CN109047695B - A kind of immersed nozzle for continuous casting mould Argon control method - Google Patents
A kind of immersed nozzle for continuous casting mould Argon control method Download PDFInfo
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- CN109047695B CN109047695B CN201810865585.1A CN201810865585A CN109047695B CN 109047695 B CN109047695 B CN 109047695B CN 201810865585 A CN201810865585 A CN 201810865585A CN 109047695 B CN109047695 B CN 109047695B
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of immersed nozzle for continuous casting mould Argon control methods comprising: S1: according to the width K for the Wide and Thick Slab casting blank section to be produced, thickness H, slab pulling rate Vc, calculating be passed through theoretical volume flow of the argon gas at 25 DEG C, calculation formula are as follows:Wherein η=0.05~0.15, expression cross section of argon stream in the submersed nozzle account for the ratio of the submersed nozzle cross section；S2: according to the theoretical volume flow being calculated, control and adjusting argon gas are passed through speed, and the molten steel in crystallizer forms three whirlpool type flow fields at this time.Preferably, further include step S3, by controlling the volume flow rate with fine adjustment argon gas, concentrate on the argon gas bubbles group projected from the outlet of the submersed nozzle in one region fan-shaped relative to the projection of crystallizer broadside wall surface.Flow velocity is conveyed according to the method for the present invention control argon gas, the cast steel plate flaw detection qualification rate of the manufacturing reaches 98% or more.
Description
Technical field
The present invention relates to continuous casting process, in particular to a kind of immersed nozzle for continuous casting mould Argon control method.
Background technique
Wide and Thick Slab is very strict to internal quality requirement, especially for important structural member such as boiler, pressure vessel, pipe
Line, skyscraper etc..Detection defects are one of prevailing quality defects of Wide and Thick Slab, and domestic and international metallargist carries out in this regard
The main reason for a lot of research work, discovery leads to detection defects is the aggregation of minute bubbles and non-metallic inclusion in slab.
In al-killed steel grade continuous casting process, to prevent sprue gate dross, Argon technology has been widely used in the industry at present
(stopper Argon, filling pipe end Argon etc.).Argon Bubble can prevent submersed nozzle from blocking, and Argon Bubble, which enters in crystallizer, to be stirred
Molten steel is mixed, the ingredient and temperature of uniform molten steel promote non-metallic inclusion to float, improve the quality of slab.But Argon is improper
Also bring along negative impact: Argon amount is excessive to easily cause that upper surface molten steel is exposed, slag；Argon amount is too small and will cause the mouth of a river
Blocking, bias current.Therefore rationally control argon blowing amount is needed.
During continuous cast mold Argon, due to the effect of buoyancy, most of bubbles (bubble in a fan-shaped region
Group) floating upward quickly, and the minute bubbles of some de- groups can enter crystallizer depths under the action of molten steel jet stream.These de- groups enter
For the bubble of crystallizer depths in the molten steel bath retention period, surface will adsorb a large amount of non-metallic inclusions, and be solidified base together
Shell captures." sliver (microcrack) " or " blister (bubble) " etc. is formed in subsequent heat treatment and rolling process to lack
It falls into.Therefore, the generation for reducing de- group's bubble as far as possible, to improving, Wide and Thick Slab internal soundness is most important.As user is to steel
The continuous improvement that service performance requires, to produce high purity steel, it is necessary to reasonable Argon control method is proposed, to obtain height
The cast steel material of quality.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, inventor is to further investigate and understand molten steel/argon in continuous cast mold
The Two-Phase Flow Field and bubble distribution feature of gas propose a kind of reasonable continuous casting crystallining for different production status and appointed condition
Device submersed nozzle Argon control method, facilitates continuous casting worker's execute-in-place, improves the flaw detection qualification rate of Wide and Thick Slab.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of immersed nozzle for continuous casting mould Argon control method, comprising:
S1: according to the width K for the Wide and Thick Slab casting blank section to be produced, thickness H, slab pulling rate Vc, calculating be passed through argon gas
Theoretical volume flow at 25 DEG C, calculation formula are as follows:
Wherein η=0.05~0.15 indicates that the cross section of argon stream accounts for the immersion in the submersed nozzle
The ratio of mouth of a river cross section；
S2: according to the theoretical volume flow being calculated, control and adjusting argon gas are passed through speed, at this time in crystallizer
Molten steel forms three whirlpool type flow fields.
Preferably scheme, wherein η=0.1, even if the cross section of argon stream accounts for the immersion in the submersed nozzle
The 10% of formula mouth of a river cross section.
