CN107303601B - Cooling monitoring system and method for casting blank - Google Patents
Cooling monitoring system and method for casting blank Download PDFInfo
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- CN107303601B CN107303601B CN201610247428.5A CN201610247428A CN107303601B CN 107303601 B CN107303601 B CN 107303601B CN 201610247428 A CN201610247428 A CN 201610247428A CN 107303601 B CN107303601 B CN 107303601B
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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Abstract
The invention provides a casting blank cooling monitoring system, which is used for monitoring the working state and the cooling effect of a spray cooling device of a segment of a casting blank in the continuous casting process, and comprises the following steps: the guide rail is arranged on one side of the fan-shaped section of the casting blank in parallel, and the track of the guide rail is over against the narrow surface of the fan-shaped section of the casting blank and has the same direction as the narrow surface; the sliding device comprises a motor and a sliding block arranged on the guide rail, and the motor drives the sliding block to slide on the track of the guide rail; the heat insulation box body is arranged on the sliding block, and a window is arranged on one surface of the heat insulation box body, which faces to the fan-shaped section of the casting blank; and the temperature measuring device is arranged in the heat insulation box body and is used for measuring the temperature of the fan-shaped section of the casting blank through the window. The invention provides a method for monitoring cooling of a casting blank. The invention can monitor the temperature and the cooling state of the casting blank in real time and avoid the quality fluctuation of the casting blank caused by unreasonable cooling water amount.
Description
Technical Field
The invention relates to a system and a method for monitoring the cooling of a casting blank, in particular to a system and a method for monitoring the working state and the cooling effect of a spray cooling device of a segment of the casting blank in the continuous casting process.
Background
In the continuous casting process, when molten steel enters the crystallizer, the molten steel is cooled by cooling water of the crystallizer, and a solidified shell with a certain thickness is formed in the molten steel in the crystallizer. And when the casting blank exits from the crystallizer and enters the fan-shaped section, carrying out secondary cooling on the primary solidified blank shell.
In order to obtain a finished cast strand, cooling of the cast strand in the direction of the strand withdrawal and in the transverse direction is of great importance. In actual production, the steel grade, the section width, the casting temperature and the drawing speed of a casting blank are changed, and the current secondary cooling water control method is only changed along with the drawing speed, so that the casting blank can be cooled excessively or insufficiently, and the surface and internal defects of the casting blank are caused.
With the development of continuous casting technology, although the newly designed casting machine has the function of width cutting for secondary cooling, and casting of casting blanks with different widths is carried out, in the design and production, the cooling of the casting blanks in the width direction is not uniform due to unreasonable design of the width cutting amount.
The continuous casting production process is a high-temperature closed process, personnel cannot obtain the cooling state of a casting blank, and the control difficulty is brought to the process and the operators. In particular, when casting crack-sensitive steel grades, cracks often occur due to an inadequate cooling of the strand corners.
The secondary cooling control of the continuous casting production is not only the size and distribution of the water quantity including the secondary cooling, but also the state of the secondary cooling equipment is important, but no secondary cooling control method which comprehensively considers the distribution of the cooling water quantity and the state of the spraying equipment exists so far. One important reason is that during continuous production, cover plates are arranged between fan-shaped sections of the casting machine and between the rolls, the side surfaces of the casting machine are in an approximately closed state, operators cannot directly observe and measure the cooling state of a casting blank in the casting machine and the state of secondary cooling spray water, and cannot accurately judge the control of the secondary cooling water and the state of spray equipment.
Based on the above situation, the control method of the secondary cooling water amount is mainly controlled by an upper computer or a calculation model at present, and the state of the control method is based on the ideal assumed state of the process and equipment. Whether the equipment state is good or not is also checked after the equipment passes the offline. Therefore, a real-time online control method for integrating the water quantity and the equipment state of secondary cooling is urgently needed.
