CN210648413U - Continuous casting billet homogenizing device - Google Patents
Continuous casting billet homogenizing device Download PDFInfo
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- CN210648413U CN210648413U CN201921082868.5U CN201921082868U CN210648413U CN 210648413 U CN210648413 U CN 210648413U CN 201921082868 U CN201921082868 U CN 201921082868U CN 210648413 U CN210648413 U CN 210648413U
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Abstract
The utility model provides a continuous casting billet homogenizing device, wherein pulse harmonic magnetic field coils are respectively arranged at the lower position of a continuous casting machine crystallizer, and continuous harmonic magnetic field coils are arranged at the tail end of the continuous casting machine; in the continuous casting production process, when the continuous casting billet passes through the pulse harmonic magnetic field coil earlier, receive pulse harmonic magnetic field effect and form a large amount of primary crystal nucleuses, when rethread continuous harmonic magnetic field coil, receive continuous harmonic magnetic field intensive stirring effect, a large amount of crystal nucleuses receive the flow field effect homodisperse inside the fuse-element to obtain the continuous casting billet of solidification structure homogenization. The utility model is used for semi-continuous casting and continuous casting production in the metallurgical industry, is suitable for the homogenization of solidification structure of various metal materials.
Description
Technical Field
The utility model belongs to the technical field of metallurgical and metal material preparation, especially, relate to a continuous casting billet homogenizing device.
Background
Research on the solidification process of metals by physical fields began in the 30's of the 20 th century at the earliest, and has not progressed much thereafter. This is because the application of this technique is severely restricted by the requirements of high-density current, ultra-strong magnetic field and high-power ultrasonic wave. In addition, in that period, solidification structure refining techniques such as inoculation, modification and microalloying in the field of materials are developed rapidly, and solidification grain refining techniques with simple processes are more likely to be accepted. After the 21 st century, the traditional fine grain technology is questioned by the proposal of material environment coordination, and meanwhile, the rapid development of scientific technologies in the fields of physics, materials, electronics and the like makes the generation of physical means such as high-power current, magnetic fields, ultrasonic waves and the like possible. Then, the physical field refinement technology becomes a hot spot problem in the material field again from the 90 s in the 20 s world, wherein the technology becomes a new bright spot of the physical field solidification refinement technology due to the high output peak value of the pulse physical field and the small equipment load. The technology of solidification and refinement by adding a physical field starts late in China, but researches on sudden and violent advance and different military prominences in recent years lead to the same approach in the world especially in the aspects of pulse physical field solidification and fine grain technology and researches on high-temperature alloys such as steel materials and the like.
The refining of the metal solidification structure mainly comprises the traditional methods of a process method, a chemical method and an external field method. The technological process includes controlling cooling speed, deformation treatment and deep supercooling and can obtain refined metal solidification structure simply and directly. The chemical rule is a method for controlling growth and promoting nucleation to refine the structure of the metal casting by adding a growth inhibitor, a nucleating agent and the like to increase the number of heterogeneous cores.
In continuous casting production, the main physical means for controlling the quality of continuous casting billets include electromagnetic stirring, pulse magnetic oscillation, heavy pressure and light pressure. The heavy pressure and the light pressure are both used for applying certain deformation pressure at the solidification tail end of the continuous casting billet, so that a small amount of residual melt of a liquid core permeates into the core to effectively weld the solidification shrinkage cavity and eliminate the central shrinkage cavity. The electromagnetic stirring can reduce columnar crystal areas and enlarge isometric crystal areas, and has the effect of refining grains, but the defect is that the effect of refining the grains is not obvious. Like electromagnetic stirring, the pulse magnetic oscillation can also generate electromagnetic force in the metal melt, and has stirring and vibrating effects on the melt; the method is characterized in that the pulse magnetic oscillation can generate larger electromagnetic force oscillation to promote the nucleation and separation of the melt and drift into a free heterogeneous core, so as to further achieve the effect of refining a solidification structure, but the pulse magnetic oscillation has weak contribution to the macroscopic flow of the melt and cannot shrink the center of the continuous casting billet.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: to above problem, the utility model provides a continuous casting billet homogenizing device and method, in the continuous casting production process, package fuse-element superheat degree is in 15 ~ 55 ℃ of the control within range, in the metal melt pouring crystallizer on the conticaster in the middle package, owing to receive the forced cooling effect of crystallizer, solidify the continuous casting billet that forms and have certain billet shell thickness, and do not pull out downwards, the continuous casting billet is earlier when passing through pulse harmonic magnetic field coil, start pulse harmonic magnetic field power, receive pulse harmonic magnetic field effect and form primary crystal nucleus, during the continuous harmonic magnetic field coil of rethread, start continuous harmonic magnetic field power (2), receive the strong stirring effect of continuous harmonic magnetic field, a large amount of crystal nuclei receive flow field effect homodisperse inside the fuse-element, thereby obtain the continuous casting billet of solidification tissue homogenization. The utility model discloses can effectively improve continuous casting billet tissue and composition homogeneity, the equiaxed crystal increase rate is more than 50%, and the carbon segregation index is maintained within 1.07, eliminates central shrinkage cavity.
