CN117737344A - Large-specification continuous casting round billet core feeding method - Google Patents
Large-specification continuous casting round billet core feeding method Download PDFInfo
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- CN117737344A CN117737344A CN202311442672.3A CN202311442672A CN117737344A CN 117737344 A CN117737344 A CN 117737344A CN 202311442672 A CN202311442672 A CN 202311442672A CN 117737344 A CN117737344 A CN 117737344A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 51
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- 230000008023 solidification Effects 0.000 claims abstract description 18
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- 238000002844 melting Methods 0.000 abstract description 7
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- 229910052761 rare earth metal Inorganic materials 0.000 description 3
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Abstract
The invention relates to the technical field of continuous casting technology, in particular to a large-specification continuous casting round billet core feeding method, which comprises the steps of feeding metal wires into high-temperature molten steel, and melting the metal wires before the tail end of continuous casting solidification; determining the feeding quantity of the metal wire according to a solidification heat transfer theory and a calculation formula by utilizing the liquid core size, the metallurgical length and the working condition parameters of the crystallizer of the continuous casting round billet; the diameter of the wire fed is calculated from the specific steel grade. The invention calculates the quality of the fed metal wire according to the section, the casting temperature and the metallurgical length of the continuous casting billet, reduces the superheat degree and the temperature gradient in the melt body in the crystallizer by reasonably controlling the shape and the mode of the fed metal wire, breaks dendrites and increases nucleation points for grain growth, realizes the feeding of the core of the continuous casting round billet, and can effectively improve the defects of segregation, looseness, cracks and the like of the core in the production process of the continuous casting round billet.
Description
Technical Field
The invention relates to the technical field of continuous casting processes, in particular to a large-specification continuous casting round billet core feeding method.
Background
At present, the ways for improving the solidification structure of the metal material mainly comprise low superheat casting, secondary cooling control technology, electromagnetic stirring technology, light pressing technology, crystallizer steel belt feeding or wire feeding technology and the like. However, in practical production and application, the low superheat degree may reduce the fluidity of molten steel and even cause nozzle blockage. The secondary cooling control technology realizes forced cooling of the casting blank by changing the spraying mode of cooling water, but the cooling efficiency and the improvement effect on the casting blank structure are difficult to determine. The electromagnetic stirring technology promotes the convection and heat transfer of molten steel by applying electromagnetic force, and the forced convection can fuse crystal nucleus, eliminate bridging phenomenon and improve the central looseness and shrinkage cavity of casting blank, but the device for applying electromagnetic stirring has high cost and huge investment in the early stage. The soft reduction technique counteracts the volume shrinkage caused by solidification of the casting blank by applying a certain amount of reduction, but the improper control of the reduction can lead to cracking of the shell. The steel band or metal wire is fed into molten steel, and the overheat of molten steel in the crystallizer is reduced and crystal nucleus is produced by means of heat absorption of molten steel or metal wire, so that the solidification process of continuous casting blank from the surface to the inside is changed into the crystallization process of simultaneous solidification from the inside to the outside, and the solidification structure of casting blank is improved by reducing overheat of molten steel and increasing equiaxial crystal nucleus. The process not only can avoid the defects of the methods, but also can effectively reduce the cost. However, the steel belt feeding and wire feeding technology of the crystallizer is started later, the research on process equipment and process parameters is relatively less, and the influence rule on the solidification structure in the continuous casting blank is not clear.
As an economical and convenient way for improving the quality of casting blanks, the crystallizer steel belt feeding and wire feeding technology can optimize the production efficiency and has low cost. In order to prevent molten steel from being polluted by slag entrained by a steel belt, chinese patent application No. CN114669722A proposes a method for discharging slag from a feeding zone by blowing air from an air gun, and Chinese patent application No. CN105149536A proposes a slag discharging device for feeding the steel belt by a gas-shielded continuous casting crystallizer. Chinese patent applications CN104325103A, CN105149536a and CN206065356U separate the feeding zone from the non-feeding zone by a slag discharge or protection device, and protective gas is introduced into the feeding zone to avoid slag inclusion. The Chinese patent application CN102974791A gives forced resonance to the steel belt by means of an electromagnetic vibrator, and ensures stable feeding of the steel belt. Chinese patent applications CN107900298A and CN104325100a respectively propose a novel continuous casting crystallizer central belt feeding device and method. Chinese patent application CN115896396a discloses a method for feeding rare earth wires to a crystallizer, wherein the molten rare earth component flows along with molten steel, so that the uniformity of rare earth element distribution in the casting blank is improved.
The crystallizer steel belt feeding and wire feeding technology can still have negative effects under different application environments, such as aggravated fluctuation of the liquid level of the crystallizer, disturbed meniscus, slag entrainment and molten steel pollution.
