CN114761155B - Foaming plate for sliding nozzle - Google Patents
Foaming plate for sliding nozzle Download PDFInfo
- Publication number
- CN114761155B CN114761155B CN202180006512.7A CN202180006512A CN114761155B CN 114761155 B CN114761155 B CN 114761155B CN 202180006512 A CN202180006512 A CN 202180006512A CN 114761155 B CN114761155 B CN 114761155B
- Authority
- CN
- China
- Prior art keywords
- ring
- plate body
- inner hole
- fitting
- concave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005187 foaming Methods 0.000 title description 4
- 239000006260 foam Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 239000011819 refractory material Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 27
- 238000007664 blowing Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/42—Features relating to gas injection
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
Abstract
The purpose of the present invention is to prevent molten steel from entering a gas cell in a foam plate having a structure in which a ring is disposed in an inner hole of a plate body. In a foam board (1) for a sliding nozzle used for continuous casting of steel, an annular part (ring (3)) having a ventilation function is mounted in an inner hole (2 d) of a board body (2). A step part (3 a) or a convex part or a concave part is arranged on the lower end surface of the ring (3), and a step part (2 a) or a concave part or a convex part which can be embedded opposite to the step part (3 a) or the convex part or the concave part is arranged on the upper surface of the plate body (2) contacting the lower end surface of the ring (3). A portion (fitting portion (A)) where the step portion (3 a) or the convex portion or the concave portion on the ring (3) side is fitted with the step portion (2 a) or the concave portion or the convex portion on the plate body (2) side has a length of 2mm or more in the central axis direction (longitudinal direction) of the inner hole (2 d), and mortar is present at least in the longitudinal joint portion of the fitting portion (A).
Description
Technical Field
The present invention relates to a so-called foam sheet structure having a gas blowing function for a sliding nozzle used in continuous casting of steel.
Background
As the upper plate of the sliding nozzle device, a so-called foam plate is often used, and a gas permeable refractory for blowing gas into the molten metal is disposed in the inner hole thereof. In order to prevent inclusions such as alumina from adhering to the molten steel discharge path, i.e., the inner hole (nozzle hole) of each nozzle, the foam plate has a function of blowing an inert gas such as argon gas into the inner hole.
As such a foam sheet, patent document 1 discloses a gas blowing device in which a blowing ring (tubular air-permeable refractory) is disposed in an inner hole of a bottom plate (sheet body). In this gas blowing device, a blowing ring is provided so that the bottom surface contacts and engages with a portion of the bottom plate (plate body) where diameter reduction occurs below the inner hole, and an iron cylinder is provided on the outer peripheral surface of the blowing ring.
Patent document 2 discloses an upper plate for gas injection, in which an annular projection is formed on an upper plate refractory (plate body), and a gas passage (tubular breathable refractory) having gas introduction holes is disposed inside the projection.
Patent literature
Patent document 1: japanese patent application laid-open No. 6-41962
Patent document 2: japanese patent application laid-open No. 2004-268106
Disclosure of Invention
The above patent documents each have a structure in which a tubular air-permeable refractory, namely, an annular member (hereinafter, also referred to as "ring") having an air-permeable function is fitted into an inner hole of a plate body, and a lower end surface of the ring is brought into contact with an upper surface of the plate body (including a case of using mortar) to fix the ring.
However, in such a conventional ring installation structure, molten steel enters a pool (hereinafter simply referred to as "pool") provided between the outer periphery of the ring and the plate body and solidifies, and a failure in which the supply of gas to the ring is stopped often occurs.
The technical subject of the invention is to prevent molten steel from entering a gas pool in a foaming plate with a structure that a ring is arranged in an inner hole of a plate body.
The present invention is a foam sheet described in the following 1 to 7.
