CN108372279B - Method for measuring pouring allowance of tundish in continuous casting pouring process - Google Patents
Method for measuring pouring allowance of tundish in continuous casting pouring process Download PDFInfo
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- CN108372279B CN108372279B CN201810328871.4A CN201810328871A CN108372279B CN 108372279 B CN108372279 B CN 108372279B CN 201810328871 A CN201810328871 A CN 201810328871A CN 108372279 B CN108372279 B CN 108372279B
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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
- B22D11/10—Supplying or treating molten metal
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
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Abstract
A method for measuring the pouring allowance of a tundish in the continuous casting pouring process belongs to the field of the continuous casting pouring process; the method comprises the following steps: 1) after one continuous casting pouring time, stopping pouring the tundish when the liquid level depth of the tundish is measured to be 200-350 mm; 2) naturally cooling the tundish; 3) transferring the tundish to a slag field after cooling; 4) pouring all the solidified steel slag into a slag field and standing; 5) artificially injecting water to the steel slag in the tundish in a water cooling mode for cooling, and then naturally cooling; 6) crushing the water-cooled steel slag, carrying out omnibearing artificial water injection cooling on the steel blocks and the blocky slag, and then naturally cooling; 7) after the moisture is dried in the air, sucking out all broken steel blocks in the steel slag, wherein the quality of the steel blocks is the casting allowance of the tundish; the method can quickly and effectively accurately weigh the casting residual quantity of the intermediate ladle through a series of system operations, and has the advantages of low cost, simple and convenient operation and accurate measurement result.
Description
Technical Field
The invention belongs to the field of continuous casting and pouring processes, and particularly relates to a method for measuring pouring allowance of a tundish in the continuous casting and pouring process.
Background
The tundish is a device used for molten steel transition between the ladle and the crystallizer, and plays a role in starting and stopping after bearing molten steel flowing into the continuous casting ladle, and plays a role in reducing pressure, stabilizing flow, removing slag, shunting and the like. The tundish is not only a container in production, but has become an important ring in clean steel production. The function of the tundish is not negligible both for the forward movement of the continuous casting operation and for ensuring that the quality of the molten steel is satisfactory.
In continuous casting production, the slag discharge control in the pouring process of a tundish is one of the difficult problems troubling economic clean steel production. After the continuous casting pouring process is finished and the last ladle stops pouring, the liquid level of the molten steel in the tundish gradually descends, the descending process easily generates slag, and the harm is mainly as follows: impurities are generated to deteriorate the quality of molten steel, so that a water gap is easily blocked; the tundish slag can enter the crystallizer, so that the cleanliness of a casting blank is reduced, and steel leakage is easily induced. At present, the operation of retaining steel in a tundish is generally adopted to inhibit the slag from falling in the tundish, so that although the quality requirement is met, a large amount of molten steel in the tundish is remained, and the yield of the molten steel is reduced. Therefore, how to adopt a new process to reduce the casting allowance of the tundish to the maximum extent on the premise of avoiding slagging is the key for realizing efficient and economic control of slagging in the pouring process of the tundish. One key point in researching and developing a novel process for controlling slag tapping is to obtain the accurate casting allowance of the tundish, so that the slag tapping control effect of the novel process can be evaluated. Therefore, accurate measurement of the tundish casting allowance becomes the key for controlling the evaluation of the slagging effect.
The invention provides a method for quantitatively measuring the pouring allowance of a tundish, which solves the technical problem of quantitatively measuring the pouring allowance of the tundish systematically, has low cost, simple and convenient operation and accurate measurement result, reduces the pouring allowance of the tundish in the high-quality continuous casting pouring process and has great significance for improving the yield of molten steel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for measuring the pouring allowance of a tundish in the continuous casting pouring process, which is a quantitative measuring method of steel in slag steel, can quickly and effectively accurately weigh the pouring allowance of the tundish through a series of system operations, and has the advantages of low cost, simple and convenient operation and accurate measuring result. At present, no clear and systematic measuring method for the casting allowance of the intermediate ladle exists, and the method solves the technical problem.
