CN112296293B - Method for changing section in casting of double-flow slab continuous casting machine - Google Patents
Method for changing section in casting of double-flow slab continuous casting machine Download PDFInfo
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- CN112296293B CN112296293B CN202010954052.8A CN202010954052A CN112296293B CN 112296293 B CN112296293 B CN 112296293B CN 202010954052 A CN202010954052 A CN 202010954052A CN 112296293 B CN112296293 B CN 112296293B
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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
Abstract
The invention provides a method for changing a cross section in casting of a double-flow slab continuous casting machine, which comprises the following steps: stopping one flow in the production process by utilizing the pouring characteristic of the double-flow plate blank, and increasing the pulling speed by using the other flow to maintain production; the size of a dummy bar head is changed in advance before stopping the flow of the production, the dummy bar is sent while the section of the crystallizer is adjusted in a cold state after the flow is stopped and the tail billet is discharged, a gap between the dummy bar head and the copper plate of the crystallizer is plugged after the dummy bar is in place, and the flow is opened in a new flow or in the next tundish after the tundish is replaced. The invention can realize the continuous casting customized production of the plate blank with arbitrary section transformation and zero transition wedge-shaped blank length within the allowable range of equipment.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to the field of continuous casting, and particularly relates to a method for changing a cross section in casting of a double-flow slab continuous casting machine.
Background
The plate in the steel product is used as a raw material in the industries of automobiles, household appliances, shipbuilding, pipe making and the like, and the customization of the plate can provide products with high utilization rate, low inventory and multiple specifications for steel enterprises, reduce the cost of steel downstream enterprises and improve the competitiveness. The customization of the plate depends on the continuous casting customization of the plate blank, and in order to realize the continuous casting customization of the plate blank, the steel enterprises at home and abroad adopt the crystallizer on-line width adjusting technology at present.
The main foreign research and application of the crystallizer on-line width adjusting technology comprises the following steps: (1) a CSP-RAM crystallizer width and taper adjusting system of Germany Simmark; (2) a compact online crystallizer width adjusting system HYDROWN developed by the Austenite steel union; (3) an IN-MO crystallizer width adjusting system of Daniely; (4) the crystallizer of Nippon Tekken iron is a high-speed width-and-taper system NS-VWM. The research and application of the on-line width adjusting technology of domestic and foreign crystallizers relieve partial requirements of continuous casting and customization of plate blanks. But there are also significant problems: the single section transformation in a continuous production state is limited, the requirement of ultra-large section transformation cannot be met, and the domestic introduction of a new-day high-speed width adjusting system NS-VWM can only realize the maximum single width adjustment of 150mm, and the width adjustment is finished by multiple times when the width exceeds 150 mm; the transition wedge-shaped blank is too long, the transition wedge-shaped blank with the cross section of 100mm needs to be changed in actual production, 1m of transition wedge-shaped blank waste products are generated, and the transition wedge-shaped blank is longer when the cross section is changed more.
In summary, the following problems exist in the prior art: the single section transformation in the slab continuous casting production state is limited, and the requirement of ultra-large section transformation cannot be met.
Disclosure of Invention
The invention provides a method for changing a section in casting of a double-flow slab continuous casting machine, which aims to solve the problems that single section change in a slab continuous casting state is limited and the requirement of oversized section change cannot be met.
Therefore, the invention provides a method for changing a cross section in casting of a double-flow slab continuous casting machine, which comprises the following steps:
stopping one flow in the production process by utilizing the pouring characteristic of the double-flow plate blank, and increasing the pulling speed by using the other flow to maintain production; the size of a dummy bar head is changed in advance before stopping the flow of the production, the dummy bar is sent while the section of the crystallizer is adjusted in a cold state after the flow is stopped and the tail billet is discharged, a gap between the dummy bar head and the copper plate of the crystallizer is plugged after the dummy bar is in place, and the flow is opened in a new flow or in the next tundish after the tundish is replaced.