Disclosure of Invention
Aiming at the technical problems that the fluctuation of the liquid level of a crystallizer is aggravated, a meniscus is disturbed, molten steel is polluted by slag entrained and the like possibly caused by the steel strip feeding and wire feeding technology of the crystallizer, the invention provides a large-specification continuous casting round billet core feeding method, the quality of fed metal wires is calculated according to the section, the casting temperature and the metallurgical length of the continuous casting billet, the superheat degree and the temperature gradient in a melt in the crystallizer are reduced by reasonably controlling the shape and the mode of the fed metal wires, dendrites are broken, the nucleation points for grain growth are increased, the continuous casting round billet core feeding is realized, and the defects of segregation, looseness, cracks and the like of the core in the production process of the continuous casting round billet can be effectively improved.
The technical scheme of the invention is as follows:
a large-scale continuous casting round billet core feeding method comprises the steps of feeding metal wires into high-temperature molten steel, and melting the metal wires before the continuous casting solidification end;
the feeding amount of the metal wire is calculated according to the following formula:
，
，
，
wherein y is 1/2 of the thickness of the round billet and is mm; k is the coagulation coefficient, mm/min 1/2 The method comprises the steps of carrying out a first treatment on the surface of the t is the setting time, min;
q is heat flux density, mW/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Z is the distance from the meniscus, m;V c for the blank pulling speed, m/s;
Ffeeding the metal wire with a feeding amount of kg;C p to fix the specific heat capacity of molten steel, kJ.kg -1 ·℃ -1 ；T tun The temperature of molten steel at the outlet of the tundish is DEG C;T liq is the liquidus temperature of molten steel, DEG C;Ais the cross-sectional area, m 2 ；T 0 Is the initial temperature of the metal wire, and the temperature is lower than the temperature;q lat is the latent heat of fusion of the metal wire, kJ/kg; alpha is the correction coefficient of the superheat quantity of the molten steel;ρ steel for feeding wire density, kg/m 3 ；
The diameter of the wire is calculated according to the following formula:
，
wherein lambda is the feed ratio;ρ steel for feeding wire density, kg/m 3 ；ρ cast For continuous casting billet density, kg/m 3 ；V f For the wire feed speed, m/s;dis the diameter of the metal wire, mm;Dthe diameter of the continuous casting round billet is mm;V c for the drawing speed, m/s.
Further, the correction coefficient of the superheat quantity of the molten steelα0.981.
Further, the metal wire is a cored wire or a solid wire. The fed cored wire or the solid wire can be fully melted in high-temperature molten steel.
Furthermore, the metal wire is in a disc structure, so that fluctuation of the liquid level of the crystallizer caused by wire feeding can be reduced.
Further, the wire enters from above the center of the crystallizer in an inclined manner. The inclined wire feeding mode can enable the metal wires to enter along the solidification liquid core, and the purpose of core feeding is achieved by ensuring melting before the continuous casting solidification tail end.
Furthermore, the metal wires are inclined at 30-45 degrees to the central axial direction of the crystallizer and inclined at 3-10 degrees to the transverse direction of the crystallizer, so that the subsequent homogenization time is shortened.
Further, working condition parameters of the crystallizer in the continuous casting process of the round billet are collected before the feeding quantity of the metal wire is determined.
Further, the working condition parameters comprise the temperature of the molten steel at the outlet of the tundish, the working pulling speed, the specification of round billets, the chemical composition of the molten steel, the solidus temperature and the liquidus temperature.
Further, the diameter phi of the large-specification continuous casting round billet is more than or equal to 800mm.
The invention has the beneficial effects that:
the invention provides a method for feeding metal wires into a continuous casting round billet according to parameters such as the specification, the metallurgical length and the like of the continuous casting round billet, wherein the feeding quality is obtained by calculation according to the solidification shrinkage; the diameter of the metal wire is calculated and determined according to specific steel types, and melting is ensured before the solidification end, so that the method is a feasible method for realizing continuous casting round billet core feeding.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic illustration of a process for feeding a wire fed round billet core in an embodiment of the invention.
FIG. 2 is a schematic view showing the inclination relation between the wire and the central axial direction of the mold in the embodiment of the present invention.
Fig. 3 is a schematic view showing the inclination of the wire with respect to the lateral direction of the mold in the embodiment of the present invention.
FIG. 4 is a photograph showing a low magnification test of the core of a round steel blank of phi 800mm 45 in example 1 of the present invention after feeding.
FIG. 5 is a photograph showing a low magnification test of the core of a steel round billet of phi 800mm S355NL in example 2 of the present invention after feeding.
