JPH10211553A - Metal strip casting method, device therefor and refractory nozzle for supplying molten metal to casting pool of twin roll strip casting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize disturbance of a pool surface by supplying a molten metal to a nozzle trough downward and causing the molten metal to flow from a side part outlet to a casting pool through a side part chamber thereby forming a smooth and uniform flow along a casting surface. SOLUTION: In casting work, a casting pool 68 is held at a height where a metal supply nozzle 19 lower end is immersed in a casting pool 68 by controlling a metal flow, a side part outlet 64 is arranged just under the surface of the casting pool 68. The molten metal is caused to flow out through the side part outlet 64 as a continuous curtain flow directing two side outward near the casting pool 68 whole surface so that the molten metal collides on a casting roll 16 cooling surface right near the casting pool 68 surface over a roll whole surface. By this method, a temp. of the molten metal 65 supplied to a meniscus region of the coasting pool 68 is made to max, a crack and a meniscus mark on a strip surface are greatly reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for casting metal strip, and a refractory nozzle for supplying molten metal to a casting pool of a twin roll strip casting apparatus.

[0002]

BACKGROUND OF THE INVENTION It is known to cast metal strip by continuous casting in a twin roll casting machine. The molten metal is introduced between a pair of horizontal casting rolls that are cooled and rotate in opposite directions, the metal shells are solidified on the moving roll surface, and the metal shells are united at the roll gap to form a solidified strip product. It is fed downward from the roll gap. As used herein, the term "roll gap" is intended to refer to the entire area where the rolls are closest. The molten metal is poured from the ladle into one or a series of small containers, from which it flows to a metal feed nozzle located above the roll gap and into the roll gap, and consequently roll casting just above the roll gap A casting pool of molten metal supported on the surface can be formed. The end of the casting pool may be a side dam or side plate held in sliding engagement with the roll end surface.

[0003]

While twin roll casting has met with some success for non-ferrous metals which solidify rapidly upon cooling, the high solidification temperatures and uneven uniformity on the cooled roll casting surface. There are various problems in applying the technology to the casting of iron-based metals, which are susceptible to defects due to solidification.
Accordingly, much attention has been paid to the design of the metal feed nozzle to flow the metal into and out of the casting sump smoothly and uniformly. The devices disclosed in U.S. Pat. Nos. 5,178,205 and 5,238,050 both have a metal feed nozzle extending below the surface of the casting pool and a metal feed nozzle immersed in the casting pool at the bottom end. It incorporates means to reduce the kinetic energy of the molten metal flowing down to the slot outlet.
In the device disclosed in US Pat. No. 5,178,205, it is the flow diffuser that reduces the kinetic energy. The flow diffuser has a plurality of flow paths and a baffle located above the diffuser, below which the molten metal flows slowly and uniformly through the elongate exit hole into the casting reservoir to minimize turbulence. In the apparatus disclosed in U.S. Pat. No. 5,238,050, the molten metal flow is allowed to fall and collide with the nozzle inclined side wall surface at an acute collision angle, so that the metal adheres to the side wall surface and exits. Form a flow sheet towards the channel. Again, the goal is to allow the metal flow to flow slowly and uniformly from the bottom of the metal supply nozzle to minimize turbulence in the casting pool.

[0004] Tokuho 5-7053 of Nippon Steel Corporation
No. 7 also discloses a metal supply nozzle adapted to allow a gentle and uniform metal flow to flow down into a casting pool. The metal supply nozzle is provided with a perforated baffle / diffuser to remove kinetic energy from the flowing molten metal, and the kinetic energy-depleted metal stream flows through a series of openings in the nozzle sidewall into the casting pool. The openings are angled such that the metal stream flows along the roll casting surface in the longitudinal direction of the roll gap. That is, the opening on one side of the metal supply nozzle allows the metal flow to flow in one direction in the longitudinal direction of the roll gap, and the opening on the other side allows the metal flow to flow in the other direction in the longitudinal direction of the roll gap, so that the metal flows smoothly along the casting surface. The aim is to minimize the disturbance of the casting pool surface by creating a uniform flow in the casting.

