CN110695349B - CSP sheet billet continuous casting high-pulling-speed submerged nozzle and manufacturing method thereof - Google Patents
CSP sheet billet continuous casting high-pulling-speed submerged nozzle and manufacturing method thereof Download PDFInfo
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- CN110695349B CN110695349B CN201911151112.6A CN201911151112A CN110695349B CN 110695349 B CN110695349 B CN 110695349B CN 201911151112 A CN201911151112 A CN 201911151112A CN 110695349 B CN110695349 B CN 110695349B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 37
- 238000009826 distribution Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 11
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 10
- 239000005011 phenolic resin Substances 0.000 claims description 10
- 229920001568 phenolic resin Polymers 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 229910052596 spinel Inorganic materials 0.000 claims description 7
- 239000011029 spinel Substances 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000000462 isostatic pressing Methods 0.000 claims description 5
- 230000003064 anti-oxidating effect Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000006467 substitution reaction 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
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention relates to a CSP sheet billet continuous casting high-pulling-speed submerged nozzle and a manufacturing method thereof, wherein a nozzle body of the submerged nozzle is formed by sequentially connecting a molten steel inflow section with a bowl-shaped runner, an equal-diameter round channel section, a diversion channel section and an expansion outflow section from top to bottom, and a special diversion body is arranged in the diversion channel section; the expansion outflow section is a single-hole flow channel, and the horizontal cross section of the expansion outflow section is elliptical; the constant diameter round channel section is a cylindrical channel, and the inner diameter of the constant diameter round channel section is equal to the minimum inner diameter of the bowl opening of the molten steel inflow section and the inner diameter of the lower opening of the molten steel inflow section; the manufacturing method comprises the steps of raw material preparation, water gap forming (wherein the special split body is formed by adopting spinel-zirconium-carbon materials under high pressure in advance), sintering, water gap appearance processing, coating and packaging. The invention improves the structure and the size of the middle part and the lower part of the submerged nozzle, effectively improves the drawing speed and the steel passing amount of continuous casting, realizes stable production in a high drawing speed state under the condition of no electromagnetic braking equipment, and has high casting blank quality.
Description
Technical Field
The invention relates to the technical field of continuous casting and rolling, in particular to a CSP sheet billet continuous casting high-pulling-speed submerged nozzle and a manufacturing method thereof.
Background
Continuous casting and rolling of sheet billet is a brand new short-flow process technology for producing hot rolled coils, which is developed successfully in the last 80 th century. First, in 1989, the new yokou iron and steel company in indiana in the united states produced a CSP (Compact Strip Production) sheet bar continuous casting and rolling technology production line successfully developed by cimak (SMS), and later, more than 10 production lines were introduced in china, the casting width was about 900-1650 mm, and the casting thickness was generally 65-75 mm. Because the casting blank thickness is thinner, in order to apply the mold flux and the immersed gate to realize the protection pouring, the middle part of the mold adopts a funnel-shaped structure, the single side of the wide copper plate is outwards expanded on the basis of the thickness of the upper opening of the mold of 70-90 mm, namely, the opening degree is 55-60 mm, the maximum width of the funnel-shaped area is generally 880mm or so, the height is 850mm or so, and the total height of the mold is 1100mm.
In order to adapt to the special structure of narrow space of the inner cavity of the funnel-shaped crystallizer, the submerged nozzle for continuous casting of the sheet billet also adopts a relatively special shape structure, the height is generally about 1100mm, the whole nozzle is transited from the round shape at the upper part to the flat shape at the lower part, and meanwhile, the flow guide block is arranged at the lower part in the nozzle, so that the nozzle structure of the double-hole or triple-hole molten steel outlet is formed. However, when the existing submerged nozzle for sheet billet continuous casting is used, in the process of high-drawing-speed continuous casting, the molten steel is extremely easy to form a swinging flow field in a crystallizer to cause large fluctuation of the molten steel surface, thereby causing slag rolling and scrapping of steel billets due to inclusion; and the crack defect of the billet caused by uneven cooling can also be generated due to the poor gap between the inner wall of the crystallizer and the continuous casting shell caused by uneven temperature distribution of the molten steel surface of the crystallizer and uneven dissolution of the covering slag. The reason for the defects is that the submerged nozzle with the structure has the lower structural design, so that the continuous casting drawing speed is only about 4m/min, and the requirement of high-efficiency, high-quality and low-consumption of a sheet billet continuous casting and rolling production line cannot be met.
