JP2002113555A - Twin-roll type continuous caster and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a twin-roll type continuous caster in which the flow of the air into roll gap can be restrained. SOLUTION: A large part of the air layer accompanied with the outer peripheral surface of casting rolls according as the rotation of the casting rolls 1a, 1b, is removed with brush rolls 15a, 15b rotatable while bringing into contact with the casting rolls 1a, 1b. Inert gas 7 is supplied into a space 18 surrounded with the outer peripheral surfaces of the casting rolls 1a, 1b, side weirs 2a, a seal chamber 13 and a parting wall 16 to hold the inner part of the space 18 to the inert gas atmosphere. The inert gas 7 is made to flow into the other space 20 adjoined to the brush rolls 15a, 15b from a gap G3 between the parting wall 16 and the outer peripheral surfaces of the cooling rolls 1a, 1b to restrain the flow-in of the air into near the roll gap G1 from the outer part of the seal chamber 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-roll continuous caster and a method for using the same.

[0002]

2. Description of the Related Art Various twin-roll continuous casters have been proposed as means for directly producing a thin plate from molten steel.

FIGS. 5 and 6 show an example of a conventional twin-roll type continuous casting machine. The continuous casting machines are adjacent to each other so as to form a roll gap G1 and their outer peripheral surfaces are directed from the upper side to the roll gap G1. A pair of casting rolls 1a, 1b pivotally supported so as to be able to rotate, a pair of side weirs 2a, 2b in contact with the end surfaces of both casting rolls 1a, 1b, and a roll gap G1 in contact with both side weirs 2a, 2b. And casting roll 1
a, 1b; and a molten steel supply means 5 capable of supplying molten steel 4 from above to between the casting rolls 1a, 1b.

[0004] Cooling water for suppressing the temperature rise of the casting rolls 1a and 1b and accelerating the solidification of the molten steel 4 can flow through the inside of each of the casting rolls 1a and 1b.

[0005] Seal chamber 3 and casting rolls 1a, 1b
An air gap G2 is formed between the outer peripheral surface of the airtight member and the outer peripheral surface of the airtight member in order to avoid contact between them.

The seal chamber 3 is provided with a gas supply pipe 8 for flowing an inert gas 7 into an outer peripheral surface of the casting rolls 1a and 1b, side dams 2a and 2b, and a space 6 surrounded by the seal chamber 3. Have been.

[0007] The molten steel supply means 5 is disposed above the seal chamber 3 and is capable of storing the molten steel 4 in a tundish 9.
And a nozzle 10 that penetrates through the seal chamber 3 and allows the molten steel 4 to flow down from the tundish 9 to between the casting rolls 1a and 1b.

When the thin plate 11 is manufactured by the twin-roll type continuous casting machine shown in FIG. 5 and FIG.
After setting the interval between the rotation centers of the casting rolls 1a and 1b so that a roll gap G1 corresponding to the thickness of the casting rolls is formed,
The casting rolls 1a and 1b are rotated so that their outer peripheral surfaces move from the upper side toward the roll gap G1.

Next, the molten steel 4 is supplied to the tundish 9 and the molten steel 4 is supplied from the nozzle 10 to the casting rolls 1a, 1a.
When the casting rolls 1a and 1b flow down, solidified shells 12 are formed on the outer peripheral surfaces of the casting rolls 1a and 1b, and the thin plate 11 is sent downward by the rotation of the casting rolls 1a and 1b.

At this time, the inert gas 7 is continuously supplied from the gas supply pipe 8 to the space 6 inside the seal chamber 3, and the gap G2 between the seal chamber 3 and the outer peripheral surfaces of the casting rolls 1a and 1b. The space 6 is made oxygen-free by flowing it out from the outside, thereby suppressing oxidation of the molten steel 4 between the casting rolls 1a and 1b.

[0011]

However, in the twin-roll type continuous casting machine shown in FIGS. 5 and 6, the supply amount of the inert gas 7 to the space 6 is increased, and the internal pressure of the space 6 is controlled by the gauge pressure. Even if the pressure is increased to about 1000 Pa, oxygen exists in the space 6 at a concentration of about 0.2%.

