CN110695349A - CSP thin slab continuous casting high-pulling-speed submerged nozzle and manufacturing method thereof - Google Patents
CSP thin slab continuous casting high-pulling-speed submerged nozzle and manufacturing method thereof Download PDFInfo
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- CN110695349A CN110695349A CN201911151112.6A CN201911151112A CN110695349A CN 110695349 A CN110695349 A CN 110695349A CN 201911151112 A CN201911151112 A CN 201911151112A CN 110695349 A CN110695349 A CN 110695349A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 16
- 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 5
- 239000002893 slag Substances 0.000 claims description 38
- 238000009826 distribution Methods 0.000 claims description 22
- 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
- 239000000843 powder 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
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 238000007654 immersion Methods 0.000 claims description 7
- 229910052596 spinel Inorganic materials 0.000 claims description 7
- 239000011029 spinel Substances 0.000 claims description 7
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000465 moulding Methods 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
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- -1 magnesium aluminate Chemical class 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000003575 carbonaceous material Substances 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 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
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—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
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 flow channel, an equal-diameter circular channel section, a diversion channel section and an expansion outflow section from top to bottom, and a specially-made diversion body is arranged in the diversion channel section; the expansion outflow section is a single-hole type flow channel, and the horizontal cross section of the expansion outflow section is oval; the equal-diameter circular channel section is a cylindrical channel, and the inner diameter of the equal-diameter circular channel section is equal to the minimum inner diameter of a bowl opening of the molten steel inflow section and the inner diameter of a lower opening of the molten steel inflow section; the manufacturing method comprises the steps of raw material preparation, water gap forming (wherein the special shunting body is formed by spinel-zirconium-carbon material in advance at high pressure), sintering, water gap shape processing, coating and packaging. The invention effectively improves the drawing speed and the steel passing amount of continuous casting by improving the structure and the size of the middle part and the lower part of the submerged nozzle, realizes stable production under the condition of no electromagnetic braking equipment and ensures that the casting blank has high 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-casting-speed submerged nozzle and a manufacturing method thereof.
Background
The continuous casting and rolling of thin slab is a new short process technology for producing hot rolled coil, which is developed successfully in the end of 80 s in the 20 th century. First, a CSP (compact Strip production) thin slab continuous casting and rolling technology production line developed successfully by Simmark corporation (SMS) was produced by Niuchi iron and Steel company of Indiana in 1989, and later 10 production lines were introduced in China, wherein the width of a cast slab is about 900-1650 mm, and the thickness of the cast slab is generally 65-75 mm. Because the thickness of a casting blank is thinner, in order to realize protective pouring by using crystallizer covering slag and a submerged nozzle, the middle part of the crystallizer adopts a funnel-shaped structure, on the basis of 70-90 mm of the thickness of an upper opening of the crystallizer, a wide-surface copper plate is expanded outwards on one side, namely the opening degree is 55-60 mm, the maximum width of a funnel-shaped area is about 880mm generally, the height is about 850mm, and the total height of the crystallizer is 1100 mm.
In order to adapt to the special structure with narrow cavity space in the funnel-shaped crystallizer, the submerged nozzle for continuous casting of the sheet billet also adopts a relatively special shape structure, the height is about 1100mm generally, the whole nozzle is transited from a round shape at the upper part to a flat shape at the lower part, and meanwhile, the lower part in the nozzle is provided with a flow guide block, so that the nozzle structure of a double-hole or three-hole molten steel outlet is formed. However, when the conventional submerged nozzle for continuous casting of sheet billets is used, in the process of high-casting speed continuous casting, the molten steel easily forms a swinging flow field in the crystallizer to cause large fluctuation of the molten steel surface, thereby causing slag entrapment and causing scrap of steel billets due to inclusion; but also the steel billet has crack defects caused by uneven cooling because the temperature of the molten steel surface of the crystallizer is not uniformly distributed and the casting powder is not uniformly dissolved to cause poor clearance between the inner wall of the crystallizer and the continuous casting billet shell. The reason for the defects is that the submerged nozzle with the structure only achieves the continuous casting drawing speed of about 4m/min due to the structural design of the middle lower part, and the requirements of high efficiency, high quality and low consumption of a thin slab continuous casting and rolling production line cannot be met.