Test proves, when the cross section of argon stream in the submersed nozzle accounts for the 5 of the submersed nozzle cross section
When~15%, i.e., argon gas volume flow accounts for 5~15% of the total fluid volume flow by the submersed nozzle, at this time argon gas
After being passed through the crystallizer, under molten steel jet stream and argon gas bubbles the natural buoyancy effect of injection, the flow field of molten steel that is formed at this time
Belong to three whirlpool type flow fields, is conducive to the removal of non-metallic inclusion.
Preferably, further include step S3, by controlling the volume flow rate with fine adjustment argon gas, make from the submersed nozzle
The argon gas bubbles group that projects of outlet concentrate in a fan-shaped region of projection relative to crystallizer broadside wall surface.
Preferably, the step S3 is made by controlling the volume flow rate with fine adjustment argon gas from the submersed nozzle
The argon gas bubbles group that outlet is projected concentrates in fan-shaped region as shown in Figure 2.
The present invention is under the basis for guaranteeing the three whirlpool type flow fields of molten steel composition in crystallizer, by further controlling and adjusting
The volume flow rate of argon gas makes argon gas bubbles group remain fan-shaped in the projection of crystallizer broadside wall surface, is reduced as far as de- group's gas
The generation of bubble, anti-anti-avulsion group bubble enter crystallizer depths and capture in the latter same green shell that is solidified of absorption non-metallic inclusion,
Cast steel plate is caused the major qualities defect such as blind crack and bubble occur.
Judge whether argon gas is passed through whether speed is appropriate, can be from the discharge opening position of the upper surface argon gas bubbles of crystallizer
And size determines whether argon gas air-blowing quantity is appropriate, therefore can be observed and be monitored by the surface to crystallizer, and according to sight
It examines or monitoring result, accordingly to control and adjust the volume flow rate of argon gas.
Specifically, further include step S3, by controlling the volume flow rate with fine adjustment argon gas, make from the submersed nozzle
The argon gas bubbles that project of outlet spued from crystallizer upper surface with star spot shape, the diameter of the single point that spues is less than 10mm.Asterism
Shape spues and the diameter of the single point that spues is less than 10mm, can guarantee at this time be not in large area it is exposed and caused by secondary oxygen
Change.
Further, if definition spues from the argon gas bubbles that the outlet of the submersed nozzle is projected from crystallizer upper surface
Position be that bubble discharge region by controlling and adjusting the volume flow rate of argon gas makes bubble discharge region between described
The submersed nozzle is not contacted between submersed nozzle and mould at narrow wall surface and and crystallizer is narrow side wall surface；As a result,
The solidification hook that can avoid being crystallized wall face captures, and prevents occurring the defects of blind crack or bubble inside cast steel plate.
Still further, if using from the submersed nozzle to the distance the mould at narrow wall surface as reference, institute
Bubble discharge region is stated between the position of 1/6~4/6 distance.It is defined beyond aforementioned in the argon gas bubbles discharge region being such as passed through
Position range except, if such as closer to mould at narrow wall surface, should suitably reduce the flow velocity that is passed through of argon gas, it is on the contrary then answer
Appropriate increase argon gas is passed through flow velocity.
The present invention can be spat by the way that crystallizer upper surface is observed and monitored according to argon gas bubbles discharge region and bubble
Form out if bubble discharge region and form meet features described above, that is, thinks rationally, without adjusting to determine blowing effect
Argon gas is passed through speed.Otherwise the instant pulling rate first according to steel plate slab is needed, the volume flow control of argon gas in submersed nozzle is made
System in 5~15% ranges of fluid volume flow, calculates the flow velocity theoretical value for being passed through argon gas in the submersed nozzle；So
Afterwards, the volume flow rate of argon gas is adjusted according to the theoretical value；Argon gas flow velocity is finally further finely tuned, is reached aforementioned required
Argon Bubble discharge regional location, discharge form and the point features such as size that spue.
In addition, continuous casting is a transient, it requires in entire crystallizer casting process according to Wide and Heavy Plates
The instant pulling rate of slab constantly adjusts.
(3) beneficial effect
The beneficial effects of the present invention are:
According to Argon control method proposed by the present invention, distribution of movement of the argon gas bubbles in crystallizer can be effectively controlled,
The generation for reducing de- group's bubble makes the flow field of molten steel in crystallizer maintain three whirlpool type structures, is conducive to going for non-metallic inclusion
It removes；Argon Bubble is discharged in crystallizer upper surface with star spot shape, and diameter is less than 10mm, and it is exposed and cause to can avoid occurring large area
Secondary oxidation.
