A continuous casting machine and a continuous casting process capable of simultaneously producing different cross-section continuous casting billets

Abstract

The application discloses a continuous casting machine and a continuous casting process capable of simultaneously producing continuous casting billets with different sections. The continuous casting machine comprises a tundish, a submerged nozzle, a crystallizer copper pipe, a vibrating crystallizer, a spraying section, a secondary cooling chamber and a dummy bar in sequence according to the moving direction of the continuous casting billets. The tundish is provided with at least two groups. Each group of the tundish is provided with a plurality of submerged nozzles corresponding to the size of the section. Each group of the submerged nozzles is correspondingly provided with a group of crystallizer copper pipes corresponding to the size. Each group is correspondingly provided with a group of vibrating crystallizers, a spraying section, a secondary cooling chamber and a dummy bar. Each spraying section is provided with at least four groups of spraying assemblies. The secondary cooling chamber is provided with a gas mist cooling device. The application has the advantages that the continuous casting process of the double tundish is realized by adjusting the device structure and process parameters, the quality of the continuous casting billet products is stable, and the operation rate of the continuous casting machine and the material yield of the continuous casting billet are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous casting, in particular to a continuous casting machine and a continuous casting process capable of simultaneously producing continuous casting billets with different sections. BACKGROUND

[0002] In the continuous casting area of a steel mill, a continuous casting machine continuously casts high-temperature molten steel in a ladle into continuous casting billets with a certain section shape and size through a tundish and a mold. The continuous casting billets are straightened by a secondary cooling and a straightening machine, cut into a certain size by a flame cutting, and then stacked in a designated area after passing through a roller and a cooling bed. However, the stop of the continuous casting machine will reduce the operation rate of the continuous casting machine, and the replacement of the tundish for the start of pouring will cause the cutting of the head and tail of the continuous casting billets and a large amount of scrap billets due to the remaining pouring of the tundish.

[0003] In order to improve the operation rate of the continuous casting machine, people generally use methods such as improving the service life of the tundish of the continuous casting machine and using longer service life continuous casting three major components to improve the operation rate of the continuous casting machine. However, when the order plan is small and the steel grade is the same, and the steel grade is the same and the rolling specifications of the continuous casting billets are different, the pouring is stopped in advance and the next steel grade is replaced, the more orders, the more groups are replaced, which causes the operation rate of the continuous casting machine to suddenly decrease and a large amount of billets to be scrapped.

[0004] To solve the above problems, the multi-stream small square billet tundish with publication number CN205599909U mainly replaces different retaining walls in the tundish when producing different steel grades, so that the continuous casting machine can produce different grades of steel. However, it is not able to produce continuous casting billets of different section sizes of rod and wire when producing the same steel grade.

[0005] Therefore, the continuous casting machine with publication number CN111014604A can quickly and accurately cast steel into a shape, and can realize automatic control. However, it is not able to simultaneously produce continuous casting billets of different section sizes of rod and wire. SUMMARY

[0006] The purpose of the present application is to provide a continuous casting machine and a continuous casting process capable of simultaneously producing continuous casting billets with different sections. By adjusting the structure of the device and the process parameters, the continuous casting process of double tundishes is realized, the quality of the continuous casting billet products is ensured to be stable, and the operation rate of the continuous casting machine and the billet yield are greatly improved.

[0007] The above technical purpose of the present application is realized by the following technical scheme:

[0008] A continuous casting machine capable of simultaneously producing different section continuous casting billets, characterized in that it comprises, in sequence in the moving direction of the continuous casting billets, a tundish, a submerged nozzle, a copper crystallizer tube, a vibrating crystallizer, a spraying section, a secondary cooling chamber and an ingot rod, the tundish is provided with at least two groups, each group of the tundish is provided with a plurality of submerged nozzles corresponding to the size of the section, each group of the submerged nozzles is correspondingly provided with a group of copper crystallizer tubes corresponding to the size, each group is correspondingly provided with a group of vibrating crystallizers, a spraying section, a secondary cooling chamber and an ingot rod, at least four groups of spraying assemblies are provided in each spraying section, and an air mist cooling device is used in the secondary cooling chamber.

[0009] Preferably, an electromagnetic induction heating device is arranged in each group of the tundish, and the electromagnetic induction heating device adjusts the heating according to the cooling speed of the continuous casting billets at different pulling speeds.