In the prior patent, the secondary cooling water control method focuses on the measurement of the surface temperature of a model and a casting blank, and the fixed position is monitored only by installing a limited temperature sensor even if the real-time monitoring is available. The continuous casting secondary cooling control process is a continuous process and comprises two parts, namely a process part and an equipment part. Furthermore, the in-line control method for cooling the corners of crack-sensitive steel is more rarely studied.
Patent CN102380597B provides a method for controlling the width of secondary cooling water spray in slab continuous casting. A plate blank solidification heat transfer simulation model is established through a computer, the heat transfer model is used for adjusting the selection and arrangement of nozzles in the middle of the wide surface of a plate blank, the model is used for calculating the cooling water flow of different loops and implementing strategy cooling according to the calculated cooling water flow, so that the surface temperature of a casting blank is uniform.
Patent CN1228159C discloses a method for measuring the surface temperature of a continuous casting secondary cooling casting blank, which measures the surface temperature of a single-point or multi-point casting blank in the secondary cooling area of a casting machine, and determines the rationality of the casting blank drawing speed according to the temperature value.
Patent CN101506634B describes a method for measuring surface temperature of continuous casting slab, which utilizes the comparison between the temperature in the field of view of a scanning thermal imager and the measured value of thermal image, and selects the temperature value of the minimum point affected by the iron scale of the casting slab as the surface temperature value of the casting slab, and the temperature value does not participate in the secondary cooling control.
According to the patent, the temperature of the casting blank is calculated and evaluated through a model or a limited temperature measuring point in the conventional secondary cooling control method, the temperature of the casting blank cannot be reasonably applied and reflected to cooling water control, the state of spraying equipment is not monitored, and the ideal method hardly reflects the actual cooling condition of the casting blank.
Disclosure of Invention
To this end, the invention provides a casting blank cooling monitoring system for monitoring the working state and cooling effect of a spray cooling device of a segment of a casting blank in a continuous casting process, which comprises the following steps: the guide rail is arranged on one side of the fan-shaped section of the casting blank in parallel, and the track of the guide rail is over against the narrow surface of the fan-shaped section of the casting blank and has the same direction as the narrow surface; the sliding device comprises a motor and a sliding block arranged on the guide rail, and the motor drives the sliding block to slide on the track of the guide rail; the heat insulation box body is arranged on the sliding block, and a window is arranged on one surface of the heat insulation box body, which faces to the fan-shaped section of the casting blank; and the temperature measuring device is arranged in the heat insulation box body and is used for measuring the temperature of the fan-shaped section of the casting blank through the window.
Furthermore, the monitoring system also comprises an imaging device which is arranged inside the heat insulation box body and shoots the picture of the fan-shaped section of the casting blank through the window.
Further, the monitoring system also comprises a steering device which is arranged between the sliding block and the heat insulation box body, and the heat insulation box body is connected to the sliding block through the steering device and used for changing the direction of the heat insulation box body so as to change the orientation of the window.
Further, the monitoring system also comprises a cooling air pipe, one end of the cooling air pipe is connected to a cold air source capable of generating cold air, and the other end of the cooling air pipe is communicated with the air inside the heat insulation box body, so that the cold air from the cold air source is conveyed to the inside of the heat insulation box body.
Further, the monitoring system also comprises an upper computer, wherein the temperature measuring device transmits the temperature measured by the temperature measuring device to the upper computer; the imaging device transmits the pictures shot by the imaging device to the upper computer; and the upper computer controls the spray cooling equipment according to the temperature and the picture.
Preferably, the monitoring system further comprises an upper computer, the temperature measuring device and the imaging device are thermal imagers, and the thermal imagers transmit the measured temperature and the shot pictures to the upper computer; and the upper computer controls the spray cooling equipment according to the temperature and the picture.
In another aspect, the present invention provides a method for monitoring cooling of a casting slab, which is used for monitoring the working state and cooling effect of a spray cooling device for a segment of the casting slab in a continuous casting process, and comprises: measuring the temperature of the segment of the casting blank; and comparing the temperature with a target temperature, if the temperature is higher than the target temperature, controlling the spray cooling equipment to increase the water quantity of the spray water, and if the temperature is lower than the target temperature, controlling the spray cooling equipment to decrease the water quantity of the spray water.
