Horizontal continuous casting device for large-section tube blank

Abstract

The utility model relates to a horizontal continuous casting device for a large-section tube blank, which comprises a tundish (2) and a sliding nozzle (3), and the large-section tube blank is provided with a horizontal axis positioned below the sliding nozzle (3). The continuous casting device is coaxially provided with an inner crystallizer (4), an inner wall secondary cooling component (5), a molten steel stabilizer (6), a fixed water gap (9), a dummy bar head (14), an outer crystallizer (15) and a dummy bar (16) along the horizontal axis, and a throwing device (17) and an outer wall secondary cooling component (18) are arranged on the outer side of the dummy bar (16). The fixed water gap and the molten steel stabilizer are provided with the heating coil, and the inner wall secondary cooling part is used for cooling the dummy bar head during casting, so that a large-section pipe blank can be produced in a horizontal movement state; the large-section tube blank continuous casting device is simple, is not provided with a tall plant of a vertical continuous casting machine, does not need a complicated driving system and a blank ejection system, and can greatly save the overall investment of equipment.

Description

Technical Field

[0001] The utility model belongs to the field of steel continuous casting, in particular to a horizontal continuous casting device for large-section tube blanks. Background Art

[0002] With the development of continuous casting technology, the technology of using square (round) billet continuous casting machine to produce strip products and using 150-250mm thick continuous casting slabs to produce plates has gradually matured, but there are problems such as large processing volume, high energy consumption, long production cycle and high cost from the billet to the final product. There is a trend to further reduce the section of strip products or directly continuously cast special-shaped billets, and there is still a need to further thin the slabs.

[0003] Near-net-shape continuous casting is a major high-tech in the development of modern steel industry, and is also a hot technology in the current world steel industry. It includes thin slab continuous casting and rolling, strip steel continuous casting, profiled billet continuous casting, tube billet continuous casting, wire casting and rolling, and spray deposition. Near-net-shape continuous casting is to strive to cast billets as close to the final product size as possible, so as to further reduce intermediate processing procedures, save energy, reduce storage and shorten production time. Compared with traditional processes, these technologies have short processes, simple equipment, low construction investment, low energy consumption, high success rate and low production cost.

[0004] The continuous casting method can greatly reduce the intermediate processes of producing large-section tube billets, and at the same time obtain a better inner wall structure. To this end, metallurgical scientists have developed various types of tube billet continuous casting machines, but the application of the technology is limited due to the complexity of the equipment, the high cost of equipment and the overall investment in the plant.

[0005] Horizontal continuous casting is relatively mature in the production of non-ferrous metals, and has certain applications in the field of steel continuous casting production. However, compared with arc continuous casting, horizontal continuous casting of steel has a relatively single alloy variety, low output, and is only used in the production of small-section steel billets (most of the existing horizontal continuous casting machine casting section diameters are 70 to 180 mm, and the maximum does not exceed 300 mm).

[0006] Large-section tube billets with a diameter of more than 800 mm are used for pipe threading. There are fewer alloy varieties, limited production demand, thin wall thickness, and certain requirements for the inner wall quality. Horizontal continuous casting can just meet such needs.

[0007] The exploration of producing steel tube billets by continuous casting has been going on for many years, such as Chinese patents CN116652141A "A production device and production method for hollow continuous casting billets" and CN1350894A "A tube billet continuous casting machine", both of which use arc continuous casting to produce tube billets; CN106424612A "A tube crystallizer and continuous casting and rolling tube production line", CN100999013A "A vertical seamless steel tube hollow tube billet continuous casting machine", CN102773428A "Casting device and method for large-section continuous casting billets" "Casting Method", CN102416449A "A Continuous Casting Steel Pipe Equipment", CN102019391A "A Continuous Casting Steel Pipe Equipment", CN102773430A "Large Section Hollow Pipe Continuous Casting Device and Casting Method", CN1380153A "A Hollow Metal Pipe Electromagnetic Continuous Casting Method", all of which are produced in a vertical manner; CN102626771A "Hollow Pipe Water-Cooled Casting Method and Device" is produced by water-cooled mold casting, which is not continuous. In addition, other explorations involving horizontal continuous casting of pipe billets are in the field of non-ferrous metals or the production of composite pipe billets, which cannot be applied to large-section pipe billets. Summary of the invention