Further, the method for changing the cross section in the casting of the double-flow slab continuous casting machine specifically comprises the following steps:
step A: before stopping the flow, the head of the first-flow dummy bar ready for stopping the production is adjusted to the size of the next section ready for production, and the dummy bar is ready to be arranged again;
and B: after one flow is stopped successfully and the ending operation is started in production, the pulling speed of the other flow is increased to the upper limit allowed by the steel grade and the temperature to maintain production;
and C: in a tail billet mode of the continuous casting machine, the number of times of production stop is adjusted to be the next production section in a cold state, and after a casting blank is completely pulled out of the continuous casting machine, an upper dummy ingot is restarted; after the dummy bar reaches the lower opening of the crystallizer and stops, the dummy bar is fed into the crystallizer in a manual mode; if the head of the dummy bar is not aligned with the crystallizer, the dummy bar head is guided to enter 50 percent of the length of the crystallizer by using a steel pipe;
step D: after the crystallizer is in place, filling gaps between the dummy bar head and the crystallizer copper plate by using asbestos ropes to prevent molten steel from flowing in; covering all the asbestos ropes, and scattering a layer of steel particles on the surface of a dummy ingot head in the crystallizer to accelerate the solidification of molten steel during starting;
step E: and after the flow is opened again in the pouring process or the tundish is replaced and the flow is opened again, the slab continuous casting customized production with arbitrary section transformation and zero transition wedge-shaped slab length within the allowable range of the double-flow slab continuous casting machine is realized.
Further, a flat steel sheet with the width of 30-40 mm and the thickness of 3-5 mm is used for covering all the plugged asbestos ropes.
Further, a steel pipe with the length of 1-2 m is used for guiding the dummy bar head to enter 50% of the length of the crystallizer.
Further, the method for changing the cross section in the casting of the double-flow slab casting machine further comprises the following steps: a method for safely stopping a twin strand slab caster during casting occurring prior to step a, said method comprising:
the superheat degree of a tundish in the furnace before the stopping of the flow and the stopping of the flow is above 30 ℃, so that the condition that cold steel and a stopper rod at the bowl part of a water feeding port cannot be closed is avoided;
stopping the flow in the middle and later period of ladle pouring, gradually reducing the pulling speed by 0.05m/min for each flow time to be stopped when the quantity of the ladle molten steel is 30 percent, and reducing the pulling speed to 0.2-0.3 m/min when the ladle molten steel is completely poured;
the planned stopping heat is that after the pouring of the large ladle is finished, the new large ladle is not poured before the new large ladle is rotated to the pouring position; plan to stop production flow and maintain the pulling speed of 0.1-0.3 m/min, the other flow maintains the normal pulling speed, when the liquid level height of the molten steel of the tundish is reduced to 50% of the normal production height, the stopper rod is closed, and the tundish safety stopper for stopping the flow of the double-flow slab caster is used for stopping the production of the low-pulling-speed flow;
the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine is blocky and can be movably arranged below the upper nozzle of the tundish, and when the flow needs to be stopped, the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine moves below the upper nozzle to block molten steel from flowing into a gap between the upper nozzle and the lower nozzle.
Further, the external shape of the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine is the same as the shape of the lower water gap;
the tundish safety plug for the flow stopping of the double-flow slab continuous casting machine comprises: the device comprises a top plate, a supporting clamping table connected below the top plate, and a contraction part connected below the supporting clamping table;
the top surface is in contact with the water feeding port and is positioned on the top plate of the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine;
a round hole is arranged in the middle of the top surface, the round hole is a blind hole, the diameter of the round hole is larger than that of a corresponding tundish water feeding port,
the easily-melting cover is arranged in the round hole and is made of a material with the melting point lower than 500 ℃;
and the elastic refractory material layer is connected below the easily-melting cover and is positioned in the round hole.
The invention utilizes the pouring characteristic of the double-flow slab, stops one flow in the production process, and improves the pulling speed by the other flow to maintain the production. The size of the dummy bar head can be changed in advance before stopping the production, and the dummy bar is sent while the section of the crystallizer is adjusted in a cold state after stopping the production and finishing the discharging of the tail blank. After the dummy ingot is in place, a gap between the dummy ingot head and the copper plate of the crystallizer is plugged, and new flow is opened or the flow is opened in the next tundish after the tundish is replaced, so that the continuous casting and customized production of the slab with arbitrary section change and zero transition wedge-shaped slab length in the allowable range of equipment can be realized.
Furthermore, the safe flow stopping method of the invention ensures that the tundish of the double-flow slab caster can safely stop the casting flow production in a high liquid level state of more than 50 percent. The molten steel can be concentrated in the tundish upper nozzle and solidified through the tundish lower nozzle safety plug, the molten steel is prevented from flowing into a gap between the upper nozzle and the lower nozzle, and conditions are provided for safety maintenance.
Drawings
FIG. 1 is a schematic view of a tundish safety plug used in the present invention;
FIG. 2 is a schematic view of the structure of a tundish safety plug used in the present invention when it reaches the tundish upper nozzle, and the fusible cover is not yet burned;
fig. 3 is a schematic structural diagram of the tundish safety plug adopted by the invention after reaching the tundish upper nozzle and the easily-melted cover is burnt.