Further, measuring the temperature of the segment of the cast slab comprises measuring the temperature of a corner of the segment of the cast slab; the method for monitoring the cooling of the casting blank further comprises the following steps: and when the deviation of the temperature of the corner part and the set temperature exceeds a threshold value, giving an alarm prompt.
Further, the method for monitoring the cooling of the casting blank further comprises the following steps: shooting a picture of a sector section of the casting blank; judging the working state of the spray cooling equipment according to the picture: and if the corner of the fan-shaped section of the casting blank is covered by spray water, moving the position of a spray rod of the spray cooling equipment so that the spray water avoids the corner of the fan-shaped section of the casting blank.
Further, the determining the working state of the spray cooling device according to the picture further includes: and if the atomization degree of the spray water does not meet the set degree, judging that the nozzle of the spray cooling equipment breaks down.
According to the cooling monitoring system and method for the casting blank, the casting blank is subjected to temperature measurement and spray water detection through the thermal imager arranged on the side face of the casting blank, the water quantity of the spray water is controlled according to the temperature state of the surface of the casting blank, the position of the spray rod is controlled and the state of the spray nozzle is judged according to the spray state of the spray cooling equipment, the temperature and the cooling state of the wide face, the narrow face and the corner of the casting blank can be monitored in real time, the quality fluctuation of the casting blank caused by unreasonable cooling water quantity is avoided, and the cooling monitoring system and method are particularly suitable for crack sensitive steel.
Drawings
FIG. 1 is a schematic structural view of a system for monitoring cooling of a cast slab according to the present invention;
fig. 2 is an enlarged view of another angle of the system for monitoring the cooling of a cast slab according to the present invention, in which the side wall of the heat-insulating box is opened.
Detailed Description
The system and method for monitoring cooling of a cast slab according to the present invention will be described in further detail with reference to the accompanying drawings and embodiments, but the invention is not limited thereto.
The cooling monitoring system of the casting blank is used for monitoring the working state and the cooling effect of the spray cooling equipment of the sector section of the casting blank in the continuous casting process. As shown in fig. 1 and 2, it includes: the device comprises a guide rail 5, a sliding device arranged on the guide rail 5, a heat insulation box body 1 arranged on the sliding device, and a temperature measuring device and an imaging device which are arranged in the heat insulation box body 1.
As shown in fig. 1 and 2, the guide 5 is arranged parallel to one side of the segment of the cast strand, with its trajectory facing and running in the same direction as the narrow face (i.e. the side face) of the segment of the cast strand 6. The guide rail 5 is arranged on a foundation frame wall beside the casting machine and is not connected with the fan-shaped section frame of the casting blank 6, and the hoisting and the maintenance of the fan-shaped section of the casting machine are not interfered mutually. The guide 5 extends from the exit of the mould up to the exit of the casting machine with an arc which is the same as and parallel to the arc of the segment of the cast strand 6.
The sliding device comprises a motor 3 and a slide block 4 arranged on the guide rail, the motor 3 can be arranged on the slide block 4 as shown in the figure, and the motor 3 drives the slide block 4 to slide back and forth on the track of the guide rail 5 at a certain speed. The sliding speed and the sliding direction of the sliding block 4 can be controlled by an upper computer.
The heat insulation box 1 is arranged on the slide 4 and a window 9 is arranged on one side of the heat insulation box 4 facing the segment of the casting block 6. In order to protect the temperature measuring device and the imaging device from high temperatures, they are arranged inside the heat insulated box 1, which is able to measure the temperature of the segment of the cast strand 6 through the window 9 and to take a picture of the segment of the cast strand 6. Preferably, the thermometry device and the imaging device are a thermal imager 10 that integrates thermometry and imaging functions.
According to the cooling monitoring system for the casting blank, the thermal imager 10 is arranged on the guide rail 5 beside the sector section of the casting blank 6, so that the casting blank 6 can be continuously subjected to temperature measurement and shooting, and the real-time monitoring effect is achieved.
