CN113798452A - Square billet continuous casting crystallizer copper pipe and method for efficiently utilizing cooling water - Google Patents
Square billet continuous casting crystallizer copper pipe and method for efficiently utilizing cooling water Download PDFInfo
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- CN113798452A CN113798452A CN202111216802.2A CN202111216802A CN113798452A CN 113798452 A CN113798452 A CN 113798452A CN 202111216802 A CN202111216802 A CN 202111216802A CN 113798452 A CN113798452 A CN 113798452A
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- cooling water
- crystallizer copper
- copper pipe
- flow guide
- guide channel
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- 239000000498 cooling water Substances 0.000 title claims abstract description 92
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 75
- 239000010949 copper Substances 0.000 title claims abstract description 75
- 238000009749 continuous casting Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 abstract description 22
- 229910000831 Steel Inorganic materials 0.000 description 22
- 239000010959 steel Substances 0.000 description 22
- 238000012546 transfer Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 7
- 238000009835 boiling Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a square billet continuous casting crystallizer copper pipe and a method for efficiently utilizing cooling water, wherein the crystallizer copper pipe comprises a crystallizer copper pipe body, a plurality of flow guide channels are axially arranged on the pipe wall of the crystallizer copper pipe body, the cross sections of all the flow guide channels are circular, a plurality of spiral raised lines are uniformly distributed on the inner wall of each flow guide channel, and each raised line is axially arranged along the flow guide channel, so that the cooling water in the flow guide channel is convenient to spirally rise from bottom to top under the guiding action of the raised lines. The cooling structure of the crystallizer copper pipe can disturb the cooling water flowing through the flow guide channel, so that the cooling water in the flow guide channel spirally rises, the cooling water in the flow guide channel is ensured to completely participate in heat exchange, the cooling effect of the crystallizer copper pipe is improved, the high-speed continuous casting is further realized, and the important significance is realized on resource conservation.
Description
Technical Field
The invention belongs to the technical field of continuous casting, and particularly relates to a square billet continuous casting crystallizer copper pipe and a method for efficiently utilizing cooling water.
Background
For the continuous casting of the square billet, the casting machine designed and put into production before the 90 s of the 20 th century has lower pulling speed and lower production efficiency. In about 95 years, the research work of the square billet continuous casting high efficiency is started in China. The most obvious characteristic of the square billet continuous casting high efficiency is high speed, and the drawing speed of the same square billet continuous casting section is improved by times. By 2010, nearly all casting machines mainly used for producing construction steel in China realize high-efficiency and high-speed casting, such as 150mm by 150mm2The section continuous casting drawing speed generally reaches about 3.0-3.5 m/min. In recent years, with the increasing maturity and deepening of steel production technology, the continuous casting technology of steel has many new progresses, but the high speed of continuous casting still is the key point of research, because the high speed continuous casting not only can increase the productivity of enterprises and improve economic benefits, but also can make outstanding contribution to energy conservation, emission reduction and resource conservation.
The crystallizer is used as a cooling device in the steel continuous casting process, and plays an important role in enabling molten steel to form an initial solidified billet shell, but the cooling capacity of the crystallizer for the molten steel greatly limits the improvement of the continuous casting drawing speed. The higher the drawing speed is, the shorter the cooling time (residence time) of the molten steel in the crystallizer is, which may result in that the thickness of the solidified shell of molten steel is too low when the solidified shell of molten steel exits from the crystallizer and the static pressure of the molten steel which is not solidified in the shell of molten steel cannot be borne, thereby the shell of molten steel is broken and steel leakage is caused. In order to increase the speed of continuous casting, it is necessary to further increase the cooling strength of the mold while reducing the cooling time, and one of the approaches is to use a more efficient mold copper tube cooling structure.
The molten steel is cooled by cooling water introduced into a crystallizer copper pipe, and the cooling structure of the prior square billet continuous casting crystallizer copper pipe mainly comprises the following three types: the first one is that a plurality of flow guide channels 2 (as shown in figure 1 a) are arranged on the tube wall of the crystallizer copper tube body 1 along the axial direction, and cooling water flows in the flow guide channels 2 from bottom to top for heat exchange; the second is a cooling structure, namely a water gap 4 (as shown in fig. 1 b), which enables cooling water to be in circumferential contact with the outer wall surface of the crystallizer copper tube body 1, the structure needs a water jacket 3 to seal the cooling water, and the cooling water moves from the lower part to the upper part of the crystallizer along the water gap 4, and exchanges heat with high-temperature molten steel in the crystallizer copper tube during the movement, and the traditional cooling structure is the most common at present; the third is that a longitudinal water tank 5 (as shown in figure 1 c) is processed on the outer wall surface of the crystallizer copper tube body 1, and cooling water also flows in the water tank 5 from bottom to top for heat exchange.