Disclosure of Invention
The invention provides a CSP sheet billet continuous casting high-pulling-speed submerged nozzle and a manufacturing method thereof, which effectively improve the pulling speed and steel passing quantity of continuous casting by improving the structures and the sizes of the middle part and the lower part of the submerged nozzle, realize stable production in a high-pulling-speed state without electromagnetic braking equipment and have high casting blank quality; the invention also provides a manufacturing method of the submerged nozzle.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises a nozzle body and a split body; the water gap body is formed by sequentially connecting a molten steel inflow section with a bowl-shaped runner, an equal-diameter round runner section, a diversion channel section and an expansion outflow section from top to bottom, and a diversion body is arranged in the diversion channel section; the expansion outflow section is a single-hole flow channel, and the horizontal cross section of the expansion outflow section is elliptical; the constant diameter round channel section is a cylindrical channel, and the inner diameter of the channel section is equal to the minimum inner diameter of the bowl opening of the molten steel inflow section and the inner diameter of the lower opening of the molten steel inflow section; the height of the equal-diameter round channel section is not more than one third of the total height of the nozzle body.
The circular section of the equal-diameter circular channel section is smoothly and smoothly gradually expanded and transited to the elliptical section of the expansion outflow section through the flow distribution channel section, and along the width direction, two endpoints of a long axis of the elliptical section of the flow distribution channel section are transited along the curve change of 500-1000 mm of curvature radius; in the thickness direction, the two end points of the short axis of the elliptic cross section of the flow distribution channel section are smoothly contracted, the cross section area of the lower opening of the flow distribution channel section is 1.8-2.5 times that of the upper opening of the flow distribution channel section, and the ratio of the height of the flow distribution channel section to the total height of the water gap body is 0.26-0.32.
The fluid is spinel-zirconium-carbon material fluid, and comprises the following components in percentage by mass: 70-75% of magnesiA-Alumina spinel, 20-25% of stabilized zirconia, 1-5% of crystalline flake graphite, 1-5% of magnesium-aluminum alloy powder and 3-8% of phenolic resin; wherein: the granularity composition of the magnesiA-Alumina spinel is 0.5-0mm, and the model of the stable zirconia is 325#; the model of the flake graphite is-199, and the model of the magnesium aluminum alloy powder is 200#; the phenolic resin is a liquid phenolic resin.
The width of the split fluid is 20-50 mm, and the height is 3-5 times of the width of the split fluid; the height of the split flow body is not more than that of the split flow channel section; the upper end part and the lower end part of the split fluid are arc-shaped, and the radius of the arc of the upper end part is larger than that of the arc of the lower end part; the vertical distance between the top point of the upper end part of the split flow body and the upper opening of the split flow channel section is 60-100 mm.
The height of the expansion outflow section is not less than one third of the height of the nozzle body; the horizontal cross section of the expansion outflow section is always kept to be elliptical, the length of the long shaft is gradually and linearly expanded and increased from top to bottom, the length of the long shaft of the upper opening of the expansion outflow section is 125% -145% of the length of the long shaft of the lower opening of the expansion outflow section, and the length of the short shaft is kept unchanged from top to bottom.
The length of the long axis of the elliptical cross section of the upper opening of the expansion outflow section is 260-300 mm, the length of the long axis of the elliptical cross section of the lower opening of the expansion outflow section is 325-405 mm, and the length of the short axis of the elliptical cross section of the expansion outflow section is 40-60 mm.