As a result of extensive studies and studies conducted by the present inventor, a major cause of the defect is that the molten metal prematurely solidifies in the so-called "meniscus" or "meniscus area" where the casting pool surface meets the roll casting surface. I realized that. The molten metal in each of these zones flows toward the adjacent casting surface, and if solidification of the molten metal occurs before even contact with the roll surface, an irregular initial heat transfer between the metal shell and the roll occurs. This is likely to occur, and as a result, surface defects such as pits, ripple marks, hot water boundaries, and cracks will be formed.

[0006] Prior attempts to make the molten metal flow into the casting pool very uniformly have been made in an area where the metal first solidifies due to shell surface formation, ie, the area that eventually becomes the outer surface of the formed strip. The premature solidification is inevitably intensified to some extent due to the inflow of the metal stream out of the way, so the molten metal temperature in the casting pool surface area between the rolls is much higher than the temperature of the incoming molten metal. Low. If the temperature of the casting pool molten metal in the meniscus area is too low, cracks and "meniscus marks" (marks on the strip caused by the meniscus that solidify with non-uniform casting pool levels) are very likely to occur. Conventionally, one way to address this problem is to apply a high level of superheating to the incoming molten metal so that the molten metal can cool down in the casting pool without reaching the solidification temperature before reaching the roll surface. There was a way to do it. However, in recent years, molten metal prematurely solidifies prior to contact with the casting roll surface by taking the measure of inserting the metal supply nozzle directly into the meniscus area of the casting pool to ensure relatively rapid inflow of the molten metal. It has been recognized that minimizing this tendency can effectively address the problem of premature coagulation.
This method is much more effective at avoiding surface defects than providing an absolutely steady metal flow to the casting pool, and the casting pool does not solidify until the metal contacts the roll surface. It has been found that some surface variations are acceptable. Examples of such an approach can be found in Japanese Patent Application Laid-Open No. 1-5650 of Nippon Steel Corporation and Australian Patent Application No. 60773/96 of the present applicant.

In order to ensure that the incoming molten metal is supplied to the meniscus area relatively quickly, a supply nozzle having side openings is used, and the molten metal is fed laterally outward from the bottom of the supply nozzle to a casting roll. It is necessary to supply
Therefore, it is necessary for the supply nozzle to capture the downward falling flow of the molten metal and minimize the turbulence and the flow fluctuation so that the molten metal can flow out from the side opening stably. It is therefore necessary to absorb the downward kinetic energy of the incoming metal flow and to establish an essentially turbulent state at the side openings. Moreover, these must be achieved without significantly restricting the metal flow in a very limited space in the bottom of the feed nozzle. Prior art baffle / diffuser configurations are not well suited to achieve this goal, but the present invention accomplishes this with a simple method and apparatus.

[0008]

According to the present invention, molten metal is introduced between casting rolls through an elongated metal supply nozzle disposed above and along the roll gap between a pair of cooled casting rolls. Forming a molten metal casting pool supported above the roll gap, and rotating the casting roll to cast a solidified strip fed down from the roll gap. Consisting of an upwardly open nozzle trough that extends in the longitudinal direction and receives the molten metal, allowing the molten metal to flow from the metal supply nozzle to the casting pool through a side outlet,
The side outlets extend along each side of the floor of the nozzle trough and communicate with a pair of nozzle side chambers projecting upwardly from the floor, and the molten metal is fed down into the nozzle trough to remove the side chamber from the nozzle trough. Through the side outlet to the casting pool.

[0009] Preferably, the side outlet is an elongated hole extending continuously over substantially the entire length of the metal supply nozzle to create an outward curtain flow of molten metal into the casting pool.

[0010] Preferably, the molten metal is fed down into the nozzle trough and impinges on the floor between the side chambers of the nozzle trough. The molten metal may be delivered in a series of discrete free-fall streams spaced apart in the longitudinal direction of the nozzle trough, or in a continuous free-fall curtain stream extending along the nozzle trough.

The present invention also provides a pair of parallel casting rolls forming a roll gap therebetween, an elongated metal supply nozzle extending above the roll gap along the roll gap and supplying molten metal to the roll gap. And a distributor arranged above the metal supply nozzle to supply the molten metal to the metal supply nozzle.In the metal strip casting apparatus, the metal supply nozzle extends in the longitudinal direction of the roll gap to remove the molten metal from the distributor. An incoming, upwardly open elongated nozzle trough, a pair of elongated side chambers each extending upwardly from the floor of the nozzle trough along each side of the floor of the nozzle trough, and a metal stream flowing molten metal from inside the nozzle trough to the side chamber. A metal strip comprising an opening and a side outlet for flowing molten metal from the bottom of the metal supply nozzle outward from the side chamber. To provide a casting apparatus.

