CN114799108A - Casting starting control method for small square billet casting machine - Google Patents
Casting starting control method for small square billet casting machine Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002893 slag Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052802 copper Inorganic materials 0.000 claims abstract description 28
- 239000010949 copper Substances 0.000 claims abstract description 28
- 235000019484 Rapeseed oil Nutrition 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000003111 delayed effect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 43
- 239000010959 steel Substances 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 abstract description 11
- 230000001050 lubricating effect Effects 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000009749 continuous casting Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B22D11/166—Controlling or regulating processes or operations for mould oscillation
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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
- B22D11/07—Lubricating the moulds
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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
-
- 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
- B22D11/188—Controlling or regulating processes or operations for pouring responsive to thickness of solidified shell
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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
Abstract
The invention provides a control method for starting casting of a small square billet casting machine, and relates to the technical field of steel making. The method comprises the following steps: the amplitude of the crystallizer is increased to at least +/-5 mm, so that the covering slag can be melted as early as possible during casting, liquid slag with good heat conduction and lubrication is formed, and the negative slip rate is increased; when the small square billet casting machine starts casting, the amount of cold water of the foot roller II is opened to the maximum, the preset time is kept, and the water amount is gradually recovered to the normal water amount, so that the primary green billet head is cooled with enough strength, and the ingot guiding flash is prevented; when casting and feeding the dummy ingot, stopping the dummy ingot head at a position which is more than 300mm away from the lower opening of the crystallizer, prolonging the waiting time of the primary blank head on the copper pipe as far as possible, and reducing the blank drawing resistance; the mixed liquid of graphite powder and rapeseed oil is smeared on the copper pipe wall of the crystallizer, so that the lubricating effect is improved, and the lubricating property between the blank shell and the copper pipe wall is improved; the seedling emergence time is controlled to be delayed to 12s at least for starting, the thickness of the primary shell is ensured, the tensile strength is improved, and the shell is prevented from being cracked.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a method for controlling the start of casting of a small square billet casting machine.
Background
In order to improve the productivity of a billet caster and improve the internal and surface quality of a casting head billet, many steel mills begin to research how to improve the casting starting drawing speed of the billet caster, wherein the starting drawing speed refers to the speed of starting a withdrawal straightening machine to withdraw billets when the caster begins to draw the steel.
By improving the starting pulling speed of the withdrawal and straightening machine, the molten steel of the casting head furnace is stably connected with the molten steel of the process furnace, so that the temperature of the molten steel of the casting first furnace is reduced, the casting blank quality of the casting furnace is ensured, the scrap cutting amount of the head blank is reduced, and the purposes of low-temperature quick drawing, cost reduction and efficiency improvement of a continuous casting machine are smoothly achieved.
In the cast-on production of an actual continuous casting machine, the starting pulling speed of each billet continuous casting machine is inconsistent due to various reasons, even the starting pulling speed of different casting flows is different due to different operation habits or levels of operators on the same machine, so that the production efficiency of different continuous casting machines cannot be ensured.
After the continuous casting machine of Shaosao steel is put into operation, the thread steel is produced mainly, and through several times of upgrading and reconstruction, the annual steel production is close to 260 ten thousand t, but the casting starting drawing speed is only 0.5-0.8 m/min. Along with market changes, a continuous casting machine for producing deformed steel bars is required to keep efficiency priority, and the improvement of casting starting and pulling speed of the continuous casting machine is urgent.
Disclosure of Invention
The invention aims to provide a control method for the casting start of a small square billet casting machine, which can improve the casting start pulling speed of the small square billet casting machine and improve the production efficiency.
Embodiments of the invention may be implemented as follows:
the invention provides a small square billet casting machine casting starting control method, which comprises the following steps:
increasing the amplitude of the crystallizer to at least +/-5 mm;
when the small square billet casting machine starts casting, the amount of cold water of the foot roll II is opened to the maximum, the preset time is kept, and then the water amount is gradually recovered to the normal water amount;
when casting and feeding the dummy ingot, stopping the dummy ingot head at a position which is more than 300mm away from the lower opening of the crystallizer;
smearing a mixed solution of graphite powder and rapeseed oil on the copper pipe wall of the crystallizer;
the emergence time is controlled to be delayed at least until 12s is started.