The lower part of the water gap body is provided with a slag line area, the slag line area is inlaid in the expansion outflow section, the outer surface of the slag line area is flush with the outer surface of the expansion outflow section, the bottom of the slag line area is 70-80 mm away from the edge of the lower opening of the expansion outflow section, the wall thickness of the slag line area is not less than 26mm, and the height of the slag line area is 280-320 mm; the wall thickness of the nozzle body is gradually reduced to 16-20 mm from the lower edge of the slag line area to the lower opening of the expansion outflow section.
A manufacturing method of a CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises the following steps:
1) Preparing raw materials: weighing raw materials of the water gap body, the split flow body and the slag line area for standby according to the weight part ratio, uniformly mixing the raw materials by a high-speed mixer, and drying for standby;
2) And (3) forming: the prepared raw materials are respectively assembled to the corresponding parts of a water gap mould, wherein the split raw materials are firstly placed into the split mould to be preformed under high pressure by an isostatic pressing device, the forming pressure is 110-120 MPa, and then the split components which are preformed under high pressure are assembled into the water gap mould to be finally formed together with the raw materials of other parts;
3) Firing: the formed immersed nozzle is sintered in reducing atmosphere at 1100-1200 deg.c for over 5 hr;
4) And (3) appearance processing: carrying out contour turning on the baked immersed nozzle according to the drawing requirements;
5) Coating: the inner wall and the outer wall of the immersed nozzle after mechanical processing are coated with an anti-oxidation coating, thus obtaining a final finished product;
6) And (3) packaging: and packaging the qualified finished product after inspection.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, a nozzle body is divided into a molten steel inflow section with a bowl-shaped runner from top to bottom, an equal-diameter round runner section at the upper part, a diversion runner section at the middle part and an expansion outflow section of a single-hole expansion runner at the lower part, a special diversion body is arranged in the diversion runner section at the middle part, the single-hole expansion runner with a single-hole special elliptic cross section shape is arranged in the expansion outflow section at the lower part, and when CSP sheet blanks are continuously cast at high pulling speed, after molten steel flows into a submerged nozzle, reasonable swirling flow is formed in a crystallizer due to the diversion effect of the diversion body, the turbulent kinetic energy dissipation effect of the diversion body and the expansion and deceleration effect of the outflow section at the lower part; meanwhile, the structure of the expanding outflow section with the elliptical cross section is more suitable for the shape of the inner cavity of the funnel-shaped crystallizer, so that the flow speed of molten steel of the crystallizer around the immersed nozzle is reasonably controlled, swirling slag is eliminated, the fluctuation range of the liquid level of the steel of the crystallizer is controlled in a more reasonable range, the temperature on the liquid level of the steel of the crystallizer is higher, the mold flux is melted and the liquid slag layer is distributed more uniformly, and the production of high-quality continuous casting blanks is facilitated;
2) In the manufacturing process of the immersed nozzle, a method that the split flow body is preformed under high pressure and then assembled into a nozzle die to finish final forming of the nozzle is adopted, so that the connection strength of the split flow body and the nozzle body and the erosion and corrosion resistance are ensured;
3) The submerged nozzle can improve the pulling speed of CSP sheet billet continuous casting to more than 5.5 meters/min under the conditions of no new equipment and no electromagnetic braking, thereby greatly improving the production efficiency;
4) The submerged nozzle has a simple structure, is convenient to use, and is suitable for popularization and use in CSP sheet billet continuous casting.
Drawings
Fig. 1 is a schematic view of a vertical sectional structure of a submerged nozzle according to the present invention in a width direction.
Fig. 2 is a schematic view of a vertical cross-section of the submerged nozzle according to the present invention in the thickness direction.
Fig. 3 is a schematic view of section A-A in fig. 2.
Fig. 4 is a schematic view of section B-B in fig. 2.
Fig. 5 is a schematic view of section C-C of fig. 2.