A method for measuring the pouring allowance of a tundish in the continuous casting pouring process specifically comprises the following steps:
Step 6, crushing the water-cooled steel slag into steel blocks and blocky slag with the side length less than or equal to 250mm, carrying out omnibearing artificial water injection cooling on the steel blocks and the blocky slag, and then naturally cooling for 1.5-3.0 h; wherein the caliber of the water pipe is phi 25-40 mm, and the flow is 5.0-10.0 m3/h;
And 7, after the moisture in the steel blocks and the blocky slag is dried, sucking out the broken steel blocks from the steel slag by using a lifting magnet, wherein the mass of the steel blocks is the casting allowance of the tundish.
The method for measuring the pouring allowance of the tundish in the continuous casting pouring process comprises the following steps:
in the step 1, the last pack of a casting time of continuous casting is poured according to a normal pouring process.
In the step 1, measuring the liquid level depth of the tundish by using a ruler; wherein, the scale has the scale of scale that the scale was made for special high temperature resistant material, its size: the length L is 20-50 mm, the width W is 10-30 mm, and the height H is 1500-2000 mm.
In the step 1, when the liquid level depth in the tundish is measured, the ruler should be perpendicular to the bottom of the tundish to measure the vertical height.
And in the step 1, recording the steel grade, the furnace number and the time in the tundish.
In the step 2, one side of the continuous casting pouring platform refers to that the tundish car is driven to a specified cooling position on a track of the pouring platform.
In the step 2, the natural cooling time is 3.0-5.0 h.
In the step 3, the tundish is slowly transported to ensure safety in the process of transferring to the slag yard.
In the step 4, the tundish is lifted by the ladle turning mechanism and then turned over by 180 degrees, and all the solidified steel slag is poured into the slag field.
And in the step 5, uniformly and omnidirectionally watering when the omnibearing manual water injection is carried out for cooling, and continuously watering for cooling.
In the step 5, the cooling time is 2.0-4.0 h when the water is artificially injected for cooling.
In the step 6, the steel slag is carefully crushed into blocks by adopting a crushing hammer.
And 6, uniformly and omnidirectionally watering when the omnibearing manual water injection is carried out for cooling, and continuously watering for cooling.
In the step 6, the time for cooling is 2.0-3.0 h when water is artificially injected for cooling.
In the step 6, the blocky slag should be as small as possible during crushing to ensure that no steel block exists in the slag, the blocky slag adsorbed on the steel block is flushed away by water, the steel block and the blocky slag are further cooled, and weighing is started after the steel block is completely cooled.
In the step 7, the steel blocks are carefully collected by using the lifting magnets, and the large blocks and the small blocks are all completely collected.
In the step 7, the method for weighing the steel blocks comprises the following steps: (1) sucking out all broken steel blocks in the steel slag by using a lifting magnet, putting the steel blocks into a loader, and weighing the steel blocks before the loader is driven to a ground scale; (2) and (3) correcting and resetting the weighbridge, weighing the loader containing the steel block on the weighbridge and recording the weighed steel block as A1, weighing the steel block after the steel block is poured out and recording the weighed steel block as A2, wherein the difference value of the two is the mass of the steel block, namely the casting allowance of the tundish at this time is collected.
And 7, recording the real numerical value after the number indication is stable when the weighing record of the land scale is used.
Drawings
FIG. 1 is a flowchart of quantitative measurement of the amount of tundish poured in accordance with embodiments 1 to 3 of the present invention.
FIG. 2 is a schematic structural view of a pouring basket water injection cooling device according to embodiments 1 to 3 of the present invention; in the figure, 1, a water injection pipeline; 2. a control switch; 3. a pressure gauge; 4. a flow meter.
FIG. 3 is a schematic structural view of a device for measuring the depth of molten steel in a tundish by using a scale in embodiments 1 to 3 of the present invention. In the figure, 5, a scale; 6. a tundish; 7. a slag layer; 8. and (3) molten steel.