The technical scheme is as follows: for realizing the purpose of the utility model, the utility model adopts the technical proposal that: the utility model provides a continuous casting billet homogenizing device, the device includes pulse harmonic magnetic field power (1), continuous harmonic magnetic field power (2), conticaster (4), cooling water outlet (7), cooling water inlet (8), crystallizer (9), host computer (10), middle package (11), pulse harmonic magnetic field coil (12), first encapsulation shell (13), continuous harmonic magnetic field coil (14), second encapsulation shell (15), its characterized in that:
the pulse harmonic magnetic field coil (12) is placed in a first packaging shell (13), the continuous harmonic magnetic field coil (14) is placed in a second packaging shell (15), and a cooling water outlet (7) and a cooling water inlet (8) are respectively welded outside the first packaging shell (13) and the second packaging shell (15); the crystallizer (9) is fixed at the top end of the continuous casting machine (4), the tundish (11) is positioned above the crystallizer (9), and the first packaging shell (13) is arranged below the crystallizer (9) and fixed on the continuous casting machine (4); the second packaging shell (15) is fixed at the tail end of the casting machine (4);
the upper computer (10) is respectively connected with the pulse harmonic magnetic field power supply (1) and the continuous harmonic magnetic field power supply (2), the pulse harmonic magnetic field power supply (1) is connected with the pulse harmonic magnetic field coil (12), and the continuous harmonic magnetic field power supply (2) is connected with the continuous harmonic magnetic field coil (14).
Furthermore, the device also comprises a water-cooled cable or copper pipe (5), a copper wire or aluminum wire (6); the pulse harmonic magnetic field power supply (1) is connected with the pulse harmonic magnetic field coil (12) through a water-cooled cable or a copper pipe (5), and the continuous harmonic magnetic field power supply (2) is connected with the continuous harmonic magnetic field coil (14) through a copper wire or an aluminum wire (6).
Further, the first packaging shell (13) is arranged at a position of 0.5-5 m below the crystallizer (9) of the continuous casting machine.
Furthermore, insulating paint is sprayed on the surfaces of the pulse harmonic magnetic field coil (12) and the continuous harmonic magnetic field coil (14).
Furthermore, the upper computer (10) is respectively connected with the pulse harmonic magnetic field power supply (1) and the continuous harmonic magnetic field power supply (2) through the Ethernet.
Furthermore, the pulse harmonic magnetic field coil (12) is a spring-shaped coil, and the shape of the spring coil and the shape of the inner opening of the first packaging shell (13) are any one of circular, square and polygon.
Furthermore, the number of layers of the pulse harmonic wave magnetic field coil is 1-4, and the number of turns is 2-200.
Further, the distance between the first packaging shell (13) and the second packaging shell (15) on the continuous casting machine (4) is 1-6 m.
Furthermore, the pulse harmonic magnetic field coil (12) is a spring-shaped coil wound by a copper pipe or an aluminum pipe, and the continuous harmonic magnetic field coil (14) is a plurality of motor coils wound by copper wires or aluminum wires and is respectively arranged around the second packaging shell (15).