In the figure: 1. the nozzle body 11, the molten steel inflow section 12, the equal diameter round channel section 13, the diversion channel section 14, the expansion outflow section 2, the diversion body 3 and the slag line area
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1 to 5, the CSP thin slab continuous casting high-drawing-speed submerged nozzle of the present invention comprises a nozzle body 1 and a split body 2; the water gap body 1 is formed by sequentially connecting a molten steel inflow section 11 with a bowl-shaped runner, an equal-diameter round channel section 12, a diversion channel section 13 and an expansion outflow section 14 from top to bottom, and the diversion body 2 is arranged in the diversion channel section 13; the expansion outflow section 14 is a single-hole runner, and the horizontal cross section of the expansion outflow section is elliptical; the constant diameter round channel section 12 is a cylindrical channel, and the inner diameter of the channel is equal to the minimum inner diameter of the bowl opening of the molten steel inflow section 11 and the inner diameter of the lower opening of the molten steel inflow section 11; the height of the equal diameter circular channel section 12 is not more than one third of the total height of the nozzle body 1.
The circular section of the equal-diameter circular channel section 12 is smoothly and smoothly gradually expanded and transited to the elliptical section of the expanded outflow section 14 through the diversion channel section 13, and along the width direction, two end points of the long axis of the elliptical section of the diversion channel section 13 are transited along the curve change of 500-1000 mm of curvature radius; in the thickness direction, the two end points of the short axis of the elliptic cross section of the diversion channel section 13 are smoothly contracted gradually, the cross section area of the lower opening of the diversion channel section 13 is 1.8-2.5 times of the cross section area of the upper opening of the diversion channel section 13, and the ratio of the height of the diversion channel section 13 to the total height of the water gap body 1 is 0.26-0.32.
The width of the shunt body 2 is 20-50 mm, and the height is 3-5 times of the width of the shunt body; and the height of the shunt body 2 does not exceed the height of the shunt channel section 13; the upper end part and the lower end part of the split body 2 are arc-shaped, and the radius of the arc of the upper end part is larger than that of the arc of the lower end part; the vertical distance between the top point of the upper end part of the split flow body 2 and the upper opening of the split flow channel section 13 is 60-100 mm.
The shunt body 2 is a spinel-zirconium-carbon material shunt body, and comprises the following components in percentage by mass: 70-75% of magnesiA-Alumina spinel, 20-25% of stabilized zirconia, 1-5% of crystalline flake graphite, 1-5% of magnesium-aluminum alloy powder and 3-8% of phenolic resin; wherein: the granularity composition of the magnesiA-Alumina spinel is 0.5-0mm, and the model of the stable zirconia is 325#; the model of the flake graphite is-199, and the model of the magnesium aluminum alloy powder is 200#; the phenolic resin is a liquid phenolic resin.
The height of the expansion outflow section 14 is not less than one third of the height of the nozzle body 1; the horizontal cross section of the expansion outflow section 14 is always kept elliptical, the length of the long axis is gradually and linearly expanded from top to bottom, the length of the long axis of the upper opening of the expansion outflow section 14 is 125% -145% of the length of the long axis of the lower opening of the expansion outflow section 14, and the length of the short axis is kept unchanged from top to bottom.
The length of the major axis of the elliptical cross section of the upper opening of the expansion outflow section 14 is 260-300 mm, the length of the major axis of the elliptical cross section of the lower opening of the expansion outflow section 14 is 325-405 mm, and the length of the minor axis of the elliptical cross section of the expansion outflow section 14 is 40-60 mm.
The lower part of the water gap body 1 is provided with a slag line area 3, the slag line area 3 is embedded in the expansion outflow section 14, the outer surface of the slag line area 3 is flush with the outer surface of the expansion outflow section 14, the bottom of the slag line area 3 is 70-80 mm away from the edge of the lower opening of the expansion outflow section 14, the wall thickness of the slag line area 3 is not less than 26mm, and the height of the slag line area 3 is 280-320 mm; the wall thickness of the water gap body 1 is gradually reduced to 16-20 mm from the lower edge of the slag line area 3 to the lower opening of the expansion outflow section 14.