For this reason, the manganese (M) contained in the molten steel 4
n) is oxidized to form a manganese oxide (MnO) coating layer on the outer peripheral surfaces of the casting rolls 1a and 1b at a rate of 20 μm per 10 minutes.

The carbon monoxide (CO) bubbles generated by the reaction of the carbon (C) contained in the molten steel 4 and the refractory with the oxygen in the space 6 and the decomposed oxygen of manganese oxide are generated in the casting rolls 1a, It mixes with the molten steel 4 between 1b and causes the surface crack of the thin plate 11.

Further, when manufacturing the thin plate 11 from aluminum killed steel, it is required to keep the oxygen concentration in the space 6 at about 10 ppm in order to prevent oxidation of aluminum.

As described above, even if the supply amount of the inert gas 7 to the space 6 is increased, the reason why oxygen exists in the space 6 is that the outer peripheral surface of the casting rolls 1a and 1b accompanies the rotation thereof. The air layer having a thickness of about 50 to 100 μm enters the space 6.

The entrainment of the air layer accompanying the rotation of the casting rolls 1a and 1b is caused by the boundary layer effect and the formation of rough irregularities on the roll surface.

The present invention has been made in view of the above-mentioned circumstances, and a twin-roll type continuous casting machine capable of suppressing the inflow of air into the vicinity of a roll gap and improving the quality of a slab, and a method of using the same. It is intended to provide.

[0018]

According to a first aspect of the present invention, there is provided a twin-roll continuous casting machine, comprising: a pair of casting rolls which are substantially horizontally juxtaposed to form a roll gap; A pair of side weirs in contact with the end faces of both casting rolls, a seal chamber in contact with both side weirs and covering the roll gap and the casting roll from above, and a side seal connected to the seal chamber so as to cover the casting roll from its end face side. A pair of brushes extending in the same direction as the casting roll and in contact with both the outer peripheral surface of the casting roll and the end of the seal chamber; and a seal extending in the same direction as the casting roll and located at an intermediate position between each brush and the roll. A partition wall protruding from the chamber to the vicinity of the outer peripheral surface of the casting roll, molten steel supply means capable of supplying molten steel from above to between the casting rolls, an outer peripheral surface of the casting roll, a side weir, Ruchanba, and a means for flowing the non-oxidizing gas into the space surrounded by the partition walls.

In the twin-roll continuous casting machine according to a second aspect of the present invention, a pair of casting rolls which are substantially horizontally juxtaposed to form a roll gap, and a pair of side weirs which are in contact with end faces of both casting rolls. A seal chamber in contact with both side weirs and covering the roll gap and the casting roll from above, a side seal connected to the seal chamber so as to cover the casting roll from its end face side, and a casting roll extending in the same direction as the casting roll. A pair of brushes that can rotate in contact with both the outer peripheral surface and the end of the seal chamber; and a pair of brushes extending in the same direction as the casting roll and located between the brushes and the gap between the seal chamber and the outer peripheral surface of the casting roll. A projecting partition wall,
Molten steel supply means capable of supplying molten steel between the casting rolls from above, an outer peripheral surface of the casting roll, a side weir, a seal chamber,
And means for allowing the non-oxidizing gas to flow into a space surrounded by the partition wall.

In the twin roll continuous casting machine according to the third aspect of the present invention, a pair of casting rolls which are arranged substantially horizontally and form a roll gap, and a pair of side weirs which are in contact with the end surfaces of both casting rolls are provided. A seal chamber in contact with both side weirs to cover the roll gap and the casting roll from above, a side seal connected to the seal chamber so as to cover the casting roll from its end face side, and both ends of the seal chamber extending in the same direction as the casting roll. And an end wall protruding in the vicinity of the outer peripheral surface of the casting roll connected to the portion, and disposed on the outer side of the end wall so as to extend in the same direction as the casting roll and rotate in contact with the outer peripheral surface of the casting roll. A pair of brushes, a partition wall extending in the same direction as the casting rolls and located midway between the brushes and the roll gap and projecting from the seal chamber to the vicinity of the outer peripheral surface of the casting rolls; And the molten steel supply means capable of supplying molten steel into the inter-Le, the outer peripheral surface of the casting rolls, side weirs, a sealing chamber, and means for flowing a non-oxidizing gas into the space surrounded by the partition walls.