The utility model discloses still provide a continuous casting billet homogenizing device produce the method of homogenization continuous casting billet, this method includes following step:
(1) water is supplied to a cooling water inlet (8) and a cooling water outlet (7), a water-cooled cable or copper pipe (5), a pulse harmonic magnetic field coil (12) and a continuous harmonic magnetic field coil (14) are cooled, and power supply starting parameters are preset for a pulse harmonic magnetic field power supply (1) and a continuous harmonic magnetic field power supply (2) through an upper computer (10);
(2) starting a pulse harmonic magnetic field power supply (1) and a continuous harmonic magnetic field power supply (2) according to the set parameters;
(3) when the continuous casting production is started, controlling the superheat degree of a melt of the tundish (11) within the range of 15-55 ℃ and starting casting;
(4) the metal melt in the tundish (11) is poured into a crystallizer (9) on a continuous casting machine (4), and is cooled by the crystallizer (9) to solidify to form a continuous casting billet (3) with a certain billet shell thickness, and the continuous casting billet is continuously pulled downwards, and when the continuous casting billet (3) passes through a pulse harmonic magnetic field coil (12), a pulse harmonic magnetic field power supply (1) is started to form a primary crystal nucleus under the action of a pulse harmonic magnetic field; and when the crystal passes through the continuous harmonic magnetic field coil (14), the continuous harmonic magnetic field power supply (2) is started, and the crystal nucleus is uniformly dispersed in the melt under the action of the flow field under the stirring action of the continuous harmonic magnetic field, so that the homogenized continuous casting blank is generated.
Further, the pulse harmonic magnetic field power supply (1) and the continuous harmonic magnetic field power supply (2) can also be started before casting.
In the continuous casting production process, when the continuous casting billet passes through the pulse harmonic magnetic field coil earlier, start pulse harmonic magnetic field power (1), receive pulse harmonic magnetic field effect formation primary crystal nucleus, when rethread continuous harmonic magnetic field coil (14), start continuous harmonic magnetic field power (2), receive continuous harmonic magnetic field strong stirring effect, a large amount of crystal nuclei receive flow field effect homodisperse inside the fuse-element to reach the effect that homogenization continuous casting billet solidifies the tissue, eliminate central shrinkage cavity.
The utility model is as shown in figure 1, the pulse harmonic magnetic field coil is wound into a spring shape by a copper pipe or an aluminum pipe, the outside is welded and packaged by a metal shell and fixed on a continuous casting machine 0.5 m-5 m below the crystallizer, and the spring coil is packaged by insulating paint and then placed in a packaging shell; when the cooling device works, the spring coil is soaked in cooling water in the metal shell, and the cooling water is introduced into the copper tube of the spring coil. The pulse harmonic magnetic field power supply and the pulse harmonic magnetic field coil are connected through a water-cooled cable or a copper pipe, the continuous harmonic magnetic field coil is wound by a copper wire or an aluminum wire, the continuous harmonic magnetic field coil is a motor coil fixed on the periphery of the packaging shell, is packaged by insulating paint and then is placed in the packaging shell, and is soaked in cooling water in a metal shell during work. The continuous harmonic magnetic field coil is fixed at the tail end of the continuous casting machine, the continuous harmonic magnetic field power supply is connected with the continuous harmonic magnetic field coil through a copper wire, and the upper computer controls the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply simultaneously through a (10) PLC cable. Moreover, the packaging shell can be made of stainless steel.
In the process of producing the continuous casting billet, all coils are fixed on a continuous casting machine before continuous casting production, and a cooling water system is started to ensure that the coils normally work in the high-temperature radiation and self-induction heating environment of the continuous casting billet. When the continuous casting billet passes through the harmonic magnetic field coil, a harmonic magnetic field power supply connected with the coil is started; and the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply can be started before production starts, and the power supply is turned off after the production is finished through the whole process.
The upper computer (10) controls the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply simultaneously through a Programmable Logic Controller (PLC) to set power supply parameters. The pulse harmonic magnetic field power supply parameters may be set as: the pulse harmonic voltage is 1V-1000V, the no-load magnetic field intensity in the coil is 50 Gauss-25000 Gauss, the trigger frequency f is 1 Hz-500 Hz, and the duty ratio is less than 30%; the parameters of the continuous harmonic magnetic field power supply are as follows: the harmonic voltage is 50V-1000V, the no-load magnetic field intensity in the coil is 50 Gauss-20000 Gauss, and the frequency f is 1 Hz-100 Hz. Due to the diversity of steel types in continuous casting production and the difference of blank shell thickness of the coil position under different steel types and production processes, the harmonic magnetic field power supply frequency can be adjusted to meet the requirement that at least 20% of energy penetrates through the blank shell thickness of the coil position, and the parameters can be set according to actual needs, which are only explained as examples.