It verifies, the steel plate produced through the Argon control method, is detected using ultrasonic examination internal through actual production
Without excessive defect, steel plate inspection qualification rate reaches 98% or more.
Detailed description of the invention
Fig. 1 is the three whirlpool type flow field schematic diagrames by Mold when submersed nozzle blowing argon gas.
Fig. 2 is to make argon gas bubbles group fan-shaped concentration in a crystallizer in control method of the present invention by adjusting Argon amount
The schematic diagram of distribution.
Fig. 3 is to make argon gas bubbles in crystallizer upper surface covering slag slag by adjusting Argon amount in control method of the present invention
The schematic diagram of face argon gas bubbles discharge region position.
[description of symbols]
1 submersed nozzle；2 water-gap outlets；3 crystallizer center vertical sections；4 mould at narrow wall surfaces；Table on 5 crystallizers
Face；6 close to submersed nozzle 1 upper reflux；7 close to mould at narrow wall surface upper reflux；8 lower reflux；9 argon gas bubbles；10
The sector of argon gas bubbles group composition；11 de- group bubbles；12 solidified shells；15 crystallizer broadside wall surfaces；Table on 13 crystallizer slag blankets
Face；The bubble discharge point of 14 star spot shapes；16 bubble discharge regions.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
As shown in Figure 1, considering the symmetry of crystallizer, Fig. 1 is a half structure of crystallizer and submersed nozzle 1.At this
Water-gap outlets 2 are symmetrically equipped at left and right sides of 1 lower end of submersed nozzle.3 expression crystallizer center vertical sections (it is assumed that), 4
Indicate mould at narrow wall surface, 5 indicate crystallizer upper surface, and 6 indicate the upper reflux close to submersed nozzle 1, and 7 indicate close to narrow
The upper reflux in side wall face 4,8 indicate the lower reflux of molten steel in crystallizer.The molten steel jet stream projected from the outlet of submersed nozzle 12
And argon gas bubbles can be divided into two strands of jet streams under the action of argon gas bubbles natural buoyancy, wherein 1 strand is transported to crystallizer upper surface 5
It is dynamic, flow back 6 in formation, another strand is continued to move to narrow side wall surface 4, flows back 7 and next time after impacting narrow side wall surface 4, in formation
Stream 8, and then constitute three whirlpool type flow fields.For the three whirlpools type flow field, inventor is studied for many years, and discovery can be by the instant of slab
Pulling rate and argon gas are passed through flow velocity and codetermine and realize, i.e., when the cross section of argon stream in the submersed nozzle 1 is the leaching
When entering the 5~15% of 1 cross section of the formula mouth of a river, the three whirlpools type flow field can be formed, the ventilation volume flow of argon gas is to pass through this at this time
The 5~15% of the total fluid volume flow of submersed nozzle.Compared to double vortex fields under not blowing argon gas, in the three whirlpools type flow field
20% or so will be improved by acting on lower removal rate of the non-metallic inclusion in crystallizer upper surface.
It is between 5~15% to reach cross section accounting of the control argon stream in the cross section in submersed nozzle 1
Purpose, argon gas can be gone out according to following theoretical formula method in 25 DEG C of lower volume flow velocitys:
Assuming that the Wide and Thick Slab casting blank section of production are as follows: K (width) × H (thickness), the pulling rate of slab are Vc.Flow through the mouth of a river
Molten steel volume flow is QSteel, meet following relationship:
QSteel=K × H × Vc (1)
That industry spot can monitor is the argon flow Q under normal temperature and pressure (25 DEG C, 1atm)Ar,25℃.When under normal temperature and pressure
After argon gas enters submersed nozzle by filling pipe end, high temperature (assuming that 1540 DEG C) causes argon gas to expand, and flow becomes QAr,1540℃。
Its corresponding relationship are as follows:
Volume flow accounting η of the argon gas in mouth of a river cross section can be calculated by following formula:
Therefore, the argon flow under adjustable normal temperature and pressure can be calculated by following formula:
When controlling and adjust the volume flow rate of argon gas, first according to formula (4), η=0.05~0.15 therein is enabled, in terms of
Calculate the theoretical value Q for obtaining argon flowAr,25℃, then according to theoretical value QAr,25℃It is defeated to the filling pipe end of the submersed nozzle 1
The argon gas volume flow rate entered is adjusted, to guarantee that the molten steel in crystallizer forms three whirlpool type flow fields.