In the twin-roll continuous casting machine according to a fourth aspect of the present invention, in addition to the configuration of the twin-roll continuous casting machine according to any one of the first to third aspects of the present invention, each brush is provided. A plurality of partition walls are provided between the roll gap.

In the method of using a twin-roll continuous casting machine according to a fifth aspect of the present invention, each of the casting rolls is rotated so that the outer peripheral surface thereof moves from above to the gap between the rolls, and the rolls are supplied from the molten steel supply means. Supplying molten steel to the gap to supply non-oxidizing gas to the space surrounded by the outer peripheral surface of the casting roll, side weirs, seal chambers, and partition walls when continuously sending thin sheets downward from the roll gap I do.

In the method of using the twin-roll continuous casting machine according to a sixth aspect of the present invention, each casting roll is rotated so that the outer peripheral surface moves from above to the gap between the rolls, and the roll is supplied from the molten steel supply means. Supplying molten steel to the gap to supply non-oxidizing gas to the space surrounded by the outer peripheral surface of the casting roll, side weirs, seal chambers, and partition walls when continuously sending thin sheets downward from the roll gap And continuously rotate the brush.

In the present invention, most of the air layer that accompanies the outer peripheral surface of the casting roll as it rotates is removed by a brush in contact with the casting roll, and the non-oxidizing gas is removed from the outer peripheral surface of the casting roll. By supplying the space surrounded by the side weir, the seal chamber, and the partition wall to maintain the space in an oxidizing gas atmosphere, the oxygen concentration in the seal chamber is reduced, and the space between the partition wall and the outer peripheral surface of the casting roll is reduced. By letting out the non-oxidizing gas from the gap to the brush side, the remaining air layer accompanying the outer peripheral surface of the casting roll is blown off, and the inflow of air from outside the seal chamber to the vicinity of the roll gap is suppressed.

Further, by rotating the brush in contact with the casting roll, the air layer is effectively removed from the outer peripheral surface of the casting roll.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a twin-roll type continuous casting machine according to the present invention. In the drawings, the same reference numerals as those in FIGS. 5 and 6 denote the same parts. ing.

This twin-roll type continuous casting machine has a seal chamber 13 in contact with both side dams 2a, 2b and covering the roll gap G1 and the casting rolls 1a, 1b from above, and at a position adjacent to the side dams 2a, 2b. Casting rolls 1a, 1b
And a side seal 14 connected to the seal chamber 13 so as to cover from the end face side, and extend in the axial direction of the casting rolls 1a and 1b, and can rotate in contact with the outer peripheral surfaces of the casting rolls 1a and 1b and the end of the seal chamber 13. The pair of brush rolls 15a, 15b and the casting rolls 1a, 1b extend in the axial direction and are located between the brush rolls 15a, 15b and the gap G1 from the seal chamber 13 to the vicinity of the outer peripheral surfaces of the casting rolls 1a, 1b. A projecting partition wall 16,
There is provided molten steel supply means 17 capable of supplying molten steel 4 between the casting rolls 1a and 1b from above.

The seal chamber 13 is formed in a concave shape in which a portion located immediately above the roll gap G1 is lower than a portion located near the rotation center of the casting rolls 1a and 1b.

Further, in the vicinity of the center of the seal chamber 13, the outer peripheral surfaces of the casting rolls 1a, 1b, the side weirs 2a, 2
b, an opening 19 for supplying an inert gas 7 such as nitrogen to a space 18 surrounded by the seal chamber 13 and the partition wall 16 is vertically formed.