The reference numbers illustrate:
1. a tundish safety plug; 2. a water feeding port; 10. a top plate; 20. a layer of resilient refractory material; 30. the cover is easy to melt; 40. supporting the clamping table; 50. a constriction.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
Taking a converter with the steel tapping quantity of 150t and a double-flow slab caster with the cross section of 220mm multiplied by 1250mm and 220mm multiplied by 800mm as examples, the cross section is changed from 220mm multiplied by 800mm to 220mm multiplied by 1350mm after the flow stopping, and no transition wedge-shaped slab operation is adopted, the method for changing the cross section in the casting of the double-flow slab caster comprises the following steps:
(1) before stopping the flow, the head of the dummy bar which is ready to stop producing the first flow is adjusted by 220mm multiplied by 1350mm and is ready for leading up again.
(2) And increasing the pulling speed of the other flow to the allowable upper limit of the steel grade and the temperature to maintain the production.
(3) In a tail billet mode of the continuous casting machine, the number of times of production stop is adjusted to be a section of 220mm multiplied by 1350mm in a cold state, and after a casting blank is completely pulled out of the continuous casting machine, an ingot is restarted; and after the dummy bar reaches the lower opening of the crystallizer and stops, the dummy bar is sent to 50 percent of the length of the crystallizer by using a manual mode.
(4) After the crystallizer is in place, filling gaps between the dummy bar head and the crystallizer copper plate by using asbestos ropes to prevent molten steel from flowing in; and (3) using flat steel sheets with the width of 30-40 mm, the thickness of 3-5 mm and different lengths to completely cover the plugged asbestos ropes, and scattering a layer of steel particles on the surface of a dummy ingot head in the crystallizer to accelerate the solidification of molten steel during starting.
(5) When the tundish is replaced, the flow is opened again to produce 220mm multiplied by 1350mm, namely, the cross section is changed from 220mm multiplied by 800mm to 220mm multiplied by 1350mm without transition wedge-shaped blank.
The method for changing the cross section in the casting of the double-flow slab continuous casting machine further comprises the following steps: a method for safely stopping a continuous casting machine for double-flow slabs before step A during casting, which is an operation method for planned stopping of a tundish high liquid level in a casting state, and comprises the following steps:
(1) the superheat degree of the tundish in the previous furnace before the flow stopping and the flow stopping furnace times is above 30 ℃, and the phenomenon that the tundish temperature is too low, the bowl part of the water feeding port is cooled, and the stopper rod cannot be closed is avoided.
(2) And the flow stopping operation is performed in the middle and later period of ladle pouring, the pulling speed is gradually reduced by 0.05m/min for the flow times ready for flow stopping when the quantity of the ladle molten steel is 30%, and the pulling speed is reduced to 0.2-0.3 m/min when the ladle molten steel is completely poured, and if the stopper cannot be closed in the speed reduction process and the steel flow cannot be controlled, the flow stopping operation is abandoned.
(3) The planned stopping heat is that after the pouring of the large ladle is finished, the new large ladle is not poured before the new large ladle is rotated to the pouring position; and (3) stopping the production flow for maintaining the pulling speed of 0.1-0.3 m/min, maintaining the normal pulling speed of the other flow, and closing the stopper rod and stopping the low-pulling-speed flow production by using the safety stopper of the tundish when the liquid level of the molten steel of the tundish is reduced to 50% of the normal production height. Therefore, the safe flow stopping of the low-pulling-speed flow under the condition of small ferrostatic pressure can be ensured, and the pollution of the normal production flow caused by the inclusion of the tundish slag to the molten steel can also be avoided.
The tundish safety plug for stopping the flow of the double-flow slab continuous casting machine is blocky and can be movably arranged below the upper nozzle of the tundish, and when the flow needs to be stopped, the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine moves below the upper nozzle to block molten steel from flowing into a gap between the upper nozzle and the lower nozzle.
The safe flow stopping method for the double-flow slab continuous casting machine in the casting process can enable molten steel to be concentrated in the upper water gap of the tundish and solidified, prevent the molten steel from flowing into a gap between the upper water gap and the lower water gap and provide conditions for secondary flow opening. The invention can ensure that the tundish of the double-flow slab caster can safely stop casting production in a high liquid level state of more than 50 percent.