Disclosure of Invention
The invention provides a CSP thin slab continuous casting high-pulling-speed submerged nozzle and a manufacturing method thereof, which effectively improve the pulling speed and steel passing amount of continuous casting by improving the structure and the size of the middle part and the lower part of the submerged nozzle, realize stable production in a high-pulling-speed state under the condition of no electromagnetic braking equipment and ensure that the casting blank has high quality; the invention also provides a manufacturing method of the submerged nozzle.
In order to achieve the purpose, the invention adopts the following technical scheme:
a CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises a nozzle body and a splitter; the water gap body is formed by sequentially connecting a molten steel inflow section with a bowl-mouth-shaped flow channel, an equal-diameter circular 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 type flow channel, and the horizontal cross section of the expansion outflow section is oval; the equal-diameter circular channel section is a cylindrical channel, and the inner diameter of the equal-diameter circular channel section is equal to the minimum inner diameter of a bowl opening of the molten steel inflow section and the inner diameter of a lower opening of the molten steel inflow section; the height of the equal-diameter circular channel section is not more than one third of the total height of the water gap body.
The circular section of the equal-diameter circular channel section is smoothly and gradually expanded and transited to the elliptic section of the expanded outflow section through the flow distribution channel section, and two end points of the long axis of the elliptic cross section of the flow distribution channel section are changed and transited along a curve with the curvature radius of 500-1000 mm along the width direction; in the thickness direction, two end points of a short shaft of the elliptic cross section of the flow distribution channel section smoothly and gradually contract, the cross section area of a lower opening of the flow distribution channel section is 1.8-2.5 times of that of an 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 shunt is a spinel-zirconium-carbon material shunt, and comprises the following components in percentage by mass: 70-75% of magnesium aluminate 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 particle size composition of the magnesia-alumina spinel is 0.5-0mm, and the model of the stabilized zirconia is No. 325; the model of the crystalline 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 shunt body is 20-50 mm, and the height of the shunt body is 3-5 times of the width of the shunt body; and the height of the shunting body does not exceed the height of the shunting channel section; the upper end part and the lower end part of the shunt body are both 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 of the shunting body and the upper opening of the shunting channel section is 60-100 mm.
The height of the expansion outflow section is not less than one third of the height of the water gap body; the horizontal cross section of the expansion outflow section is always kept in an oval shape, the length of the long axis is gradually expanded and increased linearly from top to bottom, the length of the long axis of the upper opening of the expansion outflow section is 125% -145% of the length of the long axis of the lower opening of the expansion outflow section, and the length of the short axis is kept unchanged from top to bottom.
The length of the major axis of the oval cross section of the upper opening of the expanding outflow section is 260-300 mm, the length of the major axis of the oval cross section of the lower opening of the expanding outflow section is 325-405 mm, and the length of the minor axis of the oval cross section of the expanding 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 embedded 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 distance between the bottom of the slag line area and the lower opening edge of the expansion outflow section is 70-80 mm, 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; from the lower edge of slag line district to the expansion outflow section end opening, the wall thickness of mouth of a river body thins to 16 ~ 20mm gradually.
