved in of casting powder effectively though the surface velocity that then increases in the casting speed casting mold does not increase.Patent documentation 4 disclosed dipping spray nozzles prevent that aluminium oxide from adhering to the obturation of the dipping spray nozzle that causes, and realize the homogenising that flows in the casting mold through the bias current that suppresses the molten steel in the dipping spray nozzle, with the raising of casting sheet quality and burn prevent to be purpose.Yet, even if use such nozzle, in the casting operation of reality, also be easy to generate spray nozzle clogging, also be difficult to obtain stable bias current and suppress effect.
The present inventor has made the invention shown in patent documentation 5 and the patent documentation 6 as solution to the problems described above.Easy and the resultful stream applying mechanism that circles round of the circle round stream of these inventions through in tundish, being provided for forming motlten metal, eliminating the shortcoming that the stream that circles round with above-mentioned swirl vanes applies dipping spray nozzle is spray nozzle clogging.Consequently, the molten metal flow in the casting mold realizes stabilisation, and can expect that the quality of stable casting operation and casting sheet improves.
[technical literature formerly]
[patent documentation]
[patent documentation 1]: WO99/15291 communique
[patent documentation 2]: TOHKEMY 2002-239690 communique
[patent documentation 3]: No. 3027645 communique of Japan Patent
[patent documentation 4]: No. 3207793 communique of Japan Patent
[patent documentation 5]: TOHKEMY 2007-69236 communique
[patent documentation 6]: TOHKEMY 2008-300069 communique
Yet it is in the technology essential factor that patent documentation 5 and patent documentation 6 are put down in writing that the present inventor further advances the result of research and development, and the effect that estimates the stabilisation of the molten metal flow in the casting mold may not be abundant.
Summary of the invention
The present invention is in view of this problem and making, and its problem is to provide the continuous casing of the effect of the stabilisation that a kind of invention of being put down in writing than patent documentation 5 and patent documentation 6 further improved the molten metal flow in the casting mold.
The present inventor is in order to solve above-mentioned problem; Discussed and investigated the spray nozzle clogging that can not cause dipping spray nozzle repeatedly; And the motlten metal stream through dipping spray nozzle is applied the stream that circles round, and can realize the casting method of the stabilisation of the molten metal flow in the casting mold, consequently; Obtain the opinion of following (a)～(g), and accomplished the present invention.
(a) in dipping spray nozzle, be provided with and reverse in the method that tabular swirl vanes forms the stream that circles round, when the motlten metal sinking in the dipping spray nozzle contacts with swirl vanes, can produce mobile silt water or vortex, thereby cause Al
2O
3Deng adhering to of non-metallic inclusion.And, in the big dipping spray nozzle of flow velocity, be provided with and reverse such the circling round when flowing applying mechanism of tabular swirl vanes, exist the molten metal flow resistance to become big and the low problem of energy efficiency that circle round and apply.Thereby when necessary output was big, the intensity of circling round that can form was limited.
(b) considered to have in the tundish above dipping spray nozzle the side of cylindric, the coniform or circular cone shape of the bigger hollow of diameter, and be provided with the stream applying mechanism that circles round that the motlten metal that flows into is applied the side opening of circumferential velocity component in this side.Therefore this stream applying mechanism that circles round can reduce the flow velocity through the motlten metal of the stream applying mechanism that circles round because big as the sectional area of the side opening of motlten metal stream.
(c) structure of above-mentioned through forming (b), and become mobile silt water or the difficult stream shape that produces of vortex so Al
2O
3The inwall that is difficult for being attached to the motlten metal stream Deng non-metallic inclusion.Even if under the situation of adhering to,, therefore also be difficult for causing obturation because flow path cross sectional area is big.And the situation that low flow velocity and mobile vortex are difficult for producing can realize little molten metal flow resistance, therefore can apply flexibly the position energy effectively, thereby can access the stream that circles round by force.
(d) in order to obtain the molten metal flow in the casting mold is caused the circling round of suitable intensity of influence, and in the moment through side opening, the moment of momentum that circling round of the motlten metal that in the stream applying mechanism that circles round of above-mentioned (b), forms flowed is suitable.
(e), considered to use the index P that representes by following (1) formula of the shape of the flow of motlten metal and the stream applying mechanism that circles round as the index of the moment of momentum of the stream that circles round that is formed on the motlten metal in the dipping spray nozzle.The mode that becomes the suitable scope of regulation through the value with the index P stream applying mechanism that will circle round is designed to suitable shapes, and has obtained the stream that circles round of suitable intensity.
P＝R×Q/S×Sinθ1……(1)
Here, each mark in above-mentioned (1) formula is represented each following amount.R: the mean inner radius of the circular cross-section of the horizontal direction of the stream applying mechanism that circles round of the part of side opening opening; Q: the flow speed of motlten metal; S: total aperture area of side opening, θ 1: at the central shaft that goes out side opening portion place side opening with respect to the imaginary line angulation.Total aperture area S of side opening is meant the summation of the flow path cross sectional area of whole side openings, and the Q/S in above-mentioned (1) formula representes that the side opening of motlten metal passes through mean flow rate.
When (f) side opening of the stream applying mechanism that circles round of above-mentioned (b) applied circumferential flow velocity to motlten metal, the value of the index T (width of the thickness/side opening of T=side opening portion sidewall) that minimum is necessary corresponding to the mean flow rate Q/S of side opening existed.Promptly; T need be more than 1.0 during less than 0.05m/s at Q/S respectively; At Q/S is to be more than 0.8 during more than the 0.05m/s and less than 0.1m/s; At Q/S is to be more than 0.6 during more than the 0.1m/s and less than 0.4m/s, is to be more than 0.5 during more than the 0.4m/s and less than 1.2m/s at Q/S, is that 1.2m/s is the value more than 0.4 when above at Q/S.
(g) when the stream applying mechanism that circles round of above-mentioned (b) impregnated in the motlten metal in the tundish,, then can cause from the motlten metal face in the tundish and flow the vortex in the applying mechanism to circling round if there is peristome in the upper end of the stream applying mechanism that circles round.This vortex can be involved in slag or the non-metallic inclusion on the tundish motlten metal face, and is therefore not preferred.In order to prevent this vortex, and require peristome not to be set, or insert the bridle that the portion of wrapping extends from the centre at the peristome of the upper end of the stream applying mechanism that circles round in the upper end of the stream applying mechanism that circles round.
The present invention is based on above-mentioned opinion and accomplish, its aim is the continuous casing of the motlten metal shown in following (1)～(4).