The cooling structure of the prior common square billet crystallizer copper pipe basically cannot disturb the cooling water, so that the introduced cooling water cannot be fully utilized, because the cooling water can generate a laminar boundary layer on a contact surface when flowing along a smooth wall surface, and the flowing direction of the cooling water in the laminar region is parallel to the wall surface. Because the heat of the molten steel is transmitted into the cooling water through the crystallizer copper pipe, the cooling water attached to the wall surface of the copper pipe absorbs heat firstly, but because the cooling water at the position is in the laminar boundary layer, the cooling water absorbs heat and then flows vertically and ascends parallel to the wall surface, the cooling water is not easy to disturb the relatively low-temperature cooling water with less heat absorption at the outer layer so as to generate strong heat exchange, the temperature of the cooling water is layered, and the cooling water at the outer layer is not efficiently utilized for heat transfer. And the cooling water close to the hot wall surface can not be far away from the hot wall surface due to the laminar flow state of the cooling water, and strong heat exchange is always kept with the hot wall surface, so that the cooling water in the area is likely to boil, and the boiling can enable the interface of the copper wall and the cooling water to form film-state or nuclear-state heat transfer, thereby greatly reducing the heat transfer effect of the crystallizer, causing the over-high temperature of the copper pipe, the reduction of the service life, easy scaling and even steel leakage accidents. Based on the commonly used copper pipe cooling structure at present, in order to suppress the boiling of the cooling water, the most common method is to increase the flow rate of the cooling water, so as to reduce the retention time of the cooling water in the crystallizer, reduce the temperature of the cooling water on the wall surface, and enhance the cooling effect of the crystallizer.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a copper tube for a square billet continuous casting crystallizer and a method thereof, which efficiently utilize cooling water, wherein the cooling structure of the copper tube for the crystallizer can disturb the cooling water flowing through a flow guide channel, so that the cooling water in the flow guide channel spirally rises, the cooling water in the flow guide channel is ensured to completely participate in heat exchange, the cooling effect of the copper tube for the crystallizer is improved, and the copper tube for the square billet continuous casting crystallizer and the method thereof have important significance for further realizing high speed continuous casting and saving resources.
The technical scheme of the invention is realized as follows:
the utility model provides a square billet continuous casting crystallizer copper pipe of high-efficient cooling water of utilizing, includes crystallizer copper pipe body to be equipped with a plurality of water conservancy diversion ways along the axial on the pipe wall of crystallizer copper pipe body, the cross section of all water conservancy diversion ways is circular, and evenly distributed has a plurality of heliciform sand grips on every water conservancy diversion way inner wall, and every sand grip sets up along the water conservancy diversion way axial, and the cooling water in the water conservancy diversion way of being convenient for is spiral shell screwing up from bottom to top under the guide effect of sand grip.
Furthermore, the diversion channels on the four side pipe walls of the crystallizer copper pipe body are uniformly distributed, and the diversion channels on each side pipe wall are symmetrically arranged along the axial central line of the side pipe wall.
Further, the cross section of the convex strip is but not limited to a semicircle, a trapezoid, a triangle or a rectangle.
A method for efficiently utilizing cooling water is characterized in that the crystallizer copper tube is continuously cast by adopting the square billet, after the cooling water enters a guide channel from the lower end of a crystallizer copper tube body, the cooling water generates a tangential flow velocity under the guiding action of a convex strip on the inner wall of the guide channel, so that the cooling water spirally rises from bottom to top, and the cooling water in the guide channel efficiently exchanges heat with the crystallizer copper tube body.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the spiral raised lines are arranged in the copper pipe flow guide channel of the crystallizer, so that the cooling water can generate tangential speed under the guiding action of the raised lines after entering the flow guide channel, the cooling water spirally rises from bottom to top, the vertical flowing state of the cooling water is changed, the thickness of a laminar boundary layer of the cooling water can be effectively reduced, the heat exchange is favorably enhanced, and the cooling effect of the copper pipe is improved; meanwhile, cooling water in the diversion channel can exchange heat alternately on a hot surface and a cold surface, the heat exchange capacity is greatly improved, all cooling water in the diversion channel is efficiently utilized, the cooling effect of the copper pipe is improved, the temperature of the cooling water in the diversion channel is uniform, the local boiling of the cooling water is further avoided, the service life of the crystallizer copper pipe is prolonged, and the scaling and steel leakage accidents of the crystallizer copper pipe are avoided.