The brush rolls 15a and 15b have substantially half end surfaces covered with side seals 14.

The brush rolls 15a and 15b are driven by a driving mechanism (not shown) at 1200 to 1400 per minute.
It is configured to rotate continuously by about one degree.

A gap G3 is formed between the partition wall 16 and the outer peripheral surfaces of the casting rolls 1a and 1b in order to avoid contact between them, and the gap G3 is supplied from the above-described opening 19 to the space 18. The inert gas 7 passes through the gap G3, is adjacent to the space 18 and is formed on the outer peripheral surfaces of the casting rolls 1a and 1b, the side dams 2a and 2b, the seal chamber 13, the partition wall 16, and the brush rolls 15a and 15b. It flows into the enclosed space 20.

The molten steel supply means 17 includes the seal chamber 13
It comprises a tundish 21 disposed above and capable of storing the molten steel 4, and a core 22 that penetrates through the seal chamber 13 and uniformly flows the molten steel 4 from the tundish 21 to between the casting rolls 1 a and 1 b. .

Between the bottom surface of the tundish 21 and the upper surface of the seal chamber 13, there is provided a seal member 23 for maintaining the airtightness of the concave portion of the seal chamber 13, and an inert gas is introduced into the space 18 from an opening 19 formed in the seal chamber 13. A gas supply pipe 24 through which the gas 7 flows is interposed.

When the thin plate 11 is manufactured by the twin-roll type continuous casting machine shown in FIGS.
After setting the interval between the rotation centers of the casting rolls 1a and 1b so that a roll gap G1 corresponding to the thickness of the casting rolls is formed,
The casting rolls 1a and 1b are rotated so that their outer peripheral surfaces move from the upper side toward the roll gap G1.

Further, each of the brush rolls 15a and 15b is
The casting rolls 1a and 1b are continuously rotated at a speed much higher than the peripheral speed, that is, about 1200 to 1400 per minute.

Further, the inert gas 7 is continuously supplied from the gas supply pipe 24 to the space 18 through the opening 19, and the inert gas 7 flowing into the space 20 through the gap G3 is supplied to the brush rolls 15a and 15b. Let it flow out between the strands.

Next, the molten steel 4 is supplied to the tundish 21 and the molten steel 4 is supplied from the core 22 to the casting rolls 1 a, 1.
When the casting rolls 1a and 1b flow down, solidified shells 12 are formed on the outer peripheral surfaces of the casting rolls 1a and 1b, and the thin plate 11 is sent downward by the rotation of the casting rolls 1a and 1b.

At this time, most of the air layer of about 50 to 100 μm which accompanies the outer peripheral surface accompanying the rotation of the casting rolls 1a and 1b is removed by the rotation of the brush rolls 15a and 15b. Cleaning of the outer peripheral surfaces of 1a and 1b is also performed.

After the inert gas 7 is supplied to the space 18 above the roll gap G1, it flows from the gap G3 into the space 20 on the side of the brush rolls 15a and 15b. Even if a small amount of air accompanies, the air concentration decreases in the direction of rotation of the casting rolls 1a, 1b, that is, in the order of the spaces 20, 18.

Thus, even if the supply amount of the inert gas 7 to the space 18 is set to a gauge pressure of about 5 to 20 Pa, the oxygen concentration in the space 18 becomes 0.01% or less, Inflow of air into the vicinity of the gap G1 can be effectively suppressed, and consumption of the inert gas 7 can be reduced.

Accordingly, the casting rolls 1a, 1
b. No manganese oxide coating layer is formed on the outer peripheral surface of b.
1 can avoid surface cracks, and also enables continuous casting of metals that require an extremely low oxygen concentration atmosphere, such as aluminum killed steel.

The rotating direction of each of the brush rolls 15a and 15b may be such that an air layer accompanying the outer peripheral surface of the casting rolls 1a and 1b is swept to the upstream side in the moving direction of the outer peripheral surface. Conversely, even if the air is swept to the space 20 side, the inert gas 7 flowing into the space 20 via the gap G3 prevents the air from entering the space 18, so that there is no problem.

