CN108672668A - The method and its control device of casting blank solidification institutional framework in a kind of control casting process - Google Patents
The method and its control device of casting blank solidification institutional framework in a kind of control casting process Download PDFInfo
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- CN108672668A CN108672668A CN201810268641.3A CN201810268641A CN108672668A CN 108672668 A CN108672668 A CN 108672668A CN 201810268641 A CN201810268641 A CN 201810268641A CN 108672668 A CN108672668 A CN 108672668A
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- 238000005266 casting Methods 0.000 title claims abstract description 98
- 238000007711 solidification Methods 0.000 title claims abstract description 44
- 230000008023 solidification Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 126
- 238000010583 slow cooling Methods 0.000 claims abstract description 113
- 238000001816 cooling Methods 0.000 claims abstract description 105
- 238000009749 continuous casting Methods 0.000 claims abstract description 40
- 206010019027 Haemothorax Diseases 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 36
- 239000002344 surface layer Substances 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000013461 design Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002352 surface water Substances 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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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
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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
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Abstract
The invention discloses the methods and its control device of casting blank solidification institutional framework in a kind of control casting process, belong to metallurgical continuous casting technical field.The method of the present invention is provided with superpower cold-zone and heating slow cooling area in the section that crystallizer collector nozzle to Coagulated hemothorax terminates, continuous casting billet first carries out superpower cooling in superpower cold-zone, heating slow cooling then is carried out in heating slow cooling area, wherein the intensity of cooling of heating slow cooling is less than air-cooled intensity of cooling；The device of the invention is provided with superpower cold-zone and heating slow cooling area in the lower part of continuous cast mold along the length direction of continuous casting billet, and superpower cold-zone is used to provide water-spraying control to casting billet surface, and heating slow cooling area is used to provide heat to casting billet surface.Continuous casting billet of the present invention first carries out superpower cooling in superpower cold-zone, then carries out heating slow cooling in heating slow cooling area, reduces column crystal spacing and gap, improve the consistency of the nearly surface layer column crystal of strand, improve slab quality.
Description
Technical field
The present invention relates to metallurgical continuous casting technical fields, more specifically to casting blank solidification in a kind of control casting process
The method and its control device of institutional framework.
Background technology
In modern steel continuous casting technology, the structure and defect of continuous casting billet structure seriously affect always slab quality, by
Under the conditions of refrigerating mode in traditional continuous casting technology, strand structure is suitable to the performance of casting material and part during molten steel solidification
Answering property is often insufficient, and the deficiency of control methods and degree makes the controllability of consolidated structure also bad, cannot meet and increasingly improve
To materials'use performance, especially specific individual requirement.For example, the column trichite to undue growth in some cases
It reaches so that center segregation is serious；Cooling is improper in the case of other and makes crystal grain and crystal boundary coarse；For another example, the later stage is solidified
The column crystal of preferred growth is lost control of and meets to form " bridging " at strand center, and molten steel is by " solidification crystal brige " point in liquid core
It opens, crystal brige lower part molten steel cannot get upper metal supplement in solidification shrinkage and form loose or shrinkage cavity, and adjoint center segregation,
The relevant issues such as uneven components.To solve the above-mentioned problems, low temperature casting technique, electromagnetism are formd in this aspect for a long time
Stirring technique and solidification end slighter compress or rolling casting technology etc., but its these technology coagulates blank surface, secondary surface layer and center portion
Gu institutional framework is still undesirable.
Through retrieval, a kind of method (publication number of producing high-carbon chromium bearing steel by double retarded cooling process：CN101412183A；It is open
Day：2009.04.22), which passes through in strand burial pit, using strand high temperature Slow cooling, the hydrogen for discharging strand contains
Stocking, is then put into slow cooling cover, further to discharge the hydrogen and stress in stocking by amount and stress again.It is given birth to by slow cooling twice
The production method of production high-carbon-chromium bearing steel can ensure that stocking low multiple quality exists without Light spots crack defect.But it is worth noting
, the prior art is often that the strand completed for solidification is handled to the slow cooling processing of strand, it is difficult to be effectively reduced
Column crystal spacing and gap are especially difficult to effectively improve the consistency of the nearly surface layer column crystal of strand.