[0010] Preferably, an electromagnetic stirring system is further arranged between the secondary cooling chamber and the ingot rod, and the electromagnetic stirring system comprises a primary end stirring device and a terminal end stirring device.

[0011] Preferably, four groups of adjusting fixed rods are arranged in the spraying section, the spraying assemblies are slidably fixed along the adjusting fixed rods to realize spacing adjustment, the spraying assemblies comprise an adjusting frame and a spraying head, the adjusting frame is rectangular, four groups of sliding rods are mounted on the inner edge of the adjusting frame through fixing seats, each group of the sliding rods is arranged in parallel with the inner edge of the adjusting frame, a sliding seat is slidably arranged on each group of the sliding rods, an adjusting plate is slidably arranged in the sliding seat, the adjusting plate is arranged in vertical opposite to the sliding rods, the spraying head is arranged at one end of the adjusting plate on the inner side of the adjusting frame, and the continuous casting billets are arranged between the four groups of spraying heads.

[0012] Preferably, a slot nozzle is used for the nozzle of the spraying head, and the slot of the slot nozzle is arranged in vertical to the moving direction of the continuous casting billets.

[0013] Preferably, a transmission gear is rotatably arranged in the sliding seat, the transmission gear is driven by a motor, an adjusting groove is formed in the adjusting plate, and a tooth groove matched with the transmission gear is arranged in the adjusting groove.

[0014] Preferably, the adjusting seat slides up and down along the inner edge of the adjusting frame on one side, and the position of the adjusting seat is fixed relative to the inner edge of the adjusting frame through a limiting bolt on the bottom of the one side of the adjusting seat.

[0015] Preferably, the ingot rod is a flexible ingot rod.

[0016] A continuous casting process capable of simultaneously producing different section continuous casting billets, characterized in that it comprises the following steps:

[0017] Step 1: taking a section of 160x160mm 2Cross-section and 220x260mm 2 The crystallizer copper pipe of the cross-section is installed, the same high-temperature molten steel passes through the double tundish, and the molten steel flows into the crystallizer copper pipe of different cross-sections through each flow of the submerged nozzle;

[0018] Step 2, adjust the amplitude of the vibration crystallizer of different cross-sections, 160x160mm 2 The amplitude of the crystallizer copper pipe of the cross-section is-3~3mm, and the frequency is (100+40v)opm, 220x260mm 2 The amplitude of the crystallizer copper pipe of the cross-section is-2.5~2.5mm, and the frequency is (70+70v)opm;

[0019] Step 3, adjust the casting speed of the continuous casting machine of different cross-sections, 160x160mm 2 The casting speed of the cross-section is 1.55~1.75m / min, and 220x260mm 2 The casting speed of the cross-section is 0.70~0.80m / min, the water temperature difference of the spraying section and the distance from the spraying head to the continuous casting billet are adjusted respectively, and the parameters of the initial end stirring device and the terminal stirring device are adjusted respectively;

[0020] Step 4, the continuous casting billet is cooled in three sections by using the gas mist cooling method in the secondary cooling chamber, 160x160mm 2 The specific water quantity of the cross-section gas mist cooling is 0.40L / kg, and the water quantity distribution ratio of the three sections is 40%, 35% and 25%, 220x260mm 2 The specific water quantity of the cross-section gas mist cooling is 0.25L / kg, and the water quantity distribution ratio of the three sections is 44%, 33% and 23%;

[0021] Step 5, after the dummy bar is lowered to the specified position, the pouring is stopped, and after cutting, it is output to the holding pit for cooling, that is, the continuous casting process of simultaneously producing continuous casting billets of different cross-sections is completed.

[0022] Preferably, in step 3, 160x160mm 2 Cross-section and 220x260mm 2 The water temperature difference of the cross-section is 6.5~8.5℃, and the 160x160mm 2 The initial end stirring current of the cross-section is 200~220A, the frequency is 4.5~5.5Hz, the terminal stirring current is 390~410A, and the frequency is 5.5~6.5Hz, and the 220x260mm 2 The initial end stirring current of the cross-section is 290~310A, the frequency is 2.0~3.0Hz, the terminal stirring current is 290~310A, and the frequency is 5.5~6.5Hz.

[0023] In summary, the present application has the following beneficial effects:

[0024] When the same steel grade and different size specifications, cross-section shape continuous casting billet rolling special steel bar wire is needed to be produced, the present application can arrange the production of different cross-section shape continuous casting billets according to different user orders without stopping pouring in advance and without replacing the tundish group, and then rolling different special steel bar wire, which greatly improves the operation rate of the continuous casting machine, and reduces the scrap of a large number of continuous casting billets due to early replacement of the group.