Further, for example, if another partition wall is provided between the partition wall 16 and the brush rolls 15a and 15b and the number of spaces inside the seal chamber 13 is increased, the oxygen concentration near the roll gap G1 is further reduced. It becomes possible.

FIGS. 3 and 4 show another embodiment of the twin-roll type continuous casting machine according to the present invention. In the drawings, the same reference numerals as those in FIGS. 1 and 2 denote the same parts. Is represented.

The twin-roll type continuous casting machine has a seal chamber 25 in contact with both side dams 2a and 2b and covering the roll gap G1 and the casting rolls 1a and 1b from above, and a position adjacent to the side dams 2a and 2b. Casting rolls 1a, 1b
And a side end extending in the axial direction of the casting rolls 1a and 1b and protruding from both ends of the sealing chamber 25 to the vicinity of the outer peripheral surfaces of the casting rolls 1a and 1b. The wall 26 and a pair of brush rolls 15a, which extend in the axial direction of the casting rolls 1a, 1b and are arranged on the outer side of each end wall 26 so as to be able to rotate in contact with the outer peripheral surface of the casting rolls 1a, 1b.
15b and the casting rolls 1a, 1b extending in the axial direction of the casting rolls 1a, 1b and located between the brush rolls 15a, 15b and the roll gap G1.
and b. a partition wall 16 protruding near the outer peripheral surface of b.

The seal chamber 25 is formed in a concave shape in which a portion located immediately above the roll gap G1 is lower than a portion located near the rotation center of the casting rolls 1a and 1b.

Further, in the vicinity of the center of the seal chamber 25, the outer peripheral surfaces of the casting rolls 1a and 1b, the side weirs 2a and 2
b, an opening 19 for supplying an inert gas 7 such as nitrogen to the space 18 surrounded by the seal chamber 25 and the partition wall 16 is vertically formed.

A gap G4 is formed between the end wall 26 and the outer peripheral surfaces of the casting rolls 1a and 1b in order to avoid contact between them, and a gap G4 is formed from the opening 19 described above to the space 18. The supplied inert gas 7 passes through the gap G3 and is adjacent to the space 18 and at the outer peripheral surfaces of the casting rolls 1a and 1b, the side dams 2a and 2b, the seal chamber 25, the partition wall 16, and the end wall 26. It flows into the enclosed space 27.

The core 22 of the molten steel supply means 17 penetrates through the seal chamber 25 so that the molten steel 4 flows down uniformly between the casting rolls 1a and 1b.

Between the bottom surface of the tundish 21 and the upper surface of the seal chamber 25, a sealing member 23 for maintaining the airtightness of the concave portion of the seal chamber 25, and an inert gas is introduced into the space 18 from an opening 19 formed in the seal chamber 25. A gas supply pipe 24 through which the gas 7 flows is interposed.

When the thin plate 11 is manufactured by the twin-roll continuous casting machine shown in FIGS.
After setting the interval between the rotation centers of the casting rolls 1a and 1b so that a roll gap G1 corresponding to the thickness of the casting rolls is formed,
The casting rolls 1a and 1b are rotated so that their outer peripheral surfaces move from the upper side toward the roll gap G1.

The brush rolls 15a and 15b are
Rotate continuously.

Further, the inert gas 7 is continuously supplied from the gas supply pipe 24 to the space 18 through the opening 19, and the inert gas 7 flowing into the space 27 through the gap G3 is cast with the end wall 26. The rolls 1a and 1b are caused to flow outward from a gap G4 between the rolls 1a and 1b.

Next, the molten steel 4 is supplied to the tundish 21, and the molten steel 4 is separated from the core 22 by the casting rolls 1 a, 1.
When the casting rolls 1a and 1b flow down, solidified shells 12 are formed on the outer peripheral surfaces of the casting rolls 1a and 1b, and the thin plate 11 is sent downward by the rotation of the casting rolls 1a and 1b.