A manufacturing method of a CSP thin slab continuous casting high-pulling-speed submerged nozzle comprises the following steps:
1) preparing raw materials: weighing raw materials of the nozzle body, the split fluid and the slag line area according to the weight part ratio for later use, then uniformly mixing the raw materials through a high-speed mixer respectively, and drying the raw materials for later use;
2) molding: respectively assembling various prepared raw materials to corresponding parts of a nozzle mould, wherein the split-flow body raw materials are firstly placed into the split-flow body mould for high-pressure preforming through an isostatic pressing device, the forming pressure is 110-120 MPa, then the split-flow body part subjected to high-pressure preforming is assembled into the nozzle mould, and the split-flow body part is finally formed along with the raw materials of other parts;
3) and (3) firing: firing the formed submerged nozzle at 1100-1200 ℃ for more than 5 hours in a reducing atmosphere;
4) and (3) processing the appearance: carrying out appearance turning on the fired submerged nozzle according to the requirement of a drawing;
5) coating: coating anti-oxidation paint on the inner wall and the outer wall of the mechanically processed immersion water port to obtain a final finished product;
6) packaging: and packaging the finished product after the finished product is qualified.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention divides the nozzle body into a molten steel inflow section with a bowl-shaped runner, an equal-diameter circular channel section at the upper part, a shunt channel section at the middle part and an expansion outflow section of a single-hole type expansion runner at the lower part from top to bottom, a specially-made shunt body is arranged in the shunt channel section at the middle part, and the single-hole type expansion runner with a specific elliptical cross section shape at the lower part is arranged in the expansion outflow section; meanwhile, the structure of the expansion outflow section with the oval cross section is more suitable for the shape of the inner cavity of the funnel-shaped crystallizer, so that the flow velocity of molten steel of the crystallizer around the submerged nozzle is reasonably controlled, vortex slag entrapment is eliminated, the fluctuation range of the molten steel level of the crystallizer is controlled in a more reasonable range, the temperature of the molten steel level of the crystallizer is higher, the protective slag of the crystallizer is melted, and the liquid slag layer is more uniformly distributed, thereby being beneficial to producing high-quality continuous casting billets;
2) in the manufacturing process of the submerged nozzle, a method that the shunting body is preformed under high pressure and then assembled into a nozzle mold to finish final molding of the nozzle is adopted, so that the connection strength and the erosion resistance and corrosion resistance of the shunting body and the nozzle body are ensured;
3) the submerged nozzle can improve the casting speed of CSP sheet billet continuous casting to more than 5.5 m/min under the conditions of no addition of new equipment and no electromagnetic braking, thereby greatly improving the production efficiency;
4) the submerged nozzle has the advantages of simple structure and convenient use, and is suitable for popularization and application in CSP thin slab continuous casting.
Drawings
Fig. 1 is a schematic view showing a vertical cross-sectional structure of a submerged entry nozzle according to the present invention in a width direction.
Fig. 2 is a schematic view showing a vertical cross-sectional structure of a submerged entry nozzle of the present invention in a thickness direction.
Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.
Fig. 4 is a schematic sectional view B-B in fig. 2.
Fig. 5 is a schematic cross-sectional view of C-C in fig. 2.
In the figure: 1. a nozzle body 11, a molten steel inflow section 12, an equal diameter circular channel section 13, a diversion channel section 14, an expansion outflow section 2, a diversion body 3 and a slag line area
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1-5, the CSP thin slab continuous casting high casting speed submerged nozzle of the present invention includes a nozzle body 1 and a splitter 2; the water gap body 1 is formed by sequentially connecting a molten steel inflow section 11 with a bowl-shaped flow channel, an equal-diameter circular 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 type flow channel, and the horizontal cross section of the expansion outflow section is oval; the equal-diameter circular passage section 12 is a cylindrical passage, and the inner diameter of the equal-diameter circular passage section 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 cross section of the equal-diameter circular channel section 12 is smoothly and smoothly gradually expanded and transited to the oval cross section of the expanded outflow section 14 through the flow distribution channel section 13, and along the width direction, two end points of the long axis of the oval cross section of the flow distribution channel section 13 are changed and transited along a curve with the curvature radius of 500-1000 mm; in the thickness direction, two end points of the short axis of the elliptic cross section of the flow dividing channel section 13 smoothly and gradually contract, the cross section area of the lower opening of the flow dividing channel section 13 is 1.8 to 2.5 times of the cross section area of the upper opening of the flow dividing channel section 13, and the ratio of the height of the flow dividing channel section 13 to the total height of the nozzle body 1 is 0.26 to 0.32.
The width of the shunting body 2 is 20-50 mm, and the height is 3-5 times of the width of the shunting body; and the height of the flow distribution body 2 does not exceed the height of the flow distribution channel section 13; the upper end part and the lower end part of the shunting body 2 are both 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 of the shunting body 2 and the upper opening of the shunting channel section 13 is 60-100 mm.
