Molten steel atmosphere protection device in converter tapping process

Abstract

The utility model discloses a molten steel atmosphere protection device in a converter tapping process, belongs to the technical field of converter tapping equipment, and is used for performing atmosphere protection on molten steel in the converter tapping process. According to the technical scheme, an argon blowing metal ring pipe is in a circular ring shape and installed at the outer end of a tapping hole, the diameter of the argon blowing metal ring pipe is larger than that of the tapping hole, the center of the argon blowing metal ring pipe coincides with the circle center of the tapping hole, a plurality of blowing openings are evenly distributed in the circumference of the argon blowing metal ring pipe, and the blowing openings face the molten steel tapping direction. The upper end of the circumference of the argon blowing metal ring pipe is connected with the gas outlet end of a gas inlet metal elbow, the gas inlet end of the gas inlet metal elbow is connected with a gas inlet hose, and the gas inlet hose is connected with an argon conveying pipeline. The device is simple in structure and convenient to use, can perform atmosphere protection on tapping steel flow in the tapping process of the converter, prevents molten steel from absorbing oxygen and nitrogen to form oxide and nitride inclusions, and ensures the pouring performance of the molten steel, rolling crack control and material purity.

Description

Technical Field

[0001] This utility model relates to a device for protecting the atmosphere of molten steel during the converter tapping process, and belongs to the technical field of converter tapping equipment. Background Technology

[0002] Currently, high-end steel grades have stringent requirements for the content of gases such as oxygen and nitrogen. When oxygen and nitrogen from the air enter the steel during the steelmaking process, they will cause secondary oxidation and nitrogen absorption in the molten steel, forming more oxides and nitrides, which seriously affect the casting performance of molten steel, the control of rolling cracks, and the purity of materials.

[0003] Currently, atmosphere protection for molten steel mainly focuses on atmosphere protection within the smelting furnace, protective pouring during continuous casting, and argon protection at the long nozzle. However, there are no atmosphere protection devices for molten steel during the converter tapping process. Although the converter tapping process is brief, the flowing steel from the high-temperature molten steel is completely exposed to the air, making it highly susceptible to oxygen and nitrogen absorption. Relying solely on bottom-blowing argon gas from the ladle cannot fully guarantee atmosphere protection throughout the entire tapping process. Therefore, gas protection for molten steel during converter tapping has become a crucial issue that needs to be addressed in high-end steel smelting. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a steel atmosphere protection device during the converter tapping process. This atmosphere protection device can protect the steel stream during the converter tapping process, prevent the molten steel from absorbing oxygen and nitrogen, forming oxide and nitride inclusions, and ensure the casting performance, rolling crack control and material purity of the molten steel.

[0005] The technical solution to the above technical problem is:

[0006] A steel atmosphere protection device for the steel tapping process in a converter comprises an argon blowing metal ring pipe, an inlet metal bend pipe, and an inlet hose. The argon blowing metal ring pipe is circular and installed at the outer end of the tapping port. The diameter of the argon blowing metal ring pipe is larger than the diameter of the tapping port. The plane of the argon blowing metal ring pipe is perpendicular to the axial direction of the tapping port, and the center of the argon blowing metal ring pipe coincides with the center of the tapping port. Multiple blowing ports are evenly distributed around the circumference of the argon blowing metal ring pipe, and the blowing ports face the direction of steel tapping. The upper end of the circumference of the argon blowing metal ring pipe is connected to the outlet end of the inlet metal bend pipe, the inlet end of the inlet metal bend pipe is connected to the inlet hose, and the inlet hose is connected to the argon gas delivery pipeline.

[0007] The above-mentioned steel atmosphere protection device in the converter tapping process has a clearance notch at the bottom of the argon blowing metal ring tube. The argon blowing metal ring tubes at both ends of the clearance notch are closed, and the argon blowing metal ring tubes form a C-shape. The circumferential arc of the clearance notch is 60°.

[0008] The steel atmosphere protection device in the above-mentioned converter tapping process has a pipe diameter of 35-45mm for the argon blowing metal ring pipe, and the radius of the argon blowing metal ring pipe is 30-50mm larger than the tapping port radius.

[0009] In the above-mentioned steel atmosphere protection device during the tapping process, the inlet metal bend is a 90-degree bend, the outlet of the inlet metal bend is welded and connected directly above the center line of the argon blowing metal ring pipe, and the inlet of the inlet metal bend is connected to the inlet hose by a quick-release connector.

[0010] The steel atmosphere protection device in the above-mentioned converter tapping process has six air blowing ports in the argon blowing metal ring pipe, with three on each side of the argon blowing metal ring pipe, and the diameter of the air blowing ports is 10-20mm.