FIG. 4 is a schematic scale of embodiments 1 to 3 of the present invention; in the figure, H represents the height of the scale, and the scale is in mm.
FIG. 5 is a plan view of a scale according to embodiments 1 to 3 of the present invention; in the figure, L represents the length of the scale, W represents the width of the scale, and the scale is in mm.
Detailed Description
In the following examples, when the weight is recorded by a scale, the real value after the number is stabilized is recorded. The flow chart of quantitative measurement of the pouring allowance of the tundish in the embodiments 1 to 3 is shown in figure 1; the schematic structural diagram of the pouring basket water injection cooling device of embodiments 1-3 is shown in fig. 2; the schematic structural diagram of the device for measuring the depth of the molten steel in the tundish by the scales of the embodiments 1 to 3 is shown in FIG. 3; the scale of examples 1-3 is schematically shown in FIG. 4; the plan views of the scales of examples 1 to 3 are shown in FIG. 5.
Example 1
A method for measuring the pouring allowance of a tundish in the continuous casting pouring process specifically comprises the following steps:
step 6, carefully crushing the water-cooled steel slag into blocky slag with side length less than or equal to 250mm by using a crushing hammer, and aligning the blocky slag with the side length less than or equal to 250mmCarrying out omnibearing artificial water injection cooling on the steel blocks and the massive slag, and then naturally cooling for 1.5 h; wherein the caliber of the water pipe is phi 25mm, and the flow is 5.0m3H; the cooling time is 2.0h when the water is artificially injected for cooling; when the steel blocks are crushed, the blocky slag should be as small as possible, and the blocky slag adsorbed on the steel blocks is flushed away by water, so that the steel blocks are continuously cooled;
and 7, after the moisture in the steel blocks and the blocky slag is dried in the air, sucking out the broken steel blocks in the steel slag and the steel blocks in the blocky slag by using a lifting magnet, putting the steel blocks into a loader, weighing the loader before the loader is started to the ground scale, correcting and resetting the ground scale, weighing the loader containing the steel blocks on the ground scale and recording the weight as 18.25t, weighing the steel blocks after the steel blocks are poured out and recording the weight as 16.40t, wherein the difference value between the weight of the steel blocks and the weight of the loader is 1.85t, and the pouring allowance of the tundish is 1.85 t.
If the method for measuring the pouring allowance of the tundish in the continuous casting pouring process is not adopted, the empirical value of the pouring allowance of the tundish is estimated to be 2.30t on site, and the pouring allowance of the tundish is 1.85t by the method for measuring the pouring allowance of the tundish, so that the method is more scientific and accurate.
Example 2
A method for measuring the pouring allowance of a tundish in the continuous casting pouring process specifically comprises the following steps:
step 6, carefully crushing the water-cooled steel slag into blocky slag with the side length less than or equal to 250mm by using a crushing hammer, carrying out omnibearing artificial water injection cooling on the steel blocks and the blocky slag, and then naturally cooling for 2.5 hours; wherein the caliber of the water pipe is phi 35mm, and the flow rate is 7.0m3H; the cooling time is 2.5h when the water is artificially injected for cooling; when the steel blocks are crushed, the blocky slag should be as small as possible, and the blocky slag adsorbed on the steel blocks is flushed away by water, so that the steel blocks are continuously cooled;
and 7, after the moisture in the steel blocks and the blocky slag is dried in the air, sucking out the broken steel blocks in the steel slag and the steel blocks in the blocky slag by using a lifting magnet, putting the steel blocks into a loader, weighing the loader before the loader is started to the ground scale, correcting and resetting the ground scale, weighing the loader containing the steel blocks on the ground scale and recording the weight as 19.32t, weighing the steel blocks after the steel blocks are poured out and recording the weight as 16.60t, wherein the difference value between the two is the mass of the steel blocks, namely 2.72t, namely the pouring allowance of the tundish is 2.72 t.