The principle of the pulse harmonic magnetic field power supply is that power grid power frequency current is rectified into direct current, then a non-polar capacitor is charged, discharging of a pulse harmonic magnetic field coil is achieved through a silicon controlled switch, the discharging circuit is designed to be an underdamped oscillating circuit, the pulse harmonic magnetic field coil is a spring coil, the number of layers can be 1-4, and the number of turns is 2-200. The principle of the continuous harmonic magnetic field power supply is that power grid power frequency current is rectified into direct current, then the direct current is converted into 1 Hz-100 Hz harmonic current through an inverter circuit, and a continuous harmonic magnetic field is induced through a continuous harmonic magnetic field coil, wherein the magnetic field is in the form of a rotating magnetic field taking a continuous casting blank as a shaft or a traveling wave magnetic field along the blank drawing direction. Because the skin effect is generated when the alternating electromagnetic field is transmitted in the metal conductor, and the thickness of the blank shell of the continuous casting blank is different at different positions of the continuous casting machine, the frequency selection of the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply needs to meet the requirement that at least 20% of energy penetrates through the thickness of the blank shell at the position of the coil.
Through the experiment, the utility model discloses an optimum parameter process range does: controlling the superheat degree of a continuous casting tundish melt at 10-50 ℃, controlling the pulse harmonic voltage at 100-800V, controlling the no-load magnetic field intensity in a coil at 50-15000 Gauss, and controlling the trigger frequency f at 3-100 Hz; the continuous harmonic magnetic field parameters are: the harmonic voltage is 50V-1000V, the no-load magnetic field intensity in the coil is 300 Gauss-15000 Gauss, and the frequency f is 1 Hz-50 Hz.
Has the advantages that: compared with the prior art, the technical scheme of the utility model following beneficial technological effect has:
(1) pulse harmonic magnetic field frequency higher, the duty cycle is less than 30%, the electromagnetic energy concentrates on continuous casting billet thin surface layer more easily in, and the continuous casting billet comes out to the conticaster end from the crystallizer, blank shell thickness becomes the thickening gradually, installs pulse harmonic magnetic field coil at two cold areas of conticaster one section, continuous casting billet shell is thinner, is favorable to producing the electromagnetic force oscillation in the solid-liquid interface department of blank shell annex, promotes the nucleation to break away from the type wall, form free crystal nucleus. However, the free crystal nucleus falls down along the mould wall under the action of gravity, and the inward solidification is accelerated after the continuous casting billet is taken out of the coil, so that the crystal nucleus is easily swallowed again. The continuous harmonic magnetic field coil is arranged behind the pulse harmonic magnetic field coil, and has low frequency and high power, so that strong forced flow can be generated. The strong flow field can be used for homogenizing the internal temperature field of the melt, so that the survival of free crystal nuclei is facilitated, and the free crystal nuclei can be uniformly dispersed in the whole melt to form volume solidification, so that the aims of refining solidification structures and eliminating central shrinkage cavities are fulfilled.
(2) The utility model provides a 220X 260 rectangular billet homogenization level that the method was handled is showing and is being superior to untreated casting blank, and GCr15 bearing steel, 20CrMnTi gear steel and ZTM-S2 high carbon tool steel equiaxed crystal rate all obviously increase, and casting blank center carbon segregation index is not higher than 1.04, wherein:
(a) by the treatment of the technology, the central equiaxed crystal proportion of the GCr15 bearing steel casting blank is 21-32%, and the average increment rate is 40%; the ratio of 20CrMnTi gear steel central equiaxed crystal is 16-26%, and the average increase is 108%; the ratio of the central equiaxial crystals of the ZTM-S2 high-carbon tool steel casting blank reaches 24-35%, and the average increase rate is 95%;
(b) the central carbon segregation index of GCr15 bearing steel is controlled to be between 1.00 and 1.03, the central carbon segregation index of 20CrMnTi gear steel is controlled to be between 0.97 and 1.04, and the central carbon segregation of ZTM-S2 high-carbon tool steel is between 1.0 and 1.01.