[0025] By adjusting the optimal spray chamber cooling distance and the secondary cooling chamber cooling process parameters, the parameters can be adjusted in time for different cross-sections to improve the cooling effect, and the operation rate of the continuous casting machine and the continuous casting billet yield are greatly improved.

[0026] By the gas mist cooling method in the secondary cooling chamber, the uniform cooling of the continuous casting billet is ensured, and the stress cracks of the continuous casting billet caused by full water strong cooling are avoided.

[0027] To realize the steady-state pouring of the double tundish, the same molten steel needs to be produced at different cross-sections and stable speed, and when the tundish molten steel temperature is too low at a slow speed, the continuous casting is prone to low-temperature solidification, and by configuring the intermediate package electromagnetic induction heating technical equipment, the stability of the tundish molten steel temperature is realized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structure schematic diagram of the present application;

[0029] Figure 2 is the structure schematic diagram of the spray assembly in the present application;

[0030] Figure 3 is the connection structure schematic diagram of the sliding seat in the present application. EMBODIMENT

[0031] The specific embodiment of the present application will be further described below in combination with the drawings, and the present embodiment does not constitute a limitation on the present application.

[0032] As Figure 1The illustrated continuous casting machine capable of simultaneously producing different section continuous casting billets sequentially includes a tundish 1, a submerged nozzle 2, a copper crystallizer tube 3, a vibrating crystallizer 4, a spraying section 5, a secondary cooling chamber 6, and an ingot rod in the moving direction of the continuous casting billets. The tundish 1 is provided with at least two groups, and each group of tundish 1 is provided with multiple submerged nozzles 2 corresponding to the size of the section at the bottom. Each group of submerged nozzles 2 is correspondingly provided with a group of copper crystallizer tubes 3 of corresponding size below. Each group is correspondingly provided with a group of vibrating crystallizers 4, a spraying section 5, a secondary cooling chamber 6, and an ingot rod. Each spraying section 5 is provided with at least four groups of spraying assemblies, and the secondary cooling chamber 6 uses a gas mist cooling device. The gas mist cooling method in the secondary cooling chamber 6 ensures uniform cooling of the continuous casting billets, avoiding stress cracks in the continuous casting billets caused by full water intensive cooling. The ingot rod uses a flexible ingot rod.

[0033] Each group of tundish 1 is provided with an electromagnetic induction heating device. The electromagnetic induction heating device adjusts the heating according to the cooling speed of the continuous casting billets at different pulling speeds. To achieve stable casting of double tundishes, the same molten steel needs to be produced at different section speeds. When the tundish steel temperature is too low at a slow pulling speed, the continuous casting is more likely to be low-temperature dead. By configuring the tundish electromagnetic induction heating technology equipment, the stability of the tundish steel temperature is realized.

[0034] An electromagnetic stirring system 7 is also provided between the secondary cooling chamber 6 and the ingot rod. The electromagnetic stirring system 7 includes a primary end stirring device and a terminal end stirring device.

[0035] As shown in Figure 2 The spraying section 5 is provided with four groups of adjusting fixing rods 51. The spraying assemblies are slidably fixed along the adjusting fixing rods 51 to achieve spacing adjustment. The spraying assemblies include an adjusting frame 52 and a spraying head 53. The adjusting frame 52 is rectangular. Four groups of sliding rods 54 are installed in the inner edge of the adjusting frame 52 through a fixed seat. Each group of sliding rods 54 is parallel to the inner edge of the adjusting frame 52. A sliding seat 55 is slidably arranged on each group of sliding rods 54. A adjusting plate 56 is slidably arranged in the sliding seat 55. The adjusting plate 56 is perpendicular to the sliding rod 54. The spraying head 53 is arranged at one end of the adjusting plate 56 inside the adjusting frame 52. The continuous casting billet is arranged between the four groups of spraying heads 53.

[0036] The nozzle of the spraying head 53 uses a slot nozzle. The slot of the slot nozzle is perpendicular to the moving direction of the continuous casting billet.

[0037] As shown in Figure 3 A transmission gear 57 is rotatably arranged inside the sliding seat 55. The transmission gear 57 is driven by a motor. An adjusting groove 58 is formed in the adjusting plate 56. A gear slot that cooperates with the transmission gear 57 is arranged in the adjusting groove 58.

