CN111957918B - Control method for stabilizing superheat degree of 400VN steel in starting process - Google Patents
Control method for stabilizing superheat degree of 400VN steel in starting process Download PDFInfo
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- CN111957918B CN111957918B CN202010935871.8A CN202010935871A CN111957918B CN 111957918 B CN111957918 B CN 111957918B CN 202010935871 A CN202010935871 A CN 202010935871A CN 111957918 B CN111957918 B CN 111957918B
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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
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
Abstract
The invention discloses a control method for stabilizing the superheat degree of 400VN steel in a starting process, which relates to the technical field of metallurgical production processes, and sets new parameters as follows: selecting a steel ladle with dead time less than or equal to 50 min; ensuring that the temperature of molten steel can meet 1575-1583 ℃ within 6 minutes before the steel ladle is lifted; continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, and ensuring that the difference value of the two temperature measurement results is not more than 3 ℃; starting the jetting and sucking device 30min before casting, wherein the jetting and sucking device is arranged at the lower part of a tundish nozzle and is used for heating the tundish nozzle to prevent the tundish nozzle from being frozen, and the jetting and sucking device turns red 5min after the jetting and sucking device is started; and starting pouring of the whole flow positions of the tundish together, wherein the pouring time interval of each flow position is not more than 1 min. The invention has the beneficial effects that: setting new parameters and adding an injection and suction device for heating a water gap; the success rate that the highest superheat degree is within the range of 35-45 ℃ after the startup is improved, the method realizes stable control of the superheat degree, and is safe, reliable, reasonable in condition and easy to control.
Description
Technical Field
The invention relates to the technical field of metallurgical production processes, in particular to a control method for stabilizing the superheat degree of 400VN steel during starting.
Background
The temperature control of the molten steel is determined by the degree of superheat of the continuous casting. The superheat degree is high, the fluidity of molten steel in a tundish and a crystallizer is facilitated, but the development of casting blank columnar crystals is promoted, so that serious center segregation is caused; the erosion of the stopper rod is serious, and the stopper rod is out of control; the high superheat degree can also cause the thinning of a casting blank shell, increase the risk of leakage and reduce the productivity of the casting machine. The superheat degree is high, secondary oxidation of molten steel is accelerated, the content of gas and impurities in steel is increased, the quality of the molten steel is deteriorated, and the quality of a casting blank is further influenced. On the contrary, if the temperature of the molten steel is too low and the fluidity of the molten steel is poor, the molten steel can be condensed in a ladle and a water gap of a tundish, so that the continuous casting process is interrupted, and the surface quality of a casting blank is also adversely affected.
When the superheat degree of the molten steel is controlled properly, the isometric crystal growth of the casting blank is promoted, the structure of the casting blank is compact, the central segregation and the looseness of the casting blank are reduced, the quality of the casting blank is improved, and the yield of the casting blank is increased. Therefore, the accurate control of the temperature of the molten steel has great influence on ensuring the smooth production, reducing the consumption of raw materials and improving the quality of casting blanks, and plays an important role in the steelmaking production process.
The superheat degree of 400VN steel in a starting process is influenced by baking of a continuous casting tundish, less flow position, LF (ladle furnace) treatment time, ladle heat absorption and the like, and how to accurately control the temperature of molten steel is a technical problem which is difficult to treat all the time. The prior steelmaking technology has the following defects: no stable refining treatment time exists, the heat absorption of the ladle is uncertain, the baking time interval of the ladle is too large, and the heat preservation time is unstable; the superheat degree is unstable due to the reasons, and the difference value of the superheat degree is large under the condition of starting at the same temperature. Meanwhile, when the starting speed is lower than 2.1m/min, the stay time of the molten steel in the tundish is prolonged, and the accident of freezing a water gap is easy to happen. The baking of the tundish nozzle is insufficient, and the nozzle of molten steel is cooled in the early stage of casting.