2. The convex strip structure of the invention can enable the cooling water to gradually generate tangential velocity in the rising process, and the flow field is not excessively complicated due to the drastic change of the flow direction and the flow velocity of the cooling water, so the flow resistance is small. In practical application, the flow resistance of the convex strips to the cooling water can be adjusted by changing the number and the size of the convex strips.
3. The cooling structure can effectively utilize all cooling water flowing through the flow guide channel to improve the cooling effect of the crystallizer copper pipe, is favorable for further realizing high-speed continuous casting, and saves resources.
4. In practical application, the local heat exchange strength of the crystallizer copper pipe can be controlled by adjusting the distribution and the size of the raised line guide way on the wall of the crystallizer copper pipe body, so that uniform heat transfer is realized, the possibility of casting blank cracks is reduced, and the quality of the casting blank is favorably ensured.
Drawings
Fig. 1-a schematic transverse cross-section of a copper tube of a prior art crystallizer.
FIG. 2 is a schematic structural view of a crystallizer copper tube according to the present invention.
Fig. 3-2.
Fig. 4-the side view of fig. 2.
Fig. 5-fig. 3A-a are partially enlarged schematic views in section.
Wherein: 1-crystallizer copper tube body; 2-a flow guide channel; 3-water jacket; 4-water sewing; 5-a water tank; 6-convex strips; a-the thickness of a copper pipe of a crystallizer; b-outer diameter of copper pipe of crystallizer; c-height of copper tube of crystallizer; d-the diameter of the diversion tunnel; e-helix angle; f-the height of the raised lines; g-rib spacing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 2 to 5, a square billet continuous casting crystallizer copper tube for efficiently utilizing cooling water comprises a crystallizer copper tube body 1, wherein a plurality of flow guide channels 2 are axially arranged on the tube wall of the crystallizer copper tube body 1 for the cooling water to pass through, the cross sections of all the flow guide channels 2 are circular, a plurality of spiral raised lines 6 are uniformly distributed on the inner wall of each flow guide channel 2, and each raised line 6 is axially arranged along the flow guide channel 2, so that the cooling water in the flow guide channel 2 can spirally rise from bottom to top under the guiding action of the raised lines 6.
The cooling water introduced into the copper pipe of the crystallizer is high-pressure cooling water, the cooling water flows from bottom to top in a flow guide channel with raised lines, and the cooling water in the flow guide channel generates tangential speed due to the guiding effect of the raised lines, continuously spirally rises and alternately exchanges heat on the hot surface (the surface closest to the molten steel) of the flow guide channel. When the cooling water in the flow guide channel rotates to the hot surface of the flow guide channel, heat absorption and temperature rise are carried out, and when the cooling water rotates to the cold surface (the surface farthest from molten steel) of the flow guide channel, the heat absorption capacity is temporarily reduced, the cooling water alternately exchanges heat between the hot surface and the cold surface, boiling can be prevented, and the cooling water in the flow guide channel completely participates in the strong heat exchange process with the hot surface, so that all the cooling water in the flow guide channel is efficiently utilized, and the heat exchange capacity of the crystallizer copper pipe can be improved to a great extent.
The cross section of the flow guide channel is limited to be circular, but the diameter d of the flow guide channel is not limited, the diameters of the flow guide channels on the same side wall of the crystallizer copper pipe can be inconsistent, and the flow guide channels are not distributed at equal intervals, and the distribution and the diameter of the flow guide channels are determined according to a heat transfer result simulated by CFD software in a specific arrangement mode, so that the local heat exchange strength of the crystallizer copper pipe is controlled, uniform heat transfer is realized, the possibility of casting blank cracks is reduced, and the quality of the casting blank is ensured.