Invention content
1. technical problems to be solved by the inivention
The purpose of the present invention overcomes the solidification structure of prior art blank surface, secondary surface layer and center portion still undesirable
The problem of, a kind of method and its control device controlling casting blank solidification institutional framework in casting process is provided,
The method of casting blank solidification institutional framework in a kind of control casting process wherein provided, in crystallizer collector nozzle to solidifying
Gu the section that terminal terminates is provided with superpower cold-zone and heating slow cooling area, continuous casting billet first carries out superpower cooling in superpower cold-zone, and
Heating slow cooling is carried out in heating slow cooling area afterwards, column crystal spacing and gap can be reduced, improve the cause of the nearly surface layer column crystal of strand
Density, while reducing the generation of underbead crack；
A kind of device controlling casting blank solidification institutional framework based on heating slow cooling wherein provided, the lower part of continuous cast mold
The length direction of continuous casting billet is provided with superpower cold-zone and heating slow cooling area, superpower cold-zone is used to provide water spray to casting billet surface
Cooling, heating slow cooling area is used to provide heat to casting billet surface, can reduce column crystal spacing and gap, and it is close to improve strand
The consistency of surface layer column crystal, and reduce the generation of underbead crack.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
The method of casting blank solidification institutional framework in a kind of control casting process of the present invention, in crystallizer collector nozzle to solidification
The section that terminal terminates is provided with superpower cold-zone and heating slow cooling area, and continuous casting billet first carries out superpower cooling in superpower cold-zone, then
Heating slow cooling is carried out in heating slow cooling area, wherein the intensity of cooling of heating slow cooling is less than air-cooled intensity of cooling.
Preferably, weak cooling zone is additionally provided between superpower cold-zone and heating slow cooling area, weak cooling zone cooling is strong
Intensity of cooling of the degree less than superpower cooling.
Preferably, superpower cold-zone jet density is Q L/m2Weak cooling zone jet density is q L/m2, Q >=2q.
Preferably, the superpower cooling starting point of superpower cold-zone is located at crystallizer collector nozzle, and the length of superpower cold-zone is more than 12%
L, wherein L are total cooling length, and total cooling length is from crystallizer collector nozzle to Coagulated hemothorax.
Preferably, the distance between the heating slow cooling starting point in heating slow cooling area and crystallizer crystallizer collector nozzle are more than 40%
L, wherein L are total cooling length.
Preferably, superpower cold-zone jet density >=465L/m of round billet continuous casting base2Or rectangular billet caster base is superpower cold
Area's jet density >=490L/m2Or superpower cold-zone jet density >=255L/m of slab continuous casting billet2。
Preferably, it is heated to casting billet surface in heating slow cooling area, the thermal energy magnitude of heating is more than 5kW/m2。
Preferably, the heating slow cooling terminal in the heating slow cooling area is located at before Coagulated hemothorax.
A kind of device controlling casting blank solidification institutional framework based on heating slow cooling of the present invention, the lower part edge of continuous cast mold
The length direction for continuous casting billet is provided with superpower cold-zone and heating slow cooling area, and superpower cold-zone is used to provide water spray to casting billet surface cold
But, heating slow cooling area is used to provide heat to casting billet surface.
Preferably, the continuous casting billet surface in heating slow cooling area is provided with electromagnetic heating coil or heating mantles, wherein heating mantles
For steam heating mantles either imflammable gas heating mantles or reflective insulation self-heating cover.
Preferably, the front in heating slow cooling area is provided with weak cooling zone.