(3) The utility model discloses equip the low price, easy operation safety improves continuous casting billet quality effect very obvious, is applicable to semi-continuous casting and continuous casting production, and easy dismounting.
Drawings
FIG. 1 is a schematic diagram of a slab homogenization process apparatus;
FIG. 2 is a schematic diagram of a sampling process for analyzing carbon content by a five-point method for a cross section of a continuous casting billet;
FIG. 3 is a schematic winding diagram of a continuous harmonic magnetic field coil;
reference numbers in fig. 1: 1. the device comprises a pulse harmonic magnetic field power supply, a continuous casting billet, a continuous casting machine, a water-cooled cable or copper pipe, a copper wire or aluminum wire, a cooling water outlet, a cooling water inlet, a crystallizer, a host computer, a tundish, a pulse harmonic magnetic field coil, a first packaging shell, a continuous harmonic magnetic field coil and a second packaging shell, wherein the continuous harmonic magnetic field coil is 14, the crystallizer is 9, the host computer is 10, the tundish is 11, the pulse harmonic magnetic field coil is 12, the first packaging shell is 13, and.
Detailed Description
The invention is further illustrated by the following examples; the examples are given solely for the purpose of illustration and are not intended to limit the invention in any manner.
Example 1
The experimental procedure was as follows: in the experiment of the Zhongtian No. 1 continuous casting machine, the casting machine is a machine with five flows, the section size of the continuous casting billet is 220mm multiplied by 260mm, the continuous casting billet is made of GCr15 bearing steel, the superheat degree of a tundish is 25 ℃, a pulse harmonic magnetic field coil is a single-layer spring coil, the number of turns is 15, the continuous harmonic magnetic field coil is arranged at a position 0.5m below a crystallizer, and a motor coil fixed on the periphery of a packaging shell is arranged at a position 5m below the pulse harmonic magnetic field coil. The 1 flow is a comparison experiment, no treatment is carried out, and the 5 flow is treated by a method of combining a pulse harmonic magnetic field and a continuous harmonic magnetic field. Pulse harmonic magnetic field power supply parameters: the duty ratio of the pulse harmonic voltage 450V is 21%, the frequency is 29Hz, and the central magnetic field intensity of the no-load coil is 5800 gauss; continuous harmonic magnetic field power supply parameters: the harmonic voltage is 350V, the central magnetic field intensity of the no-load coil is 3400 gauss, and the frequency is 8 Hz.
The specific process comprises the following steps: and (3) starting cooling water before the continuous casting experiment, cooling the coil and the lead, and setting power supply starting parameters by using an upper computer. And starting a casting experiment of the tundish melt, continuously pulling the continuous casting slab downwards to pass through the pulse harmonic magnetic field coil and the continuous harmonic magnetic field coil, starting the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply to process, observing the superheat degree of the tundish melt in real time, and ensuring that the superheat degree is maintained at 25 +/-1 ℃. And after 45 minutes, the pouring of the tundish melt is finished, and the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply are stopped. And (3) when the experiment is carried out for 25 minutes, taking a section of continuous casting billet sample with the length of 300mm at the flow 1 and the flow 5 respectively, and finally carrying out metallographic structure observation and carbon distribution detection on the sample.
The detection shows that the isometric crystal area increase rate of the GCr15 bearing steel macrostructure treated by the method of applying the pulse harmonic magnetic field and the continuous harmonic magnetic field is up to 25.6% compared with the untreated GCr15 bearing steel macrostructure, and the center carbon segregation index is reduced from 1.18 to 1.03. Meanwhile, the center of the sample treated by the combination method of the pulse harmonic magnetic field and the continuous harmonic magnetic field is a fine isometric crystal structure.