The method for controlling the casting start of the billet caster provided by the embodiment has the beneficial effects that:
1. the amplitude of the crystallizer is increased to +/-5 mm at least from the original +/-4 mm, the covering slag can be melted as early as possible during casting, liquid slag with good heat conduction and lubrication is formed, the negative slip rate is increased, the liquid slag is promoted to form and flow into a gap between a blank shell and a copper wall, the heat conduction and the lubrication performance are improved, and the demoulding of a primary blank shell is promoted;
2. the water quantity of the foot roll of the crystallizer is changed from the water quantity which is matched with the corresponding water quantity according to the pulling speed in the prior art, the cold water quantity of the foot roll is instantly opened to the maximum when the crystallizer starts, and after the preset time is kept, the cold water quantity is gradually restored to a normal value (namely, the cold water quantity is matched with the pulling speed at the time), so that the primary blank head is cooled with enough strength, and the flash of a dummy ingot (the cooling of the blank head is insufficient, and molten steel overflows);
3. when casting and feeding the dummy ingot, stopping the dummy ingot head at a position away from the lower opening of the crystallizer, and increasing the height to be more than 300mm, so that the waiting time of the nascent billet head on a copper pipe is prolonged as much as possible, and simultaneously, the billet drawing resistance is reduced;
4. only coating rapeseed oil before the copper pipe wall of the crystallizer, in order to ensure the lubricity of the rapeseed oil, graphite powder is added into the rapeseed oil, so that the lubricating effect is further improved, and the lubricity between the blank shell and the copper pipe wall is improved;
5. controlling the seedling emergence time, and starting from original 8s to 12s at least, ensuring the thickness of the primary shell, improving the tensile strength, and preventing the shell from being pulled and cracked;
6. through the measures, the high-pull-speed starting process is basically realized, better economic benefit is created, and no negative influence is caused on safety and environmental protection.
In an optional embodiment, in the mixed liquid of the graphite powder and the rapeseed oil, the weight proportion of the graphite powder is controlled within a range of 30-40%.
In an optional embodiment, in the mixed liquid of the graphite powder and the rapeseed oil, the weight ratio of the graphite powder to the rapeseed oil is 3: 7.
In an alternative embodiment, the preset duration is: 12s to 18 s.
In an optional embodiment, the method for controlling the start of casting of the billet caster further comprises the following steps:
and when the dummy ingot is sealed, putting into use a dummy ingot box, and fixing the added cold steel material in the dummy ingot box.
Therefore, when the dummy ingot is sealed, the dummy ingot box is put into use, the added cold steel material is fixed in the dummy ingot box, the cold steel material is ensured not to be contacted with the wall of the crystallizer, and the resistance of starting and pulling the primary head blank is reduced.
In an alternative embodiment, the step of stopping the dummy bar head at a position more than 300mm from the lower mouth of the mold when starting the casting of the dummy bar comprises:
when casting and feeding the dummy ingot, stopping the dummy ingot head at a position 400mm away from the lower opening of the crystallizer.
In an optional embodiment, the method for controlling the start of casting of the billet caster further comprises the following steps:
and after the casting flow starts, adding protective slag into the primary blank shell in the crystallizer in advance to melt slag in advance.
Therefore, after the casting flow starts, a proper amount of covering slag is added into the primary blank shell in the crystallizer in advance to melt the slag in advance, liquid slag is formed earlier, and the lubrication of the blank shell is promoted.
In an optional embodiment, after the casting flow starts, the step of adding mold flux to the primary blank shell in the crystallizer in advance to melt the slag in advance comprises the following steps:
pouring a first molten steel flow, pressing a plug 2/3, keeping the first time for a first time, adjusting the molten steel flow to a trickle, and adding a first part of the covering slag after stabilizing the trickle for a second time;
and adding the residual covering slag when the molten steel in the crystallizer rises to a position away from the upper opening of the copper pipe of the crystallizer by a preset distance.
In an alternative embodiment, the step of pouring the first stream of steel against the stopper 2/3, adjusting the stream of steel to a stream after the first period of time, and after the stream of steel has stabilized for a second period of time, adding the first portion of mold flux comprises:
and (3) pouring a first molten steel flow, pressing the stopper opening rod 2/3, keeping for 2-4 s, adjusting the molten steel flow to a trickle, stabilizing the trickle for 1-3 s, and adding 50-100 g of covering slag.