The shunt 2 is a spinel-zirconium-carbon material shunt, and comprises the following components in percentage by mass: 70-75% of magnesium aluminate 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 particle size composition of the magnesia-alumina spinel is 0.5-0mm, and the model of the stabilized zirconia is No. 325; the model of the crystalline 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 expanding outflow section 14 is always kept in an oval shape, the length of the long axis is gradually expanded and increased linearly from top to bottom, the length of the long axis of the upper opening of the expanding outflow section 14 is 125% -145% of the length of the long axis of the lower opening of the expanding 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 oval cross section of the upper opening of the expansion outflow section 14 is 260-300 mm, the length of the major axis of the oval 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 oval 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 distance between the bottom of the slag line area 3 and the lower opening edge of the expansion outflow section 14 is 70-80 mm, 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; from the lower edge of the slag line area 3 to the lower opening of the expansion outflow section 14, the wall thickness of the water gap body 1 is gradually thinned to 16-20 mm.
A manufacturing method of a CSP thin slab continuous casting high-pulling-speed submerged nozzle comprises the following steps:
1) preparing raw materials: weighing raw materials of the nozzle body 1, the shunting body 2 and the slag line area 3 according to the weight part ratio for later use, then respectively and uniformly mixing the raw materials through a high-speed mixer, and drying the raw materials for later use;
2) molding: respectively assembling various prepared raw materials to corresponding parts of a nozzle mould, wherein the split-flow body raw materials are firstly placed into the split-flow body mould for high-pressure preforming through an isostatic pressing device, the forming pressure is 110-120 MPa, then the split-flow body part subjected to high-pressure preforming is assembled into the nozzle mould, and the split-flow body part is finally formed along with the raw materials of other parts;
3) and (3) firing: firing the formed submerged nozzle at 1100-1200 ℃ for more than 5 hours in a reducing atmosphere;
4) and (3) processing the appearance: carrying out appearance turning on the fired submerged nozzle according to the requirement of a drawing;
5) coating: coating anti-oxidation paint on the inner wall and the outer wall of the mechanically processed immersion water port to obtain a final finished product;
6) packaging: and packaging the finished product after the finished product is qualified.
The submerged nozzle of the invention changes the conventional nozzle lower part structure of the submerged nozzle for the prior sheet billet continuous casting crystallizer, which adopts two-hole, three-hole and four-hole molten steel outlets, by arranging the flow distribution body 2 with special shape and material in the flow distribution channel section 13 and arranging the expanding outflow section 14 as the single-hole molten steel channel with specific elliptic section shape, so that the submerged nozzle can form a more reasonable molten steel flow field when used in the CSP sheet billet continuous casting crystallizer, and the molten steel has small and stable speed when flowing out from the submerged nozzle to reach the liquid surface of the crystallizer, higher meniscus temperature and uniform temperature field distribution. Therefore, the CSP thin slab continuous casting machine can stably produce high-quality casting blanks under the condition of high drawing speed (more than 5.5 m/min) and without electromagnetic braking, greatly improves the production efficiency and economic benefit, and is suitable for popularization and use.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
As shown in fig. 1 to 5, in the present embodiment, a submerged nozzle for CSP thin slab continuous casting includes a nozzle body 1 and a splitter 2, the nozzle body 1 is formed by connecting a top molten steel inflow section 11, an upper equal diameter circular channel section 12, a middle splitter channel section 13, and a lower expanding outflow section 14 in sequence, the splitter 2 is provided in the middle splitter channel section 13, and the horizontal cross-section of the inner channel of the lower expanding outflow section 14 is elliptical.
The molten steel outflow hole of the expanding outflow section 14 is a single-channel outflow hole, and the structure of a two-hole, three-hole and four-hole type water gap which is conventionally adopted by the immersion type water gap for the prior CSP thin slab continuous casting crystallizer is changed, so that the immersion type water gap can form a more reasonable molten steel flow field and a more reasonable temperature field which are characterized by two symmetrical main swirling flows when the immersion type water gap is used in the CSP thin slab continuous casting crystallizer.
In this embodiment, the submerged nozzle has the following specific structural dimensions:
the wall thickness of the nozzle body 1 is 35mm, and the total height is 1100 mm.
The molten steel inflow section 11 of the submerged entry nozzle has the same bowl structure as that of the conventional submerged entry nozzle and has a height of 150mm, so that it is ensured that the structural dimensions of the relevant components in the continuous casting tundish of a steel mill do not need to be redesigned and modified.