In the figure, a 1-wire feeding reel, a 2-driving device, a 3-guiding device, a 4-water gap, a 5-crystallizer, 6-molten steel and 7-solidified blank shells.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
A large-specification continuous casting round billet core feeding method comprises the following steps:
step 1: collecting working condition parameters of a crystallizer in the continuous casting process of round billets of different specifications and steel grades, wherein the working condition parameters comprise the temperature of molten steel at an outlet of a tundish, the working pulling speed, the specification of the round billets, the chemical composition of the molten steel, the solidus temperature and the liquidus temperature;
step 2: the feeding quantity of the metal wire is determined according to a solidification heat transfer theory and a calculation formula by utilizing the liquid core size, the metallurgical length and the working condition parameters of the crystallizer of the continuous casting round billet, wherein the specific formula is as follows:
（1），
（2），
（3），
in the formula (1), the components are as follows,y1/2 of the thickness of the round billet;kfor the coagulation factor, mm/min 1/2 ；tSetting time, min;
in the formula (2), Q is heat flux density, mW/m 3 ；ZM is the distance from the meniscus;V c for the blank pulling speed, m/s;
obtaining the setting time in (1)tObtaining the blank pulling speed by using the method (2)VcSubstituting the formula (3) to calculate, in the formula (3),Ffeeding the metal wire with a feeding amount of kg;C p to fix the specific heat capacity of molten steel, kJ.kg -1 ·℃ -1 ；T tun The temperature of molten steel at the outlet of the tundish is DEG C;T liq is the liquidus temperature of molten steel, DEG C;Ais the cross-sectional area, m 2 ；T 0 Is the initial temperature of the metal wire, and the temperature is lower than the temperature;q lat is the latent heat of fusion of the metal wire, kJ/kg;αthe correction coefficient for the superheat quantity of the molten steel is 0.981;ρ steel for feeding wire density, kg/m 3 ；
Step 3: the wire feeding robot is used for feeding wires, the wire feeding robot can adjust feeding positions, feeding angles, feeding speeds and feeding amounts according to parameters such as drawing speeds, casting temperatures, solidification shrinkage amounts and the like of different steel grades, the wire feeding robot comprises a wire feeding reel, a driving device and a guiding device, the driving device is used for driving the wire feeding reel to feed wires, the guiding device controls metal wires to enter from the upper part of the center of the crystallizer in an inclined mode, and particularly the metal wires are inclined at 30-45 degrees with the axial direction of the center of the crystallizer and inclined at 3-10 degrees with the transverse direction of the crystallizer; the metal wire is in a cored wire or solid wire type disc structure, can be fully melted in high-temperature molten steel, and can reduce the fluctuation of the liquid level of the crystallizer caused by wire feeding due to the disc structure; the diameter of the wire fed is calculated from the specific steel grade, ensuring melting before solidifying the end, the specific formula is as follows:
，
in the method, in the process of the invention,λis the feeding ratio;ρ steel for feeding wire density, kg/m 3 ；ρ cast For continuous casting billet density, kg/m 3 ；V f For the wire feed speed, m/s;dis the diameter of the metal wire, mm;Dthe diameter of the continuous casting round billet is mm;
example 1
The method is adopted to feed the core of the large 45 steel round billet, the steel grade w (%) is 0.45 C,0.15 Si,0.62 Mn,0.02 S,0.015 P,0.12 Cr,0.10 Mo,0.10 Ni, and the balance is Fe. The size of the casting blank is phi 800mm, and the blank drawing speed is highVcThe superheat degree was 20℃at 0.16 m/min.
Determining the feeding quantity of the metal wire according to a solidification heat transfer theory and a calculation formula by utilizing the size of a liquid core of the continuous casting round billet, the metallurgical length and the acquired working condition parameters of the crystallizer, and the formula is as follows:
，
，
，
calculating to obtain the feeding amount of the metal wireF80kg.
The wire feeding robot is used for feeding wires, and the metal wires are of a solid wire type disc structure, so that melting before solidifying the tail ends is ensured. The diameter of the wire fed is calculated from the specific steel grade and the formula is as follows:
，
wherein the feed ratio isλAt 0.8% of the density of the fed wireρ steel 7800kg/m 3 Wire feed speedV f Density of continuous casting billet of 5.7m/minρ cast 7850kg/m 3 Speed of drawingV c The diameter of the continuous casting round billet is 0.16m/minD800mm;
calculating the diameter of the metal wiredIs 12mm.
By adjusting the angle of the wire feeding robot, the metal wire enters from the upper part of the center of the crystallizer in an inclined mode, and the metal wire forms 30 degrees with the axial direction of the center and forms 7 degrees with the transverse direction of the crystallizer.
Metallographic detection is carried out on the phi 800mm 45 steel round billet obtained after feeding, and the result is shown in figure 4, the center porosity of the large round billet is 1.0 level, the center shrinkage cavity is 0.5 level, and no center crack exists.