3. advantageous effect
Using technical solution provided by the invention, compared with existing known technology, there is following remarkable result：
(1) in a kind of control casting process of the invention casting blank solidification institutional framework method, crystallizer collector nozzle extremely
The section that Coagulated hemothorax terminates is provided with superpower cold-zone and heating slow cooling area, and continuous casting billet first carries out superpower cooling in superpower cold-zone,
Can effectively reduce an interdendritic away from and gap, improve strand in column crystal consistency, reduce column crystal it is loose, then
Heating slow cooling is carried out in heating slow cooling area, the temperature gradient in strand is reduced, reduces casting billet surface and internal temperature difference, inhibit
The growth of column crystal also avoids the occurrence of the generation of crack of billet；To reduce column crystal spacing and gap, improve strand
The solidification structure on secondary surface layer and center portion, improves the consistency of the nearly surface layer column crystal of strand, while reducing the production of underbead crack
It is raw；
(2) in a kind of control casting process of the invention casting blank solidification institutional framework method, superpower cold-zone it is superpower cold
But starting point is located at crystallizer collector nozzle, and the length of superpower cold-zone is more than total cooling length of degree 12%, if cooling length is too short
The column crystal of enough densifications and shell thickness as thick as possible can not be then formed, is unfavorable for solidifying the desirable weak cold of later stage implementation
But it controls；
(3) in a kind of control casting process of the invention casting blank solidification institutional framework method, superpower cold-zone and heating are slow
Weak cooling zone is additionally provided between cold-zone, weak cooling zone intensity of cooling is less than the intensity of cooling of superpower cooling, to ensure weak cold
But area has enough ranges, ensures the good transition between superpower cold-zone and heating slow cooling area in casting process, avoids continuous casting
Base transits directly to heating slow cooling area by superpower cold-zone, and then avoids causing surface temperature rise excessive, to reduce solidification cross-sectional area
The underbead crack easily occurred；
(4) in a kind of control casting process of the invention casting blank solidification institutional framework method, the heating in heating slow cooling area
The distance between slow cooling starting point and crystallizer collector nozzle are more than 40% total cooling length, and ring cold end is heated in heating slow cooling area
Point is located at before Coagulated hemothorax, that is, heats the model before the position to Coagulated hemothorax after slow cooling area is located at total cooling length 40%
It encloses, to ensure there is sufficient weak cooling zone between superpower cold-zone and heating slow cooling area, avoids the unexpected temperature liter of casting billet surface
Height can reduce solidification cross-sectional area and underbead crack easily occurs；
(5) a kind of device controlling casting blank solidification institutional framework based on heating slow cooling of the invention, under continuous cast mold
Portion is provided with superpower cold-zone and heating slow cooling area along the length direction of continuous casting billet, and superpower cold-zone is used to provide spray to casting billet surface
Water cooling, heating slow cooling area are used to provide heat to casting billet surface, reduce column crystal spacing and gap, it is close to improve strand
The consistency of surface layer column crystal, while the generation of underbead crack is reduced, it is obtained and different final products performance requirement phases with reaching
The purpose for the casting blank solidification institutional framework answered.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of device controlling casting blank solidification institutional framework based on heating slow cooling of the present invention；
Fig. 2 is that the heating slow cooling area of the present invention is electromagnetic heating coil；
Fig. 3 is the pattern schematic diagram of the strand microstructure of embodiment 4；
Fig. 4 is the pattern schematic diagram of the strand microstructure of comparative example 1.
Label declaration in attached drawing：
100, continuous casting billet；110, molten steel is not solidified；120, solidified shell；
210, superpower cold-zone；220, weak cooling zone；230, heating slow cooling area；
300, continuous cast mold；
410, columnar zone；420, isometric crystalline region；430, loose hole.
Specific implementation mode
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Structure, ratio, size depicted in this specification attached drawing etc., only to coordinate the revealed content of specification,
So that those skilled in the art understands and reads, the enforceable qualifications of the present invention are not limited to, therefore do not have technology
On essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size can be generated not influencing the present invention
The effect of and the purpose that can reach under, should all still fall in the range of disclosed technology contents obtain and can cover.Together
When, cited such as "upper", "lower", "left", "right", " centre " term in this specification are merely convenient to the clear of narration,
Rather than to limit enforceable range, relativeness is altered or modified, in the case where changing technology contents without essence, when also regarding
For the enforceable scope of the present invention.
As shown in Figure 1-Figure 3, a kind of device controlling casting blank solidification institutional framework based on heating slow cooling of the invention, continuous casting
The lower part of crystallizer 300 is provided with superpower cold-zone 210 and heating slow cooling area 230, continuous casting billet along the length direction of continuous casting billet 100
100 outside is solidified shell 120, and not solidify molten steel 110, superpower cold-zone 210 is used for solidification 120 inside of solidified shell
The casting billet surface of green shell 120 provides water-spraying control, i.e., nozzle is provided in superpower cold-zone 210, and nozzle is used for casting billet surface
Water-spraying control is carried out, heating slow cooling area 230 to casting billet surface for providing heat, and then it is slow to carry out heating to casting billet surface
It is cold.As shown in Fig. 2, 100 surface of continuous casting billet in heating slow cooling area 230 is provided with electromagnetic heating coil 231.