Disclosure of Invention
The invention provides a control method for stabilizing the superheat degree of 400VN steel in a starting process, and aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
a control method for stabilizing the superheat degree of 400VN steel during starting is characterized in that a ladle is selected and an LF furnace is used for molten steel refining, and then continuous casting is carried out on the refined molten steel; in the molten steel refining, a steel ladle with dead time less than or equal to 50min is selected; before refining, the temperature of the molten steel is higher than the liquidus line of the steel by more than 30 ℃; the refining time of the LF furnace is more than or equal to 18min, the molten steel amount is in the interval of 120-150 t, the aeration time of argon is more than 4min, and the flow is more than or equal to 600 NL/min; ensuring that the temperature of molten steel can meet 1575-1583 ℃ within 6 minutes before the steel ladle is lifted; the time for calming the molten steel after hoisting is less than or equal to 10 min;
in the continuous casting, a roaster is used for roasting the tundish to ensure that the temperature of the tundish needs to reach 1150 +/-50 ℃; after the steel ladle is placed in the continuous casting seat, the casting is started within 10min, and the roaster is removed within 4min before the casting is started; when casting is started, the flow position of the steel ladle is fully opened, so that the tonnage rising rate of the tundish is more than or equal to 7 t/min; when the tundish is weighed to be 10-14t, the whole flow positions of the tundish are poured together, and the pouring time interval of each flow position is not more than 1 min; starting the machine within 1min after starting the rod, wherein the pull speed is more than or equal to 2.3m/min, and the pull speed reaches 2.5m/min before over-pulling and straightening; when the weight of the tundish reaches more than 14 tons, adding 12-30 kg of covering agent into an impact area of the tundish, and adding 12kg of covering agent into each hole of a stopper area; when the weight of the tundish reaches about 30 tons, the molten steel of the tundish is measured manually.
Further, the injection and suction device is opened before the pouring is started for 30min, the injection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the nozzle from being frozen, and the injection and suction device turns red 5min after the injection and suction device is opened.
Furthermore, in the continuous casting, the tundish is checked 40min before casting to ensure that the stopper rod is red and a tundish nozzle is free from foreign matter blockage.
Further, the temperature of the molten steel is continuously measured for 2 times before the steel ladle is covered, the temperature is guaranteed to meet 1575-1583 ℃ within 6 minutes before the molten steel is lifted, and the difference value of the two temperature measurement results is guaranteed not to exceed 3 ℃; then evenly adding not less than 48kg of heat preservation agent for heat preservation, and then covering and hoisting the steel ladle.
Further, baking the tundish for 3-4 hours by using a baking device, wherein the continuous time of the tundish temperature being more than 1000 ℃ is not less than 2 hours, and the continuous time of the tundish temperature reaching more than 1150 ℃ exceeds 1 hour.
From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:
compared with the prior art, the invention sets new parameters:
firstly, a ladle with dead time less than or equal to 50min is selected.
And secondly, ensuring that the temperature of the molten steel can meet 1575-1583 ℃ within 6 minutes before the steel ladle is lifted.
Thirdly, continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, and ensuring that the difference value of the two temperature measurement results is not more than 3 ℃.
And fourthly, an ejection and suction device is added, the ejection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the nozzle from being frozen, the ejection and suction device is opened before the tundish nozzle is poured for 30min, and the ejection and suction device turns red after the tundish nozzle is opened for 5 min.
Fifthly, the full stream positions of the tundish are poured together, and the pouring time interval of each stream position is not more than 1 min.
In conclusion, the invention provides a control method for stabilizing the starting superheat degree of 400VN steel, and provides a method for setting new starting parameters by using a ladle with the dead time less than or equal to 50min and simultaneously adding an injection and suction device for heating a water gap so as to avoid the conditions of freezing the water gap and freezing the steel. Compared with the prior art, the success rate of the highest superheat degree within the range of 35-45 ℃ after the machine is started is increased from 66.4% to 96.8%.
Detailed Description
The invention provides a control method for stabilizing the starting superheat degree of 400VN steel, wherein the steel grade is 400VN, and the liquidus temperature is 1503 ℃.