Preferably, the side outlet is an elongated hole extending continuously over substantially the entire length of the metal supply nozzle.

Preferably, the side chamber is formed so as to extend along the bottom corner by partitioning the bottom corner of the metal supply nozzle from the inside of the nozzle trough by a partition wall disposed in the metal supply nozzle. .

Still preferably, the metal flow passage is formed by an opening in the partition wall.

Still preferably, the partition wall is formed from a pair of laterally spaced upright walls rising from the floor of the nozzle trough and constituting the inner side wall of the side chamber, and laterally outward from the upper end of the upright wall. And an extended chamber top wall.

In this case, the metal flow passage may be constituted by a series of longitudinally-spaced openings in each of the upright walls constituting the inner wall of the side chamber.

Alternatively, or in addition, the metal flow passage may be comprised of a series of longitudinally spaced openings in the chamber top wall.

The distributor is operable to deliver molten metal downward between the side chambers of the nozzle trough so as to impinge on the floor between the side chambers and flow outwardly with respect to the chamber side walls. Can be.

The present invention also provides an upwardly opening elongated nozzle trough for receiving molten metal from a distributor, and a pair of elongated side chambers each extending upwardly from the nozzle trough floor along each side of the nozzle trough floor. A twin roll, comprising: a metal flow opening for flowing molten metal from the inside of the nozzle trough to the side chamber; and a side outlet for flowing molten metal from the bottom of the metal supply nozzle outward from the side chamber. A refractory nozzle for supplying molten metal to a casting pool of a strip casting apparatus.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS In order to more fully describe the present invention, certain methods and apparatus will be described in more detail with reference to the accompanying drawings.

FIG. 1 to FIG. 12 show an embodiment of the present invention. The illustrated casting apparatus has a main machine frame 11 rising from a factory floor 12. A casting roll cart 13 supported by the main machine frame 11 is horizontally movable between an assembly station 14 and a casting station 15. A pair of parallel casting rolls 16 carried by the casting roll carriage 13 are supplied from the ladle 17 to the distributor 1 during casting.
Molten metal is supplied through 8 and a metal supply nozzle 19. Since the casting roll 16 is water-cooled, a metal shell is formed on the surface of the moving roll and is joined at the roll gap to produce a solidified metal strip 20 at the roll exit.
This metal strip 20 may be sent to a main coiler 21 and then to a second coiler 22. Since the container 23 is mounted on the main machine frame 11 adjacent to the casting station 15, molten metal can escape to the container 23 via the overflow port 24 of the distributor 18.

The bogie frame 31 constituting the casting roll bogie 13 is mounted on the rails 33 by the wheels 32, and the rails 33 extend along a part of the main machine frame 11, so that the entire casting roll bogie 13 moves to the rails 33. It will be listed as possible. The casting roll 16 is rotatably mounted on a pair of roll cradle 34 carried by the carriage frame 31. A double-acting hydraulic piston cylinder device 39 capable of moving the entire casting roll truck 13 along the rail 33 is provided with a drive bracket 40 of the casting roll truck 13.
And the main machine frame 11 so that the casting roll carriage 13 can be moved from the assembly station 14 to the casting station 15 and vice versa.

The casting roll 16 is rotated in opposite directions via a roll drive shaft 41 of an electric motor and a transmission on the bogie frame 31. A series of water cooling passages formed in the copper peripheral wall of the casting roll 16 and extending in the longitudinal direction and separated in the circumferential direction are connected with a roll end from a water cooling conduit in a roll drive shaft 41 connected to a water cooling hose 42 via a rotating gland 43. Cooling water is supplied via the A typical size of the casting roll 16 is about 500 mm in diameter and can be up to 2 m in length to produce strips up to 2 m wide.

The ladle 17 is entirely conventional and is supported from the overhead crane via the yoke 45 and can be moved from the hot metal receiving station to a fixed position.
By moving a stopper rod 46 attached to the ladle 17 with a servo cylinder, the molten metal is removed from the ladle 17.
Through the outlet nozzle 47 and the refractory shroud 48 to the distributor 18.