At this time, most of the air layer of about 50 to 100 μm that accompanies the outer peripheral surface accompanying the rotation of the casting rolls 1a and 1b is removed by the rotation of the brush rolls 15a and 15b. Cleaning of the outer peripheral surfaces of 1a and 1b is also performed.

The inert gas 7 is supplied to the space 18 above the roll gap G1 and then flows from the gap G3 into the space 27 on the side of the brush rolls 15a and 15b. Even if a small amount of air accompanies, the air concentration decreases in the rotating direction of the casting rolls 1a and 1b, that is, in the order of the spaces 27 and 18.

Further, in the twin-roll type continuous casting machine shown in FIGS. 3 and 4, the brush rolls 15a and 15b are arranged outside the seal chamber 25,
5 is provided with an end wall 26 projecting to the vicinity of the outer peripheral surface of the casting rolls 1a and 1b, so that broken pieces or dropped pieces of the wires of the brush rolls 15a and 15b are removed.
Adhering to the outer peripheral surfaces of a and 1b and mixing into the molten steel 4 can be suppressed.

The twin-roll continuous casting machine and the method of using the same according to the present invention are not limited to the above-described embodiment, and other inert gas such as argon may be replaced with non-oxidizing gas instead of nitrogen. Using a mixture of an inert gas and a reducing gas as the non-oxidizing gas, changing the number of partition walls provided in the seal chamber, and fixing brushes instead of brush rolls It goes without saying that other modifications can be made without departing from the scope of the present invention.

[0061]

As described above, according to the twin-roll continuous casting machine and the method of using the same according to the present invention, various excellent effects as described below can be obtained.

(1) The brush in contact with the casting roll removes most of the air layer that accompanies the outer peripheral surface of the casting roll with the rotation of the casting roll. To the space surrounded by the surface, the side weir, the seal chamber, and the partition wall to maintain the space in a non-oxidizing gas atmosphere, and the non-oxidizing property to the brush roll side from the gap between the partition wall and the outer peripheral surface of the casting roll. Since the gas is allowed to flow out, the flow of air from outside the seal chamber to the vicinity of the roll gap can be suppressed, and the consumption of non-oxidizing gas can be reduced.

(2) Therefore, it is possible to avoid the formation of a manganese oxide coating layer on the outer peripheral surface of the casting roll and the surface cracking of the thin plate due to the mixing of bubbles of carbon monoxide into the molten steel.

(3) Further, if a brush is disposed outside the seal chamber and an end wall protruding near the outer peripheral surface of the casting roll is provided at an end of the seal chamber, broken pieces of the wire of the brush, It is possible to prevent the falling pieces from adhering to the casting roll and being mixed into the molten steel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of a twin-roll continuous casting machine of the present invention.

FIG. 2 is a partial perspective view showing an example of an embodiment of a twin-roll continuous casting machine of the present invention.

FIG. 3 is a cross-sectional view showing another example of the embodiment of the twin-roll continuous casting machine of the present invention.

FIG. 4 is a partial perspective view showing another example of the embodiment of the twin-roll continuous casting machine of the present invention.

FIG. 5 is a cross-sectional view showing an example of a conventional twin-roll type continuous casting machine.

FIG. 6 is a partial perspective view showing an example of a conventional twin-roll type continuous casting machine.

[Explanation of symbols]

1a, 1b Casting roll 2a, 2b Side weir 4 Molten steel 7 Inert gas (non-oxidizing gas) 13 Seal chamber 14 Side seal 15a, 15b Brush roll (brush) 16 Partition wall 17 Molten steel supply means 18 Space 24 Gas supply pipe ( Means for injecting non-oxidizing gas) 25 Seal chamber 26 End wall G1 Roll gap