Or as shown in figure 3,100 surface of continuous casting billet in heating slow cooling area 230 is provided with heating mantles 231, wherein heating mantles
231 be steam heating mantles either imflammable gas heating mantles or reflective insulation self-heating cover.
As shown in figure 3, the front in heating slow cooling area 230 is provided with weak cooling zone 220, i.e., weak cooling zone 220 is set to super
Between strong cooling section 210 and heating slow cooling area 230.Nozzle is provided in weak cooling zone 220, nozzle is used to carry out to casting billet surface
Water-spraying control.It is worth noting that water-spraying control can also be steam combination cooling.
The method of casting blank solidification institutional framework in a kind of control casting process of the present invention, by molten steel casting process
To strand along casting direction certain area section along apply respectively successively superpower cooling, it is weak cool and heat slow cooling measure, to change
Kind strand time surface layer and center portion solidification structure, while ensureing that entire casting process energy total volume is certain.Specifically
It is bright to be：The section that 300 collector nozzle of continuous cast mold terminates to Coagulated hemothorax is provided with superpower cold-zone 210 and heating slow cooling area
230, continuous casting billet 100 first carries out superpower cooling in superpower cold-zone 210, then carries out heating slow cooling in heating slow cooling area 230,
The intensity of cooling of middle heating slow cooling is less than air-cooled intensity of cooling；The intensity of cooling of superpower cooling is more than air-cooled intensity of cooling.
That is the superpower cooling starting point of superpower cold-zone 210 is located at 300 collector nozzle of continuous cast mold, the length of superpower cold-zone 210
It is total cooling length more than degree 12%L, wherein L, wherein total cooling length is the distance from crystallizer collector nozzle to Coagulated hemothorax,
I.e. superpower cold-zone 210 extends to total cooling length more than 12% along casting direction always by 300 collector nozzle of continuous cast mold.This
It is when being less than 12% total cooling length due to 210 length of superpower cold-zone so that the section of superpower cold-zone 210 is too short so that even
Strand 100 can not form the column crystal of enough densifications and shell thickness as thick as possible, be unfavorable for solidifying desired by later stage implementation
Weak cold but control.The average intensity of cooling of superpower cold-zone 210 is much larger than existing continuous casting technology intensity of cooling, this is because early period
Cooling specific water is small, then so that intensity of cooling is too low, then so that the heat of strand release early period is few, can not quickly form ideal
The green shell of thickness and consistency；Therefore, it is necessary to reinforce cooling early period of strand so that strand total amount of heat is released the early period more as possible
It puts, so that casting billet surface can not quickly form the green shell of ideal thickness and consistency.To make strand total amount of heat exist as possible
Early period discharges more, and makes the different types of superpower intensity of cooling of strand, and intensity of cooling can be indicated with jet density,
Q L/m are used in combination2It is different, specific classified description：
(1) the 210 jet density Q of superpower cold-zone of round billet continuous casting base 1001≥465L/m2；
(2) the 210 jet density Q of superpower cold-zone of rectangular billet caster base 1002≥490L/m2；
(3) the 210 jet density Q of superpower cold-zone of slab continuous casting billet 1003≥255L/m2；And require the thickness of sheet billet continuous casting
Not less than 200mm；
Continuous casting billet 100 goes out the beginning of continuous cast mold 300, applies superpower cooling to it, can be effectively reduced a dendrite
The consistency of column crystal in strand is improved in spacing and gap, and it is loose to reduce column crystal.