1. A foam sheet for a sliding nozzle used for continuous casting of steel, characterized in that,
A ring is arranged in the inner hole of the plate body, the ring is an annular part with ventilation function,
The ring has a first step portion or a first convex portion or a first concave portion on a lower end surface thereof,
A second step portion or a second recess portion or a second projection portion which can be fitted to the first step portion or the first projection portion or the first recess portion so as to face the lower end surface of the ring is provided on the upper surface of the plate body,
The length of the first step portion or the first convex portion or the first concave portion of the ring in the longitudinal direction of the fitting portion in which the first step portion or the second concave portion or the second convex portion of the plate body is fitted is 2mm or more, the longitudinal direction being the central axis direction of the inner hole,
Mortar is present at least at the longitudinal joint portion of the fitting portion,
The first step portion of the ring is formed such that an outer peripheral side of the ring protrudes downward from the inner hole of the ring, the second step portion of the plate body is formed such that the inner hole of the plate body protrudes upward from the outer peripheral side of the plate body, and a surface of a part or all of the longitudinal directions of the first step portion and the second step portion is parallel to a central axis of the inner hole,
In the fitting portion constituted by the first convex portion of the ring and the second concave portion of the plate body, a part or all of the longitudinal direction of the fitting surface located in the inner hole is parallel to a central axis of the inner hole,
In the fitting portion constituted by the first concave portion of the ring and the second convex portion of the plate body, a part or all of the longitudinal direction of a fitting surface located on an outer peripheral side is parallel to a central axis of the inner hole.
2. The foam sheet according to item 1, wherein the gas permeable portion of the ring is made of a porous refractory material.
3. The foam sheet according to item 1, wherein the gas permeable portion of the ring is a refractory member having one or more through holes.
According to the present invention, in the foam sheet having the structure in which the ring is disposed in the inner hole of the sheet body, the intrusion of molten steel into the gas pool can be prevented. This can prevent the degradation of the quality of steel due to the stop of the blowing function and the adverse effect on the operation due to the blocking of the molten steel passage (inner hole).
Drawings
Fig. 1 is a cross-sectional view of a main part of a foam board according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a main part of a foam board according to another embodiment of the present invention.
Fig. 3 is a cross-sectional view of a main part of a foam board according to still another embodiment of the present invention.
Fig. 4 is an enlarged view of the fitting portion on the foam board of fig. 1.
Fig. 5 is a diagram showing an example of a conventional normal foam sheet.
Symbol description
1-Foaming plate; 2-a plate body; 2 a-step; 2 b-recesses; 2 c-a protrusion; 2 d-inner hole; a 3-ring; 3 a-step; 3 b-a protrusion; 3 c-recesses; 4-an air pool; a horizontal seam between the lower end surface of the 5-ring and the upper surface of the plate body; 6-a longitudinal seam of the fitting portion; 7-a gas introduction path; a-an engaging part; b-central axis of the bore (longitudinal direction).
Detailed Description
As shown in fig. 5, in the conventional normal foam board 1, a contact surface (hereinafter, referred to as a "joint surface") between the lower end surface of the ring 3 attached to the inner hole 2d of the board body 2 and the upper surface of the board body 2 is a substantially uneven plane.
From the observation of the raw metal intrusion product, the present inventors found that intrusion into the gas pool 4 of the raw metal mainly occurs via the joint surface.
The main causes thereof may be, for example, inclination at the time of installation of the ring 3, uneven joint thickness, precision between the ring 3 and the plate body 2, and the like. In particular, in the case of a structure in which the ring 3 and the plate body 3 are in linear contact with each other, a gap is likely to occur in a joint portion between the two due to relative movement or displacement of the two, or mortar in the joint portion may disappear due to a partial breakage or the like. Further, since the ring 3 and the plate body 2 are in linear contact with each other, the gap formed is easily communicated with the gas pool 4 on the outer peripheral side.
For this reason, in the present invention, as illustrated in fig. 1 to 3, the ring 3 and the plate body 2 are in a structure of being in linear contact with each other, that is, a stepped portion 3a or a convex portion 3b or a concave portion 3c is provided on the lower end surface of the ring 3, and a stepped portion 2a or a concave portion 2b or a convex portion 2c capable of being fitted to the stepped portion 3a or the convex portion 3b or the concave portion 3c on the ring 3 side is provided on the upper surface of the plate body 2 in contact with the lower end surface of the ring 3, and the lower end surface of the ring 3 and the upper surface of the plate body 2 are fitted to each other by a joint.