(1) a kind of continuous casing of motlten metal; To be that the mode of vertical is configured in above the dipping spray nozzle in the tundish at the refractory body system structure of cylindric, coniform or circular cone shape that sidewall is provided with the hollow of more than one side opening with the axle of this refractory body system structure; And from said tundish supplying melting metal in dipping spray nozzle; The continuous casing of said motlten metal is characterised in that; The central shaft that is imaginary line and the said side opening of radial extension from the center of the circular cross-section of the horizontal direction of said refractory body system structure intersects and forms intersection point at the inner surface of said refractory body system structure; At this intersection point place; The central shaft of said side opening is angle θ 1 with respect to this imaginary line inclination angulation; Through the motlten metal in the said tundish is passed through towards the side opening portion that goes out in the inner surface upper shed of said refractory body system structure from the side opening portion of going at the said side opening of the outer surface upper shed of said refractory body system structure; Thereby the motlten metal of in said dipping spray nozzle, supplying with from said tundish is applied circumferential flow velocity with the formation stream that circles round; The mean inside diameter 2R of the circular cross-section of the said horizontal direction of the part of said side opening opening is 250mm～1200mm; The height of said side opening is that 30mm～500mm and said angle θ 1 are 15 °～80 °, be made up of mean inner radius R, the said angle θ 1 of the circular cross-section of the said horizontal direction of the part of total aperture area S of the flow speed Q of said motlten metal, said side opening, said side opening opening, and the index P that is represented by following (1) formula satisfies 0.015m
2/ s≤P≤0.100m
2/ s (below, be also referred to as " first invention ").
(2) according to the continuous casing of motlten metal of said (1) record; It is characterized in that; Satisfy following condition (below, be also referred to as " second invention ") by the relation of total aperture area S of the index T of the width means of the thickness/said side opening of said side opening portion sidewall, the flow speed Q of said motlten metal, said side opening:
Q/S is during less than 0.05m/s: T is more than 1.0,
Q/S is that 0.05m/s is above and during less than 0.1m/s: T is more than 0.8,
Q/S is that 0.1m/s is above and during less than 0.4m/s: T is more than 0.6,
Q/S is that 0.4m/s is above and during less than 1.2m/s: T is more than 0.5,
Q/S is 1.2m/s when above: T is more than 0.4.
(3) according to the continuous casing of motlten metal of said (1) or (2) record; It is characterized in that; In the motlten metal of the mass-impregnation of said refractory body system structure in said tundish; Upper end at said refractory body system structure is provided with peristome, refractory body system bridle is inserted (below, be also referred to as " the 3rd invention ") from the top of said tundish through this peristome.
(4) according to the continuous casing of motlten metal of said (1) or (2) record, it is characterized in that, in the motlten metal of the mass-impregnation of said refractory body system structure in said tundish, peristome is not set in the upper end of said refractory body system structure.(below, be also referred to as " the 4th invention ").
In the present invention, " at the central shaft that goes out side opening portion place side opening with respect to imaginary line angulation θ 1 " is also referred to as " angle of inclination of side opening (θ 1) " in following explanation.
" inside radius of the circular cross-section of horizontal direction " be side opening the imaginary line that goes out side opening portion and side opening central shaft intersection point (intersection point of angulation θ 1) and refractory body system structure horizontal direction circular cross-section in the heart distance, R is the mean value of this inside radius on the part of side opening opening.
[invention effect]
It is the inaccessible problem of nozzle that method of the present invention can be eliminated the shortcoming that the stream that circles round with swirl vanes applies dipping spray nozzle; And make motlten metal in the dipping spray nozzle form the stream that circles round of suitable intensity; The stream of realizing circling round apply the excellence that dipping spray nozzle has effect, be the removing of molten metal flow stability and non-metallic inclusion in the casting mold, thereby the quality that can realize stable continuous casting operation and casting sheet improves.
Description of drawings
Fig. 1 is the figure that schematically shows the continuous casting apparatus of the method that is used for embodiment of the present invention, the A-A cutaway view of Fig. 1 (a) presentation graphs 1 (b), the longitudinal sectional view of Fig. 1 (b) expression continuous casting apparatus.
Fig. 2 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention, the A-A cutaway view of Fig. 2 (a) presentation graphs 2 (b), the longitudinal sectional view of Fig. 2 (b) expression continuous casting apparatus.
Fig. 3 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention, the A-A cutaway view of Fig. 3 (a) presentation graphs 3 (b), the longitudinal sectional view of Fig. 3 (b) expression continuous casting apparatus.
Fig. 4 is the figure that schematically shows as the continuous casting apparatus of comparative example of the present invention, the A-A cutaway view of Fig. 4 (a) presentation graphs 4 (b), the longitudinal sectional view of Fig. 4 (b) expression continuous casting apparatus.
Fig. 5 is the figure that schematically shows as another continuous casting apparatus of comparative example of the present invention, the A-A cutaway view of Fig. 5 (a) presentation graphs 5 (b), the longitudinal sectional view of Fig. 5 (b) expression continuous casting apparatus.
The specific embodiment
As stated; The present invention is " a kind of continuous casing of motlten metal; will be that the mode of vertical is configured in above the dipping spray nozzle in the tundish at the refractory body system structure of cylindric, coniform or circular cone shape that sidewall is provided with the hollow of the side opening more than 1 with the axle of this refractory body system structure; and from said tundish supplying melting metal in dipping spray nozzle; the continuous casing of said motlten metal is characterised in that; the imaginary line that is radial extension from the center of the circular cross-section of the horizontal direction of said refractory body system structure and the central shaft of said side opening are at the crossing and formation intersection point of the inner surface of said refractory body system structure; at this intersection point place; The central shaft of said side opening is angle θ 1 with respect to this imaginary line inclination angulation; Through the motlten metal in the said tundish is passed through towards the side opening portion that goes out in the inner surface upper shed of said refractory body system structure from the side opening portion of going at the said side opening of the outer surface upper shed of said refractory body system structure; And the motlten metal of in said dipping spray nozzle, supplying with from said tundish is applied circumferential flow velocity with the formation stream that circles round, and the mean inside diameter 2R of the circular cross-section of the said horizontal direction of the part of said side opening opening is 250mm～1200mm, the height of said side opening is that 30mm～500mm and said angle θ 1 are 15 °～80 °; Mean inner radius R, said angle θ 1 by the circular cross-section of the said horizontal direction of the part of total aperture area S of the flow speed Q of said motlten metal, said side opening, said side opening opening constitute, and the index P that is represented by following (1) formula satisfies 0.015m
2/ s≤P≤0.100m
2/ s,
P＝R×Q/S×Sinθ1...(1)”。About content of the present invention, explain in further detail below.
Fig. 1 is the figure that schematically shows the continuous casting apparatus of the method that is used for embodiment of the present invention, and this figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.
As shown in the drawing; Dispose the refractory body system structure 1 of the tubular of hollow in the tundish 5 above dipping spray nozzle 4; Imaginary line X1～X5 that this refractory body system structure 1 is radial extension in the center O from the circular cross-section of horizontal direction has the center of hole exits, and the direction that makes the central shaft Y1～Y5 in hole with respect to imaginary line X1～X5 tilts and the side opening 2 of opening is being provided with on the sidewall more than 1.The axle 3 of this refractory body system structure is a vertical.When the motlten metals 6 in the tundish 5 flow in the refractory body system structure 1 through side opening 2, be applied in circumferential velocity component and form the stream that circles round, interior and to casting mold 11 supplies from tundish 5 via dipping spray nozzle 4.