Example 2
The experimental procedure was as follows: in the experiment of the Zhongtian No. 1 continuous casting machine, the casting machine is a machine with five flows, the section size of the continuous casting billet is 220mm multiplied by 260mm, the continuous casting billet is made of 20CrMnTi gear steel, the superheat degree of a tundish is 30 ℃, a pulse harmonic magnetic field coil is a single-layer spring coil, the number of turns is 15, the continuous harmonic magnetic field coil is arranged at the position of 0.5m below a crystallizer, and the continuous harmonic magnetic field coil is a motor coil fixed on the periphery of a packaging shell and is arranged at the position of 5m below the pulse harmonic magnetic field coil. The 1 flow is a comparison experiment, no treatment is carried out, and the 5 flow is treated by a method of combining a pulse harmonic magnetic field and a continuous harmonic magnetic field. Pulse harmonic magnetic field power supply parameters: pulse harmonic voltage 400V, duty ratio 21%, frequency 22Hz, no-load coil central magnetic field intensity 4900 Gauss; continuous harmonic magnetic field power supply parameters: the harmonic voltage is 280V, the central magnetic field intensity of the no-load coil is 2850 gauss, and the frequency is 6 Hz.
The specific process comprises the following steps: and (3) starting cooling water before the continuous casting experiment, cooling the coil and the lead, and setting power supply starting parameters by using an upper computer. And starting a casting experiment of the tundish melt, continuously pulling the continuous casting slab downwards to pass through the pulse harmonic magnetic field coil and the continuous harmonic magnetic field coil, starting the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply to process, observing the superheat degree of the tundish melt in real time, and ensuring that the superheat degree is maintained at 30 +/-1 ℃. And after 45 minutes, the pouring of the tundish melt is finished, and the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply are stopped. And (3) when the experiment is carried out for 25 minutes, taking a section of continuous casting billet sample with the length of 300mm at the flow 1 and the flow 5 respectively, and finally carrying out metallographic structure observation and carbon distribution detection on the sample.
The detection shows that the isometric crystal area increasing rate of the 20CrMnTi gear steel macrostructure processed by applying the pulse harmonic magnetic field and continuous harmonic magnetic field combined method reaches 104.86% compared with the untreated 20CrMnTi gear steel macrostructure, the central carbon segregation index is reduced from 1.26 to 0.94, and the center of the sample processed by the pulse harmonic magnetic field and continuous harmonic magnetic field combined method is a fine isometric crystal structure.
Example 3
The experimental procedure was as follows: in the experiment of the Zhongtian No. 1 continuous casting machine, the casting machine is a machine with five flows, the section size of the continuous casting billet is 220mm multiplied by 260mm, the continuous casting billet is made of ZTM-S2 high carbon tool steel, the superheat degree of a tundish is 25 ℃, a pulse harmonic magnetic field coil is a single-layer spring coil, the number of turns is 18, the continuous harmonic magnetic field coil is arranged at a position 1.3m below the crystallizer, a motor coil fixed on the periphery of a packaging shell is arranged at a position 4.5m below the pulse harmonic magnetic field coil. The 1 flow is a comparison experiment, no treatment is carried out, and the 5 flow is treated by a method of combining a pulse harmonic magnetic field and a continuous harmonic magnetic field. Pulse harmonic magnetic field power supply parameters: the pulse harmonic voltage is 450V, the duty ratio is 21 percent, the frequency is 33Hz, and the central magnetic field intensity of the no-load coil is 6000 gauss; continuous harmonic magnetic field power supply parameters: the harmonic voltage is 370V, the central magnetic field intensity of the no-load coil is 3650 Gauss, and the frequency is 7 Hz.
The specific process comprises the following steps: and (3) starting cooling water before the continuous casting experiment, cooling the coil and the lead, and setting power supply starting parameters by using an upper computer. And (3) starting a casting experiment of the tundish melt, continuously pulling out the continuous casting blank downwards to pass through the pulse harmonic magnetic field coil and the continuous harmonic magnetic field coil, starting the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply to process, observing the superheat degree of the tundish melt in real time, and ensuring that the superheat degree is maintained at 25 +/-1 ℃. And after 45 minutes, the pouring of the tundish melt is finished, and the pulse harmonic magnetic field power supply and the continuous harmonic magnetic field power supply are stopped. And (3) when the experiment is carried out for 25 minutes, taking a section of continuous casting billet sample with the length of 300mm at the flow 1 and the flow 5 respectively, and finally carrying out metallographic structure observation and carbon distribution detection on the sample.