Specifically, in the foam board 1 shown in fig. 1, the stepped portion 3a on the ring 3 side is fitted to the stepped portion 2a on the board body 2 side to constitute a fitting portion a.
In the foam board 1 shown in fig. 2, the convex portion 3b on the ring 3 side is fitted with the concave portion 2b on the board body 2 side to constitute a fitting portion a.
In the foam board 1 shown in fig. 3, the concave portion 3c on the ring 3 side is fitted with the convex portion 2c on the board body 2 side to constitute a fitting portion a.
Reference numeral 7 in fig. 1 to 3 and 5 denotes a gas introduction path for introducing a gas into the gas cell 4.
In the present invention, the longitudinal length of the fitting portion a (hereinafter referred to as "fitting length") is 2mm or more. That is, the present inventors have found that, in the fitting portion a between the ring 3 and the plate body 2, the fitting length is required to be 2mm or more in order to maintain the mechanical fixation of both, that is, in order to maintain the structure of abutting so as to fix each other.
For example, as shown in fig. 4, the fitting length is the length L in the longitudinal direction of the fitting portion a between the lower end surface of the ring 3 and the upper surface of the plate body 2, excluding the thickness of the horizontal joint portion 5. In addition, when the fitting portion a is formed of the concave-convex portion as shown in fig. 2 and 3, the fitting length is 2mm or more on the inner hole side and the outer peripheral side, but any fitting length in the present invention may be 2mm or more.
Although the upper limit of the fitting length is not limited, practically, the joint portion between the outer periphery of the ring and the plate body (for example, the length of the joint portion from the upper end of the ring and the plate body to about 5 to 10 mm) and the longitudinal length of the air cell may be ensured, and the remaining dimension (for example, about 40 mm) of the joint portion and the longitudinal length of the air cell may be subtracted from the longitudinal length of the plate body hole.
In the present invention, mortar is present in at least the longitudinal joint 6 (see fig. 4) of the fitting portion a. That is, in the foam board 1 shown in fig. 1, mortar exists in the longitudinal joint portion of the fitting portion a formed by the stepped portion 3a on the ring 3 side and the stepped portion 2a on the board body 2 side. In addition, when the fitting portion a is formed of the concave-convex portion as shown in fig. 2 and 3, the longitudinal joint portion of the fitting portion a exists at the inner hole side and the outer peripheral side 2, but in the present invention, mortar may exist at any one of the longitudinal joint portions.
As described above, since mortar is present at the longitudinal joint portion of the fitting portion a, even if the ring 3 is provided so as to be slightly inclined with respect to the plate body 2, a gap is less likely to occur at least at the longitudinal joint portion.
Incidentally, in the foam board 1 of fig. 1 to 3, mortar exists at the joint portions of all the fitting portions.
According to the present invention, the ring 3 and the plate body 2 are non-linear, and the contact surface is provided, which is hardly affected by the deviation or the like when the ring 3 is provided, so that the molten steel can be prevented from entering the gas pool 4 on the outer peripheral side.
In addition to the main reasons, the inventors have found that the thermal conditions in the casting (use) are also the cause.
That is, the plate body 2 is denser than the ring 3, and is generally made of a refractory material composed of a component having high thermal conductivity, and also has a large thermal expansion due to a large number of surfaces contacting molten steel during casting. In contrast, the ring 3 continuously cooled by the gas is lower in temperature than the plate body 2, and even if the ring 3 has the same thermal expansion characteristics, the ring is less thermally expanded than the plate body 2.
As a result, a gap may be formed at the joint portion, and molten steel may infiltrate into the gas pool 4.
In the present invention, for this reason, it is preferable to arrange the plate body 2 having a thermal expansion relatively larger than that of the ring 3 on the inner hole side and arrange the ring 3 having a thermal expansion relatively smaller than that of the plate body 2 on the outer peripheral side. By this, the plate body 2 presses the longitudinal joint portion between the pressing ring 3 by expanding the pressing ring, and the gap is further less likely to occur.