Example 1: selecting a steel ladle, refining the molten steel by using an LF (ladle furnace), and continuously casting the refined molten steel; in the molten steel refining, a ladle with the dead time of 41min is selected; the temperature of the molten steel before refining is 1562 ℃ which is more than 30 ℃ higher than the liquidus line of the steel grade; the refining time of the LF furnace is 21min, the molten steel amount is 136t, the aeration time of argon is more than 4 minutes, and the flow is more than or equal to 600 NL/min; continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, wherein the temperature of the molten steel is 1577 ℃ and 1578 ℃ respectively within 1min before hoisting; the difference value of the two temperature measurement results is not more than 3 ℃; then 60kg of heat preservation agent is evenly added for heat preservation, and then the steel ladle is covered and lifted. The molten steel is calmed for 6min after the hoisting;
in the continuous casting, a roaster is used for roasting the tundish to ensure that the temperature of the tundish needs to reach 1150 +/-50 ℃; baking the tundish for 3h and 20min by using a baking device, wherein the continuous time of the tundish temperature being more than 1000 ℃ is not less than 2 h, and the continuous time of the tundish temperature reaching more than 1150 ℃ is 1h and 10 min.
The tundish is checked 40min before casting to ensure that the stopper rod is red and the tundish nozzle is free from foreign matter blockage. And opening the injection and suction device 30min before casting, wherein the injection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the tundish nozzle from being frozen, and the injection and suction device turns red 5min after opening.
After the steel ladle is placed in the continuous casting seat, the casting is started within 10min, and the roaster is removed within 4min before the casting is started; when casting is started, the flow position of the steel ladle is fully opened, so that the tonnage rising rate of the tundish is 8 t/min; when the tundish weighs 13t, the full flow positions of the tundish are poured together, and the pouring interval time of each flow position is 40 s; starting up and starting up within 1min after starting the rod, wherein the pulling speed reaches 2.3m/min, the pulling speed reaches 2.5m/min before over-pulling and straightening, and the conveying from pulling and straightening to a cooling bed reaches 2.5 m/min; when the weight of the middle package reaches 15 tons, 12kg of covering agent is added into each hole of the stopper rod area; when the molten steel does not flow through the lower opening of the large ladle sleeve, 12kg of covering agent is added into the impact area of the middle ladle, when the middle ladle is weighed to 29 tons, the molten steel of the middle ladle is manually measured, the periphery of the continuous temperature measuring device is manually measured, the temperature is 1543 ℃, and then the impact area is manually measured, and the temperature is 1554 ℃. The maximum superheat (continuous temperature-liquidus temperature) after casting was 38 ℃. The highest superheat degree is in the range of 35-45 ℃.
Example 2: selecting a steel ladle, refining the molten steel by using an LF (ladle furnace), and continuously casting the refined molten steel; in the molten steel refining, a ladle with the dead time of 36min is selected; the temperature of the molten steel before refining is 1572 ℃ which is more than 30 ℃ of the liquidus line of the steel grade; the refining time of the LF furnace is 33min, the molten steel amount is 132t, the aeration time of argon is more than 4 minutes, and the flow is more than or equal to 600 NL/min; continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, wherein the temperature of the molten steel is 1576 ℃ and 1577 ℃ respectively within 1min before hoisting; the difference value of the two temperature measurement results is not more than 3 ℃; then 60kg of heat preservation agent is evenly added for heat preservation, and then the steel ladle is covered and lifted. The molten steel is calmed for 6min after the hoisting;
in the continuous casting, a roaster is used for roasting the tundish to ensure that the temperature of the tundish needs to reach 1150 +/-50 ℃; baking the tundish for 3h40min by using a baking device, wherein the continuous time of the tundish temperature being more than 1000 ℃ is not less than 2 h, and the continuous time of the tundish temperature reaching more than 1150 ℃ is 1h30 min.