(1) first invention
As stated; First invention relates to a kind of continuous casing of motlten metal; To with the axle of refractory body system structure 1 be at the refractory body system structure 1 of cylindric, coniform or circular cone shape that sidewall is provided with the hollow of the side opening more than 1 mode of vertical be configured in dipping spray nozzle 4 in the tundish 5 above; And from tundish 5 supplying melting metal 6 in dipping spray nozzle 4; Wherein, Imaginary line X1～the XN that is radial extension in the center O from the circular cross-section of the horizontal direction of refractory body system structure 1 (wherein; N representes the bar number of imaginary line) on have a hole go out side opening portion center, make with respect to imaginary line X1～XN the hole central shaft direction tilt angle theta 1 and pass side opening 2, pass through towards the side opening portion that goes out from the side opening portion of going into through making the motlten metal 6 in the tundish 5 at the side opening 2 of the outer surface upper shed of refractory body system structure 1 in the inner surface upper shed of refractory body system structure 1; And the motlten metal of in dipping spray nozzle 4, supplying with from tundish 5 is applied circumferential flow velocity with the formation stream that circles round; The mean inside diameter 2R of the circular cross-section of the said horizontal direction of the part of side opening 2 openings is 250mm～1200mm, and the height of side opening is 30mm～500mm, and said angle θ 1 is 15 °～80 °; Mean inner radius R, said angle θ 1 by the circular cross-section of the said horizontal direction of the part of total aperture area S of the flow speed Q of motlten metal, side opening, side opening opening constitute, and the index P that is represented by above-mentioned (1) formula satisfies 0.015m
2/ s≤P≤0.100m
2/ s.
This refractory body system structure 1 has the side opening 2 of tilt angle theta 1 through setting, and can apply circumferential velocity component to motlten metal 6, and forms the stream that circles round.Can be 1 though have the side opening 2 of tilt angle theta 1, the viewpoint that the danger of the obturation that the non-metallic inclusion that from make motlten metal 6, contains causes is disperseed, preferably the complete cycle at refractory body system structure 1 has a plurality of.And, also can side opening 2 be provided with a plurality ofly at the complete cycle of refractory body system structure 1, and multistage is set along the short transverse (axle 3 directions) of refractory body system structure 1.Yet, when a plurality of side opening 2 is set,, preferably side opening 2 is arranged to equal height respectively from the viewpoint of the height of avoiding unnecessarily increasing refractory body system structure 1.
The tilt angle theta 1 that is provided with a plurality of side openings 2 both can be identical, and can in certain scope, change.Yet, preferably to motlten metal 6 apply circle round stream direction of rotation identical.In addition, can also be that the next door of side opening 2 is thin fin-shaped, and have the shape of a plurality of side openings along the circumferencial direction of refractory body system structure 1.
It is the size that the foreign matter about 30mm passes through that side opening 2 preferably can make the maximum particle diameter in the motlten metal.The upside of side opening 2 and the internal face of downside both can level also can tilt., the height and position of the lower end of side opening 2 is preferably low position, promptly is that 200mm is with interior height, in order to avoid cause when casting finishes because motlten metal 6 remains in the tundish 5 interior decrease in yield that cause apart from the tundish bottom surface.
In the upper end of refractory body system structure 1, both loam cake can be set, also loam cake can be set.When the upper end 7 of refractory body system structure 1 was provided with loam cake, from the viewpoint of the stream decay of circling round of avoiding making formation, preferably being limited in the internal height of refractory body system structure 1 apart from the upper end of side opening 2 was in the scope below the 150mm.
In addition, in the upper end of refractory body system structure 1 during opening, the motlten metal 6 of (upper outer of refractory body system structure 1) and is rotated by the circling round to flow and drive of the motlten metal 6 of the inside of the refractory body system of being formed on structure 1 in the tundish 5.In this case, this driving can consume the angular movement energy of the stream that circles round, so the stream that circles round of the motlten metal 6 of the inside of refractory body system structure 1 weakens.When the aperture area in refractory body system structure 1 upper end was big more, this consumed energy was big more.Therefore; When the upper end 7 of refractory body system structure 1 is not provided with loam cake; From avoiding making the viewpoint of the identical stream decay of circling round, the internal diameter that leans on the top that is provided with the height of side opening 2 preferably dwindles than the internal diameter of the part below the height that is provided with side opening 2, and is 50mm～200mm.And, when loam cake is not set,, preferably make the motlten metal face height in the aspect ratio tundish 5 of upper end 7 high from preventing the viewpoint of sneaking into of tundish slag in refractory body system structure 1.
In the present invention, the mean inside diameter 2R of the circular cross-section of the horizontal direction of the part of side opening 2 openings of refractory body system structure 1 is the scope of 250mm～1200mm.Its reason is; If mean inside diameter 2R is less than the words of 250mm; Become too small as the stream applying mechanism that circles round, therefore be difficult to obtain sufficient moment of momentum, and; Because the cross-sectional area of motlten metal path reduces, therefore can produce the problem of the obturation of side opening 2 or the frictional resistance increase of motlten metal 6 etc.And, if mean inside diameter 2R surpasses 1200mm, then become excessive, so the increase of the cost of refractory body system structure 1 is certainly needless to say as the stream applying mechanism that circles round, also need special-purpose tundish, can cause the cost of Casting Equipment to increase.
The cross sectional shape of the horizontal direction of refractory body system structure 1 is preferably just round, but also can obtain same effect for polygon or elliptical shape.In this case, see mean inside diameter 2R as apart from the mean value of the distance at center.Yet, when cross sectional shape is not positive bowlder, to compare with just round situation, the energy efficiency that the stream that circles round forms descends.
The height of the side opening 2 of refractory body system structure 1 is the scope of 30mm～500mm.This is because if the height of side opening 2 that is arranged at refractory body system structure 1 is less than 30mm, then the stream of motlten metal is too small, and obturation takes place easily.And if the height of side opening 2 surpasses 500mm, then the flow path area of motlten metal (sectional area of side opening 2) is excessive, the situation that the flow velocity of guaranteeing the motlten metal through side opening 2 the obtains sufficient moment of momentum difficulty that becomes.In addition, if the height of side opening 2 surpasses 500mm, then the height of refractory body system structure 1 unnecessarily becomes greatly, and is therefore not preferred.The preferred scope of the height of side opening 2 is 50～250mm.
Here; The height of side opening 2 is meant the height of side opening 2 itself when side opening 2 only is provided with 1 section along the vertical direction; Arrange along the vertical direction when multistage is set at side opening 2, the height sum that is meant the side opening 2 of multistage is (for example, when the side opening 2 of height 200mm is provided with 2 sections; It highly is 200 [mm] * 2, is 400mm).And, when the shape of cross section of side opening 2 is not rectangle, its maximum height is confirmed as the height of side opening 2.In addition, at the height that a plurality of side opening 2 is set along circumferencial direction not simultaneously, the average height of these side openings 2 is confirmed as the height of side opening 2.