In practical application, in order to achieve an ideal cooling effect of the copper pipe and reduce the flow resistance of the raised lines to cooling water as much as possible, CFD software is used for simulating the heat transfer process of molten steel in the copper pipe before the crystallizer copper pipe is manufactured, and then structural parameters in the copper pipe are continuously adjusted according to the temperature and pressure results obtained through simulation and then simulation is carried out until a group of appropriate parameter values is determined. In this embodiment, four convex strips are arranged in each flow guide channel.
In specific implementation, the diversion channels 2 on the four side walls of the crystallizer copper tube body 1 are uniformly distributed, and all the diversion channels on each side wall are symmetrically arranged along the axial central line of the side wall.
The distribution of the flow deflectors on the four side walls of the crystallizer copper pipe body is consistent, which shows that the distribution mode and the structural parameters (the size of the flow deflectors, the size and the distribution of convex strips and the like) of the flow deflectors on the four side walls are the same. The four corners of the crystallizer copper pipe body are not provided with flow guide channels, so that corner heat transfer is inhibited, and cracks caused by too fast corner heat transfer cooling are avoided.
In specific implementation, the cross section of the protruding strip 6 is, but not limited to, semicircular, trapezoidal, triangular or rectangular.
The cross section of the convex strip is not limited to a semicircle, a trapezoid, a triangle or a rectangle, and can be in other shapes such as an ellipse. As shown in fig. 3 and 5, the cross section of the rib in the present embodiment is semicircular, just as an illustration.
A method for utilizing cooling water efficiently adopts the square billet continuous casting crystallizer copper tube, after the cooling water enters a flow guide channel 2 from the lower end of a crystallizer copper tube body 1, the cooling water generates tangential flow velocity under the guiding action of a raised line 6 on the inner wall of the flow guide channel 2, so that the cooling water spirally rises from bottom to top, and the cooling water in the flow guide channel efficiently exchanges heat with the crystallizer copper tube body.
After the cooling water enters the flow guide channel, the flow direction of the cooling water is disturbed by the raised lines, the tangential speed is generated, the cooling water spirally rises from bottom to top, the thickness of the laminar boundary layer of the cooling water is reduced, and the heat exchange is enhanced. Meanwhile, the cooling water can alternately exchange heat between the hot surface and the cold surface of the flow guide channel by spiral rising, so that all the cooling water in the flow guide channel is efficiently utilized, the heat exchange efficiency is greatly improved, the temperature of the cooling water in the flow guide channel is uniform, the local boiling of the cooling water is avoided, the service life of the crystallizer copper pipe is prolonged, and the scaling and steel leakage accidents of the crystallizer copper pipe are avoided.
Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (4)
1. The utility model provides a square billet continuous casting crystallizer copper pipe of high-efficient cooling water of utilizing, includes crystallizer copper pipe body to be equipped with a plurality of water conservancy diversion way along the axial on the pipe wall of crystallizer copper pipe body, its characterized in that, all water conservancy diversion way's cross section is circular, and evenly distributed has a plurality of heliciform sand grips on every water conservancy diversion way inner wall, and every sand grip sets up along the water conservancy diversion way axial, and the cooling water in the water conservancy diversion way of being convenient for is spiral-wound from bottom to top under the guide effect of sand grip.
2. The square billet continuous casting crystallizer copper pipe for efficiently utilizing cooling water as claimed in claim 1, wherein the flow guide channels on the four side pipe walls of the crystallizer copper pipe body are uniformly distributed, and the flow guide channels on each side pipe wall are symmetrically arranged along the axial center line of the side pipe wall.
3. The copper tube for a square billet continuous casting crystallizer which utilizes cooling water with high efficiency as claimed in claim 1, wherein the cross section of the convex strips is but not limited to semicircular, trapezoid, triangle or rectangle.