[0008] The utility model aims to provide a horizontal continuous casting device for large-section pipe billets, which provides cooling on a horizontally moving ingot starter and provides heating coils on a molten steel stabilizer and a fixed water nozzle, and can be used to produce large-section steel pipe billets in a horizontal state.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A large-section tube billet horizontal continuous casting device, used for preparing steel tube billets, comprises a tundish 2 and a sliding nozzle 3, the large-section tube billet has a horizontal axis located below the sliding nozzle 3, the continuous casting device is coaxially arranged along the horizontal axis: an inner crystallizer 4, an inner wall secondary cooling component 5, a molten steel stabilizer 6, a fixed nozzle 9, a dummy head 14, an outer crystallizer 15 and a dummy rod 16, the outer side of the dummy rod 16 is provided with a billet drawing device 17 and an outer wall secondary cooling component 18; wherein:

[0011] The tundish 2 is connected to a horizontally arranged fixed nozzle 9 through a sliding nozzle 3 at the bottom. A molten steel stabilizer 6 is provided at one end of the fixed nozzle 9 to guide the molten steel into the interlayer between the inner crystallizer 4 and the outer crystallizer 15. A cavity having a tube cross-sectional shape forming a solidified shell 13 is provided between the outer crystallizer 15, the inner crystallizer 4 and the ingot starter 14.

[0012] The inner wall secondary cooling component 5 is connected to the ingot head 14 via a follower cylinder 19 and a plurality of telescopic sleeves. The inner wall secondary cooling component 5 moves horizontally synchronously with the ingot head 14 under the action of the follower cylinder 19. A billet drawing device 17 for driving the ingot rod 16 is arranged on the outer side of the ingot rod 16. The ingot rod 16 moves out of the inner and outer crystallizers with the ingot head 14 and the solidified shell 13. When the casting reaches the maximum stroke of the follower cylinder 19, the inner wall secondary cooling component 5 is separated from the ingot head 14. Then, the solidified shell 13 is finally completely solidified under the joint action of the inner wall secondary cooling component 5 and the outer wall secondary cooling component 18 to form a large-section tube blank.

[0013] The molten steel stabilizer 6 is provided with a stabilizer heating coil 7 .

[0014] The fixed water inlet 9 is provided with a fixed water inlet heating coil 10 .

[0015] The inner wall secondary cooling component 5 comprises a follower cylinder 19, a fixed cooling medium return pipe 20, a telescopic cooling medium inlet pipe 21 and a nozzle 22, and is used to provide cooling medium to the ingot starter 14 from the beginning of casting.

[0016] The stroke of the inner wall secondary cooling component 5 and the ingot starter head 14 following the hydraulic cylinder is 500 to 3000 mm and moves synchronously.

[0017] A one-way valve is provided at the connection position between the inner wall secondary cooling component 5 and the ingot starter head 14. When the inner wall secondary cooling component 5 is connected to the ingot starter head 14, the one-way valve automatically opens, and part of the coolant flows into the ingot starter head 14 to cool the ingot starter head, and part of the coolant directly cools the inner wall of the tube blank. When the inner wall secondary cooling component (5) is separated from the ingot starter head (14), the one-way valve is closed, so that the inner wall secondary cooling component 5 can continue to cool the inner wall of the tube blank after being separated from the ingot starter head 14.

[0018] The device is used to produce large-section steel tube billets in a horizontal state, with an inner diameter of 500 to 2000 mm and a wall thickness of 40 to 150 mm.

[0019] The inner wall secondary cooling component 5 uses liquid metal as a cooling medium, and the outer wall secondary cooling device 18, the inner crystallizer 4 and the outer crystallizer 15 use cooling water as a cooling medium.

[0020] The billet drawing device 17 is a driving roller symmetrically arranged above and below the dummy rod 16 .

[0021] The molten steel flows vertically in the sliding nozzle 3 , and flows horizontally in the fixed nozzle 9 .

[0022] Compared with the prior art, the beneficial technical effects of the utility model are:

[0023] The device does not require a specially built tall factory building, has a simple equipment composition, a low overall equipment cost, and is relatively easy to implement.

[0024] This device meets the requirements of the tube blank for the inner wall quality.

[0025] The cooling medium of the inner wall cooling device of the device adopts liquid metal as the medium, and the system safety is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the composition of the large-section tube blank horizontal continuous casting device of the utility model;

[0027] Figure 2 yes Figure 1 A schematic structural diagram of the secondary cooling component 5 on the inner wall;

[0028] Figure 3 yes Figure 1 A schematic structural diagram of the middle ingot head 14.