Example 2
The method is adopted to feed the core of the large 45 steel round billet, the steel grade w (%) is 0.20 C,0.35 Si,1.20 Mn,0.015 S,0.015 P,0.42 Cu,0.30 Cr,0.10 Mo,0.50 Ni, and the balance is Fe. The size of the casting blank is phi 800mm, and the blank drawing speed is highVcThe superheat degree was 20℃at 0.16 m/min.
Determining the feeding quantity of the metal wire according to a solidification heat transfer theory and a calculation formula by utilizing the size of a liquid core of the continuous casting round billet, the metallurgical length and the acquired working condition parameters of the crystallizer, and the formula is as follows:
，
，
，
calculating to obtain the feeding amount of the metal wireF100kg.
The wire feeding robot is used for feeding wires, and the metal wires are of a solid wire type disc structure, so that melting before solidifying the tail ends is ensured. The diameter of the wire fed is calculated from the specific steel grade and the formula is as follows:
，
wherein the feed ratio isλAt 1.0% of the density of the fed wireρ steel 7800kg/m 3 Wire feed speedV f 4.5m/min, continuous casting densityρ cast 7850kg/m 3 Speed of drawingV c The diameter of the continuous casting round billet is 0.16m/minD800mm;
calculating the diameter of the metal wired15mm.
By adjusting the angle of the wire feeding robot, the metal wire enters from the upper part of the center of the crystallizer in an inclined mode, and the metal wire forms 30 degrees with the axial direction of the center and forms 7 degrees with the transverse direction of the crystallizer.
Metallographic detection is carried out on the phi 800mm S355NL steel round billet obtained after feeding, and the result is shown in figure 5, the center porosity of the large round billet is 1.0 level, the center shrinkage cavity is 0.5 level, and no center crack exists.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (9)
1. A large-specification continuous casting round billet core feeding method is characterized in that metal wires are fed into high-temperature molten steel and melted before continuous casting solidification ends;
the feeding amount of the metal wire is calculated according to the following formula:
，
，
，
in the method, in the process of the invention,y1/2 of the thickness of the round billet;kfor the coagulation factor, mm/min 1/2 ；tSetting time, min;
q is heat flux density, mW/m 3 ；ZM is the distance from the meniscus;V c for the blank pulling speed, m/s;
Ffeeding the metal wire with a feeding amount of kg;C p to fix the specific heat capacity of molten steel, kJ.kg -1 ·℃ -1 ；T tun The temperature of molten steel at the outlet of the tundish is DEG C;T liq is the liquidus temperature of molten steel, DEG C;Ais the cross-sectional area, m 2 ；T 0 Is the initial temperature of the metal wire, and the temperature is lower than the temperature;q lat is the latent heat of fusion of the metal wire, kJ/kg;αthe correction coefficient is the superheat quantity of the molten steel;ρ steel for feeding wire density, kg/m 3 ；
The diameter of the wire is calculated according to the following formula:
，
in the method, in the process of the invention,λis the feeding ratio;ρ steel for feeding wire density, kg/m 3 ；ρ cast For continuous casting billet density, kg/m 3 ；V f For the wire feed speed, m/s;dis the diameter of the metal wire, mm;Dthe diameter of the continuous casting round billet is mm;V c for the drawing speed, m/s.
2. The large-scale continuous casting round billet core feeding method according to claim 1, wherein the molten steel superheat correction coefficient isα0.981.
3. The large-scale continuous casting round billet core feeding method according to claim 1 wherein the wire is a cored wire or a solid wire.
4. The large scale continuous casting round billet core feeding method according to claim 1 wherein the wire is in a disc-round structure.
5. The large scale continuous casting round billet core feeding method of claim 1 wherein the wire enters from above the center of the crystallizer in an inclined manner.
6. The feeding method for large-scale continuous casting round billet cores according to claim 5, wherein the metal wires are inclined at 30-45 degrees to the central axial direction of the crystallizer and inclined at 3-10 degrees to the transverse direction of the crystallizer.
7. The large-scale continuous casting round billet core feeding method according to claim 1, wherein working condition parameters of a crystallizer in the round billet continuous casting process are collected before the feeding amount of the metal wire is determined.
8. The large scale continuous casting round billet core feeding method of claim 7 wherein the operating parameters include tundish outlet molten steel temperature, operating pull rate, round billet gauge, molten steel chemical composition, solidus temperature and liquidus temperature.
9. The method for feeding a core of a large-scale continuous casting round billet according to claim 1, wherein the diameter phi of the large-scale continuous casting round billet is not less than 800mm.
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| CN202311442672.3A CN117737344A (en) | 2023-11-01 | 2023-11-01 | Large-specification continuous casting round billet core feeding method |
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