A manufacturing method of a CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises the following steps:
1) Preparing raw materials: weighing raw materials of the water gap body 1, the split flow body 2 and the slag line area 3 for standby according to the weight part ratio, uniformly mixing the raw materials by a high-speed mixer, and drying for standby;
2) And (3) forming: the prepared raw materials are respectively assembled to the corresponding parts of a water gap mould, wherein the split raw materials are firstly placed into the split mould to be preformed under high pressure by an isostatic pressing device, the forming pressure is 110-120 MPa, and then the split components which are preformed under high pressure are assembled into the water gap mould to be finally formed together with the raw materials of other parts;
3) Firing: the formed immersed nozzle is sintered in reducing atmosphere at 1100-1200 deg.c for over 5 hr;
4) And (3) appearance processing: carrying out contour turning on the baked immersed nozzle according to the drawing requirements;
5) Coating: the inner wall and the outer wall of the immersed nozzle after mechanical processing are coated with an anti-oxidation coating, thus obtaining a final finished product;
6) And (3) packaging: and packaging the qualified finished product after inspection.
The immersed nozzle changes the conventional nozzle lower structure of the immersed nozzle for the sheet billet continuous casting crystallizer, which adopts two-hole, three-hole and four-hole steel water outlets, by arranging the split flow body 2 with special shape and material in the split flow channel section 13 and arranging the expansion outflow section 14 as a single Kong Xinggang water channel with a special elliptic section shape, so that the immersed nozzle can form a more reasonable molten steel flow field when the immersed nozzle is used in the CSP sheet billet continuous casting crystallizer, and the molten steel flows out from the immersed nozzle to the liquid level of the crystallizer at a small and stable speed, the meniscus temperature is higher and the temperature field distribution is uniform. Thereby realizing the technological requirements of the CSP sheet billet continuous casting machine for stably producing high-quality casting billets in a high-pulling-speed (more than 5.5 m/min) state without electromagnetic braking, greatly improving the production efficiency and economic benefit and being suitable for popularization and use.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
[ example ]
As shown in fig. 1 to 5, in this embodiment, a submerged nozzle for CSP sheet bar continuous casting includes a nozzle body 1 and a split body 2, wherein the nozzle body 1 is formed by sequentially connecting a molten steel inflow section 11 at the top, a constant diameter round channel section 12 at the upper part, a split channel section 13 at the middle part, and an expansion outflow section 14 at the lower part, a split body 2 is disposed in the split channel section 13 at the middle part, and the internal channel horizontal cross section of the expansion outflow section 14 at the lower part is elliptical.
The molten steel outflow hole of the expansion outflow section 14 is a single-channel outflow hole, so that the two-hole, three-hole and four-hole water gap structures which are conventionally adopted by the immersed water gap for the CSP sheet billet continuous casting crystallizer at present are changed, and more reasonable molten steel flow fields and temperature fields which are characterized by two symmetrical main swirling flows can be formed when the immersed water gap is used in the CSP sheet billet continuous casting crystallizer.
In this embodiment, the specific structural dimensions of the submerged nozzle are as follows:
the wall thickness of the nozzle body 1 is 35mm, and the total height is 1100mm.
The molten steel inflow section 11 of the submerged nozzle has the same bowl-like structure as the conventional submerged nozzle and has a height of 150mm, so that it can be ensured that the structural dimensions of the relevant components in the continuous casting tundish of the steel mill do not need to be redesigned and modified.
The inner diameter of the equal-diameter round channel section 12 at the upper part of the submerged nozzle is identical with the minimum inner diameter of the lower opening and the bowl opening of the molten steel inflow section 11, and is 80mm, the outer diameter is 150mm, and the height of the equal-diameter round channel section 12 is 290mm.
The upper opening of the diversion channel section 13 is connected with the lower opening of the equal-diameter round channel section 12, the lower opening of the diversion channel section 13 is connected with the upper opening of the expansion outflow section 14, the internal channel of the diversion channel section 13 smoothly and smoothly gradually expands and transits from the round section of the inlet to the oval section of the inlet of the expansion outflow section 14, the cross section area of the lower opening is 2 times of the cross section area of the upper opening, and the height is 290mm.