The distributor 18 is a wide dish made of a refractory material such as a high-alumina castable with an anticorrosion lining. One side of the distributor 18 receives the molten metal from the ladle 17 and is provided with the overflow port 24 described above. On the other side of the distributor 18 are a series of vertically spaced outlet openings 52.
Is provided. A mounting bracket 53 for supporting the lower portion of the distributor 18 is for mounting the distributor 18 to the bogie frame 31. The mounting bracket 53 receives the positioning pegs 54 of the bogie frame 31 through an opening provided in the mounting bracket 53, and the distributor 18 is moved. It is designed to position accurately.

The metal supply nozzle 19 is formed of two identical halves made of a refractory material such as alumina graphite and is held end-to-end to form a complete nozzle. FIGS. 5 to 12 show the configuration of the metal supply nozzle 19 half that is supported on the bogie frame 31 by the mounting bracket 60. FIG. At the upper part of the metal supply nozzle 19 half, a side flange 55 protruding outward is formed so that the mounting bracket 6 can be mounted.
It is located on 0.

Each metal supply nozzle 19 half is generally trough-shaped, the metal supply nozzle 19 forming an upwardly open nozzle trough 61 for receiving a molten metal stream 65 flowing down from the outlet opening 52 of the distributor 18. The nozzle trough 61 is formed between a longitudinal side wall 62 and an end wall 70 and can be considered to be laterally partitioned between two ends by two flat end walls 80 of the metal supply nozzle 19 half. The walls 80 together form a complete nozzle. The horizontal floor 63 closing the bottom of the nozzle trough 61 is fitted with the side wall 62 at the chamfered bottom corner 81. The bottom corner 81 of the metal supply nozzle 19 is provided with an elongated slotted side outlet 64 extending substantially the entire length of the nozzle. The side outlet 64 is connected to the metal supply nozzle 1.
Nine from the bottom outwardly, the molten metal stream 65 is arranged to exit as two continuous curtain streams extending approximately the entire length of the nozzle.

According to the present invention, a pair of elongated side chambers 82 define a partition wall 83,
84, the bottom corner of the metal supply nozzle 19 is partitioned from the inside of the trough. The side chambers 82 extend at the bottom corners of the metal supply nozzles 19, and the insides thereof are constituted by partition walls 83 which stand upright from the floor 63 of the nozzle trough 61, and their tops are formed from the upper ends of the partition walls 83. The partition wall 84 extends outward.

The side outlet 64 communicates with the side chamber 82 and does not directly communicate with the inside of the nozzle trough 61. The side chamber 82 receives the molten metal stream 65 from the inside of the trough via a series of longitudinally spaced openings 86 in the metal stream provided in each of the partition walls 83 defining the chamber inner wall. The inner trough groove 85 is formed by the partition wall 83 and the floor 63.
And receives an incoming molten metal stream as described below.

A half of the metal supply nozzle 19 extends outwardly beyond the end wall 70 and separates the molten metal stream 65 into the "triple junction" area of the casting pool 68, ie, the two casting rolls 16,1.
A triple point pouring end formation 87 is provided which faces the area of the casting pool 68 where the 6 and the side weir 56 meet. The purpose of directing the molten metal to the triple point zones is to prevent the formation of "skulls" in these zones due to premature solidification of the molten metal, as described in our Australian patent application no. No. 97 is described in further detail.

Each triple point pouring tip 87 has a small upwardly open reservoir 8 for receiving molten metal from distributor 18.
8 and this reservoir 88 is separated from the nozzle trough 61 by an end wall 70. Upper end 89 of end wall 70
Is lower than the upper end of the nozzle trough 61 and the upper end of the reservoir 88, and can function as a weir that allows a backflow to the nozzle trough 61 when the reservoir 88 overflows, as described in detail below.

The reservoir 88 is formed as a shallow dish having a flat floor portion 91, an inclined inner surface 92 and side surfaces 93, and a curved upright outer surface 94. A pair of triple point injection passages 95 extend right above the floor 91 from the lateral outside of the reservoir 88 and connect to a triple point injection outlet 96 below the triple point injection end forming portion 87. The triple junction spout 96 inclines downward and inward to supply molten metal to the triple junction area of the casting pool 68.