Then further, in the case of guaranteeing to constitute three whirlpool type flow fields, stream is passed through by further micro-adjustment argon gas
Speed makes argon gas bubbles maintain fan-shaped integrated distribution mode in the projection of the broadside wall surface 15 of crystallizer, as shown in Figure 2.
Referring to fig. 2, wherein 9 indicate argon gas bubbles, 10 indicate the sector of argon gas bubbles group composition, and 11 indicate de- group's bubble,
12 indicate solidified shell.When argon gas bubbles group maintains fan-shaped distribution as shown in Figure 2, most of argon gas bubbles are at bubble
In the sector 10 of group's composition, these bubbles disperse will float and remove under the action of natural buoyancy, be in crystallizer upper surface 5
Star spot shape discharge point 14, all discharge points constitute bubble discharge region 16.When the starlike point of the bubble formation of floating spues point,
Be conducive to control the generation of de- group's bubble 11 at this time.When 10 region of sector of bubble population composition is smaller, i.e., most of bubble exists
When submersed nozzle 1 nearby floats, the big void fraction near submersed nozzle 1 will will cause big face around submersed nozzle 1
Long-pending naked leakage, easily causes slag and secondary oxidation.When 10 region of sector of bubble population composition is larger, front end can even be reached
Mould at narrow wall surface 4 forms micro-cracks or bubble at this point, bubble is easy to be solidified the capture of green shell 12 in cast steel plate.Cause
This, it is preferable that by adjust argon gas be passed through flow velocity, make the argon gas bubbles 9 being passed into crystallizer from submersed nozzle 1 reach and
Maintain fan-shaped distribution as shown in Figure 2.
Further, in order to reach argon gas bubbles 9 and maintain fan-shaped distribution as shown in Figure 2, present invention proposition passes through
From crystallizer upper surface 5 and the features such as position, form in monitoring argon gas bubbles discharge region grasp bubble in crystallizer
The distribution situation of group, and argon gas draft speed is further adjusted, to realize that argon gas bubbles 9 reach and maintain fan as shown in Figure 2
The purpose of shape distribution.
Schematic top plan view from being illustrated in figure 3 from crystallizer upper surface 5 downwards.Wherein, 13 crystallizer slag blanket is indicated
Upper surface, 14 indicate the bubble discharge point of star spot shape, and 16 indicate bubble discharge region, and 15 indicate crystallizer broadside wall surface.Pass through
Fine adjustment argon gas is passed through flow velocity, makes the argon gas being passed into crystallizer from the outlet of the submersed nozzle 12, with star described in Fig. 3
When dotted discharge, it is not in that large area is exposed that single discharge spot diameter is less than 10mm at this time.The bubble of these star spot shapes spues
Point 14 constitutes bubble discharge region 16.Further, by the flow velocity of fine adjustment argon gas, make bubble discharge region 16 between immersion
Between the formula mouth of a river 1 and narrow side wall surface 4；It is further preferable that if the bubble discharge region 16 is in submersed nozzle 1 and narrow side wall surface 4
Between total distance 1/6~4/6 position, and make the edge in the bubble discharge region 16 at a distance from narrow side wall surface 4 be greater than the gas
The edge in discharge region 16 is steeped at a distance from submersed nozzle 1, thus avoids being captured by the solidification hook of narrow side wall surface 4.
In addition, Argon flow velocity also needs constantly to adjust according to the transient casting situation of practical continuous casting.
To further illustrate technical effect of the invention, now according to above-described control method, for manufacturing generous casting
Steel plate, specific embodiment 1-2 as follows, and internal flaw situation is detected using ultrasonic examination.
Embodiment 1
Wide and Thick Slab casting blank section are as follows: K=2300mm, H=220mm, pulling rate Vc=0.8m/min, it is assumed that initial argon gas exists
Volume flow accounting η=10% of mouth of a river cross section, then the flow velocity initial value that argon gas is passed through (at the filling pipe end of submersed nozzle)
It should control:
Then, it is finely adjusted according to crystallizer slag blanket upper surface discharge opening situation, the fine tuning includes:
By controlling the volume flow rate with fine adjustment argon gas, make to export the argon gas bubbles projected from the submersed nozzle 1
Group concentrates in a region fan-shaped relative to the projection of crystallizer broadside wall surface 15, fan section preferably as shown in Figure 2
In domain.