If the method for measuring the pouring allowance of the tundish in the continuous casting pouring process is not adopted, the empirical value of the pouring allowance of the tundish is estimated to be 3.20t on site, and the pouring allowance of the tundish is 2.72t by the method for measuring the pouring allowance, the method is more scientific and accurate.
Example 3
A method for measuring the pouring allowance of a tundish in the continuous casting pouring process specifically comprises the following steps:
step 6, carefully crushing the water-cooled steel slag into blocky slag with the side length less than or equal to 250mm by using a crushing hammer, carrying out omnibearing artificial water injection cooling on the steel blocks and the blocky slag, and then naturally cooling for 3.0 hours; wherein the caliber of the water pipe is phi 40mm, and the flow is 10.0m3H; the cooling time is 3.0h when the water is artificially injected for cooling; when the steel blocks are crushed, the blocky slag should be as small as possible, and the blocky slag adsorbed on the steel blocks is flushed away by water, so that the steel blocks are continuously cooled;
and 7, after the moisture in the steel blocks and the blocky slag is dried in the air, sucking out the broken steel blocks in the steel slag and the steel blocks in the blocky slag by using a lifting magnet, putting the steel blocks into a loader, weighing the loader before the loader is started to the ground scale, correcting and resetting the ground scale, weighing the loader containing the steel blocks on the ground scale and recording the weight as 20.74t, weighing the steel blocks after the steel blocks are poured out and recording the weight as 16.10t, wherein the difference value between the two is 4.64t of the weight of the steel blocks, and the pouring allowance of the tundish is 4.64 t.
If the method for measuring the pouring allowance of the tundish in the continuous casting pouring process is not adopted, the empirical value of the pouring allowance of the tundish is estimated to be 5.00t on site, and the pouring allowance of the tundish is 4.64t by the method for measuring the pouring allowance of the tundish, so that the method is more scientific and accurate.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method for measuring the pouring allowance of a tundish in the continuous casting pouring process is characterized by comprising the following steps:
step 1, stopping pouring of the tundish when the liquid level depth of the tundish is measured to be 200-350 mm after the pouring of the last ladle is stopped after one pouring time of continuous casting pouring;
step 2, driving the tundish car to one side of the continuous casting pouring platform for natural cooling;
step 3, hoisting the tundish onto a rail transport vehicle by a travelling crane in a steel mill after cooling, and then transporting the tundish to a slag yard by the rail transport vehicle;
step 4, pouring all solidified steel slag into a slag yard for 20-45 m2Standing the special area for 20-40 min;
step 5, artificially injecting water to the steel slag after standing by adopting a water cooling mode for cooling, and naturally cooling for 40-60 min; wherein the caliber of the water pipe is phi 25-40 mm, and the flow is 8.0-12.0 m3/h;
Step 6, crushing the water-cooled steel slag into steel blocks and blocky slag with the side length less than or equal to 250mm, carrying out omnibearing artificial water injection cooling on the steel blocks and the blocky slag, and then naturally cooling for 1.5-3.0 h; wherein the caliber of the water pipe is phi 25-40 mm, and the flow is 5.0-10.0 m3/h;
And 7, after the moisture in the steel blocks and the blocky slag is dried, sucking out the broken steel blocks from the steel slag by using a lifting magnet, wherein the mass of the steel blocks is the pouring allowance of the tundish.
2. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 1, the liquid level depth of the tundish is measured by a ruler; wherein, the scale has the scale of scale that the scale was made for special high temperature resistant material, its size: the length L is 20-50 mm, the width W is 10-30 mm, and the height H is 1500-2000 mm.
3. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 2, the natural cooling time is 3.0-5.0 h.
4. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 4, the tundish is lifted by a ladle overturning mechanism and then overturned by 180 degrees, and then the solidified steel slag is poured out of a slag yard.
5. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 5, the cooling time is 2.0-4.0 h when the water is artificially injected for cooling.
6. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 6, the steel slag is carefully crushed into blocks by a crushing hammer.
7. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to claim 1, wherein in the step 6, the cooling time is 2.0-3.0 h when the water is artificially injected for cooling.
8. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to the claim 1, wherein in the step 6, the block slag should be as small as possible during crushing to ensure that no steel block exists in the slag, the block slag adsorbed on the steel block is washed away by water, the steel block and the block slag are further cooled, and weighing is started after the steel block is completely cooled.
9. The method for measuring the pouring allowance of the tundish in the continuous casting pouring process according to the claim 1, wherein in the step 7, the method for weighing the steel block comprises the following steps: (1) sucking out all broken steel blocks in the steel slag by using a lifting magnet, putting the steel blocks into a loader, and weighing the steel blocks before the loader is driven to a ground scale; (2) and (3) correcting and resetting the weighbridge, weighing the loader containing the steel block on the weighbridge and recording the weighed steel block as A1, weighing the steel block after the steel block is poured as A2, wherein the difference value of the two is the mass of the steel block, namely the pouring allowance of the tundish is collected at this time.
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CN113523217B (en) * | 2020-04-21 | 2022-09-06 | 上海梅山钢铁股份有限公司 | Method for calibrating continuous casting ladle scale and tundish scale |
CN114769543A (en) * | 2022-04-19 | 2022-07-22 | 重庆钢铁股份有限公司 | Method for observing liquid level height of tundish |
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JPS55117548A (en) * | 1979-03-05 | 1980-09-09 | Nippon Kokan Kk <Nkk> | Preventing method for molten slag effluence |
SE451507B (en) * | 1982-12-06 | 1987-10-12 | Studsvik Energiteknik Ab | PROCEDURE AND DEVICE FOR SURGERY OF THE REMAINING QUANTITY OF MELTED METAL ON THE BOTTOM OR DIFFERENTLY OF A CONTAINER IN CONNECTION WITH THE DISPOSAL OF MELTED METAL FROM THE CONTAINER |
JPS619966A (en) * | 1984-06-27 | 1986-01-17 | Kawasaki Steel Corp | Estimating method of amount of molten steel remaining in ladle |
JPH0767605B2 (en) * | 1987-04-10 | 1995-07-26 | 住友金属工業株式会社 | How to finish casting in continuous casting equipment |
JP2938313B2 (en) * | 1993-06-23 | 1999-08-23 | 新日本製鐵株式会社 | Pouring method at the end of ladle injection |
JPH08224659A (en) * | 1995-02-22 | 1996-09-03 | Nippon Steel Corp | Method for separating molten metal and slag |
JP3632878B2 (en) * | 1996-06-14 | 2005-03-23 | 日立金属株式会社 | Automatic pouring method |
JPH10211559A (en) * | 1997-01-28 | 1998-08-11 | Nippon Steel Corp | Method for continuously casting different kinds of steels and continuous caster suitable to continuous casting of different kinds of steels |
JP5104153B2 (en) * | 2007-09-19 | 2012-12-19 | Jfeスチール株式会社 | Treatment method of joint slab in different steel type continuous casting |
JP5064433B2 (en) * | 2009-03-27 | 2012-10-31 | 新日本製鐵株式会社 | Method, apparatus and program for estimating heat flux on inner surface of container |
CN102019414B (en) * | 2009-09-15 | 2012-12-19 | 鞍钢股份有限公司 | Control method for steel casting end |
KR101299094B1 (en) * | 2010-08-30 | 2013-08-27 | 현대제철 주식회사 | Method for estimating pollution range of molten steel on laddle change |
CN106041011A (en) * | 2016-08-12 | 2016-10-26 | 湖南千盟物联信息技术有限公司 | Implementation method of continuous casting intermediate ladle remaining steel model |
CN206898332U (en) * | 2017-06-26 | 2018-01-19 | 北京首钢股份有限公司 | A kind of device for the remaining measurement of slab tundish casting |
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