The molten metal falls from the outlet opening 52 of the distributor 18 to the bottom of the nozzle trough 61 as a series of free-falling vertical streams (molten metal stream 65). Molten metal flows out of this nozzle trough 61 via a side outlet 64 and is
A casting pool 68 supported above the roll gap 69 between the six is formed. Surrounding the casting pool 68 by the ends of the casting roll 16 are a pair of side dams 56 which are
Is held in contact with the end 57. The side dam plate 56 is made of a strong refractory material such as boron nitride and is attached to the plate holder 73. The plate holder 73 is movable by the operation of the pair of hydraulic cylinder devices 72, and the side weir plate 56 is
The six ends are engaged to form an end closure for the casting pool 68 of molten metal.

In the casting operation, by controlling the metal flow, the casting pool 68 is held at a height at which the lower end of the metal supply nozzle 19 is immersed in the casting pool 68, and the side outlet 64 of the metal supply nozzle 19 is set in the casting pool 68. Placed just below the surface of the
The molten metal is connected in two laterally outwardly proximate portions of the casting pool 68 generally through the side outlet 64 to impinge on the casting roll 16 cooling surface immediately adjacent to the casting pool 68 surface for the entire length of the roll. It flows out as a curtain flow. It has been found that this maximizes the temperature of the molten metal stream 65 supplied to the meniscus area of the casting pool 68 and significantly reduces cracking and meniscus mark formation on the strip surface.

The molten metal stream 65 falls into the inner trough groove 85 and collides with the floor 63 of the nozzle trough 61 between the two upright partition walls 83, so that the molten metal stream 65 is caused to flow outward by hitting the partition wall 83. The gas contained in the molten metal, which significantly reduces the kinetic energy of the metal, is vented before the metal flow enters the side chamber 82. To ensure that the kinetic energy is reduced, it is important to create a double impact effect by having the partition 83 vertical and meeting the floor 63 at sharply defined corners.

The outlet opening 52 and the side outlet 64 of the distributor 18
Is shifted in the longitudinal direction of the nozzle, so that the molten metal stream 65 collides with the floor 63 of the nozzle trough 61 at a position between the side outlets 64 arranged side by side. The casting pool 68 is raised to a height slightly higher than the bottom of the metal supply nozzle 19, and the surface of the casting pool 68 is slightly higher than the floor of the nozzle trough 61, and is flush with the molten metal in the nozzle trough 61. It has been found that the device can be operated.
In this way, a very stable casting pool 68 state can be obtained. If the triple junction spout 96 is inclined downward at a sufficient angle, a stationary casting pool 68 surface can be obtained.

The outermost molten metal stream 65 flowing down from the distributor 18 is received by the reservoir 88 of the triple point pouring end forming portion 87. The outermost outlet opening 52 of the distributor 18 is aligned so that each reservoir 88 receives a single metal stream impinging on the floor 91 just outside the inner sloped surface 92. The molten metal collides with the floor portion 91 and spreads outward in the floor portion 91 in a fan-like manner. The molten metal reaches the triple point outlet 96 via the triple point injection passage 95, and the inward and downward inclined jet flow of the high-temperature molten metal is directed to the side. Over the surface of the weir and along the casting roll edge on the roll gap side. The triple point pouring is performed only by the shallow and wide molten metal reservoir of each reservoir 88, and the reservoir height of the reservoir 88 is limited by the height of the upper end 89 of the end wall 70. Reservoir 88
Is full, the molten metal can overflow the upper end 89 of the end wall 70 to the nozzle trough 61, so that the end wall 70
Serves as a weir for controlling the reservoir depth of the reservoir 88 of the triple point pouring end forming portion 87. The depth of this reservoir is more than sufficient to provide a constant flow of molten metal to triple point injection passage 95 to achieve a very uniform molten metal flow 65. This control flow is very important for properly forming the strip end. Excessive flow through the triple point injection passage 95 will cause bulges at the end of the strip, while too little will cause skull and "snake egg" defects in the strip.

The bottom surface 98 of the triple junction pouring end forming portion 87 is raised above the surface of the reservoir to prevent cooling of the reservoir surface in the triple junction region. The bottom surface 98 is inclined outward and upward. This is preferable in order to prevent foreign matter such as slag from accumulating and clogging below the end of the metal supply nozzle 19. When such clogging occurs, the escape of gas and fumes from the reservoir is blocked and there is a risk of explosion.