The tundish is checked 40min before casting to ensure that the stopper rod is red and the tundish nozzle is free from foreign matter blockage. And opening the injection and suction device 30min before casting, wherein the injection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the tundish nozzle from being frozen, and the injection and suction device turns red 5min after opening.
After the steel ladle is placed in the continuous casting seat, the casting is started within 10min, and the roaster is removed within 4min before the casting is started; when casting is started, the flow position of the steel ladle is fully opened, so that the tonnage rising rate of the tundish is 9 t/min; when the tundish weighs 14t, the full flow positions of the tundish are poured together, and the pouring interval time of each flow position is 30 s; starting up and starting up within 1min after starting the rod, wherein the pulling speed reaches 2.3m/min, the pulling speed reaches 2.5m/min before over-pulling and straightening, and the conveying from pulling and straightening to a cooling bed reaches 2.5 m/min; when the weight of the middle package reaches 16 tons, 12kg of covering agent is added into each hole of the stopper rod area; when the molten steel does not flow through the lower opening of the large ladle sleeve, 12kg of covering agent is added into the impact area of the middle ladle, when the middle ladle is weighed to 29 tons, the molten steel of the middle ladle is manually measured, the periphery of the position of the continuous temperature measuring device is manually measured, the temperature is 1541 ℃, and then the impact area is manually measured, and the temperature is 1546 ℃. The maximum superheat (continuous temperature-liquidus temperature) after casting was 38 ℃. The highest superheat degree is in the range of 35-45 ℃.
Example 3: selecting a steel ladle, refining the molten steel by using an LF (ladle furnace), and continuously casting the refined molten steel; in the molten steel refining, a ladle with the dead time of 23min is selected; the temperature of the molten steel before refining is 1553 ℃ and is more than 30 ℃ higher than the liquidus line of the steel grade; the refining time of the LF furnace is 28min, the molten steel amount is 138t, the aeration time of argon is more than 4 minutes, and the flow is more than or equal to 600 NL/min; continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, wherein the temperature of the molten steel is 1582 ℃ and 1581 ℃ respectively for two times within 1min before hoisting; the difference value of the two temperature measurement results is not more than 3 ℃; then, 48kg of heat preservation agent is uniformly added for heat preservation, and then the steel ladle is covered and lifted. The molten steel is calmed for 6min after the hoisting;
in the continuous casting, a roaster is used for roasting the tundish to ensure that the temperature of the tundish needs to reach 1150 +/-50 ℃; baking the tundish for 3h10min by using a baking device, wherein the continuous time of the tundish temperature being more than 1000 ℃ is not less than 2 h, and the continuous time of the tundish temperature reaching more than 1150 ℃ is 1h5 min.
The tundish is checked 40min before casting to ensure that the stopper rod is red and the tundish nozzle is free from foreign matter blockage. And opening the injection and suction device 30min before casting, wherein the injection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the tundish nozzle from being frozen, and the injection and suction device turns red 5min after opening.
After the steel ladle is placed in the continuous casting seat, the casting is started within 10min, and the roaster is removed within 4min before the casting is started; when casting is started, the flow position of the steel ladle is fully opened, so that the tonnage rising rate of the tundish is 9 t/min; when the tundish is weighed for 12t, the full flow positions of the tundish are poured together, and the pouring interval time of each flow position is 45 s; starting up and starting up within 1min after starting the rod, wherein the pulling speed reaches 2.3m/min, the pulling speed reaches 2.5m/min before over-pulling and straightening, and the conveying from pulling and straightening to a cooling bed reaches 2.5 m/min; when the weight of the middle package reaches 15 tons, 12kg of covering agent is added into each hole of the stopper rod area; when the molten steel does not flow through the lower opening of the large ladle sleeve, 12kg of covering agent is added into the impact area of the middle ladle, when the middle ladle is weighed to 29 tons, the molten steel of the middle ladle is manually measured, the periphery of the position of the continuous temperature measuring device is manually measured, the temperature is 1536 ℃, and then the impact area is manually measured, and the temperature is 1549 ℃. The maximum superheat (continuous temperature-liquidus temperature) after casting was 41 ℃. The highest superheat degree is in the range of 35-45 ℃.