As shown in fig. 1, 2 and 3, the tundish safety plug (also referred to as a safety plate) includes: a top plate 10, a support chuck 40 connected below the top plate, and a contraction part 50 connected below the support chuck; the supporting clamping table 40 is used for supporting the top plate 10 on the same plane of the lower nozzle or fixing the top plate 10 below the upper nozzle, and the contraction part 50 is used for fixing the safety plug to prevent the safety plug from shaking;
the top surface contacted with the water feeding port is positioned on the top plate 10 of the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine;
the middle part of the top surface is provided with a round hole which is a blind hole, and the diameter of the round hole is larger than that of a corresponding tundish water feeding port so as to ensure that the inner hole of the water feeding port is covered;
the easily-melting cover 30 is arranged in the round hole and is made of a material with the melting point lower than 500 ℃;
and the elastic refractory material layer 20 is connected below the easily-melting cover and positioned in the circular hole, and except the easily-melting cover 30 and the elastic refractory material layer 20, the material of the base body of the tundish safety plug (also called a safety plate) is a common refractory material (for example, an aluminum-carbon refractory material).
Further, the upper surface of the fusible cover is flush with the top surface.
Furthermore, the easily-melted cover is a plastic cover, so that the easily-melted cover is convenient to manufacture, install and use, reasonable in melting process and low in cost.
The appearance of middle package safety stopper (also called safety plate) is similar with the lower mouth of a river of half middle package that has the base, and there is a round hole at the middle part of middle package safety stopper, and the round hole diameter should be 10 ~ 20mm bigger than corresponding middle package mouth of a river diameter of supplying water, and the round hole degree of depth is 20 ~ 30mm and ensures that the middle package mouth of a river corrodes the hole enlargement or the safety plate centering also can cover the hole of the mouth of a river completely when not good.
The base body of the tundish safety plug is made of a refractory material, the plane in contact with the water feeding port is made of a high-temperature-resistant and wear-resistant material, the round hole is divided into two layers, the first layer is a plastic cover with the thickness of 1-2 mm, and the plastic cover is positioned through 4 small holes in the round hole and covers the refractory material on the second layer; the second layer is closely-compressed and elastic refractory material (high-temperature cellucotton or asbestos rope), and the safety plate is installed in the preparation position of pouring basket lower nozzle mechanism during production, and roof 10 is in the coplanar with the roof of lower nozzle, and hydraulic cylinder pushes the safety plate to the production position when preparing to finish production, replaces the high temperature of lower nozzle position back and burns out the plastic cover, and elastic refractory material will upwards expand and hinder the gap between molten steel inflow upper and lower nozzle.
Furthermore, the safe flow stopping method of the invention ensures that the tundish of the double-flow slab caster can safely stop the casting flow production in a high liquid level state of more than 50 percent. The molten steel can be concentrated in the tundish upper nozzle and solidified through the tundish lower nozzle safety plug, the molten steel is prevented from flowing into a gap between the upper nozzle and the lower nozzle, and conditions are provided for safety maintenance.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A method for changing a cross section in casting of a double-flow slab casting machine is characterized by comprising the following steps of:
stopping one flow in the production process by utilizing the pouring characteristic of the double-flow plate blank, and increasing the pulling speed by using the other flow to maintain production; changing the size of a dummy bar head in advance before stopping the flow of the production, stopping the flow, adjusting the section of the crystallizer while feeding the dummy bar in a cold state after the tail billet is discharged, plugging a gap between the dummy bar head and a copper plate of the crystallizer after the dummy bar is in place, and opening the flow again or opening the flow in the next tundish after the tundish is changed;
the method for changing the cross section in the casting of the double-flow slab continuous casting machine specifically comprises the following steps:
step A: before stopping the flow, the head of the first-flow dummy bar ready for stopping the production is adjusted to the size of the next section ready for production, and the dummy bar is ready to be arranged again;
and B: after one flow is stopped successfully and the ending operation is started in production, the pulling speed of the other flow is increased to the upper limit allowed by the steel grade and the temperature to maintain production;
and C: in a tail billet mode of the continuous casting machine, the number of times of production stop is adjusted to be the next production section in a cold state, and after a casting blank is completely pulled out of the continuous casting machine, an upper dummy ingot is restarted; after the dummy bar reaches the lower opening of the crystallizer and stops, the dummy bar is fed into the crystallizer in a manual mode; if the head of the dummy bar is not aligned with the crystallizer, the dummy bar head is guided to enter 50 percent of the length of the crystallizer by using a steel pipe;