The detection finds that the isometric crystal area increase rate of the ZTM-S2 high-carbon tool steel macrostructure treated by the method of applying the pulse harmonic magnetic field and the continuous harmonic magnetic field is 55.64% compared with the untreated ZTM-S2 high-carbon tool steel macrostructure, and the center carbon segregation index is also obviously reduced; meanwhile, the center of the sample treated by the combination method of the pulse harmonic magnetic field and the continuous harmonic magnetic field is a fine isometric crystal structure.
Table 1 shows the cross-sectional carbon content distribution and carbon segregation index of a five-point sampling GCr15 bearing steel continuous casting slab
Table 2 shows the distribution of carbon content and carbon segregation index of the cross section of 20CrMnTi gear steel continuous casting slab sampled by the five-point method
Claims (8)
1. The utility model provides a continuous casting billet homogenizing device, the device includes pulse harmonic magnetic field power (1), continuous harmonic magnetic field power (2), conticaster (4), cooling water outlet (7), cooling water inlet (8), crystallizer (9), host computer (10), middle package (11), pulse harmonic magnetic field coil (12), first encapsulation shell (13), continuous harmonic magnetic field coil (14), second encapsulation shell (15), its characterized in that:
the pulse harmonic magnetic field coil (12) is placed in a first packaging shell (13), the continuous harmonic magnetic field coil (14) is placed in a second packaging shell (15), and a cooling water outlet (7) and a cooling water inlet (8) are respectively welded outside the first packaging shell (13) and the second packaging shell (15); the crystallizer (9) is fixed at the top end of the continuous casting machine (4), the tundish (11) is positioned above the crystallizer (9), and the first packaging shell (13) is arranged below the crystallizer (9) and fixed on the continuous casting machine (4); the second packaging shell (15) is fixed at the tail end of the casting machine (4);
the upper computer (10) is respectively connected with the pulse harmonic magnetic field power supply (1) and the continuous harmonic magnetic field power supply (2), the pulse harmonic magnetic field power supply (1) is connected with the pulse harmonic magnetic field coil (12), and the continuous harmonic magnetic field power supply (2) is connected with the continuous harmonic magnetic field coil (14).
2. A slab homogenizing device according to claim 1, characterized in that it further comprises water cooled cables or copper tubes (5), copper or aluminium wires (6); the pulse harmonic magnetic field power supply (1) is connected with the pulse harmonic magnetic field coil (12) through a water-cooled cable or a copper pipe (5), and the continuous harmonic magnetic field power supply (2) is connected with the continuous harmonic magnetic field coil (14) through a copper wire or an aluminum wire (6).
3. A slab homogenizing device according to claim 1 or 2, characterized in that the first enclosure (13) is placed 0.5-5 m below the crystallizer (9) of the continuous casting machine.
4. A slab homogenizing device according to claim 1 or 2, characterized in that the upper machine (10) is connected to the pulse harmonic magnetic field power supply (1) and the continuous harmonic magnetic field power supply (2) respectively by ethernet.
5. A slab homogenizing device according to claim 1 or 2, characterized in that the pulse harmonic field coils (12) are spring-like coils, and the spring coils and the inner opening of the first enclosure (13) are any one of circular, square and polygonal in shape.
6. A slab homogenizing device according to claim 5, characterized in that the number of layers of the pulse harmonic magnetic field coils (12) is 1-4, and the number of turns is 2-200.
7. A slab homogenizing device according to claim 1 or 2, characterized in that the distance between the first enclosure (13) and the second enclosure (15) on the continuous casting machine (4) is between 1m and 6 m.
8. A slab homogenizing device according to claim 1 or 2, characterized in that the pulse harmonic field coils (12) are spring-like coils wound from copper or aluminium tubes, and the continuous harmonic field coils (14) are a plurality of motor coils wound from copper or aluminium wires and placed around the second enclosure (15), respectively.
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| CN201921082868.5U CN210648413U (en) | 2019-07-11 | 2019-07-11 | Continuous casting billet homogenizing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110181010A (en) * | 2019-07-11 | 2019-08-30 | 上海大学 | A kind of continuous casting billet homogenizing apparatus and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110181010A (en) * | 2019-07-11 | 2019-08-30 | 上海大学 | A kind of continuous casting billet homogenizing apparatus and method |
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