The apparatus described above is merely for illustration and it is a matter of course that the invention is not limited to these details. In particular, it is presently preferred to provide a triple point injection end forming portion in the supply nozzle, but it is not essential to the present invention. By providing a side chamber 82 in accordance with the present invention to create an essentially stable situation at the side outlet 64, the side outlet 64 can be provided as a long slot extending the entire length of the nozzle, which is a suitable nozzle outlet. Shape. However, it is alternatively possible to provide a series of longitudinally spaced outlet slots on each side of the nozzle. Although a series of longitudinally spaced openings 86 are provided in the partition wall 83 as metal flow passages, the partition wall 84 may alternatively be provided in the partition wall 84. Such modifications are possible within the scope of the invention which cover all novel features and combinations thereof described herein.

[0040]

As described above, according to the present invention,
By producing a smooth and uniform flow along the casting surface, it is possible to achieve an excellent effect that disturbance of the casting pool surface can be minimized.

[Brief description of the drawings]

FIG. 1 is an overall view showing a twin roll continuous strip casting apparatus constructed and operated according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the twin roll casting apparatus shown in FIG. 1 including a metal supply nozzle configured according to the present invention.

FIG. 3 is a further longitudinal sectional view in a direction perpendicular to the section of FIG. 2;

FIG. 4 is an enlarged widthwise longitudinal sectional view of a portion adjacent to a metal supply nozzle and a casting roll.

FIG. 5 is a side view of a metal supply nozzle half.

FIG. 6 is a plan view of a metal supply nozzle half shown in FIG. 5;

7 is a longitudinal vertical sectional view of a half of the metal supply nozzle shown in FIG. 5;

FIG. 8 is a perspective view of a metal supply nozzle half shown in FIG. 5;

FIG. 9 is a perspective view of the metal supply nozzle shown in FIG.

FIG. 10 is a view taken in the direction of arrows XX in FIG. 5;

11 is a view in the direction of arrows XI-XI in FIG. 7;

FIG. 12 is a view taken in the direction of the arrows XII-XII in FIG. 7;

[Explanation of symbols]

 19 Metal supply nozzle 20 Metal strip 60 Floor 61 Nozzle trough 64 Side outlet 68 Casting reservoir 82 Side chamber 83,84 Partition wall 86 Opening

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) William John Folder Australia 2533 New South Wales Kiama Downs Kialama Avenue 34

Claims (25)