[0038] The sliding seat 55 slides along the inner edge of the adjusting frame 52, and the bottom of the adjusting seat is fixed in position relative to the inner edge of the adjusting frame 52 by the limiting bolt 59.

[0039] A continuous casting process capable of simultaneously producing different section continuous casting billets, comprising the following steps:

[0040] Step 1: Take the section 160x160mm 2 Section and 220x260mm 2 The crystallizer copper pipe 3 of the section is installed, and the same package of high-temperature molten steel passes through the double tundish 1, and the molten steel flows into the crystallizer copper pipe 3 of different sections through each flow immersion nozzle 2.

[0041] Step 2: Adjust the amplitude of the vibration crystallizer 4 of different sections, 160x160mm 2 The amplitude of the crystallizer copper pipe 3 of the section is-3~3mm, and the frequency is (100+40v)opm, 220x260mm 2 The amplitude of the crystallizer copper pipe 3 of the section is-2.5~2.5mm, and the frequency is (70+70v)opm.

[0042] Step 3: Adjust the casting speed of the continuous casting machine for different sections, 160x160mm 2 The casting speed of the section is 1.55~1.75m / min, and 220x260mm 2 The casting speed of the section is 0.70~0.80m / min, the water temperature difference of the spraying section 5 and the distance from the spraying head 53 to the continuous casting billet are adjusted respectively, and the parameters of the initial end stirring device and the terminal end stirring device are adjusted respectively, 160x160mm 2 Section and 220x260mm 2 The water temperature difference of the section is 6.5~8.5℃, 160x160mm 2 The initial end stirring current of the section is 200~220A, the frequency is 4.5~5.5Hz, the terminal end stirring current is 390~410A, and the frequency is 5.5~6.5Hz, 220x260mm 2 The initial end stirring current of the section is 290~310A, the frequency is 2.0~3.0Hz, the terminal end stirring current is 290~310A, and the frequency is 5.5~6.5Hz.

[0043] Step 4: The continuous casting billet is cooled in three stages by using the gas mist cooling method in the secondary cooling chamber 6, 160x160mm 2 The specific water consumption of the section gas mist cooling is 0.40L / kg, and the water consumption distribution ratio of the three-stage cooling is 40%, 35% and 25%, 220x260mm 2The specific water quantity of the section gas mist cooling is 0.25 L / kg, wherein the water quantity distribution ratio of the three-stage cooling is 44%, 33% and 23%.

[0044] Step 5, the dummy bar is lowered to a specified position, then the pouring is stopped, and after subsequent cutting, the product is output to a holding pit for cooling, thereby completing the continuous casting process of simultaneously producing different section shapes.

[0045] When it is required to produce different size specifications, section shapes of the same steel grade, and special steel bars and wires, the present application can directly arrange the production of different section shapes according to different user orders without stopping pouring in advance or replacing the tundish group, thereby rolling different special steel bars and wires, greatly improving the operation rate of the continuous casting machine, and reducing the scrap of a large amount of cast slabs due to early replacement of the group, cutting head, cutting tail, and tundish allowance.

[0046] By adjusting the optimal spray chamber cooling distance and the two cooling chamber cooling process parameters, the parameters of different sections can be timely adjusted, the cooling effect is improved, and the operation rate of the continuous casting machine and the cast slab yield are greatly improved.

[0047] The above description is only a preferred embodiment of the present application and is not used to limit the present application. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered as falling within the protection scope of the technical scheme of the present application.

Claims

1. A continuous caster capable of simultaneously producing different cross-section continuous cast slabs, characterized in that, According to the moving direction of the continuous casting blank, the tundish, the submerged nozzle, the crystallizer copper pipe, the vibrating crystallizer, the spraying section, the secondary cooling chamber and the dummy bar are sequentially arranged, the tundish is provided with at least two groups, the bottom of each group of the tundish is provided with a plurality of groups of submerged nozzles corresponding to the section size, the bottom of each group of the submerged nozzles is correspondingly provided with a group of crystallizer copper pipes corresponding to the size, each group is correspondingly provided with a group of vibrating crystallizers, a spraying section, a secondary cooling chamber and a dummy bar, at least four groups of spraying assemblies are arranged in each spraying section, and the gas mist cooling device is arranged in the secondary cooling chamber; The spraying section is provided with four groups of adjusting fixing rods, the spraying assemblies are slidably fixed along the adjusting fixing rods to realize spacing adjustment, the spraying assembly comprises an adjusting frame and a spraying head, the adjusting frame is rectangular, four groups of sliding rods are arranged in the inner edge of the adjusting frame through the fixing seat, each group of the sliding rods is arranged in parallel with the inner edge of the adjusting frame, a sliding seat is slidably arranged on each group of the sliding rods, a adjusting plate is slidably arranged in the sliding seat, the adjusting plate is arranged in vertical with the sliding rod, the spraying head is arranged at one end of the adjusting plate on the inner side of the adjusting frame, and the continuous casting blank is arranged between the four groups of spraying heads; A transmission gear is rotatably arranged in the sliding seat, the transmission gear is driven by the motor, an adjusting groove is formed in the adjusting plate, and a gear groove matched with the transmission gear is arranged in the adjusting groove; The sliding seat slides up and down along the inner edge of the adjusting frame on one side, and the position of the sliding seat on one side is fixed relative to the inner edge of the adjusting frame through the limiting bolt.