The inner diameter of the equal-diameter circular channel section 12 at the upper part of the submerged nozzle is consistent with the minimum inner diameter of the lower opening and the bowl opening of the molten steel inflow section 11, the inner diameter is 80mm, the outer diameter is 150mm, and the height of the equal-diameter circular channel section 12 is 290 mm.
The upper opening of the flow distribution channel section 13 is connected with the lower opening of the equal-diameter circular channel section 12, the lower opening of the flow distribution channel section 13 is connected with the upper opening of the expansion outflow section 14, the internal channel of the flow distribution channel section 13 smoothly and smoothly gradually expands and transits to the oval cross section of the expansion outflow section 14 from the circular cross section of the inlet, the cross section area of the lower opening is 2 times of that of the upper opening, and the height of the lower opening is 290 mm.
The width of the shunting body 2 arranged in the shunting channel section 13 is 40mm, and the height of the shunting body is 130 mm; the upper end part and the lower end part of the shunting body 2 are both 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 12.5 mm; the vertical distance between the top of the upper end of the flow distribution body 2 and the inlet of the flow distribution channel section 13 is 80 mm.
The height of the expanding outflow section 14 is 370 mm; the horizontal cross section of the internal channel is always kept in an oval shape, the cross section area is continuously and linearly expanded and changed from the upper opening to the lower opening, in the embodiment, the length of the long axis of the oval section is continuously changed from 270mm to 272mm, and the length of the short axis of the oval section is 50 mm.
In this embodiment, slag line district 3 in the mouth of a river body 1 inlays in the expansion of lower part and flows out in section 14, and the surface of slag line district 3 and the surface parallel and level of expansion outflow section 14, and the distance that the lower edge of slag line district 3 was followed apart from the expansion outflow section 14 lower mouth end is 70mm, and the wall thickness of slag line district 3 is 26mm, and the height of slag line district 3 is 290mm, follows under the slag line district 3 and begins to flow out the wall thickness of section 14 lower mouth end edge department mouth of a river body 1 and attenuate gradually to 18mm to the expansion outflow section.
In this embodiment, the manufacturing method of the submerged nozzle is as follows:
1) preparing ingredients: weighing raw materials of the nozzle body 1, the shunting body 2 and the slag line area 3 according to the weight part ratio for later use, then respectively and uniformly mixing the raw materials through a high-speed mixer, and drying the raw materials for later use; the shunting body 2 is made of a spinel-zirconium-carbon material and comprises the following components in percentage by mass: 71% of magnesium aluminate spinel (0.5-0mm), 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) molding: firstly, putting the raw material of the shunt body 2 into a special die for the shunt body, and pre-forming the raw material in an isostatic pressing device at a high pressure of 190 MPa; then assembling the pre-molded specially-made shunting body 2 into a mold of the nozzle body 1, filling other raw materials and raw materials of the slag line area 3 into the mold of the nozzle body 1, and finally performing final molding together by an isostatic pressing device at a pressure of 120 MPa;
3) and (3) firing: the formed submerged nozzle is sintered at 1150 ℃ for 6 hours in a reducing atmosphere;
4) and (3) processing the appearance: carrying out appearance turning on the fired submerged nozzle according to the requirement of a drawing;
5) coating: coating anti-oxidation paint on the inner wall and the outer wall of the mechanically processed immersion water port to obtain a final finished product;
6) packaging: and packaging the finished product after the finished product is qualified. The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A CSP sheet billet continuous casting high-pulling-speed submerged nozzle comprises a nozzle body and a splitter; 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 flow channel, an equal-diameter circular 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 type flow channel, and the horizontal cross section of the expansion outflow section is oval; the equal-diameter circular channel section is a cylindrical channel, and the inner diameter of the equal-diameter circular channel section is equal to the minimum inner diameter of a bowl opening of the molten steel inflow section and the inner diameter of a lower opening of the molten steel inflow section; the height of the equal-diameter circular channel section is not more than one third of the total height of the water gap body.