4. A method for efficiently utilizing cooling water is characterized in that a square billet continuous casting crystallizer copper tube according to claims 1-3 is adopted, after the cooling water enters a guide channel from the lower end of a crystallizer copper tube body, the cooling water generates a tangential flow velocity under the guiding action of convex strips on the inner wall of the guide channel, so that the cooling water spirally rises from bottom to top, and the cooling water in the guide channel efficiently exchanges heat with the crystallizer copper tube body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111216802.2A CN113798452A (en) | 2021-10-19 | 2021-10-19 | Square billet continuous casting crystallizer copper pipe and method for efficiently utilizing cooling water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111216802.2A CN113798452A (en) | 2021-10-19 | 2021-10-19 | Square billet continuous casting crystallizer copper pipe and method for efficiently utilizing cooling water |
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| CN113798452A true CN113798452A (en) | 2021-12-17 |
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| CN202111216802.2A Pending CN113798452A (en) | 2021-10-19 | 2021-10-19 | Square billet continuous casting crystallizer copper pipe and method for efficiently utilizing cooling water |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59141347A (en) * | 1983-02-01 | 1984-08-14 | Kuroki Kogyosho:Kk | Mold for continuous casting |
| SU1321514A1 (en) * | 1985-06-17 | 1987-07-07 | Вологодский Политехнический Институт | Open mould for continuous metal casting |
| CN102303103A (en) * | 2011-09-27 | 2012-01-04 | 中冶南方工程技术有限公司 | Efficient heat transfer type special-shaped blank continuous casting crystallizer |
| CN102310169A (en) * | 2011-09-27 | 2012-01-11 | 中冶南方工程技术有限公司 | Method for improving special-shaped blank continuous casting crystallizer cooling effect and crystallizer |
| CN102319877A (en) * | 2011-09-27 | 2012-01-18 | 中冶南方工程技术有限公司 | Method for strengthening cooling effect of special blank continuous-casting crystallizer and crystallizer |
| US20130319629A1 (en) * | 2010-11-25 | 2013-12-05 | Danieli & C. Officine Meccaniche Spa | Crystallizer for continuous casting |
| CN207823896U (en) * | 2018-01-03 | 2018-09-07 | 秦皇岛瀚丰长白结晶器有限责任公司 | Circular crystallizer copper pipe with spiral stream guidance slot |
| EP3395472A1 (en) * | 2017-04-25 | 2018-10-31 | SMS Group GmbH | Continuous casting mould with flow-optimised cooling |
| US20200171564A1 (en) * | 2017-03-10 | 2020-06-04 | Em Moulds S.P.A. A Socio Unico | Crystallizer for Continuous Casting and Method for Obtaining the Same |
| CN112322816A (en) * | 2020-11-05 | 2021-02-05 | 山东天铭重工科技股份有限公司 | Efficient heat exchange cooling wall for blast furnace and cooling method thereof |
| CN214349473U (en) * | 2020-11-30 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Superspeed billet continuous casting device |
-
2021
- 2021-10-19 CN CN202111216802.2A patent/CN113798452A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59141347A (en) * | 1983-02-01 | 1984-08-14 | Kuroki Kogyosho:Kk | Mold for continuous casting |
| SU1321514A1 (en) * | 1985-06-17 | 1987-07-07 | Вологодский Политехнический Институт | Open mould for continuous metal casting |
| US20130319629A1 (en) * | 2010-11-25 | 2013-12-05 | Danieli & C. Officine Meccaniche Spa | Crystallizer for continuous casting |
| CN102303103A (en) * | 2011-09-27 | 2012-01-04 | 中冶南方工程技术有限公司 | Efficient heat transfer type special-shaped blank continuous casting crystallizer |
| CN102310169A (en) * | 2011-09-27 | 2012-01-11 | 中冶南方工程技术有限公司 | Method for improving special-shaped blank continuous casting crystallizer cooling effect and crystallizer |
| CN102319877A (en) * | 2011-09-27 | 2012-01-18 | 中冶南方工程技术有限公司 | Method for strengthening cooling effect of special blank continuous-casting crystallizer and crystallizer |
| US20200171564A1 (en) * | 2017-03-10 | 2020-06-04 | Em Moulds S.P.A. A Socio Unico | Crystallizer for Continuous Casting and Method for Obtaining the Same |
| EP3395472A1 (en) * | 2017-04-25 | 2018-10-31 | SMS Group GmbH | Continuous casting mould with flow-optimised cooling |
| CN207823896U (en) * | 2018-01-03 | 2018-09-07 | 秦皇岛瀚丰长白结晶器有限责任公司 | Circular crystallizer copper pipe with spiral stream guidance slot |
| CN112322816A (en) * | 2020-11-05 | 2021-02-05 | 山东天铭重工科技股份有限公司 | Efficient heat exchange cooling wall for blast furnace and cooling method thereof |
| CN214349473U (en) * | 2020-11-30 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Superspeed billet continuous casting device |
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Application publication date: 20211217 |
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