It is additionally provided with weak cooling zone 220, weak cooling zone between the superpower cold-zone 210 and heating slow cooling area 230 of the present embodiment
220 intensities of cooling are less than the intensity of cooling of superpower cooling.By it is superpower it is cold after, slab cooling intensity is transitioned into weak cooling zone
220, heating slow cooling area 230 is transitioned into again behind weak cooling zone 220, wherein weak cooling zone 220 is the cooling using continuous casting routine
Intensity.It is worth noting that the intensity of cooling of weak cooling zone 220 is q1L/m2, and superpower intensity of cooling Q L/m2, then Q >=2q1。
And it is for the intensity of cooling of the weak cooling zone of different types of strand 220 different, and it is worth noting that weak cooling zone 220
Intensity of cooling and the conventional chilling intensity in casting process are essentially identical, and intensity of cooling can be indicated with jet density, specifically
Classified description：
(1) region intensity of cooling (the jet density) >=155L/m is required for round billet continuous casting2；
(2) region intensity of cooling (the jet density) >=245L/m is required for rectangular billet caster2；
(2) region intensity of cooling (the jet density) >=85L/m is required for sheet billet continuous casting2.Strand first passes through superpower cold
Area 210 is cooled down, and after carrying out transition using weak cooling zone 220, carries out heating slow cooling into heating slow cooling area 230, can have
Reduce the difference of temperature transition, reduce the temperature gradient in strand, reduce casting billet surface and internal temperature difference, inhibits column crystal
Growth.
The distance between the heating slow cooling starting point in the heating slow cooling area 230 of the present embodiment and 300 collector nozzle of continuous cast mold
The heating slow cooling terminal of total cooling length more than 40%, heating slow cooling area 230 is located at before Coagulated hemothorax.Heat slow cooling
Area 230 is since 300 collector nozzle of continuous cast mold extends greater than 40% total cooling length along throwing direction, to being no more than
Cooling length terminal terminates.By applying heating slow cooling measure to strand, the temperature gradient in strand is reduced, casting billet surface is reduced
With internal temperature difference, inhibits the growth of column crystal, also avoid the occurrence of the generation of crack of billet.Applicant R＆D team,
By researching and developing discovery for a long time, if heating slow cooling area 230 starts in total cooling length less than 40%, routine is easily led to
Cooling zone is too short, can not play good transitional function, and it is excessive to cause casting billet surface temperature to rise, and solidification cross-sectional area is caused easily to occur
Underbead crack, what applicant was creative thus proposes heating slow cooling starting point at total cooling length more than 40%, heating
Slow cooling terminal is located at before Coagulated hemothorax.Further it should be noted that the heating slow cooling terminal in heating slow cooling area 230 and final production
The performance of product is adapted, and if final products are more demanding to strand core, then heats slow cooling area 230, while heating slow cooling area 230
Total length also to match with superpower 210 length of cold-zone early period, ensure that entire casting process energy total volume is certain, it is such as super
The 210 length of strong cooling section the long, heats that 230 length of slow cooling area is longer, that is, heats length and the superpower cold-zone 210 in slow cooling area 230
Length be proportionate, and ensure that casting process energy total volume is certain.The mode of slow cooling is heated to be provided to casting billet surface
The thermal energy magnitude of heating measures, heating is more than 5kW/m2Kilowatt/square metre.
Embodiment 1
The present embodiment carries out on certain steel mill 5 stream round billet continuous casting machine, and strand diameter of section is 380mm, in casting process
Strong cold, weak cold and heating slow cooling measure, 210 length of superpower cold-zone, superpower cold-zone are applied respectively successively along casting direction to strand
210 cooling jet densities, heating slow cooling area 230 heat slow cooling starting point, heating slow cooling area 230 heats and provides heat such as 1 institute of table
Show；Superpower cold-zone 210 is from the lower mouth of continuous cast mold 300 to 22%L, and heating slow cooling area 230 is the positions 55%L to solidifying end
Point.When taking one piece of strand low power sample after casting, analyze the loose situation of column crystal of strand, while measuring strand and solidify completely
Surface temperature, embodiment design parameter and the results are shown in Table 1.
Embodiment 2
The substance of the present embodiment with embodiment 1, the difference is that：Superpower cold-zone 210 cools down jet density, heating
Slow cooling start position and 230 heating offer heat parameter of heating slow cooling area are different, and design parameter is as shown in table 1；Casting knot
One piece of strand low power sample is taken after beam, analyzes the loose situation of column crystal of strand, while measuring surface temperature when strand solidifies completely
Degree, embodiment design parameter and the results are shown in Table 1.