[0029] Reference numerals:

[0030] 1 Molten steel in tundish 2 Tundish

[0031] 3 Sliding gate 4 Internal crystallizer

[0032] 5Inner wall secondary cooling component 6Steel liquid stabilizer

[0033] 7 Stabilizer heating coil 8 Molten steel in the crystallizer

[0034] 9 Fixed water inlet 10 Fixed water inlet heating coil

[0035] 11 separation ring 12 airtight ring

[0036] 13 solidified shell 14 ingot starter

[0037] 15 external crystallizer 16 dummy rod

[0038] 17 driving device 18 outer wall secondary cooling component

[0039] 19 Follower cylinder 20 Fixed cooling medium return pipe

[0040] 21 telescopic cooling medium inlet pipe 22 nozzle

[0041] 23 Ingot head cooling chip pin 24 Connecting pin DETAILED DESCRIPTION

[0042] like Figure 1 to Figure 3As shown, a large-section pipe blank horizontal continuous casting device of the utility model is an independent device for producing large-section pipe blanks, including a tundish 2, a sliding water nozzle 3, an internal crystallizer 4, an inner wall secondary cooling component 5, a molten steel stabilizer 6, a stabilizer heating coil, a fixed water nozzle 9, a fixed water nozzle heating coil 10, a separation ring 11, an airtight ring 12, a starter head 14, an external crystallizer 15, a starter rod 16, a billet drawing device 17 and an outer wall secondary cooling component 18, and the starter head 14 has a cooling function.

[0043] The large-section tube blank prepared by the device is formed by horizontal movement. The large-section tube blank has a horizontal axis located below the sliding water nozzle 3. Coaxially arranged along the horizontal axis are: an inner crystallizer 4, an inner wall secondary cooling component 5, a molten steel stabilizer 6, a fixed water nozzle 9, a dummy head 14, an outer crystallizer 15 and a dummy rod 16.

[0044] A separation ring 11 for horizontal continuous casting is provided between the other end of the fixed water inlet 9 and the outer crystallizer 15 , and an airtight ring 12 for sealing is provided outside the separation ring 11 .

[0045] The starter head 14 is connected to the starter rod 16 via a connecting pin 24, and a starter head cooling pin 23 for cooling the molten steel is pre-welded on the starter head.

[0046] The tundish 2 receives the molten steel 1 in the tundish transported from the ladle, and opens the sliding water inlet 3 to allow the molten steel to flow into the fixed water inlet 9. Under the maintenance of the stabilizer heating coil 7 and the fixed water inlet heating coil 10, the molten steel flows smoothly through the molten steel stabilizer 6 into the cavity formed by the inner crystallizer 4, the outer crystallizer 15 and the ingot head 14, and forms a solidified shell 13 under the joint action of the crystallizer cooling water and the inner wall secondary cooling medium; the inner wall secondary cooling component 5 provides cooling medium for the ingot head 14 at the beginning of casting, and is synchronized with the ingot head 14 under the action of the follower cylinder 19. Under the drive of the billet drawing device 17, the ingot rod 16 moves out of the inner and outer crystallizers with the ingot head 14 and the solidified shell 13. When the casting reaches the maximum stroke of the follower cylinder 19, the inner wall secondary cooling component 5 is separated from the ingot head 14; then the solidified shell 13 is finally completely solidified under the joint action of the inner wall secondary cooling component 5 and the outer wall secondary cooling component 18 to form a large-section pipe blank.

[0047] The equipment is equipped with a molten steel stabilizer 6 with a heating coil;

[0048] The device is equipped with a fixed water inlet 9 with a heating coil;

[0049] The inner wall secondary cooling component 5 provides cooling medium for the ingot starter 14;

[0050] The inner wall secondary cooling component 5 and the ingot starter 14 can move synchronously within a certain distance;

[0051] After the inner wall secondary cooling component 5 is separated from the ingot starter 14, the inner wall of the tube blank can continue to be cooled;

[0052] The device can be used to produce large-section tube blanks in a horizontal state;

[0053] The cooling medium of the inner wall secondary cooling component 5 uses liquid metal as a medium, which can improve the safety of the system.

[0054] The hollow ingot can be transported outward by horizontally arranged rollers as production continues. When it reaches a certain length, it can be cut into the required fixed length as needed.