The scope of the preferred 30mm～200mm of width of side opening 2.When the width of side opening 2 during less than 30mm, take place inaccessiblely easily, when surpassing 200mm, the intensity of structure 1 descends.And when the width of side opening 2 surpassed 200mm, the sectional area of side opening 2 became excessive, is difficult to make the value of (1) formula to satisfy prescribed limit.When the shape of cross section of side opening 2 was not rectangle, its Breadth Maximum was taken as the width of side opening 2.
The tilt angle theta 1 of side opening 2 is 15 °～80 ° a scope.Its reason is, when the tilt angle theta of the side opening 2 of the refractory body system of being arranged at structure 11 to 15 ° hour, and the undercapacity of the stream that circles round that applies.And when tilt angle theta 1 surpassed 80 °, the thickness attenuation of the sidewall of refractory body system structure 1 can produce the problem on the intensity.
In the method for the invention, the side opening of being obtained by the total aperture area S according to the flow speed Q of motlten metal and side opening is defined as 0.015m through the scope of the mean inner radius R of the circular cross-section of the said horizontal direction of the part of mean flow rate Q/S, side opening opening, the index P that angle θ 1 constitutes (P=R * Q/S * Sin θ 1)
2/ s～0.100m
2/ s's the reasons are as follows.
The present inventor has found the index as the moment of momentum that flows circling round of the motlten metal of refractory body system structure 1 inner formation with the long-pending P of mean inner radius R and tangential direction (direction vertical with the radius) component of the mean flow rate Q/S of motlten metal through side opening 2; And this index P guaranteed to be suitable scope, can in dipping spray nozzle, form the stream that circles round of suitable intensity thus.
In refractory body system structure 1, form circle round stream in flowing into dipping spray nozzle before, accept the throttling that the flow guiding mechanism by stopper and sliding gate etc. carries out.The decay behavior of the stream that circles round that this throttling causes is complicated, and the stream stronger (moment of momentum is big more) that circles round that in structure 1, forms, and can produce the phenomenon that receives remarkable decay more.That is, if circling round of in structure 1, forming flow through by force, the decay of the stream that circles round that then the flow guiding mechanism produces becomes significantly, the energy efficiency decline that the stream that circles round forms.
The present inventor experimentizes repeatedly and discusses and studied the decay behavior of flow guiding mechanism to the stream that circles round.Consequently, found if the value of index P is 0.015m
2/ s～0.100m
2In the scope of/s, the decay (energy loss) of the stream that circles round that then throttling of flow guiding mechanism causes is not remarkable, and the stream that circles round of generation has full intensity from stablizing the viewpoint that flows in the control casting mold in the dipping spray nozzle, thereby has accomplished the present invention.
When the value of index P surpasses higher limit 0.100m
2During/s, the throttling meeting of flow guiding mechanism produces the decay of the stream that circles round significantly, circles round because of this pressure loss and flows the energy efficiency decline that applies.And excessive circumferential flow velocity can cause the vibration of dipping spray nozzle.On the other hand, the value as index P is lower than lower limit 0.015m
2During/s, a little less than the stream that circles round that in dipping spray nozzle, forms, can't bring into play the static stabilization that flows in the sufficient casting mold.The preferred scope of index P is 0.020m
2/ s～0.085m
2/ s.
The sectional area S of the side opening 2 when here, two of side opening 2 sidewalls are not parallel and the definition of angle θ 1 are following.When the parallel sidewalls of side opening 2, because the central shaft and the parallel sidewalls of side opening 2, so angle θ 1 goes out side opening portion and imaginary line angulation and can uniquely determine at it as the central shaft of side opening 2.Likewise, the width of side opening 2 also can uniquely determine as the distance between sidewall.With respect to this, when the sidewall of side opening 2 is not parallel, because of the method difference angle θ 1 of the decision of the central shaft of side opening 2 changes, because of the change width of angle θ 1 side opening 2.In this case, the width of decision angle θ 1 and side opening 2 as following.In side opening 2, dispose with the mode of joining respectively with two sidewalls than the sidewall of side opening 2 much longer on the flow direction of motlten metal 6 (total length than this side opening 2 is longer) and parallel two straight lines of level.At the interval of these parallel lines during the wideest state, the line of the central authorities through these parallel lines is as the central shaft of side opening 2.And the central shaft of side opening is confirmed as angle θ 1 at the side opening portion place that goes out of side opening 2 with the imaginary line angulation.The width that is spaced apart side opening of these parallel lines.The aperture area of each side opening 2 is the areas at the minimum place of cross section of the side opening 2 vertical with its central shaft.
(2) second inventions
Likewise use said Fig. 1 that second invention of the present invention is described with first invention.
Second invention is the basis with the continuous casing of the motlten metal of first invention, it is characterized in that, the condition below the relation of mean flow rate Q/S in the side opening 2 of refractory body system structure 1 and index T (width of the thickness/side opening 2 of T=side opening portion sidewall) satisfies.
That is, Q/S is during less than 0.05m/s: T is more than 1.0,
Q/S is that 0.05m/s is above and during less than 0.1m/s: T is more than 0.8,
Q/S is that 0.1m/s is above and during less than 0.4m/s: T is more than 0.6,
Q/S is that 0.4m/s is above and during less than 1.2m/s: T is more than 0.5, and
Q/S is 1.2m/s when above: T is more than 0.4.
Mean flow rate Q/S in side opening 2 hour, if increase sidewall length with respect to the width of side opening, the effect that then motlten metal is applied circumferential flow velocity descended.Sidewall length is that the minimum of index T (width of the thickness/side opening 2 of T=side opening portion sidewall) is above-mentioned value with respect to the ratio of the width of side opening.The upper limit of index T and not specially provided for cause the gigantism of refractory body system structure 1, so are limited to 2.0 on the T of essence but excessive T can unnecessarily increase sidewall thickness.Here, the thickness of side opening portion sidewall is to pass the difference of external diameter and internal diameter of refractory body system structure 1 of part of side opening divided by 2 resulting values.
(3) the 3rd inventions
Fig. 2 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.In continuous casting apparatus shown in Figure 2, to marking prosign with the said substantially identical part of continuous casting apparatus shown in Figure 1.
The 3rd invention is as shown in Figure 2; The continuous casing of motlten metal with first invention or second invention is the basis; It is characterized in that; Upper end at the refractory body system structure 1 of mass-impregnation in motlten metal is provided with peristome, refractory body system bridle 14 is inserted from the top of tundish through peristome.
When the mass-impregnation of refractory body system structure 1 is in motlten metal; Produce the stream that circles round of motlten metal in the inside of refractory body system structure 1; Therefore if peristome is set in the upper end of refractory body system structure 1; Vortex till then can producing from the motlten metal face to dipping spray nozzle in 4 can suck the slag on the motlten metal faces in the tundish 5, is blended into the phenomenon in the casting mold 11 thereby slag takes place.For fear of this phenomenon, the central part that the bridle 14 of refractory body system is inserted into the circular cross-section of refractory body system structure 1 from the top of tundish is effective.