In the invention, the continuous temperature measuring device obtains continuous temperature measuring temperature, and is positioned between the first stream level and the second stream level of the tundish.
In the invention, the manual temperature measurement is used for verifying whether the continuous temperature measurement device works normally, and the superheat degree is calculated as continuous temperature measurement temperature-liquidus temperature.
The invention provides a control method for stabilizing the starting superheat degree of 400VN steel, which is characterized in that a steel ladle with the dead time less than or equal to 50min is used, new starting parameters are set, and meanwhile, an injection and suction device for heating a water gap is additionally arranged, so that the situations of freezing the water gap and freezing steel are avoided. Compared with the prior art, the success rate of the highest superheat degree within the range of 35-45 ℃ after the machine is started is increased from 66.4% to 96.8%.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (4)
1. A control method for stabilizing the superheat degree of 400VN steel during starting is characterized in that a ladle is selected and an LF furnace is used for molten steel refining, and then continuous casting is carried out on the refined molten steel; the method is characterized in that: in the molten steel refining, a steel ladle with dead time less than or equal to 50min is selected; before refining, the temperature of the molten steel is higher than the liquidus line of the steel by more than 30 ℃; the refining time of the LF furnace is more than or equal to 18min, the molten steel amount is in the interval of 120-150 t, the aeration time of argon is more than 4min, and the flow is more than or equal to 600 NL/min; ensuring that the temperature of molten steel can meet 1575-1583 ℃ within 6 minutes before the steel ladle is lifted; the time for calming the molten steel after hoisting is less than or equal to 10 min;
in the continuous casting, a roaster is used for roasting the tundish to ensure that the temperature of the tundish needs to reach 1150 +/-50 ℃; after the steel ladle is placed in the continuous casting seat, the casting is started within 10min, and the roaster is removed within 4min before the casting is started; when casting is started, the flow position of the steel ladle is fully opened, so that the tonnage rising rate of the tundish is more than or equal to 7 t/min; when the tundish is weighed to be 10-14t, the whole flow positions of the tundish are poured together, and the pouring time interval of each flow position is not more than 1 min; starting the machine within 1min after starting the rod, wherein the pull speed is more than or equal to 2.3m/min, and the pull speed reaches 2.5m/min before over-pulling and straightening; when the weight of the tundish reaches more than 14 tons, adding 12-30 kg of covering agent into an impact area of the tundish, and adding 12kg of covering agent into each hole of a stopper area; when the tundish is weighed to reach about 30 tons, manually measuring the temperature of the molten steel of the tundish;
baking the tundish for 3-4 hours by using a baking device, wherein the continuous time of the tundish temperature being more than 1000 ℃ is not less than 2 hours, and the continuous time of the tundish temperature reaching more than 1150 ℃ exceeds 1 hour.
2. The control method for stabilizing the starting superheat degree of 400VN steel according to claim 1, wherein the control method comprises the following steps: and opening the injection and suction device 30min before casting, wherein the injection and suction device is arranged at the lower part of the tundish nozzle and used for heating the tundish nozzle to prevent the tundish nozzle from being frozen, and the injection and suction device turns red 5min after opening.
3. The control method for stabilizing the starting superheat degree of 400VN steel according to claim 1, wherein the control method comprises the following steps: in the continuous casting, the tundish is checked 40min before casting to ensure that the stopper rod is red and a tundish nozzle is free from foreign matter blockage.
4. The control method for stabilizing the starting superheat degree of 400VN steel according to claim 1, wherein the control method comprises the following steps: continuously measuring the temperature of the molten steel for 2 times before covering the steel ladle, ensuring that the temperature of the molten steel meets 1575-1583 ℃ within 6 minutes before lifting, and ensuring that the difference value of the two temperature measurement results does not exceed 3 ℃; then evenly adding not less than 48kg of heat preservation agent for heat preservation, and then covering and hoisting the steel ladle.
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