The casting blank cooling monitoring system further comprises a steering device 2 which is arranged between the sliding block 4 and the heat insulation box body 1, the heat insulation box body 1 is connected to the sliding block 4 through the steering device 2 and used for changing the direction of the heat insulation box body 1 so as to change the orientation of the window 9, and the window 9 can be aligned to the narrow surface of the casting blank 6. Further, in order to enable the temperature measuring device and the imaging device to be more accurately aligned with the narrow surface, the wide surface, and the corner of the cast slab 6, the temperature measuring device and the imaging device are connected to the heat insulation box 1 through the pitching device 11.
Since the continuous casting process is a high-temperature closed process, in order to further protect the temperature measuring device and the imaging device inside the heat insulation box 1, the casting blank cooling monitoring system of the present invention further comprises a cooling air pipe 8, one end of which is connected to a cold air source (not shown in the figure) capable of generating cold air, and the other end of which is communicated with the air inside the heat insulation box 1, so as to deliver the cold air from the cold air source to the inside of the heat insulation box 1.
In order to realize automatic monitoring, the casting blank cooling monitoring system further comprises an upper computer (not shown in the figure), the temperature measuring device transmits the measured temperature and the image shot by the imaging device to the upper computer, and the upper computer controls the spray cooling equipment according to the received temperature and the image. The temperature and the picture acquired by the thermal imager 10 are transmitted to an upper computer (for example, a computer in a control room), the upper computer compares the measured temperature with a target temperature set in the continuous casting process, and the water amount is increased and decreased by using a control program. The upper computer can control the spray cooling equipment according to the cooling monitoring method of the casting blank.
The invention also provides a casting blank cooling monitoring method, which is used for monitoring the working state and the cooling effect of the spray cooling equipment of the segment of the casting blank in the continuous casting process. The method comprises the following steps: measuring the temperature of the narrow surface, the wide surface and the corner of the sector section of the casting blank 6; comparing the temperatures with corresponding target temperatures, and controlling the spray cooling equipment to increase the water amount of spray water if the measured temperature is higher than the target temperature; and otherwise, if the measured temperature is lower than the target temperature, controlling the spray cooling equipment to reduce the water amount of the spray water. The temperatures of different areas of the sector section of the casting blank 6 are continuously measured, the temperatures of different areas of the sector section of the casting blank 6 are compared and adjusted in combination with the water distribution model, and the water quantity of the area is adjusted and controlled according to the temperature difference and the adjustment coefficient.
Meanwhile, the method may further include: and comparing the temperature of the corner of the sector section of the casting blank 6 with a set temperature, and giving an alarm prompt when the deviation of the temperature of the corner and the set temperature exceeds a threshold value. For producing some crack sensitive steel types, the corners of the steel types are easy to crack due to the fact that the temperature of the casting blank is too low in the bending section and the straightening section, and the temperature of the casting blank is low, namely the cooling water amount is too large or the spray water does not avoid the corners of the casting blank. The method can measure the temperature of the corner of the casting blank and adjust the water quantity, so as to avoid the supercooling of the corner.
The thermal imager carries out non-contact temperature measurement and monitoring on the casting blank, can obtain the temperature of the wide surface, the narrow surface and the corner of the casting blank, and continuously transmits data signals to the upper computer. The upper computer compares the acquired temperature with a set target temperature of the steel grade, and when the actual temperature deviates from the target temperature, the cooling water amount is increased or decreased according to a preset adjusting method, so that the temperature of the casting blank is continuously and stably controlled within a reasonable range along the set target temperature. The target temperature of the casting blank is divided into three curves, namely a wide surface, a narrow surface and a corner. The focus curves of interest can be set for different steel grades, the broad face temperature is focused on general steel grades, and the temperature of the casting blank corner is focused on crack sensitive steel grades, such as peritectic steel and microalloy steel.