In this case, the shape that the refractory body system structure 1 of peristome is set in the upper end can be the arbitrary shape in cylindric, coniform or the circular cone shape.And from making the viewpoint of refractory body system structure 1 compactness, the inner surface height of refractory body system structure 1 is preferably highly identical with the upper end of side opening 2, or is limited to the position above the upper end apart from side opening 2 highly is 150mm as far as possible.The diameter of the peristome that is provided with at the loam cake of refractory body system structure 1 is preferably than the big 1～20mm of diameter of bridle 14.
In the present invention, bridle 14 uses preventing to be accompanied by the circle round formation and producing under the purpose of vortex of stream.Yet, when bridle 14 has elevating function, also can it be used in the motlten metal face level control in casting mold 11.In the time of also can and finishing in addition, be merely and carried out the switching of motlten metal path and use in when beginning casting.When being merely in when beginning casting and when finishing, bridle 14 carries out the switching of motlten metal path and when using, the control of motlten metal face levels can be used the sliding gate 9 that is arranged between dipping spray nozzle 4 and the top nozzle 8 in the casting mold 11 in the casting.
(4) the 4th inventions
Fig. 3 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.In continuous casting apparatus shown in Figure 3, to marking prosign with the said substantially identical part of continuous casting apparatus shown in Figure 1.
The 4th invention is as shown in Figure 3, is the basis with the continuous casing of motlten metal of first invention or second invention, it is characterized in that, in the upper end of the refractory body system structure 1 of mass-impregnation in the motlten metal peristome is not set.
When the mass-impregnation of refractory body system structure 1 is in motlten metal; Can produce the stream that circles round of motlten metal in the inside of refractory body system structure 1; Therefore if peristome is set in the upper end of refractory body system structure 1; Vortex till then can producing from the motlten metal face to dipping spray nozzle in 4 sucks the slag on the motlten metal faces in the tundish 5, is blended into the phenomenon in the casting mold 11 and slag takes place.For fear of this phenomenon, it is effective in the upper end of refractory body system structure 1 peristome not being set.
[embodiment]
Effect about the continuous casing of motlten metal of the present invention is elaborated based on embodiment.Need to prove that following explanation is to be the example of object as motlten metal with molten steel.
(the present invention's example 1)
Fig. 1 is the figure that schematically shows the continuous casting apparatus that is used for method of the present invention as stated, and this figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.Embodiment shown in this figure is the embodiment that satisfies said first invention and the second invention defined terms.
As shown in the drawing, the refractory body system structure 1 of hollow cylindrical comprises the part of side opening opening, and its internal diameter is 400mm, and external diameter is 550mm, and whole height is 1200mm, is that refractory body constitutes by aluminium oxide-silicon oxide.The mean inner radius R that is the position of side opening 2 openings is 200mm.Motlten metal face height in the tundish 5 during the routine operation of continuous casting are in apart from the upper end 7 of refractory body system structure 1 and are the bottom of 200mm.
On the sidewall of refractory body system structure 1; Shown in this figure (a); On the inner surface of refractory body system structure, with respect to imaginary line X1～X5 and central shaft Y1～Y5 is respectively tilt angle theta 1=40 °, with being that the side opening 2 of 80mm is provided with 5 along circumferencial direction highly for 180mm and width.That is, total aperture area S of side opening 2 is S=180 [mm] * 80 [mm] * 5 [individual], is 72000mm
2Molten steel flow speed Q in the routine casting is 60m
3/ hr.Therefore, the value of the index P that is represented by said (1) formula is P=R * Q/S * Sin θ 1=200 [mm] * 60 [m
3/ hr]/72000 [mm
2] * 0.643 is 0.030m
2/ s.
In addition, the value of index T (width of the thickness/side opening of T=side opening portion sidewall) is 75 [mm]/80 [mm]=0.938, is to be equivalent to the appropriate value (T:0.6 more than) of the side opening of molten steel through mean flow rate Q/S=0.231m/s.
In the present invention shown in Figure 1 example 1, molten steel 6 is because of being applied in circumferential flow velocity through side opening 2, when top nozzle 8 through the internal diameter reduction and sliding gate 9, and the rule of preserving according to moment of momentum and circumferentially flow velocity increase, the formation stream that circles round by force in dipping spray nozzle 4.In dipping spray nozzle 4, form circle round stream because of action of centrifugal force near 2 squit holes dipping spray nozzle 4 lower ends, evenly and ejection equably, thereby casting mold 11 in, form stable mobile.
And when perimembranous was blown into Ar gas in the fixed disk of the upside of two-layer equation sliding gate 9, Ar gas formed the bubble chamber film of inverted cone-shaped owing to act on the centrifugal force of molten steel 6.In this case, produce following effect: the non-metallic inclusion in the molten steel 6 that this bubble chamber film crosscut is flowed down is caught by bubble effectively, in casting mold 11, floats and is removed with bubble.Ar gas is blown into also from top nozzle 8 can obtain same effect.Regardless of the place that is blown into,, can both improve effect through not being from the part of interior perimembranous but being blown into from complete cycle.
Therefore the stabilization effect that flows in the above-mentioned casting mold is suitable for the steel that obtains cleaning owing to easily the molten steel flow velocity in the casting mold is controlled to suitable scope.And above-mentioned bubble is to the seizure of field trash and float effect and also can promote cleaning of steel.And, if form the stream that circles round, near the then mobile realization stabilisation the inwall of dipping spray nozzle 4, so the difficult obturation of adhering to the dipping spray nozzle that causes that non-metallic inclusion takes place.
Therefore refractory body system structure 1 shown in Figure 1 can prevent that the slag in the tundish 5 from invading its inside because its upper end 7 is higher than the motlten metal face in the tundish 5.Thereby, even produce vortex, can not take place the slag in the tundish 5 is rolled into the situation in the casting mold 11 in the inside of refractory body system structure 1 yet.
(the present invention's example 2)
Fig. 2 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention as stated.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.Embodiment shown in this figure is the embodiment that satisfies arbitrary condition of said first invention～the three invention regulation.
As shown in the drawing, the refractory body system structure 1 of hollow cone platform shape is at the position of side opening 2 openings, and internal diameter is 550mm and be 400mm in the upper end of side opening 2 in the bottom of side opening 2.At the position of side opening 2 openings, external diameter is 700mm and be 550mm in the upper end of side opening 2 in the bottom of side opening 2.And the inner surface height is 140mm, and overall height is 180mm.The material of refractory body system structure 1 is that aluminium oxide-magnesia is refractory body.The mean inside diameter 2R at the position of side opening 2 openings is (550 [mm]+400 [mm])/2, is 475mm, and mean inner radius R is 237.5mm.