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Otsuka 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Machinery and Plant Development Center (72) Inventor Akihiro Nomura Isogo-ku, Yokohama-shi, Kanagawa No. 1 Shin-Nakahara-cho Ishi Kawashima-Harima Heavy Industries Co., Ltd. Machinery & Plant Development Center (72) Inventor Hisahiko Fukase No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. 4E004 DA13 SB02 SB07

Claims (6)

[Claims] 1. A pair of casting rolls arranged substantially horizontally side by side to form a roll gap, a pair of side weirs in contact with end faces of both casting rolls, and a roll gap and a casting roll in contact with both side weirs from above. A sealing chamber to be covered, a side seal connected to the sealing chamber so as to cover the casting roll from its end face side, and a pair of brushes extending in the same direction as the casting roll and in contact with both the outer peripheral surface of the casting roll and the end of the sealing chamber. A partition wall extending in the same direction as the casting roll and located between the brushes and the roll gap and projecting from the seal chamber to the vicinity of the outer peripheral surface of the casting roll; and a molten steel supply capable of supplying molten steel from above to between the casting rolls. Means, and means for flowing the non-oxidizing gas into the space surrounded by the outer peripheral surface of the casting roll, the side weir, the seal chamber, and the partition wall. Twin roll continuous casting machine. 2. A pair of casting rolls arranged substantially horizontally side by side to form a roll gap, a pair of side weirs in contact with end faces of both casting rolls, and a roll gap and a casting roll in contact with both side weirs from above. A sealing chamber to be covered, a side seal connected to the sealing chamber so as to cover the casting roll from the end face side, and a rotary member that extends in the same direction as the casting roll and contacts both the outer peripheral surface of the casting roll and the end of the sealing chamber. A pair of brushes to be obtained, a partition wall extending in the same direction as the casting rolls and located between the brushes and the gap between the brushes and projecting from the seal chamber to the vicinity of the outer peripheral surface of the casting rolls, and supplying molten steel from above to between the casting rolls. And a means for injecting a non-oxidizing gas into the space surrounded by the outer peripheral surface of the casting roll, the side weir, the seal chamber, and the partition wall. A twin-roll continuous casting machine characterized in that: 3. A pair of casting rolls arranged substantially horizontally side by side to form a roll gap, a pair of side weirs in contact with end faces of both casting rolls, and a roll gap and a casting roll in contact with both side weirs from above. A sealing chamber to be covered, a side seal connected to the seal chamber so as to cover the casting roll from its end face side, and an end extending in the same direction as the casting roll and connected to both ends of the sealing chamber and protruding near the outer peripheral surface of the casting roll. A wall, a pair of brushes extending in the same direction as the casting roll and arranged on the outer side of the end wall so as to be able to rotate in contact with the outer peripheral surface of the casting roll; A partition wall located in the middle of the roll gap and protruding from the seal chamber to the vicinity of the outer peripheral surface of the casting roll; molten steel supply means capable of supplying molten steel from above to between the casting rolls; And a means for allowing a non-oxidizing gas to flow into a space surrounded by the outer peripheral surface, the side weir, the seal chamber, and the partition wall of the twin-roll type continuous casting machine. 4. The twin-roll continuous casting machine according to claim 1, wherein a plurality of partition walls are provided between each brush and the roll gap. 5. By rotating each casting roll so that its outer peripheral surface moves from above to the roll gap, and supplying molten steel from the molten steel supply means to the roll gap,
When continuously sending thin sheets downward from the roll gap,
The method for using the twin-roll continuous casting machine according to claim 1, wherein the non-oxidizing gas is supplied to a space surrounded by an outer peripheral surface of the casting roll, a side weir, a seal chamber, and a partition wall. 6. Rotating each casting roll so that its outer peripheral surface moves from above to the roll gap, and supplying molten steel from the molten steel supply means to the roll gap.
When continuously sending thin sheets downward from the roll gap,
The twin roll according to claim 2 or 3, wherein the non-oxidizing gas is supplied to a space surrounded by an outer peripheral surface of the casting roll, a side weir, a seal chamber, and a partition wall, and the brush is continuously rotated. How to use a continuous casting machine.