Specifically, when the stepped portions are fitted to each other as shown in fig. 1, the stepped portion 3a on the ring 3 side is formed to include a portion to be fitted, the outer peripheral side of the ring 3 protrudes downward from the inner hole 2d side of the ring 3, and the stepped portion 2a on the plate body 2 side is formed to protrude upward from the inner hole 2d side of the plate body 2 than the outer peripheral side of the plate body 2.
When the convex portion 3b on the ring 3 side is fitted into the concave portion 2b on the plate body 2 side as shown in fig. 2, or when the concave portion 3c on the ring 3 side is fitted into the convex portion 2c on the plate body 2 side as shown in fig. 3, a surface for causing the plate body 2 to exist at a position closer to the inner hole 2d side than the ring 3 is necessarily formed in the radial direction of the inner hole 2d, and therefore the plate body 3 presses the ring 3 by its expansion, pressing the longitudinal joint portion between these two, and the gap is further less likely to occur.
It is preferable that a part or all of the surfaces in the longitudinal direction of each step portion 3a, 2a be parallel to the central axis B of the inner hole 2 d. In addition, in the fitting portion a (see fig. 2) formed by the convex portion 3B on the ring 3 side and the concave portion 2B on the plate body 2 side, a part or all of the fitting surface located on the inner hole 2d side in the longitudinal direction is preferably parallel to the central axis B of the inner hole 2 d. In the fitting portion a (see fig. 3) formed by the concave portion 3c on the ring 3 side and the convex portion 2c on the plate body 2 side, a part or all of the fitting surface on the outer peripheral side in the longitudinal direction is preferably parallel to the central axis B of the inner hole 2 d.
By making the structure of the fitting portion as described above, the action of the pressing ring 3 in the radial direction of the plate body 2 can be further improved, the compression action of the joint at these portions can be further improved, and the sealing property at these joint portions can be further secured.
In the present invention, the gas permeable portion of the ring 3 is made of a so-called porous refractory material having a function of introducing and discharging gas into and from the refractory structure itself, or a so-called dense refractory material having no function of introducing and discharging gas into and from the refractory structure itself, and a refractory material part having one or more through holes penetrating from the gas pool 4 on the outer peripheral side thereof to the inner hole 2d surface in the refractory structure can be produced.
Claims (3)
1. A foam sheet for a sliding nozzle used for continuous casting of steel, characterized in that,
A ring is arranged in the inner hole of the plate body, the ring is an annular part with ventilation function,
The ring has a first step portion or a first convex portion or a first concave portion on a lower end surface thereof,
A second step portion or a second recess portion or a second projection portion which can be fitted to the first step portion or the first projection portion or the first recess portion so as to face the lower end surface of the ring is provided on the upper surface of the plate body,
The length of the first step portion or the first convex portion or the first concave portion of the ring in the longitudinal direction of the fitting portion in which the first step portion or the second concave portion or the second convex portion of the plate body is fitted is 2mm or more, the longitudinal direction being the central axis direction of the inner hole,
Mortar is present at least at the longitudinal joint portion of the fitting portion,
The first step portion of the ring is formed such that an outer peripheral side of the ring protrudes downward from the inner hole of the ring, the second step portion of the plate body is formed such that the inner hole of the plate body protrudes upward from the outer peripheral side of the plate body, and a surface of a part or all of the longitudinal directions of the first step portion and the second step portion is parallel to a central axis of the inner hole,
In the fitting portion constituted by the first convex portion of the ring and the second concave portion of the plate body, a part or all of the longitudinal direction of the fitting surface located in the inner hole is parallel to a central axis of the inner hole,
In the fitting portion constituted by the first concave portion of the ring and the second convex portion of the plate body, a part or all of the longitudinal direction of a fitting surface located on an outer peripheral side is parallel to a central axis of the inner hole.
2. The foam board of claim 1, wherein the gas permeable portion of the ring is comprised of a porous refractory material.