In an alternative embodiment, the step of adding the remaining mold flux when the molten steel in the mold rises to a position spaced apart from an upper opening of a copper pipe of the mold by a predetermined distance includes:
when the molten steel in the crystallizer rises to a position 400mm away from the upper opening of a copper pipe of the crystallizer, the residual covering slag is added.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a start control method of a billet caster according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, in order to solve the problem that the starting pulling speed of the continuous casting machine is low, an embodiment of the present invention provides a method for controlling the start of casting of a billet caster, which mainly improves the following two aspects:
firstly, corresponding parameter optimization is carried out on the existing starting related equipment;
secondly, the existing operation process is correspondingly adjusted.
On the first hand, corresponding parameter optimization is carried out on the existing equipment relevant to starting, and the head cooling effect of a casting blank is improved, and the casting starting control method of the billet caster provided by the embodiment comprises the following steps:
s1: the amplitude of the crystallizer is increased to at least + -5 mm.
Specifically, in order to melt the mold flux as soon as possible during casting to form liquid slag with good heat conduction and lubrication, the amplitude of the crystallizer is increased to at least +/-5 mm from the original +/-4 mm, preferably, the amplitude of the crystallizer is increased to +/-5 mm, +/-6 mm, +/-7 mm or +/-8 mm, in this embodiment, the amplitude of the crystallizer is increased to +/-5 mm, the negative slip rate is increased, the liquid slag is promoted to be formed, and the liquid slag flows into a gap between a blank shell and a copper wall, so that the heat conduction and the lubrication are improved, and the demolding of a primary blank shell is promoted.
S2: when the small square billet casting machine starts casting, the amount of the secondary cooling water of the foot roll is opened to the maximum, the preset time is kept, and then the water amount is gradually recovered to the normal water amount.
Specifically, the water amount of the foot roller of the crystallizer is changed from the original water amount matched with the corresponding water amount according to the pulling speed, the water amount of the second cooling water of the foot roller is instantaneously opened to the maximum when the crystallizer starts, and the preset time is kept, wherein the preset time can be 15s, 16s, 17s or 18s in the embodiment, the preset time is 15s, and the normal value is gradually recovered (namely the preset time is converted to be matched with the pulling speed at the time), so that the primary blank head is cooled with enough strength, and the flash of a dummy ingot (the blank head is not cooled enough, and molten steel overflows and flows out) is prevented.
Wherein, the secondary cold water quantity of the foot roller is instantly opened to the maximum when starting, and the maximum water quantity is related to the size of the nozzle, the pressure of the secondary cold water, the flow of the main pipe and the like. And gradually recovering to normal water volume, wherein the normal water volume is mainly matched with the pulling speed, and the normal water volume is larger as the pulling speed is higher.
In the second aspect, the continuous casting machine adopts high pulling speed starting, so that the time of a primary billet head on a copper pipe is inevitably shortened, the starting and billet drawing resistance is very large in the moment, and then a primary billet shell is easily pulled out of the crystallizer, and meanwhile, the primary billet shell is thin, weak in tensile strength and easy to crack.
In contrast, the method for controlling the start of casting of the billet caster provided by the embodiment comprises the following steps, and the method is authenticated in the actual start of casting at a high casting speed, and has an obvious effect.
S3: when casting and feeding the dummy ingot, stopping the dummy ingot head at a position which is more than 300mm away from the lower opening of the crystallizer.
Specifically, when the dummy ingot is poured, the dummy ingot head is stopped at a position which is more than 300mm away from the lower opening of the crystallizer, and preferably, the distance can be 400mm, 450mm or 500 mm. In the embodiment, when the casting is started and the dummy ingot is fed, the dummy ingot head is stopped at the position away from the lower opening of the crystallizer, the distance from the original 300mm to the lower opening of the crystallizer is increased to 400mm, the waiting time of the primary blank head on a copper pipe is prolonged as far as possible, and simultaneously the blank drawing resistance is reduced.