Embodiment 3
The present embodiment carries out on certain steel mill 5 stream round billet continuous casting machine, and strand diameter of section is 700mm, in casting process
Strong cold, weak cold and heating slow cooling measure, 210 length of superpower cold-zone, superpower cold-zone are applied respectively successively along casting direction to strand
210 cooling jet densities, heating slow cooling area 230 heat slow cooling starting point, heating slow cooling area 230 heats and provides heat such as 1 institute of table
Show；Superpower cold-zone 210 is from the lower mouth of continuous cast mold 300 to 17%L, and heating slow cooling area 230 is the positions 55%L to solidifying end
Point.When taking one piece of strand low power sample after casting, analyze the loose situation of column crystal of strand, while measuring strand and solidify completely
Surface temperature, embodiment design parameter and the results are shown in Table 1.
Embodiment 4
The substance of the present embodiment with embodiment 3, the difference is that：Superpower cold-zone 210 cools down jet density, adds
Hot slow cooling start position and 230 heating offer heat parameter of heating slow cooling area are different, and design parameter is as shown in table 1；Casting
After take one piece of strand low power sample, analyze the loose situation of column crystal of strand, while measuring surface when strand solidifies completely
Temperature, embodiment design parameter and the results are shown in Table 1.The picture of 4 strand macrostructure of embodiment is as shown in Figure 4.
Comparative example 1
The substance of the present embodiment with embodiment 4, the difference is that：The jet density of the intensity of cooling of casting billet surface
For 200 L/m2.One piece of strand low power sample is taken after casting, is carried out low power analysis, is analyzed the loose situation of column crystal of strand,
Measure surface temperature when strand solidifies completely simultaneously, 1 design parameter of comparative example and the results are shown in Table 1,1 strand of comparative example is low
The picture of tissue is as shown in Figure 4 again.
Table 1
Remarks：210 length of superpower cold-zone, 230 length unit of heating slow cooling area are L in table, and L indicates total cooling length.
Column crystal tissue looseness is smaller in casting blank solidification tissue in embodiment 1-4 it can be seen from result of implementation, average column
The brilliant loose size of shape is less than 26.0um, and casting blank surface temperature increases, and can imitate the generation for reducing underbead crack, improves casting
Base quality, to meet the needs of different product is to solidified structure.
Further analysis, Fig. 3 are the pattern schematic diagram of the strand microstructure of embodiment 4；Fig. 4 is the casting of comparative example 1
The pattern schematic diagram of base microstructure；Wherein, Fig. 3 and Fig. 4 includes columnar zone 410, isometric crystalline region 420 and loose hole 430,
410 tract tissue of strand columnar zone is of a relatively loose in Fig. 4, and columnar zone 410 has loose hole 430, and the strand column of Fig. 3
410 tract tissue of crystalline region is fine and close, dendrite is careful close, and the loose hole 430 of columnar zone 410 substantially eliminates.Moreover, average column crystal
Loose size is reduced to 26.0um or less by 37.2um.Column crystal spacing and gap are reduced, strand time surface layer and center portion are improved
Solidification structure, improves the consistency of the nearly surface layer column crystal of strand, while reducing the generation of underbead crack.Further comparison
It can be found that comparing comparative example 1, embodiment 4 not only reduces column crystal spacing and gap, improves strand time surface layer and center portion is solidifying
Gu institutional framework, and when expanding isometric crystalline region 420 ratio, so as to improve the quality of strand.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can not take off
It is carry out various modifications in the case of from the scope of the present invention being defined by the following claims and modification.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
It falls into the scope of the present invention described here.In addition, background technology is intended to Development Status and meaning in order to illustrate this technology,
It is not intended to limit the application field of the present invention or the application and the present invention.
Claims (11)
1. a kind of method of casting blank solidification institutional framework in control casting process, which is characterized in that in crystallizer collector nozzle to solidifying
Gu the section that terminal terminates is provided with superpower cold-zone (210) and heating slow cooling area (230), continuous casting billet (100) is first in superpower cold-zone
(210) superpower cooling is carried out, then carries out heating slow cooling in heating slow cooling area (230), wherein the intensity of cooling of heating slow cooling is small
In air-cooled intensity of cooling.
2. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 1, which is characterized in that
It is additionally provided with weak cooling zone (220) between superpower cold-zone (210) and heating slow cooling area (230), the weak cooling zone (220) is cold
But intensity is less than the intensity of cooling of superpower cooling.
3. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 2, which is characterized in that
Superpower cold-zone (210) jet density is Q L/m2, weak cooling zone (220) jet density is q L/m2, Q >=2q.
4. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 1, which is characterized in that
The superpower cooling starting point of superpower cold-zone (210) is located at crystallizer collector nozzle, and the length of superpower cold-zone (210) is more than 12%L, wherein
L is total cooling length.
5. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 1, which is characterized in that
The distance between heating slow cooling starting point and the crystallizer crystallizer collector nozzle for heating slow cooling area (230) are more than 40%L, and wherein L is
Total cooling length.
6. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 1, which is characterized in that
Superpower cold-zone (210) jet density >=465L/m of round billet continuous casting base (100)2Or rectangular billet caster base (100) is superpower cold
Area (210) jet density >=490L/m2Or superpower cold-zone (210) jet density >=255L/m of slab continuous casting billet (100)2。
7. the method for casting blank solidification institutional framework in a kind of control casting process according to claim 1, which is characterized in that
It is heated to casting billet surface in heating slow cooling area (230), the thermal energy magnitude of heating is more than 5kW/m2。
8. according to the method for casting blank solidification institutional framework in a kind of control casting process of claim 1-7 any one of them,
It is characterized in that, the heating slow cooling terminal in the heating slow cooling area (230) is located at before Coagulated hemothorax.
9. a kind of device controlling casting blank solidification institutional framework based on heating slow cooling, it is characterised in that：Continuous cast mold (300)
Lower part is provided with superpower cold-zone (210) and heating slow cooling area (230), superpower cold-zone along the length direction of continuous casting billet (100)
(210) it is used to provide water-spraying control to casting billet surface, heating slow cooling area (230) is used to provide heat to casting billet surface.
10. a kind of device being controlled casting blank solidification institutional framework based on heating slow cooling according to claim 9, feature are existed
In：Continuous casting billet (100) surface of heating slow cooling area (230) is provided with electromagnetic heating coil (231) or heating mantles (231),
Middle heating mantles (231) are steam heating mantles either imflammable gas heating mantles or reflective insulation self-heating cover.
11. a kind of device controlling casting blank solidification institutional framework based on heating slow cooling according to claim 9 or 10, special
Sign is：The front of heating slow cooling area (230) is provided with weak cooling zone (220).
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810268641.3A CN108672668A (en) | 2018-03-29 | 2018-03-29 | The method and its control device of casting blank solidification institutional framework in a kind of control casting process |
| JP2020550144A JP7111828B2 (en) | 2018-03-29 | 2019-03-15 | METHOD AND CONTROL DEVICE FOR CONTROLLING SOLIDIFICATION STRUCTURE OF SMART IN CONTINUOUS CASTING PROCESS |
| EP19777614.9A EP3750649A4 (en) | 2018-03-29 | 2019-03-15 | Method for controlling structure of solidified cast ingot in continuous casting process and control device thereof |
| PCT/CN2019/078326 WO2019184731A1 (en) | 2018-03-29 | 2019-03-15 | Method for controlling structure of solidified cast ingot in continuous casting process and control device thereof |
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| CN201810268641.3A CN108672668A (en) | 2018-03-29 | 2018-03-29 | The method and its control device of casting blank solidification institutional framework in a kind of control casting process |
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| EP (1) | EP3750649A4 (en) |
| JP (1) | JP7111828B2 (en) |
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| CN109317631A (en) * | 2018-10-30 | 2019-02-12 | 武汉钢铁有限公司 | Improve the production method of continuous casting square billet structural homogenity |
| WO2019184731A1 (en) * | 2018-03-29 | 2019-10-03 | 马鞍山钢铁股份有限公司 | Method for controlling structure of solidified cast ingot in continuous casting process and control device thereof |
| CN111707799A (en) * | 2020-06-03 | 2020-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on solidification structure region correspondence |
| CN115383068A (en) * | 2022-09-01 | 2022-11-25 | 一重集团大连工程技术有限公司 | On-line heat preservation device and method for blank tail |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3750649A4 (en) | 2021-04-07 |
| WO2019184731A1 (en) | 2019-10-03 |
| JP7111828B2 (en) | 2022-08-02 |
| JP2021516621A (en) | 2021-07-08 |
| EP3750649A1 (en) | 2020-12-16 |
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