An online quenching device for the horizontal section of a plate continuous casting machine

Abstract

This utility model relates to an online quenching device for the horizontal section of a plate continuous casting machine, belonging to the technical field of continuous casting equipment in the metallurgical industry. The technical solution includes a quenching section (1), a water spraying system (2), and a temperature control system (3). The quenching section (1) is set in the horizontal section of the plate continuous casting machine. A water collection pipe (5) is provided in the quenching section (1). Multiple nozzles (6) are on the water collection pipe (5), and the multiple nozzles (6) are evenly distributed on the top, bottom, and two sides of the slab (7). The water collection pipe (5) is connected to a metal hose (2-1), and the U-shaped metal hose (2-1) is connected to a cooling medium water tank (2-3). The cooling medium water tank (2-3) is connected to a power water tank (2-7) through an electric ball valve (2-6). The beneficial effects of this utility model are: it can spray water evenly on the top, bottom, and two sides of the slab, and by optimizing the cooling medium, it can effectively eliminate hot-sending cracks and improve the surface quality of the slab.

Description

Technical Field

[0001] This utility model relates to an online quenching device for the horizontal section of a plate continuous casting machine, belonging to the technical field of continuous casting equipment in the metallurgical industry. Background Technology

[0002] Hot charging and conveying of continuously cast billets has become an important technical indicator in the steel industry due to its significant advantages in energy saving, efficiency improvement, and cost reduction. This process not only significantly reduces energy consumption and increases metal yield, but also shortens production cycles and reduces plant floor space, demonstrating enormous potential in energy efficiency, production efficiency, and cost control. However, low-alloy steel medium-thick slabs are prone to surface micro-cracks during hot charging, known as hot charging cracks, which has become a key issue restricting its application.

[0003] The formation of hot-feeding cracks mainly stems from two factors: first, the asynchronous phase transformation caused by the temperature difference between the surface and interior of the billet, which in turn induces thermal and structural stresses; second, the precipitation of carbonitrides of elements such as Nb and Al at the austenite grain boundaries in low-alloy high-strength steel weakens the grain boundaries and increases high-temperature brittleness. These two factors combined make low-alloy high-strength steel continuously cast billets more prone to cracking during hot charging and hot-feeding processes.

[0004] Existing solutions mostly employ offline slow cooling to reduce the surface temperature of the cast billet and eliminate hot-feeding cracks. However, this method requires offline stacking, increasing production costs and affecting efficiency. Therefore, there is an urgent need for an online quenching device and process that can effectively eliminate hot-feeding cracks during continuous casting.

[0005] In the continuous casting process of slabs, the horizontal section is a critical area for cooling and solidification. Traditional cooling methods, such as natural cooling and water spray cooling, suffer from several drawbacks. Natural cooling is characterized by uneven cooling rates and poor quenching effects. Water spray cooling, relying on the casting machine's cooling water system, has limited cooling capacity and is affected by factors such as water flow distribution, temperature, and velocity. This results in uneven water spraying around the slab, inaccurate temperature control, and instability in the transmission system, leading to poor slab surface quality and high internal stress, making it difficult to meet the production requirements of high-quality slabs. Furthermore, the choice of cooling medium directly affects the quenching effect, making it difficult to effectively prevent surface cracks and internal stress, thus impacting the quenching outcome. Utility Model Content

[0006] The purpose of this invention is to provide an online quenching device for the horizontal section of a plate continuous casting machine, which can uniformly spray water on the top, bottom and two sides of the slab, and then effectively eliminate hot-feeding cracks by optimizing the cooling medium, improve the surface quality of the slab, and solve the problems existing in the background technology.

[0007] The technical solution of this utility model is: An online quenching device for the horizontal section of a plate continuous casting machine includes a quenching section, a water spray system, and a temperature control system, wherein: The quenching section is set in the horizontal section of the plate continuous casting machine. The quenching section is equipped with a water collection pipe with multiple nozzles on the water collection pipe. The multiple nozzles are evenly distributed on the top, bottom and two sides of the slab. The water spray system includes a metal hose, a high-pressure pump, a cooling medium water tank, and a power water tank. The water collection pipe is connected to the metal hose, the U-shaped metal hose is connected to the cooling medium water tank through the high-pressure water pump, and the cooling medium water tank is connected to the power water tank through an electric ball valve. The temperature control system includes temperature monitoring instruments, flow monitoring instruments, automatic flow regulating valves, and manual valves mounted on a metal flexible hose.

[0008] The metal hose in the water spray system has a U-shaped structure.

[0009] The cooling medium tank in the water spray system is equipped with an electric regulating valve and a one-way valve.

[0010] The cooling medium tank in the water spray system contains cooling water and polyethylene glycol aqueous solution.

[0011] The cooling medium tank in the water spray system also contains sodium silicate corrosion inhibitor, polyether silane defoamer, and benzotriazole rust inhibitor.