The method for monitoring the cooling of the casting blank further comprises the following steps: shooting a picture of a sector section of the casting blank 6; judging the working state of the spray cooling equipment according to the picture:
1) if the corners of the segment of the casting blank 6 are covered by spray water, the positions of the spray bars of the spray cooling equipment are moved so that the spray water avoids the corners of the segment of the casting blank 6, and the cracks caused by the supercooling of the corners of the casting blank are avoided.
2) If the atomization degree of the spray water does not meet the set degree, the spray cooling equipment is judged to have faults of blockage, abrasion and the like, so that the equipment faults can be found in time, and the spray nozzles can be replaced.
3) The retention state of the cooling water at the contact part of the pinch roll 7 and the cast slab 6 is monitored, and if the retained cooling water is more than a predetermined value, the spray cooling equipment is controlled to reduce the amount of the spray water.
The method for monitoring the cooling of the cast slab of the present invention may be executed by an upper computer, a central control computer, or the like, or may be judged and controlled manually.
By the casting blank cooling monitoring system and the casting blank cooling monitoring method, the states of spray water, the positions of spray rods and the states of nozzles of secondary cooling spray cooling equipment of the casting blanks can be observed and controlled. The method can not only control the amount of cooling water on line in real time to realize uniform cooling of the casting blank and improve the quality of the casting blank, but also can carry out on-line inspection on the spraying equipment, find faults in time and improve the production efficiency.
The above embodiments are merely exemplary embodiments of the present invention, which should not be construed as limiting the scope of the present invention, which is defined by the following claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and these modifications and equivalents should also be construed as falling within the scope of the present invention.
Claims (8)
1. A cooling monitoring system of casting blank for the operating condition and the cooling effect of the spray cooling equipment of the sector of casting blank are monitored in the continuous casting process, which is characterized by comprising:
the guide rail is arranged on one side of the fan-shaped section of the casting blank in parallel, and the track of the guide rail is over against the narrow surface of the fan-shaped section of the casting blank and has the same direction as the narrow surface;
the sliding device comprises a motor and a sliding block arranged on the guide rail, and the motor drives the sliding block to slide on the track of the guide rail;
the heat insulation box body is arranged on the sliding block, and a window is arranged on one surface of the heat insulation box body, which faces to the fan-shaped section of the casting blank;
the temperature measuring device is arranged inside the heat insulation box body and is used for measuring the temperature of the fan-shaped section of the casting blank through the window;
the steering device is arranged between the slide block and the heat insulation box body, and the heat insulation box body is connected to the slide block through the steering device and used for changing the direction of the heat insulation box body so as to change the direction of the window;
and the pitching device is connected with the temperature measuring device and the heat insulation box body and is used for changing the orientation of the temperature measuring device.
2. The casting slab cooling monitoring system according to claim 1, further comprising an imaging device disposed inside the heat insulation box to photograph a segment of the casting slab through the window.
3. The system for monitoring and cooling of a casting slab of claim 2, further comprising a cooling air pipe, one end of the cooling air pipe is connected to a cold air source capable of generating cold air, and the other end of the cooling air pipe is communicated with air inside the heat insulation box, and the cold air from the cold air source is conveyed to the inside of the heat insulation box.
4. The system for monitoring the cooling of a casting slab of claim 2, further comprising an upper computer, wherein,
the temperature measuring device transmits the measured temperature to the upper computer;
the imaging device transmits the pictures shot by the imaging device to the upper computer;
and the upper computer controls the spray cooling equipment according to the temperature and the picture.
5. The cooling monitoring system for casting blank according to claim 2, further comprising an upper computer, wherein the temperature measuring device and the imaging device are thermal imaging instruments,
the thermal imager transmits the measured temperature and the shot picture to the upper computer;
and the upper computer controls the spray cooling equipment according to the temperature and the picture.