On the sidewall of refractory body system structure 1; Shown in this figure (a); In the inner surface of refractory body system structure, with respect to imaginary line X1～X4 and central shaft Y1～Y4 becomes tilt angle theta 1=55 ° respectively, be that the side opening 2 of 100mm is provided with 4 along circumferencial direction highly for 100mm and width.That is, total aperture area S of side opening 2 is S=100 [mm] * 100 [mm] * 4 [individual], is 40000mm
2Molten steel flow speed Q in the routine casting is 50m
3/ hr.Therefore, the value of the index P that representes of said (1) formula is P=R * Q/S * Sin θ 1=237.5 [mm] * 50 [m
3/ hr]/40000 [mm
2] * 0.819 is 0.068m
2/ s.
The value of index T (width of the thickness/side opening of T=side opening portion sidewall) is 75 [mm]/100 [mm]=0.75, is the appropriate value (more than the T:0.6) that passes through mean flow rate Q/S=0.347m/s with respect to the side opening of molten steel.
In addition, have the peristome of diameter 110mm in the upper end 7 of hollow cone platform, the bridle 14 of diameter 100mm through this peristome from the top of tundish 5 be inserted into top nozzle 8 near.Motlten metal face height in the tundish 5 during routine operation becomes the height of refractory body system structure 1 thorough impregnation.
In the present invention's example 2 shown in Figure 2; With the situation of said the present invention example 1 likewise; Molten steel 6 through side opening 2 is applied in circumferential flow velocity; When top nozzle 8 that reduces through internal diameter and sliding gate 9, circumferentially flow velocity increases according to the rule of moment of momentum preservation, thereby in dipping spray nozzle 4, forms the strong stream that circles round.Be formed in the dipping spray nozzle 4 circling round stream because of action of centrifugal force near 2 squit holes the lower end of dipping spray nozzle 4, evenly and ejection equably, flow thereby form in the stable casting mold.
And; When the interior perimembranous from top nozzle 8 is blown into Ar gas; This Ar gas forms the bubble chamber film of inverted cone-shaped owing to act on the centrifugal force of molten steel 6; Therefore produce following effect: the non-metallic inclusion in the molten steel 6 that this bubble chamber film crosscut is flowed down is caught by bubble effectively, in casting mold 11, floats and is removed with bubble.Ar gas is blown into also from sliding gate 9 can obtain same effect.Regardless of the place that is blown into,, can both improve this effect through not being from the part of interior perimembranous but being blown into from complete cycle.
Therefore the stabilization effect that flows in the above-mentioned casting mold is suitable for the steel that obtains cleaning owing to easily the molten steel flow velocity in the casting mold is controlled to suitable scope.And above-mentioned bubble is to the seizure of field trash and float effect and also can promote cleaning of steel.And, if form the stream that circles round, near the then mobile realization stabilisation the inwall of dipping spray nozzle 4, so the difficult obturation of adhering to the dipping spray nozzle that causes that non-metallic inclusion takes place.
In the present invention's example 2, because the existence of bridle 14, therefore preventing circles round flows the generation of the vortex that causes, the possibility that the slags in the tundish 5 are brought in the casting mold 11 is very low.In addition, in routine casting, the aperture of sliding gate 9 is a standard-sized sheet and flowing path section is positive toroidal, thereby can control the molten steel flow that in casting mold, flows out through the height of bridle 14.In this case, in dipping spray nozzle 4, can form the stream that circles round of circumferential equalization.The stream that circles round of this circumferential equalization is compared with the present invention's example 1, can bring the molten steel in the more impartial and stable casting mold to flow.
(the present invention's example 3)
Fig. 3 is the figure that schematically shows another continuous casting apparatus of the method that is used for embodiment of the present invention as stated.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.Embodiment shown in this figure is the embodiment that satisfies arbitrary condition of said first invention, second invention and the 4th invention regulation.
As shown in the drawing, the refractory body system structure 1 of hollow cone platform shape is at the position of side opening 2 openings, and internal diameter is 550mm and be 400mm in the upper end of side opening 2 in the bottom of side opening 2.At the position of side opening 2 openings, external diameter is 700mm and be 550mm in the upper end of side opening 2 in the bottom of side opening 2.And the inner surface height is 140mm, and overall height is 180mm.The material of refractory body system structure 1 is that aluminium oxide-magnesia is refractory body.The mean inside diameter 2R at the position of side opening 2 openings is (550 [mm]+400 [mm])/2, is 475mm, and mean inner radius R is 237.5mm.
On the sidewall of refractory body system structure 1; Shown in this figure (a); In the inner surface of refractory body system structure, with respect to imaginary line X1～X4 and central shaft Y1～Y4 becomes tilt angle theta 1=55 ° respectively, be that the side opening 2 of 100mm is provided with 4 along circumferencial direction highly for 100mm and width.That is, total aperture area S of side opening 2 is S=100 [mm] * 100 [mm] * 4 [individual], is 40000mm
2Molten steel flow speed Q in the routine casting is 60m
3/ hr.Therefore, the value of the index P that representes of said (1) formula is P=R * Q/S * Sin θ 1=237.5 [mm] * 60 [m
3/ hr]/40000 [mm
2] * 0.819 is 0.081m
2/ s.
The value of index T (width of the thickness/side opening of T=side opening portion sidewall) is 75 [mm]/100 [mm]=0.75, is the appropriate value (more than the T:0.5) that passes through mean flow rate Q/S=0.417m/s with respect to the side opening of molten steel.
In addition, there is not peristome in the upper end 7 of hollow cone platform.Motlten metal face height in the tundish 5 during routine operation becomes the height of refractory body system structure 1 thorough impregnation.
In the present invention's example 3 shown in Figure 3; With the situation of said the present invention example 1 likewise; Molten steel 6 through side opening 2 is applied in circumferential flow velocity; When top nozzle 8 that reduces through internal diameter and sliding gate 9, circumferentially flow velocity increases according to the rule of moment of momentum preservation, thereby in dipping spray nozzle 4, forms the strong stream that circles round.Be formed in the dipping spray nozzle 4 circling round stream because of action of centrifugal force near 2 squit holes the lower end of dipping spray nozzle 4, evenly and ejection equably, flow thereby form in the stable casting mold.
And; When the interior perimembranous from top nozzle 8 is blown into Ar gas; This Ar gas forms the bubble chamber film of inverted cone-shaped owing to act on the centrifugal force of molten steel 6; Therefore produce following effect: the non-metallic inclusion in the molten steel 6 that this bubble chamber film crosscut is flowed down is caught by bubble effectively, in casting mold 11, floats and is removed with bubble.Ar gas is blown into also from sliding gate 9 can obtain same effect.Regardless of the place that is blown into,, can both improve this effect through not being from the part of interior perimembranous but being blown into from complete cycle.
Therefore the stabilization effect that flows in the above-mentioned casting mold is suitable for the steel that obtains cleaning owing to easily the molten steel flow velocity in the casting mold is controlled to suitable scope.And above-mentioned bubble is to the seizure of field trash and float effect and also can promote cleaning of steel.And, if form the stream that circles round, near the then mobile realization stabilisation the inwall of dipping spray nozzle 4, so the difficult obturation of adhering to the dipping spray nozzle that causes that non-metallic inclusion takes place.