2. A continuous caster capable of simultaneously producing continuously cast blooms of different cross-sections according to claim 1, characterized in that: An electromagnetic induction heating device is arranged in each group of the tundish, and the electromagnetic induction heating device adjusts the heating according to the cooling speed of the continuous casting blank at different pulling speeds.

3. A continuous caster capable of simultaneously producing continuously cast blooms of different cross-sections according to claim 1, characterized in that: An electromagnetic stirring system is further arranged between the secondary cooling chamber and the dummy bar, and the electromagnetic stirring system comprises a primary end stirring device and a terminal end stirring device.

4. A continuous caster capable of simultaneously producing continuously cast blooms of different cross-sections according to claim 1, characterized in that: The nozzle of the spraying head adopts a slot nozzle, and the slot of the slot nozzle is arranged in vertical with the moving direction of the continuous casting blank.

5. A continuous caster capable of simultaneously producing continuously cast blooms of different cross sections according to claim 1, characterized in that: The dummy bar adopts a flexible dummy bar.

6. A continuous casting process for a continuous caster capable of simultaneously producing continuously cast blooms of different cross-sections according to any one of claims 1 to 5, characterised in that, The method comprises the following steps: Step 1, take section 160x160mm 2 Section with 220x260mm 2 The section of the copper pipe of the crystallizer is installed, the same high-temperature molten steel passes through the double tundish, and the molten steel flows into the copper pipe of the crystallizer of different sections through each flow of the submerged nozzle. Step 2, adjust the amplitude of the different cross-section of the vibration crystallizer, 160x160mm 2 The amplitude of the cross-section of the crystallizer copper pipe is -3~3mm, the frequency is (100+40v)opm, 220x260mm 2 The amplitude of the cross-section of the crystallizer copper pipe is -2.5~2.5mm, the frequency is (70+70v)opm; Step 3, the casting machine adjusts the different section speed, 160x160mm 2 The section speed is 1.55-1.75m / min, 220x260mm 2 The section speed is 0.70-0.80m / min, respectively adjust the water temperature difference of the spraying section and the distance from the spraying head to the continuous casting blank, and respectively adjust the parameters of the initial end stirring device and the terminal stirring device; Step 4, the continuous casting billet is cooled by using air-atomizing cooling method in the secondary cooling chamber in three sections, 160 x 160 mm 2 The specific water quantity of air-atomizing cooling is 0.40 L / kg, wherein the water quantity distribution ratio of three sections is 40%, 35% and 25%, 220 x 260 mm 2 The specific water quantity of air-atomizing cooling is 0.25 L / kg, wherein the water quantity distribution ratio of three sections is 44%, 33% and 23%. Step 5, after the dummy bar is lowered to the specified position, the pouring is stopped, and after cutting, the continuous casting blank is output to the holding pit for cooling, and the continuous casting process for simultaneously producing continuous casting blanks with different sections is completed.

7. A continuous casting process for a continuous caster capable of simultaneously producing continuously cast blooms of different cross-sections according to claim 6, characterised in that, 160x160mm 2 Cross-section and 220x260mm 2 Cross-section water temperature difference is 6.5~8.5℃, the 160x160mm 2 Cross-section initial end stirring current is 200~220A, frequency is 4.5~5.5Hz, end stirring current is 390~410A, frequency is 5.5~6.5Hz, the 220x260mm 2 Cross-section initial end stirring current is 290~310A, frequency is 2.0~3.0Hz, end stirring current is 290~310A, frequency is 5.5~6.5Hz.

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