[Claims] 1. A molten metal is introduced between casting rolls through an elongated metal supply nozzle disposed along and along the roll gap between a pair of cooled casting rolls, and the molten metal is supported above the roll gap. In a metal strip casting method in which a metal casting pool is formed and a casting roll is rotated to cast a solidified strip fed downward from the roll gap, a metal feed nozzle extends in a longitudinal direction of the roll gap to receive molten metal. Consists of a nozzle trough open to
The molten metal flows from the metal supply nozzle through a side outlet into a casting pool, which communicates with a pair of nozzle side chambers extending along each side of the floor of the nozzle trough and projecting upward from the floor. A method of casting metal strip, wherein the molten metal is fed downward into a nozzle trough and flows from the nozzle trough through a side chamber to the casting reservoir from the side outlet. 2. The molten metal is fed downward into a nozzle trough and impinges on a floor between side chambers of the nozzle trough.
The method for casting a metal strip according to claim 1. 3. The metal strip casting method according to claim 1, wherein the molten metal is fed in a series of individual free-falling streams separated in the longitudinal direction of the nozzle trough. 4. The method according to claim 1, wherein the molten metal is delivered in a free-fall continuous curtain flow extending along the nozzle trough.
5. The method for casting a metal strip according to item 1. 5. The side outlet is an elongated hole extending continuously over substantially the entire length of the metal feed nozzle to create an outward curtain flow of molten metal into the casting pool.
5. The metal strip casting method according to any one of claims 1 to 4. 6. The side chamber is formed so as to extend along the bottom corner by partitioning the bottom corner of the nozzle trough from the inside of the nozzle trough by a partition wall disposed in the metal supply nozzle. The metal strip casting method according to any one of the above. 7. The metal strip casting method according to claim 6, wherein the metal flow passage is formed by an opening in the partition wall. 8. A partition wall comprising a pair of laterally spaced upright walls rising from the floor of the nozzle trough and defining a side chamber inner wall, and a chamber top wall extending laterally outward from an upper end of the upright wall. The metal strip casting method according to claim 6, wherein 9. The metal strip casting method according to claim 8, wherein the metal flow path comprises a series of longitudinally spaced openings in each of the upstanding walls that define the inner wall of the side chamber. 10. The method of claim 8, wherein the metal flow path comprises a series of longitudinally spaced openings in the chamber top wall. 11. A pair of parallel casting rolls forming a roll gap therebetween, an elongated metal supply nozzle extending above the roll gap along the roll gap, and supplying molten metal to the roll gap. In a metal strip casting apparatus configured with a distributor arranged above the nozzle and supplying molten metal to the metal supply nozzle, the metal supply nozzle,
An upwardly opening elongated nozzle trough extending longitudinally of the roll gap for receiving molten metal from the distributor; a pair of elongated side chambers each extending upwardly from the nozzle trough floor along each side of the nozzle trough floor; and a nozzle trough. A metal strip casting apparatus comprising: a metal flow opening for flowing molten metal from the inside to the side chamber; and a side exit for flowing molten metal from the bottom of the metal supply nozzle to the outside from the side chamber. . 12. The side outlet is an elongated hole that extends continuously over substantially the entire length of the metal supply nozzle.
2. The metal strip casting apparatus according to claim 1. 13. The side chamber formed by a partition wall disposed within the metal supply nozzle to extend along the bottom corner by separating the bottom corner of the metal supply nozzle from within the nozzle trough. 13. The metal strip casting apparatus according to 11 or 12. 14. The metal strip casting apparatus according to claim 13, wherein the metal flow passage is formed by an opening in the partition wall. 15. A partition wall rising from the floor of the nozzle trough to form a pair of laterally spaced upright walls defining an inner wall of the side chamber, and a chamber top wall extending laterally outward from an upper end of the upright wall. The metal strip casting apparatus according to claim 13, wherein: 16. The metal strip casting apparatus according to claim 15, wherein the metal flow path comprises a series of longitudinally spaced openings in each of the upstanding walls defining the inner wall of the side chamber. 17. The metal strip casting apparatus according to claim 15, wherein the metal flow path comprises a series of longitudinally spaced openings in the chamber top wall. 18. A distributor operable to deliver molten metal downwardly between the side chambers of the nozzle trough so as to impinge on a floor between the side chambers and flow outwardly with respect to the chamber side walls. A metal strip casting apparatus according to any of claims 11 to 15. 19. An upwardly open elongated nozzle trough for receiving molten metal from a distributor, a pair of elongated side chambers each extending upwardly from the floor of the nozzle trough along each side of the floor of the nozzle trough, and from within the nozzle trough. A twin-roll strip casting apparatus, comprising: a metal flow opening for flowing molten metal to a side chamber; and a side exit for flowing molten metal from the bottom of a metal supply nozzle outward from the side chamber. A fire-resistant nozzle that supplies molten metal to the casting pool. 20. The side outlet is an elongated hole extending continuously over substantially the entire length of the metal supply nozzle.
A refractory nozzle for supplying molten metal to a casting pool of the twin roll strip casting apparatus according to the above item. 21. The side chamber formed by a partition wall disposed within the metal supply nozzle to extend along the bottom corner by separating the bottom corner of the metal supply nozzle from within the nozzle trough. 21. A refractory nozzle for supplying molten metal to a casting pool of the twin roll strip casting apparatus according to 19 or 20. 22. A refractory nozzle for supplying molten metal to a casting pool of a twin roll strip casting apparatus according to claim 21, wherein a passage for metal flow is formed by an opening in a partition wall. 23. A pair of laterally spaced upright walls which rise from the floor of the nozzle trough to define the inner wall of the side chamber, and a chamber top wall extending laterally outward from an upper end of the upright wall. 23. A refractory nozzle for supplying molten metal to a casting pool of the twin roll strip casting apparatus according to claim 21 or 22. 24. The casting pool of a twin roll strip casting apparatus according to claim 23, wherein the metal flow path is defined by a series of longitudinally spaced openings in each of the upstanding walls defining the inner wall of the side chamber. Refractory nozzle that supplies molten metal to 25. The refractory nozzle for supplying molten metal to a casting pool of a twin roll strip casting apparatus according to claim 23, wherein the metal flow path comprises a series of longitudinally spaced openings in the chamber top wall.