In the present invention's example 3, owing to do not have peristome, therefore can prevent to circle round and flow the generation of the vortex that causes in the upper end 7 of hollow cone platform, the possibility that the slags in the tundish 5 are brought in the casting mold 11 is very low.The present invention's example 3 is compared with the present invention's example 1, because refractory body system structure 1 is little, so cost is low.And, compare with the present invention's example 2, owing to do not use bridle 14, therefore aspect low-cost, also have advantage.
The continuous casing of the motlten metal of the present invention shown in above-mentioned the present invention's example 1～the present invention example 3 is compared with the common continuous casing of the refractory body system of setting structure 1; Owing to can in dipping spray nozzle 4, form the stream that circles round; Therefore can realize near the stabilisation that flows of inwall of dipping spray nozzle 4, and suppress non-metallic inclusion adhering to inwall.Therefore, method of the present invention passes through to realize stabilisation mobile in the casting mold, and can bring into play big effect for high-qualityization of casting sheet and the productivity raising of continuous casting.
(comparative example 1)
Fig. 4 is the figure that schematically shows as the continuous casting apparatus of comparative example of the present invention.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.In the continuous casting apparatus shown in this figure, to marking prosign with the said substantially identical part of continuous casting apparatus shown in Figure 2.Embodiment shown in this figure is the embodiment that does not satisfy the said first invention defined terms.
As shown in the drawing, the refractory body system structure 1 of hollow cone platform shape is at the position of side opening 2 openings, and internal diameter is 600mm and be 400mm in the upper end of side opening 2 in the bottom of side opening 2.At the position of side opening 2 openings, external diameter is 700mm and be 500mm in the upper end of side opening 2 in the bottom of side opening 2.And the inner surface height is 350mm, and overall height is 400mm, is that refractory body constitutes by aluminium oxide-magnesia.The mean inside diameter 2R at the position of side opening 2 openings is (600 [mm]+400 [mm])/2, is 500mm, and mean inner radius R is 250mm.
On the sidewall of refractory body system structure 1; Shown in this figure (a); In the inner surface of refractory body system structure, with respect to imaginary line X1～X8 and central shaft Y1～Y8 becomes tilt angle theta 1=55 ° respectively, be that the side opening 2 of 100mm is provided with 8 along circumferencial direction highly for 250mm and width.That is, total aperture area S of side opening 2 is S=250 [mm] * 100 [mm] * 8 [individual], is 200000mm
2Molten steel flow speed Q in the routine casting is 32m
3/ hr.Therefore, the value of the index P that representes of said (1) formula is P=R * Q/S * Sin θ 1=250 [mm] * 32 [m
3/ hr]/200000 [mm
2] * 0.819 is 0.009m
2/ s is the little value of scope than the present invention's regulation.
The value of index T (width of the thickness/side opening of T=side opening portion sidewall) is 50 [mm]/100 [mm]=0.5, be than with respect to the side opening of the molten steel appropriate value (more than the T:1.0) through mean flow rate Q/S=0.044m/s little the value of Duoing.
In addition, have the peristome of diameter 110mm in the upper end 7 of hollow cone platform, the bridle 14 of diameter 100mm through this peristome from the top of tundish 5 be inserted into top nozzle 8 near.Motlten metal face height in the tundish 5 during routine operation becomes the height of refractory body system structure 1 thorough impregnation.
In comparative example shown in Figure 41, the molten steel 6 through side opening 2 is applied in circumferential flow velocity, when top nozzle 8 through the internal diameter reduction and sliding gate 9, the rule of preserving according to moment of momentum and circumferentially flow velocity increase, thereby dipping spray nozzle 4 in the formation stream that circles round.Yet, as stated, because the value of index P or the value of index T depart from prescribed limit of the present invention, and less, therefore can't form the stream that circles round of full intensity.
(comparative example 2)
Fig. 5 is the figure that schematically shows as another continuous casting apparatus of comparative example of the present invention.This figure (a) expression should be schemed the A-A cutaway view of (b), the longitudinal sectional view of this figure (b) expression continuous casting apparatus.In the continuous casting apparatus shown in this figure, to marking prosign with the said substantially identical part of continuous casting apparatus shown in Figure 1.Embodiment shown in this figure is the embodiment that does not satisfy said first invention～the three invention defined terms.
The refractory body system structure 1 of hollow cone platform shape comprises the part of side opening opening, and internal diameter is 400mm, and external diameter is 550mm, and whole height is 1250mm, is that refractory body constitutes by aluminium oxide-silicon oxide.The mean inner radius R that is the position of side opening 2 openings is 200mm.Motlten metal face height in the tundish 5 during the routine operation of continuous casting are in apart from the upper end 7 of refractory body system structure 1 and are the bottom of 100mm.
On the sidewall of refractory body system structure 1; Shown in this figure (a); In the inner surface of refractory body system structure, with respect to imaginary line X1～X3 and central shaft Y1～Y3 becomes tilt angle theta 1=40 ° respectively, be that the side opening 2 of 80mm is provided with 3 along circumferencial direction highly for 80mm and width.That is, total aperture area S of side opening 2 is S=80 [mm] * 80 [mm] * 3 [individual], is 19200mm
2Molten steel flow speed Q in the routine casting is 65m
3/ hr.Therefore, the value of the index P that representes of said (1) formula is P=R * Q/S * Sin θ 1=200 [mm] * 65 [m
3/ hr]/19200 [mm
2] * 0.643 is 0.121m
2/ s is the big value of scope than the present invention's regulation.
The value of index T (width of the thickness/side opening of T=side opening portion sidewall) is 75 [mm]/80 [mm]=0.938, is than the much bigger value of appropriate value (more than the T:0.5) of passing through mean flow rate Q/S=0.940m/s with respect to the side opening of molten steel.
In comparative example shown in Figure 52, the molten steel 6 through side opening 2 is applied in circumferential flow velocity, when top nozzle 8 through the internal diameter reduction and sliding gate 9, the rule of preserving according to moment of momentum and circumferentially flow velocity increase, thereby dipping spray nozzle 4 in the formation stream that circles round.Yet, as stated,, therefore circle round and flow through the decline that causes energy efficiency by force because the value of index P is excessive.And, can produce the problem of dipping spray nozzle 4 vibrations.
[industrial applicibility]
Method of the present invention can not cause that having the shortcoming that the stream that circles round that reverses tabular swirl vanes applies dipping spray nozzle in inside is that nozzle is inaccessible; And make the motlten metal in the dipping spray nozzle form the stream that circles round; The stream that can performance circles round apply the excellence of motlten metal in that dipping spray nozzle has, the casting mold flow stability and non-metallic inclusion effect such as remove, thereby the quality that can realize stable continuous casting operation and casting sheet improves.Therefore, the continuous casing of motlten metal of the present invention is to turn to the technology that can extensively be suitable in the casting field of target through low cost equipment and easy method with the stabilisation of continuous casting and the high cleanliness of metal casting sheet.