[0055] The cooling water of the inner and outer crystallizers can be cooled by conventional cooling towers and recycled; the liquid metal coolant used by the inner wall secondary cooling component 5 is collected, cooled and recycled; the secondary cooling water scattered from the outer wall is collected and returned to the cooling water pool, and the generated steam is collected and transported to the outside of the factory by the fan for discharge.

Claims

1. A large-section tube billet horizontal continuous casting device for preparing steel tube billets, comprising a tundish (2) and a sliding nozzle (3), characterized in that: The large-section tube blank has a horizontal axis located below the sliding nozzle (3), and the continuous casting device is coaxially arranged along the horizontal axis: an inner crystallizer (4), an inner wall secondary cooling component (5), a molten steel stabilizer (6), a fixed nozzle (9), a dummy head (14), an outer crystallizer (15) and a dummy rod (16), and a billet drawing device (17) and an outer wall secondary cooling component (18) are arranged outside the dummy rod (16); wherein: The tundish (2) is connected to a horizontally arranged fixed water inlet (9) through a sliding water inlet (3) at the bottom. A molten steel stabilizer (6) is provided at one end of the fixed water inlet (9) for guiding the molten steel into the interlayer between the inner crystallizer (4) and the outer crystallizer (15). A cavity having a cross-sectional shape of a tube blank forming a solidified shell (13) is provided between the outer crystallizer (15), the inner crystallizer (4) and the ingot starter (14). The inner wall secondary cooling component (5) is connected to the ingot head (14) via a follower cylinder (19) and a plurality of telescopic sleeves. The inner wall secondary cooling component (5) moves horizontally synchronously with the ingot head (14) under the action of the follower cylinder (19). A billet drawing device (17) for driving the ingot rod (16) is arranged on the outer side of the ingot rod (16); the ingot rod (16) moves the ingot head (14) and the solidified billet shell (13) out of the inner and outer crystallizers. When the casting reaches the maximum stroke of the follower cylinder (19), the inner wall secondary cooling component (5) is separated from the ingot head (14); then, the solidified billet shell (13) is finally completely solidified under the joint action of the inner wall secondary cooling component (5) and the outer wall secondary cooling component (18) to form a large-section billet.

2. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The molten steel stabilizer (6) is provided with a stabilizer heating coil (7).

3. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The fixed water inlet (9) is provided with a fixed water inlet heating coil (10).

4. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The inner wall secondary cooling component (5) comprises a follower cylinder (19), a fixed cooling medium return pipe (20), a telescopic cooling medium inlet pipe (21) and a nozzle (22), and is used to provide cooling medium to the ingot starter (14) from the beginning of casting.

5. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The stroke of the inner wall secondary cooling component (5) and the ingot starter head (14) follower cylinder (19) is synchronously moved between 500 and 3000 mm.

6. The large-section tube horizontal continuous casting device according to claim 1, characterized in that: A one-way valve is provided at the connection position between the inner wall secondary cooling component (5) and the ingot starter head (14). When the inner wall secondary cooling component (5) and the ingot starter head (14) are connected, the one-way valve automatically opens, part of the cooling liquid flows into the ingot starter head (14) to cool the ingot starter head, and part of the cooling liquid directly cools the inner wall of the tube blank. When the inner wall secondary cooling component (5) and the ingot starter head (14) are separated, the one-way valve is closed, so that the inner wall of the tube blank can continue to be cooled after the inner wall secondary cooling component (5) and the ingot starter head (14) are separated.

7. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The device is used to produce large-section steel tube billets in a horizontal state, with an inner diameter of 500 to 2000 mm and a wall thickness of 40 to 150 mm.

8. The large-section tube horizontal continuous casting device according to claim 1 is characterized in that: The inner wall secondary cooling component (5) uses liquid metal as a cooling medium, and the outer wall secondary cooling component (18), the inner crystallizer (4) and the outer crystallizer (15) use cooling water as a cooling medium.

9. The large-section tube horizontal continuous casting device according to claim 1, characterized in that: The billet drawing device (17) is a driving roller symmetrically arranged above and below the dummy rod (16).

10. The large-section tube blank horizontal continuous casting device according to claim 1, characterized in that: The molten steel flows vertically in the sliding nozzle (3), and the molten steel flows horizontally in the fixed nozzle (9).

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