The width of the split flow body 2 arranged in the split flow channel section 13 is 40mm, and the height thereof is 130mm; the upper end part and the lower end part of the split body 2 are arc-shaped, the radius of the arc of the upper end part is 20mm, and the radius of the arc of the lower end part is 12.5mm; the vertical distance between the top of the upper end of the shunt body 2 and the inlet of the shunt channel section 13 is 80mm.
The height of the expansion outflow section 14 is 370mm; the horizontal cross section of the internal passage is always kept to be elliptical, the cross section area is continuously and linearly enlarged and changed from the upper opening to the lower opening, in the embodiment, the length of the major axis of the elliptical cross section is continuously changed from 270mm to 272mm, and the length of the minor axis of the elliptical cross section is 50mm.
In this embodiment, the slag line area 3 in the nozzle body 1 is inlaid in the lower expansion outflow section 14, the outer surface of the slag line area 3 is flush with the outer surface of the expansion outflow section 14, the distance from the lower edge of the slag line area 3 to the lower edge of the expansion outflow section 14 is 70mm, the wall thickness of the slag line area 3 is 26mm, the height of the slag line area 3 is 290mm, and the wall thickness of the nozzle body 1 is gradually reduced to 18mm from the lower edge of the slag line area 3 to the lower edge of the expansion outflow section 14.
In this embodiment, the method for manufacturing the submerged nozzle is as follows:
1) Preparing ingredients: weighing raw materials of the water gap body 1, the split flow body 2 and the slag line area 3 for standby according to the weight part ratio, uniformly mixing the raw materials by a high-speed mixer, and drying for standby; wherein the component fluid 2 adopts spinel-zirconium-carbon material, and comprises the following components in percentage by mass: 71% of magnesiA-Alumina spinel (0.5-0 mm), 22% of stabilized zirconia (325#), 1.5% of crystalline flake graphite (-199), 1.5% of magnesium-aluminum alloy powder (200#) and 4% of phenolic resin (liquid);
2) And (3) forming: firstly, putting the raw materials of the split body 2 into a split body special mould, and carrying out high-pressure pre-forming in an isostatic pressing device, wherein the forming pressure is 190MPa; then assembling the pre-formed special split body 2 into a die of the nozzle body 1, filling other raw materials and raw materials of the slag line area 3 into the die of the nozzle body 1, and finally carrying out final forming together by an isostatic pressing device under 120 MPa;
3) Firing: the formed immersed nozzle is sintered in reducing atmosphere at 1150 ℃ for 6 hours;
4) And (3) appearance processing: carrying out contour turning on the baked immersed nozzle according to the drawing requirements;
5) Coating: the inner wall and the outer wall of the immersed nozzle after mechanical processing are coated with an anti-oxidation coating, thus obtaining a final finished product;
6) And (3) packaging: and packaging the qualified finished product after inspection. The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. A CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises a nozzle body and a split body; the water gap is characterized in that the water gap body is formed by sequentially connecting a molten steel inflow section with a bowl-shaped runner, an equal-diameter round channel section, a diversion channel section and an expansion outflow section from top to bottom, and a diversion body is arranged in the diversion channel section; the expansion outflow section is a single-hole flow channel, and the horizontal cross section of the expansion outflow section is elliptical; the constant diameter round channel section is a cylindrical channel, and the inner diameter of the channel section is equal to the minimum inner diameter of the bowl opening of the molten steel inflow section and the inner diameter of the lower opening of the molten steel inflow section; the height of the equal-diameter round channel section is not more than one third of the total height of the nozzle body;
the width of the split fluid is 20-50 mm, and the height is 3-5 times of the width of the split fluid; the height of the split flow body is not more than that of the split flow channel section; the upper end part and the lower end part of the split fluid are arc-shaped, and the radius of the arc of the upper end part is larger than that of the arc of the lower end part; the vertical distance between the top point of the upper end part of the split flow body and the upper opening of the split flow channel section is 60-100 mm;