[symbol description]
1: refractory body system structure 2: side opening 3: the axle of refractory body system structure
4: dipping spray nozzle
5: tundish 51: tundish refractory body 52: the tundish iron sheet
6: motlten metal (molten steel) 7: the upper end 8 of refractory body system structure: top nozzle
9: sliding gate 10: inert gas 11: casting mold
12: solidify housing
13: casting powder 14: bridle
O: the center X1～X8 of the circular cross-section of horizontal direction: the imaginary line that is radial extension
Y1～Y8: the central shaft of side opening, θ 1: the angle of inclination of side opening.
Claims (4)
1. the continuous casing of a motlten metal; To be that the mode of vertical is configured in above the dipping spray nozzle in the tundish at the refractory body system structure of cylindric, coniform or circular cone shape that sidewall is provided with the hollow of more than one side opening with the axle of this refractory body system structure; And from said tundish supplying melting metal in dipping spray nozzle; The continuous casing of said motlten metal is characterised in that
The central shaft that is imaginary line and the said side opening of radial extension from the center of the circular cross-section of the horizontal direction of said refractory body system structure intersects and forms intersection point at the inner surface of said refractory body system structure; At this intersection point place; The central shaft of said side opening is angle θ 1 with respect to this imaginary line inclination angulation
Through the motlten metal in the said tundish is passed through towards the side opening portion that goes out in the inner surface upper shed of said refractory body system structure from the side opening portion of going at the said side opening of the outer surface upper shed of said refractory body system structure; Thereby the motlten metal of in said dipping spray nozzle, supplying with from said tundish is applied circumferential flow velocity with the formation stream that circles round
The mean inside diameter 2R of the circular cross-section of the said horizontal direction of the part of said side opening opening is 250mm～1200mm, and the height of said side opening is that 30mm～500mm and said angle θ 1 are 15 °～80 °,
Mean inner radius R, said angle θ 1 by the circular cross-section of the said horizontal direction of the part of total aperture area S of the flow speed Q of said motlten metal, said side opening, said side opening opening constitute, and the index P that is represented by following (1) formula satisfies 0.015m
2/ s≤P≤0.100m
2/ s,
P＝R×Q/S×Sinθ1……(1)。
2. the continuous casing of motlten metal according to claim 1 is characterized in that,
Relation by total aperture area S of the index T of the width means of the thickness/said side opening of said side opening portion sidewall, the flow speed Q of said motlten metal, said side opening satisfies following condition:
Q/S is during less than 0.05m/s: T is more than 1.0;
Q/S is that 0.05m/s is above and during less than 0.1m/s: T is more than 0.8;
Q/S is that 0.1m/s is above and during less than 0.4m/s: T is more than 0.6;
Q/S is that 0.4m/s is above and during less than 1.2m/s: T is more than 0.5;
Q/S is 1.2m/s when above: T is more than 0.4.
3. the continuous casing of motlten metal according to claim 1 and 2 is characterized in that,
In the motlten metal of the mass-impregnation of said refractory body system structure in said tundish,
Upper end at said refractory body system structure is provided with peristome, refractory body system bridle is inserted from the top of said tundish through this peristome.
4. the continuous casing of motlten metal according to claim 1 and 2 is characterized in that,
In the motlten metal of the mass-impregnation of said refractory body system structure in said tundish,
Upper end at said refractory body system structure is not provided with peristome.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-255222 | 2009-11-06 | ||
| JP2009255222 | 2009-11-06 | ||
| PCT/JP2010/005916 WO2011055484A1 (en) | 2009-11-06 | 2010-10-01 | Continuous casting method for molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102781605A true CN102781605A (en) | 2012-11-14 |
| CN102781605B CN102781605B (en) | 2014-11-05 |
Family
ID=43969728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080050324.6A Active CN102781605B (en) | 2009-11-06 | 2010-10-01 | Continuous casting method for molten metal |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2497585B1 (en) |
| JP (1) | JP5440610B2 (en) |
| KR (1) | KR101384019B1 (en) |
| CN (1) | CN102781605B (en) |
| ES (1) | ES2658172T3 (en) |
| PL (1) | PL2497585T3 (en) |
| WO (1) | WO2011055484A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965003A (en) * | 2016-07-05 | 2016-09-28 | 东北大学 | Nozzle flow rotating generation device and nozzle flow rotating continuous casting method |
| CN108247033A (en) * | 2018-01-17 | 2018-07-06 | 武汉科技大学 | A kind of continuous casting production eddy flow filling pipe end |
| CN109108240A (en) * | 2018-10-31 | 2019-01-01 | 武汉科技大学 | A kind of continuous casting production air swirl filling pipe end brick cup |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5768751B2 (en) * | 2012-03-29 | 2015-08-26 | 新日鐵住金株式会社 | Method for continuous casting of molten metal |
| JP6354341B2 (en) * | 2014-05-30 | 2018-07-11 | 新日鐵住金株式会社 | Method for imparting swirl flow to molten metal |
| JP6331810B2 (en) * | 2014-07-18 | 2018-05-30 | 新日鐵住金株式会社 | Metal continuous casting method |
| PL3317034T3 (en) | 2015-07-02 | 2020-09-07 | Vesuvius U S A Corporation | Tundish outlet modifier |
| KR102184274B1 (en) * | 2019-03-04 | 2020-11-30 | 경북대학교 산학협력단 | Apparatus for preventing entrainment of floating matters on free surfaces of ladle and tundish during continuous casting process |
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- 2010-10-01 EP EP10828046.2A patent/EP2497585B1/en not_active Not-in-force
- 2010-10-01 WO PCT/JP2010/005916 patent/WO2011055484A1/en active Application Filing
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| CN105965003B (en) * | 2016-07-05 | 2018-05-29 | 东北大学 | A kind of mouth of a river whirlwind generator and mouth of a river eddy flow continuous cast method |
| CN108247033A (en) * | 2018-01-17 | 2018-07-06 | 武汉科技大学 | A kind of continuous casting production eddy flow filling pipe end |
| CN108247033B (en) * | 2018-01-17 | 2020-07-21 | 武汉科技大学 | Rotational flow water feeding port for continuous casting tundish |
| CN109108240A (en) * | 2018-10-31 | 2019-01-01 | 武汉科技大学 | A kind of continuous casting production air swirl filling pipe end brick cup |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2497585A4 (en) | 2016-12-21 |
| EP2497585A1 (en) | 2012-09-12 |
| CN102781605B (en) | 2014-11-05 |
| KR20120079476A (en) | 2012-07-12 |
| EP2497585B1 (en) | 2017-11-29 |
| JPWO2011055484A1 (en) | 2013-03-21 |
| PL2497585T3 (en) | 2018-04-30 |
| WO2011055484A1 (en) | 2011-05-12 |
| KR101384019B1 (en) | 2014-04-09 |
| JP5440610B2 (en) | 2014-03-12 |
| ES2658172T3 (en) | 2018-03-08 |
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