S4: and smearing the mixed liquid of graphite powder and rapeseed oil on the copper pipe wall of the crystallizer.
Specifically, only smearing rapeseed oil before the copper pipe wall of the crystallizer, in order to ensure the lubricity of the rapeseed oil, graphite powder is added into the rapeseed oil, so that the lubricating effect is further improved, and the lubricity between the blank shell and the copper pipe wall is improved. Wherein, the weight ratio range of the graphite powder can be controlled between 30 percent and 40 percent, preferably, the weight ratio of the graphite powder to the rapeseed oil is about 3:7, and the graphite powder and the rapeseed oil are mixed and stirred and then coated on the copper pipe wall of the crystallizer by a rolling brush.
S5: and when the dummy ingot is sealed, putting into use a dummy ingot box, and fixing the added cold steel material in the dummy ingot box.
Specifically, when the dummy ingot is sealed, the dummy ingot box is put into use, the added cold steel material is fixed in the dummy ingot box, the cold steel material is ensured not to be in contact with the copper pipe wall of the crystallizer, and the resistance of pulling the primary head blank when starting is reduced.
S6: the emergence time is controlled to be delayed at least until 12s is started.
Specifically, the emergence time is controlled, the emergence time is delayed from original 8s to at least 12s, and can be delayed to 12s, 13s, 14s or 15s, preferably, the emergence time is delayed from original 8s to 12s, wherein the emergence time is counted from the moment when the stopper rod is pressed to discharge molten steel, the thickness of the primary shell is ensured, the tensile strength is improved, and the shell is prevented from being pulled to crack.
S7: and after the casting flow starts, adding protective slag into the primary blank shell in the crystallizer in advance to melt slag in advance.
Specifically, after the casting flow starts, a proper amount of protective slag is added into the primary blank shell in the crystallizer in advance to melt slag in advance, liquid slag is formed earlier, and lubrication of the blank shell is promoted. Specifically, taking the diameter of an immersion nozzle as an example of 26mm, the stopper 2/3 needs to be pressed when the first molten steel flow is poured, the molten steel flow is adjusted to be a trickle after about 3s, the time for adding the covering slag in advance is 2s after stabilizing the trickle, the adding amount only needs 50 g-100 g, the residual covering slag is added when the molten steel in the crystallizer rises to a position about 400mm away from the upper opening of a copper pipe of the crystallizer, and the performance requirements of the covering slag include low viscosity, good lubrication, low melting point and high melting speed.
It is easy to understand that the execution sequence of S1-S7 is not strict, and the effect of starting the bloom at high speed can be achieved by integrating the operation methods of S1-S7 or partially adopting the operation methods of S1-S7 in the conventional process of starting the bloom.
The casting starting control method of the small square billet casting machine provided by the embodiment of the invention has the beneficial effects that:
1. the amplitude of the crystallizer is increased to +/-5 mm at least from the original +/-4 mm, the covering slag can be melted as early as possible during casting, liquid slag with good heat conduction and lubrication is formed, the negative slip rate is increased, the liquid slag is promoted to form and flow into a gap between a blank shell and a copper wall, the heat conduction and the lubrication performance are improved, and the demoulding of a primary blank shell is promoted;
2. the water quantity of the foot roll of the crystallizer is changed from the water quantity which is matched with the corresponding water quantity according to the pulling speed in the prior art, the cold water quantity of the foot roll is instantly opened to the maximum when the crystallizer starts, and after the preset time is kept, the cold water quantity is gradually restored to a normal value (namely, the cold water quantity is matched with the pulling speed at the time), so that the primary blank head is cooled with enough strength, and the flash of a dummy ingot (the cooling of the blank head is insufficient, and molten steel overflows);
3. when casting and feeding the dummy ingot, stopping the dummy ingot head at a position away from the lower opening of the crystallizer, and prolonging the waiting time of the primary blank head on the copper pipe as far as possible from the position which is increased to be more than 300mm, and simultaneously reducing the blank drawing resistance;
4. only coating rapeseed oil before the copper pipe wall of the crystallizer, in order to ensure the lubricity of the rapeseed oil, graphite powder is added into the rapeseed oil, so that the lubricating effect is further improved, and the lubricity between the blank shell and the copper pipe wall is improved;