2. The CSP thin slab casting high-casting-speed submerged nozzle according to claim 1, characterized in that the circular cross section of the equal-diameter circular channel section is smoothly and gradually expanded and transited to the elliptical cross section of the expanded outflow section through the diversion channel section, and along the width direction, two end points of the major axis of the elliptical cross section of the diversion channel section are transited along the curve with the curvature radius of 500-1000 mm; in the thickness direction, two end points of a short shaft of the elliptic cross section of the flow distribution channel section smoothly and gradually contract, the cross section area of a lower opening of the flow distribution channel section is 1.8-2.5 times of that of an 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.
3. The CSP thin slab continuous casting high casting speed submerged nozzle according to claim 1, characterized in that the width of the split fluid is 20-50 mm, and the height is 3-5 times of the width; and the height of the shunting body does not exceed the height of the shunting channel section; the upper end part and the lower end part of the shunt body are both 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 of the shunting body and the upper opening of the shunting channel section is 60-100 mm.
4. The CSP thin slab casting high casting speed submerged nozzle as claimed in claim 1 or 3, wherein the shunt is a spinel-Zr-C shunt, and the components by mass fraction are: 70-75% of magnesium aluminate 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 particle size composition of the magnesia-alumina spinel is 0.5-0mm, and the model of the stabilized zirconia is No. 325; the model of the crystalline flake graphite is-199, and the model of the magnesium-aluminum alloy powder is 200 #; the phenolic resin is a liquid phenolic resin.
5. The CSP thin slab casting high casting speed submerged nozzle according to claim 1, wherein the height of the expanding 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 in an oval shape, the length of the long axis is gradually expanded and increased linearly from top to bottom, the length of the long axis of the upper opening of the expansion outflow section is 125% -145% of the length of the long axis of the lower opening of the expansion outflow section, and the length of the short axis is kept unchanged from top to bottom.
6. The CSP thin slab casting high-casting-speed submerged nozzle as claimed in claim 5, wherein the length of the major axis of the oval cross section of the upper opening of the expanding outflow section is 260-300 mm, the length of the major axis of the oval cross section of the lower opening of the expanding outflow section is 325-405 mm, and the length of the minor axis of the oval cross section of the expanding outflow section is 40-60 mm.
7. The CSP thin slab continuous casting high-casting-speed submerged nozzle according to claim 1, characterized in that a slag line area is arranged at the lower part of the nozzle body, the slag line area is embedded in the expanding outflow section, the outer surface of the slag line area is flush with the outer surface of the expanding outflow section, the distance from the bottom of the slag line area to the lower opening edge of the expanding outflow section is 70-80 mm, 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; from the lower edge of slag line district to the expansion outflow section end opening, the wall thickness of mouth of a river body thins to 16 ~ 20mm gradually.
8. The manufacturing method of the CSP thin slab continuous casting high casting speed submerged nozzle as set forth in any one of claims 1 to 7, characterized by comprising the steps of:
1) preparing raw materials: weighing raw materials of the nozzle body, the split fluid and the slag line area according to the weight part ratio for later use, then uniformly mixing the raw materials through a high-speed mixer respectively, and drying the raw materials for later use;
2) molding: respectively assembling various prepared raw materials to corresponding parts of a nozzle mould, wherein the split-flow body raw materials are firstly placed into the split-flow body mould for high-pressure preforming through an isostatic pressing device, the forming pressure is 110-120 MPa, then the split-flow body part subjected to high-pressure preforming is assembled into the nozzle mould, and the split-flow body part is finally formed along with the raw materials of other parts;
3) and (3) firing: firing the formed submerged nozzle at 1100-1200 ℃ for more than 5 hours in a reducing atmosphere;
4) and (3) processing the appearance: carrying out appearance turning on the fired submerged nozzle according to the requirement of a drawing;
5) coating: coating anti-oxidation paint on the inner wall and the outer wall of the mechanically processed immersion water port to obtain a final finished product;
6) packaging: and packaging the finished product after the finished product is qualified.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116745047A (en) * | 2021-04-15 | 2023-09-12 | 品川耐火材料株式会社 | Immersion nozzle for continuous casting |
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| CN116745047B (en) * | 2021-04-15 | 2024-03-22 | 品川耐火材料株式会社 | Immersion nozzle for continuous casting |
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| CN110695349B (en) | 2024-03-12 |
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