the fluid is spinel-zirconium-carbon material fluid, and comprises the following components in percentage by mass: 70-75% of magnesiA-Alumina spinel, 20-25% of stabilized zirconia, 1-5% of crystalline flake graphite, 1-5% of magnesium-aluminum alloy powder and 3-8% of phenolic resin; wherein: the granularity composition of the magnesiA-Alumina spinel is 0.5-0mm, and the model of the stable zirconia is 325#; the model of the flake graphite is-199, and the model of the magnesium aluminum alloy powder is 200#; the phenolic resin is liquid phenolic resin;
the circular section of the equal-diameter circular channel section is smoothly and smoothly gradually expanded and transited to the elliptical section of the expansion outflow section through the flow distribution channel section, and along the width direction, two endpoints of a long axis of the elliptical section of the flow distribution channel section are transited along the curve change of 500-1000 mm of curvature radius; in the thickness direction, the two end points of the short axis of the elliptic cross section of the flow distribution channel section are smoothly contracted gradually, the cross section area of the lower opening of the flow distribution channel section is 1.8-2.5 times that of the upper opening of the flow distribution channel section, and the ratio of the height of the flow distribution channel section to the total height of the water gap body is 0.26-0.32;
the height of the expansion outflow section is not less than one third of the height of the nozzle body; the horizontal cross section of the expansion outflow section is always kept elliptical, the length of the long shaft is gradually and linearly expanded and increased from top to bottom, the length of the long shaft of the upper opening of the expansion outflow section is 125% -145% of the length of the long shaft of the lower opening of the expansion outflow section, and the length of the short shaft is kept unchanged from top to bottom;
the length of the long axis of the elliptical cross section of the upper opening of the expansion outflow section is 260-300 mm, the length of the long axis of the elliptical cross section of the lower opening of the expansion outflow section is 325-405 mm, and the length of the short axis of the elliptical cross section of the expansion outflow section is 40-60 mm;
the lower part of the water gap body is provided with a slag line area, the slag line area is inlaid in the expansion outflow section, the outer surface of the slag line area is flush with the outer surface of the expansion outflow section, the bottom of the slag line area is 70-80 mm away from the edge of the lower opening of the expansion outflow section, the wall thickness of the slag line area is not less than 26mm, and the height of the slag line area is 280-320 mm; the wall thickness of the nozzle body is gradually reduced to 16-20 mm from the lower edge of the slag line area to the lower opening of the expansion outflow section.
2. A method of manufacturing a CSP thin slab continuous casting high drawing speed submerged nozzle as claimed in claim 1, comprising the steps of:
1) Preparing raw materials: weighing raw materials of the water gap body, the split flow body and the slag line area for standby according to the weight part ratio, uniformly mixing the raw materials by a high-speed mixer, and drying for standby;
2) And (3) forming: the prepared raw materials are respectively assembled to the corresponding parts of a water gap mould, wherein the split raw materials are firstly placed into the split mould to be preformed under high pressure by an isostatic pressing device, the forming pressure is 110-120 MPa, and then the split components which are preformed under high pressure are assembled into the water gap mould to be finally formed together with the raw materials of other parts;
3) Firing: the formed immersed nozzle is sintered in reducing atmosphere at 1100-1200 deg.c for over 5 hr;
4) And (3) appearance processing: carrying out contour turning on the baked immersed nozzle according to the drawing requirements;
5) Coating: the inner wall and the outer wall of the immersed nozzle after mechanical processing are coated with an anti-oxidation coating, thus obtaining a final finished product;
6) And (3) packaging: and packaging the qualified finished product after inspection.
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| WO2022219956A1 (en) * | 2021-04-15 | 2022-10-20 | 品川リフラクトリーズ株式会社 | Immersion nozzle for continuous casting |
| CN114749650A (en) * | 2022-05-08 | 2022-07-15 | 新疆八一钢铁股份有限公司 | Parabolic long-life continuous casting immersion nozzle |
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