The fine tuning specifically includes: by controlling the volume flow rate with fine adjustment argon gas, making the outlet from submersed nozzle 1
The diameter that 2 argon gas bubbles projected are spued with star spot shape from crystallizer upper surface, and individually spued a little is less than 10mm, and makes bubble
Leaching of the discharge region 16 between submersed nozzle 1 and mould at narrow wall surface 4, close to 1 side 1/6~4/6 of submersed nozzle
Enter the position of 1 crystallizer of the formula mouth of a river Yu 4 spacing of narrow side wall surface.
The cast steel plate produced according to the present embodiment, ultrasonic examination detection is internal without excessive defect, and steel plate inspection is qualified
Rate reaches 98.6%.
Embodiment 2
Wide and Thick Slab casting blank section are as follows: K=2300mm, H=300mm, pulling rate Vc=0.6m/min, it is assumed that initial argon gas exists
Volume flow accounting η=10% of mouth of a river cross section, then the flow velocity initial value that argon gas is passed through (at the filling pipe end of submersed nozzle)
It should control:
Then, it is finely adjusted according to crystallizer slag blanket upper surface discharge opening situation, makes argon gas bubbles group's structure in crystallizer
At the form of Figure of description Fig. 2.
The cast steel plate produced according to the present embodiment, ultrasonic examination detection is internal without excessive defect, and steel plate inspection is qualified
Rate reaches 98.3%.
Describe control principle of the invention in conjunction with specific embodiments above, these descriptions are intended merely to explain of the invention
Principle shall not be construed in any way as a limitation of the scope of protection of the invention.Based on explaining herein, those skilled in the art
It can associate with other specific embodiments of the invention without creative labor, these modes fall within this hair
Within bright protection scope.
Claims (6)
1. a kind of immersed nozzle for continuous casting mould Argon control method characterized by comprising
S1: according to the width K for the Wide and Thick Slab casting blank section to be produced, thickness H, slab pulling rate Vc, calculating be passed through argon gas 25
Theoretical volume flow at DEG C, calculation formula are as follows:
Wherein η=0.05~0.15 indicates that the cross section of argon stream accounts for the submersed nozzle in the submersed nozzle
The ratio of cross section；
S2: according to the theoretical volume flow being calculated, control and adjusting argon gas are passed through speed, at this time the molten steel in crystallizer
Form three whirlpool type flow fields.
2. a kind of immersed nozzle for continuous casting mould Argon control method according to claim 1, which is characterized in that η=
0.1, i.e., so that the cross section of argon stream accounts for the 10% of the submersed nozzle cross section in the submersed nozzle.
3. a kind of immersed nozzle for continuous casting mould Argon control method according to claim 1 or 2, which is characterized in that
Further include step S3, by controlling the volume flow rate with fine adjustment argon gas, makes the argon projected from the outlet of the submersed nozzle
Gas bubble population concentrates in a region fan-shaped relative to the projection of crystallizer broadside wall surface.
4. a kind of immersed nozzle for continuous casting mould Argon control method according to claim 3, which is characterized in that make from
The argon gas bubbles that the outlet of the submersed nozzle is projected are spued from crystallizer upper surface with star spot shape, the diameter of the single point that spues
Less than 10mm.
5. a kind of immersed nozzle for continuous casting mould Argon control method according to claim 4, which is characterized in that definition
The position that the argon gas bubbles projected from the outlet of the submersed nozzle spue from crystallizer upper surface is bubble discharge region, is led to
It crosses control and adjusts the volume flow rate of argon gas, make bubble discharge region between the submersed nozzle and mould at narrow wall
The narrow side wall surface of the submersed nozzle and crystallizer is not contacted between face and.
6. a kind of immersed nozzle for continuous casting mould Argon control method according to claim 5, which is characterized in that with from
The submersed nozzle is reference to the distance between the mould at narrow wall surface, and bubble discharge region is between 1/6~4/6
The position of the distance.
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| CN112404380B (en) * | 2020-10-29 | 2021-12-10 | 宝钢特钢韶关有限公司 | Method for reducing inclusions in bearing steel and continuous casting argon blowing control method |
| CN113500173B (en) * | 2021-06-11 | 2022-10-11 | 上海大学 | Control method for molten steel flow field form of medium-section slab crystallizer |
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| JP2000126850A (en) * | 1998-10-26 | 2000-05-09 | Sumitomo Metal Ind Ltd | Continuous casting method |
| JP2003334638A (en) * | 2002-05-20 | 2003-11-25 | Nippon Steel Corp | Immersion nozzle for continuous casting and continuous casting method using the same |
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