6. A method of monitoring cooling of a cast slab using the system for monitoring cooling of a cast slab according to any one of claims 1 to 5, for monitoring the operating state and cooling effect of a spray cooling device for a segment of a cast slab during continuous casting, comprising:
arranging a guide rail on one side of the fan-shaped section of the casting blank, wherein the track of the guide rail is over against the narrow surface of the fan-shaped section of the casting blank and has the same direction as the narrow surface;
a sliding device is arranged on the guide rail; a heat insulation box body is arranged on the sliding device; a temperature measuring device is arranged in the heat insulation box body; a steering device is arranged between the sliding device and the heat insulation box body; the temperature measuring device and the heat insulation box body are connected through a pitching device;
measuring the temperature of the sector section of the casting blank by using the temperature measuring device;
comparing the temperature with a target temperature, if the temperature is higher than the target temperature, controlling the spray cooling equipment to increase the water quantity of spray water, and if the temperature is lower than the target temperature, controlling the spray cooling equipment to decrease the water quantity of the spray water;
shooting a picture of a sector section of the casting blank;
judging the working state of the spray cooling equipment according to the picture: and if the corner of the fan-shaped section of the casting blank is covered by spray water, moving the position of a spray rod of the spray cooling equipment so that the spray water avoids the corner of the fan-shaped section of the casting blank.
7. The method of monitoring cooling of a cast slab of claim 6, wherein measuring the temperature of the segment of the cast slab comprises measuring the temperature of a corner of the segment of the cast slab; the method for monitoring the cooling of the casting blank further comprises the following steps: and when the deviation of the temperature of the corner part and the set temperature exceeds a threshold value, giving an alarm prompt.
8. The method for monitoring the cooling of a casting slab according to claim 6, wherein the determining the operating state of the spray cooling device according to the picture further comprises: and if the atomization degree of the spray water does not meet the set degree, judging that the nozzle of the spray cooling equipment breaks down.
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CN109434048A (en) * | 2018-12-28 | 2019-03-08 | 西安科唯电热科技有限公司 | A kind of crystallizer cooling device and its cooling means |
TWI681831B (en) * | 2019-02-01 | 2020-01-11 | 中國鋼鐵股份有限公司 | Temperature monitoring system and method for monitoring temperature |
CN110802208B (en) * | 2019-11-13 | 2021-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for adjusting water yield of continuous casting production in high-latitude area |
CN111408697A (en) * | 2020-04-27 | 2020-07-14 | 山东钢铁集团日照有限公司 | Automatic descaling and cooling device for high-temperature slab section |
CN114226666A (en) * | 2021-12-20 | 2022-03-25 | 上海弘铭冶金技术工程有限公司 | Efficient temperature compensation cooling system for high-pulling-speed production of small square billets |
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DE3170966D1 (en) * | 1981-01-12 | 1985-07-25 | Mannesmann Ag | Method and apparatus for inspecting cast strips in a continuous casting machine |
JPS5849236U (en) * | 1981-09-29 | 1983-04-02 | 株式会社神戸製鋼所 | Slab surface temperature measuring device |
CN101162171B (en) * | 2007-11-28 | 2010-06-09 | 重庆大学 | Method for measuring surface temperature of high-temperature casting billet within water fog medium |
CN202599530U (en) * | 2011-11-29 | 2012-12-12 | 中冶连铸技术工程股份有限公司 | Casting-billet surface scanning temperature measurement system |
CN102489680B (en) * | 2011-12-28 | 2013-05-08 | 东北大学 | System and method for intelligently controlling temperature of internal arc angle part in straightening region of wide and thick plate blank |
CN102935496B (en) * | 2012-10-23 | 2016-03-02 | 鞍钢股份有限公司 | A kind of portable continuous casting billet surface temperature measurement device and temp measuring method |
CN204308147U (en) * | 2014-12-01 | 2015-05-06 | 鞍钢股份有限公司 | A kind of continuous casting billet surface temperature measurement device |
CN105057626B (en) * | 2015-08-27 | 2017-04-12 | 东北大学 | Control system and method for grain refinement of corners of continuous casting billets |
CN105478704B (en) * | 2016-01-04 | 2018-03-23 | 河北钢铁股份有限公司邯郸分公司 | Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect |
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