step D: after the crystallizer is in place, filling gaps between the dummy bar head and the crystallizer copper plate by using asbestos ropes to prevent molten steel from flowing in; covering all the asbestos ropes, and scattering a layer of steel particles on the surface of a dummy ingot head in the crystallizer to accelerate the solidification of molten steel during starting;
step E: after opening flow again or replacing a tundish for opening flow again in the pouring process, realizing the slab continuous casting customized production with arbitrary section transformation and zero transition wedge-shaped slab length within the allowable range of the double-flow slab continuous casting machine;
the method for changing the cross section in the casting of the double-flow slab continuous casting machine further comprises the following steps: a method for safely stopping a twin strand slab caster during casting occurring prior to step a, said method comprising:
the superheat degree of a tundish in the furnace before the stopping of the flow and the stopping of the flow is above 30 ℃, so that the condition that cold steel and a stopper rod at the bowl part of a water feeding port cannot be closed is avoided;
stopping the flow in the middle and later period of ladle pouring, gradually reducing the pulling speed by 0.05m/min for each flow time to be stopped when the quantity of the ladle molten steel is 30 percent, and reducing the pulling speed to 0.2-0.3 m/min when the ladle molten steel is completely poured;
the planned stopping heat is that after the pouring of the large ladle is finished, the new large ladle is not poured before the new large ladle is rotated to the pouring position; plan to stop production flow and maintain the pulling speed of 0.1-0.3 m/min, the other flow maintains the normal pulling speed, when the liquid level height of the molten steel of the tundish is reduced to 50% of the normal production height, the stopper rod is closed, and the tundish safety stopper for stopping the flow of the double-flow slab caster is used for stopping the production of the low-pulling-speed flow;
the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine is blocky and can be movably arranged below the upper nozzle of the tundish, and when the flow needs to be stopped, the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine moves below the upper nozzle to block molten steel from flowing into a gap between the upper nozzle and the lower nozzle.
2. The method for changing the cross section in casting of the double-flow slab caster as claimed in claim 1, wherein the stuffed asbestos cord is covered with a flat steel sheet with the width of 30-40 mm and the thickness of 3-5 mm.
3. The method of claim 1, wherein the dummy bar head is introduced into the mold at 50% of the length of the mold by a steel pipe 1-2 m long.
4. The method of claim 1, wherein the external shape of the tundish safety plug for the dual strand slab caster flow stoppage is the same as the shape of the downcomer;
the tundish safety plug for the flow stopping of the double-flow slab continuous casting machine comprises: the device comprises a top plate, a supporting clamping table connected below the top plate, and a contraction part connected below the supporting clamping table;
the top surface is in contact with the water feeding port and is positioned on the top plate of the tundish safety plug for stopping the flow of the double-flow slab continuous casting machine;
a round hole is arranged in the middle of the top surface, the round hole is a blind hole, the diameter of the round hole is larger than that of a corresponding tundish water feeding port,
the easily-melting cover is arranged in the round hole and is made of a material with the melting point lower than 500 ℃;
and the elastic refractory material layer is connected below the easily-melting cover and is positioned in the round hole.
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| US4506724A (en) * | 1980-03-19 | 1985-03-26 | Cledid S.A. | Ingot mold with adjustable dimensions for a continuous casting machine |
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| CN102699292A (en) * | 2012-06-08 | 2012-10-03 | 中冶赛迪电气技术有限公司 | Method for thermally adjusting width of crystallizer and crystalline wedge-shaped blank of crystallizer |
| CN103567409A (en) * | 2012-08-03 | 2014-02-12 | 山西太钢不锈钢股份有限公司 | Method for on-line width adjusting of continuous casting |
| CN105983674A (en) * | 2015-02-28 | 2016-10-05 | 宝山钢铁股份有限公司 | Automatic on-line width adjustment control system for continuous casting and process control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4506724A (en) * | 1980-03-19 | 1985-03-26 | Cledid S.A. | Ingot mold with adjustable dimensions for a continuous casting machine |
| CN102294455A (en) * | 2010-06-28 | 2011-12-28 | 宝山钢铁股份有限公司 | Non-stopped-pouring high-speed short-edge width regulating method of slab continuous casting machine crystallizer |
| CN102699292A (en) * | 2012-06-08 | 2012-10-03 | 中冶赛迪电气技术有限公司 | Method for thermally adjusting width of crystallizer and crystalline wedge-shaped blank of crystallizer |
| CN103567409A (en) * | 2012-08-03 | 2014-02-12 | 山西太钢不锈钢股份有限公司 | Method for on-line width adjusting of continuous casting |
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Effective date of registration: 20220825 Address after: 545002, 117 North Bird Road, the Guangxi Zhuang Autonomous Region, Liuzhou Patentee after: Liuzhou Iron&Steel Co.,Ltd. Patentee after: GUANGXI LIUZHOU IRON AND STEEL GROUP Co.,Ltd. Address before: 545002, 117 North Bird Road, the Guangxi Zhuang Autonomous Region, Liuzhou Patentee before: Liuzhou Iron&Steel Co.,Ltd. |