[0012] The beneficial effects of this utility model are: (1) By precisely controlling the temperature and spraying water evenly on the top, bottom and two sides of the slab, hot delivery cracks are effectively eliminated, and the surface quality and internal structural stability of the slab are improved. (2) The online quenching process reduces the offline slow cooling time, shortens the production cycle, and improves production efficiency; (3) Optimized cooling medium reduces energy consumption and environmental pollution. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the water spray system structure of this utility model; Figure 3 This is a schematic diagram of the temperature control system of this utility model; In the diagram: 1. Quenching section; 2. Water spraying system; 3. Temperature control system; 4. Monitoring system; 5. Water collection pipe; 6. Nozzle; 7. Slab. 2-1 Metal flexible hose; 2-2 High-pressure pump; 2-3 Cooling medium water tank; 2-4 Electric regulating valve; 2-5 Check valve; 2-6 Electric ball valve; 2-7 Power water tank; Temperature monitoring instrument 3-1; flow monitoring instrument 3-2; automatic flow regulating valve 3-3; manual valve 3-4. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] See attached document Figure 1-3 An online quenching device for the horizontal section of a plate continuous casting machine, comprising a quenching section 1, a water spray system 2, and a temperature control system 3, wherein: Quenching section 1 is set in the horizontal section of plate continuous casting machine. Quenching section 1 is equipped with water collection pipe 5, and multiple nozzles 6 are evenly distributed on the top, bottom and two sides of plate 7. The water spray system 2 includes a metal hose 2-1, a high-pressure pump 2-2, a cooling medium water tank 2-3, and a power water tank 2-7. The water collection pipe 5 is connected to the metal hose 2-1. The U-shaped metal hose 2-1 is connected to the cooling medium water tank 2-3 through the high-pressure water pump 2-2. The cooling medium water tank 2-3 is connected to the power water tank 2-7 through an electric ball valve 2-6. The temperature control system 3 includes a temperature monitoring instrument 3-1, a flow monitoring instrument 3-2, an automatic flow regulating valve 3-3, and a manual valve 3-4, all mounted on the metal flexible hose 2-1.

[0016] In this embodiment, refer to the appendix Figure 1-3 The device mainly consists of a quenching section 1, a water spray system 2, a temperature control system 3, and a monitoring system 4, wherein: As attached Figure 1 As shown, the quenching section 1 is located in the horizontal section of the slab continuous casting machine and is used for online quenching of the slab. The quenching section 1 is equipped with a water collection pipe 5, on which multiple nozzles 6 are evenly distributed and have adjustable angles. The multiple nozzles 6 are evenly distributed on the top, bottom and two sides of the slab 7 to ensure that the water mist can fully cover the surface of the slab 7.

[0017] As attached Figure 2 As shown, the water spray system 2 includes a metal hose 2-1, a high-pressure pump 2-2, a cooling medium water tank 2-3, an electric regulating valve 2-4, a check valve 2-5, an electric ball valve 2-6, and a power water tank 2-7. The metal hose 2-1 is U-shaped, with both ends connected to the water collection pipe 5. The U-shaped metal hose 2-1 is connected to the cooling medium water tank 2-3 via the high-pressure water pump 2-2. The cooling medium water tank 2-3 is connected to the power water tank 2-7 via the electric ball valve 2-6. The cooling medium water tank 2-3 is controlled by the electric regulating valve 2-4 and the check valve 2-5. The high-pressure water pump 2-2 pressurizes the water to 10-20 MPa and delivers it to the nozzles 6 through the metal hose 2-1 and the water collection pipe 5.

[0018] As attached Figure 3As shown, the temperature control system 3 includes a temperature monitoring instrument 3-1, a flow monitoring instrument 3-2, an automatic flow regulating valve 3-3, and a manual valve 3-4 installed on the U-shaped metal hose 2-1. Through the coordinated action of the temperature control system 3 and the high-pressure water pump 2-2, the water spray temperature can be precisely adjusted within the range of 10-30℃ to achieve the ideal quenching effect.

[0019] Appendix Figure 1 As shown, monitoring system 4 is set around quenching section 1 to monitor key parameters such as slab 7 temperature, water spray temperature and water volume in real time. The monitoring system is connected to the control equipment and control machine through electrical signals, which makes it convenient for operators to control and adjust the quenching process in real time.

[0020] As attached Figure 1 As shown, the cooling medium includes a 5%-10% polyethylene glycol aqueous solution, placed in cooling medium tank 2-3, and uniformly mixed into the high-pressure water before spraying. To improve the quenching effect, 0.1%-0.5% sodium silicate corrosion inhibitor, 0.01%-0.1% polyether silane defoamer, and 0.05%-0.2% benzotriazole rust inhibitor can also be added.

Claims

1. An online quenching device for the horizontal section of a plate continuous casting machine, characterized in that: It includes a quenching section (1), a water spray system (2), and a temperature control system (3), wherein: The quenching section (1) is set in the horizontal section of the plate continuous casting machine. The quenching section (1) is equipped with a water collection pipe (5) and multiple nozzles (6) on the water collection pipe (5). The multiple nozzles (6) are evenly distributed on the top, bottom and two sides of the slab (7). The water spray system (2) includes a metal hose (2-1), a high-pressure pump (2-2), a cooling medium water tank (2-3), and a power water tank (2-7). The water collection pipe (5) is connected to the metal hose (2-1). The U-shaped metal hose (2-1) is connected to the cooling medium water tank (2-3) through the high-pressure pump (2-2). The cooling medium water tank (2-3) is connected to the power water tank (2-7) through an electric ball valve (2-6). The temperature control system (3) includes a temperature monitoring instrument (3-1), a flow monitoring instrument (3-2), an automatic flow regulating valve (3-3), and a manual valve (3-4) installed on the metal hose (2-1).

2. The online quenching device for the horizontal section of a plate continuous casting machine according to claim 1, characterized in that: The metal hose (2-1) in the water spray system (2) has a U-shaped structure.

3. The online quenching device for the horizontal section of a plate continuous casting machine according to claim 1, characterized in that: The cooling medium water tank (2-3) in the water spray system (2) is equipped with an electric regulating valve (2-4) and a one-way valve (2-5).

4. The online quenching device for the horizontal section of a plate continuous casting machine according to claim 1, characterized in that: The cooling medium in the cooling medium tank (2-3) of the water spray system (2) is a polyethylene glycol aqueous solution.

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