5. controlling the seedling emergence time, and starting from original 8s to 12s at least, ensuring the thickness of the primary shell, improving the tensile strength, and preventing the shell from being pulled and cracked;
6. when the dummy ingot is sealed, the dummy ingot box is put into use, and the added cold steel material is fixed in the dummy ingot box, so that the cold steel material is not contacted with the wall of the crystallizer, and the resistance of pulling the primary head blank in the beginning is reduced;
7. after the casting flow starts, adding a proper amount of covering slag into the primary blank shell in the crystallizer in advance to melt slag in advance, forming liquid slag earlier and promoting the lubrication of the blank shell;
8. through the measures, the high-pulling-speed starting process is basically realized, the starting pulling speed reaches 1.8m/min, even 2.0m/min, better economic benefit is created, and no negative influence is caused on safety and environmental protection.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The method for controlling the casting start of the billet casting machine is characterized by comprising the following steps of:
increasing the amplitude of the crystallizer to at least +/-5 mm;
when the small square billet casting machine starts casting, the amount of cold water of the foot roll II is opened to the maximum, the preset time is kept, and then the water amount is gradually recovered to the normal water amount;
when casting and feeding the dummy ingot, stopping the dummy ingot head at a position which is more than 300mm away from the lower opening of the crystallizer;
smearing a mixed solution of graphite powder and rapeseed oil on the copper pipe wall of the crystallizer;
the emergence time is controlled to be delayed at least until 12s is started.
2. The method for controlling the start of the casting of the billet caster as claimed in claim 1, wherein the weight ratio of the graphite powder in the mixed liquid of the graphite powder and the rapeseed oil is controlled within the range of 30-40%.
3. The starting control method for the billet caster as claimed in claim 2, wherein the weight ratio of the graphite powder to the rapeseed oil in the mixed liquid of the graphite powder and the rapeseed oil is 3: 7.
4. The starting control method for the billet caster according to claim 1, wherein the preset time period is: 12s to 18 s.
5. The bloom control method of claim 1, further comprising:
and when the dummy ingot is sealed, putting into use a dummy ingot box, and fixing the added cold steel material in the dummy ingot box.
6. The start-up control method of a billet caster as claimed in claim 1, wherein the step of stopping the head of the dummy ingot at a position more than 300mm from the lower mouth of the mold when the dummy ingot is supplied by the start-up includes:
when casting and feeding the dummy ingot, stopping the dummy ingot head at a position 400mm away from the lower opening of the crystallizer.
7. The bloom control method of claim 1, further comprising:
and after the casting flow starts, adding protective slag into the primary blank shell in the crystallizer in advance to melt slag in advance.
8. The method for controlling the start of casting of the billet caster as claimed in claim 7, wherein the step of adding mold flux to the primary shell inside the mold in advance after the start of the casting flow to melt the slag in advance comprises:
pouring a first molten steel flow, pressing a plug 2/3, keeping the first time for a first time, adjusting the molten steel flow to a trickle, and adding a first part of the covering slag after stabilizing the trickle for a second time;
and adding the residual covering slag when the molten steel in the crystallizer rises to a position away from the upper opening of the copper pipe of the crystallizer by a preset distance.
9. The method for controlling the start of the casting of a billet caster as claimed in claim 8, wherein the step of adding the first portion of mold flux after the first period of time of starting casting presses the stopper 2/3, adjusting the flow of steel to a trickle after the first period of time, and stabilizing the trickle for a second period of time comprises:
and (3) pouring a first molten steel flow, pressing the stopper opening rod 2/3, keeping for 2-4 s, adjusting the molten steel flow to a trickle, stabilizing the trickle for 1-3 s, and adding 50-100 g of covering slag.
10. The method for controlling the start of casting of a billet caster as claimed in claim 8, wherein the step of adding the remaining mold flux when the molten steel in the mold rises to a position away from the upper opening of the copper tube of the mold by a predetermined distance comprises:
when the molten steel in the crystallizer rises to a position 400mm away from the upper opening of a copper pipe of the crystallizer, the residual covering slag is added.
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| CN202210538340.4A CN114799108A (en) | 2022-05-17 | 2022-05-17 | Casting starting control method for small square billet casting machine |
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Citations (6)
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