3. The foam board of claim 1, wherein the gas permeable portion of the ring is a refractory part provided with one or more through holes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-001645 | 2020-01-08 | ||
| JP2020001645A JP7335170B2 (en) | 2020-01-08 | 2020-01-08 | Bubbling plate for sliding nozzle |
| PCT/JP2021/000068 WO2021141017A1 (en) | 2020-01-08 | 2021-01-05 | Bubbling plate for sliding nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114761155A CN114761155A (en) | 2022-07-15 |
| CN114761155B true CN114761155B (en) | 2024-05-10 |
Family
ID=76787933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180006512.7A Active CN114761155B (en) | 2020-01-08 | 2021-01-05 | Foaming plate for sliding nozzle |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230035070A1 (en) |
| JP (1) | JP7335170B2 (en) |
| CN (1) | CN114761155B (en) |
| TW (1) | TWI767504B (en) |
| WO (1) | WO2021141017A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1542950A (en) * | 1966-10-18 | 1968-10-18 | Metacon Ag | Casting device |
| JPH0524142U (en) * | 1991-09-05 | 1993-03-30 | 川崎炉材株式会社 | Sliding nozzle plate |
| JP2004268106A (en) * | 2003-03-10 | 2004-09-30 | Toshiba Ceramics Co Ltd | Gas leakage prevention structure of upper plate for gas blowing |
| CN101448590A (en) * | 2006-05-19 | 2009-06-03 | 黑崎播磨株式会社 | Upper nozzle-integrated plate and method of separating them |
| JP2010167477A (en) * | 2009-01-26 | 2010-08-05 | Tokyo Yogyo Co Ltd | Nozzle for molten steel storage vessel |
| JP2011088202A (en) * | 2009-10-26 | 2011-05-06 | Kurosaki Harima Corp | Joint structure of refractory |
| JP2016140906A (en) * | 2015-02-04 | 2016-08-08 | 黒崎播磨株式会社 | Hub ring plate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520860A (en) * | 1983-02-28 | 1985-06-04 | Manfred Haissig | Horizontal continuous casting apparatus |
| JPH0641962U (en) * | 1992-11-16 | 1994-06-03 | 品川白煉瓦株式会社 | Gas injection device in slide valve for discharging molten metal |
| EP2255904B1 (en) * | 2009-05-27 | 2014-11-26 | Calderys France | Refractory purging porous block assembly |
-
2020
- 2020-01-08 JP JP2020001645A patent/JP7335170B2/en active Active
-
2021
- 2021-01-05 WO PCT/JP2021/000068 patent/WO2021141017A1/en active Application Filing
- 2021-01-05 CN CN202180006512.7A patent/CN114761155B/en active Active
- 2021-01-05 US US17/791,425 patent/US20230035070A1/en active Pending
- 2021-01-07 TW TW110100575A patent/TWI767504B/en active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1542950A (en) * | 1966-10-18 | 1968-10-18 | Metacon Ag | Casting device |
| JPH0524142U (en) * | 1991-09-05 | 1993-03-30 | 川崎炉材株式会社 | Sliding nozzle plate |
| JP2004268106A (en) * | 2003-03-10 | 2004-09-30 | Toshiba Ceramics Co Ltd | Gas leakage prevention structure of upper plate for gas blowing |
| CN101448590A (en) * | 2006-05-19 | 2009-06-03 | 黑崎播磨株式会社 | Upper nozzle-integrated plate and method of separating them |
| JP2010167477A (en) * | 2009-01-26 | 2010-08-05 | Tokyo Yogyo Co Ltd | Nozzle for molten steel storage vessel |
| JP2011088202A (en) * | 2009-10-26 | 2011-05-06 | Kurosaki Harima Corp | Joint structure of refractory |
| JP2016140906A (en) * | 2015-02-04 | 2016-08-08 | 黒崎播磨株式会社 | Hub ring plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114761155A (en) | 2022-07-15 |
| JP2021109187A (en) | 2021-08-02 |
| JP7335170B2 (en) | 2023-08-29 |
| US20230035070A1 (en) | 2023-02-02 |
| TW202133969A (en) | 2021-09-16 |
| WO2021141017A1 (en) | 2021-07-15 |
| TWI767504B (en) | 2022-06-11 |
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