[0011] The beneficial effects of this utility model are:

[0012] The argon-blowing metal ring pipe of this invention is installed at the front end of the steel tapping port, with the blowing port of the argon-blowing metal ring pipe facing the direction of the converter steel tapping. The argon blowing mode is turned on before the converter tapping. When the steel is tapped, argon is blown in the direction of the steel flow into the ladle. Under the Bernoulli effect around the steel flow and the action of blowing argon in the same direction on the outside of the steel flow, an argon protective layer is formed on the outside of the steel flow, which effectively isolates the high-temperature molten steel from contact with oxygen and nitrogen in the air during the tapping process, eliminating the problems of secondary oxidation and nitrogen addition of molten steel.

[0013] This utility model has a simple structure, is easy to install and use, and has low manufacturing cost. It can protect the atmosphere of the molten steel during the converter tapping process, ensuring the casting performance of the molten steel, the control of rolling cracks, and the purity of the material. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Side view.

[0016] The diagram is marked as follows: 1. Argon blowing metal ring pipe, 2. Inlet metal bend pipe, 3. Inlet hose, 4. Air blowing port, 5. Clearance notch, 6. Steel outlet. Detailed Implementation

[0017] This utility model consists of an argon blowing metal ring tube 1, an inlet metal bend tube 2, and an inlet hose 3.

[0018] As shown in the figure, the argon-blowing metal ring pipe 1 is circular and installed at the outer end of the steel outlet 6. The diameter of the argon-blowing metal ring pipe 1 is larger than the diameter of the steel outlet 6. The plane of the argon-blowing metal ring pipe 1 is perpendicular to the axis of the steel outlet 6, and the center of the argon-blowing metal ring pipe 1 coincides with the center of the steel outlet 6. Multiple blowing ports 4 are evenly distributed around the circumference of the argon-blowing metal ring pipe 1, and the blowing ports 4 face the direction of steel tapping. During steel tapping, the blowing ports 4 blow out argon gas to provide an atmosphere protection for the molten steel.

[0019] The diameter of the argon blowing metal ring tube 1 is 35-45mm, and the radius of the argon blowing metal ring tube 1 is 30-50mm larger than the outer diameter of the steel outlet 6. This ensures that the argon gas flow can be evenly distributed around the high-temperature steel flow during the steel tapping process, forming a uniform atmosphere protection.

[0020] As shown in the figure, the lower part of the argon-blowing metal ring pipe 1 has a clearance notch 5. The two ends of the argon-blowing metal ring pipe 1 at the clearance notch 5 are closed, forming a C-shape. The circumferential arc of the clearance notch 5 is 60°. The clearance notch 5 effectively prevents the slag remaining below the tapping port 6 from adhering to the device during the furnace tilting and lifting process, thus effectively protecting the safety of the device.

[0021] The diagram shows that there are six air inlets 4 in the argon-blowing metal ring tube 1, three on each side of the tube. The diameter of the air inlets 4 is 10-20 mm. When argon is blown from the air inlets 4 in the direction of the molten steel flow, the uniformly distributed argon flow around the steel flow can isolate the high-temperature molten steel from the air to the greatest extent, thus preventing the molten steel from absorbing oxygen and nitrogen.

[0022] As shown in the diagram, the upper circumference of the argon blowing metal ring pipe 1 is connected to the inlet metal bend pipe 2, which is a 90-degree bend. The outlet of the inlet metal bend pipe 2 is welded directly above the centerline of the argon blowing metal ring pipe 1. The inlet of the inlet metal bend pipe 2 is connected to the inlet hose 3 by a quick-release connector, facilitating maintenance, disassembly, and connection to various gas sources. The inlet hose 3 is connected to the argon gas delivery pipeline. Argon gas enters the inlet hose 3 through the argon gas delivery pipeline, then enters the inlet metal bend pipe 2, and finally enters the argon blowing metal ring pipe 1 for argon blowing operations.

[0023] The argon-blowing metal ring pipe 1 of this utility model is installed at the front end of the steel tapping port 6. The blowing port 4 of the argon-blowing metal ring pipe 1 faces the direction of steel tapping from the converter. The argon blowing mode is turned on before steel tapping from the converter. When the steel is tapped, argon is blown in the direction of the steel flow into the ladle. Under the Bernoulli effect around the steel flow and the action of blowing argon in the same direction on the outside of the steel flow, an argon protective layer is formed on the outside of the steel flow. This effectively isolates the high-temperature molten steel from contact with oxygen and nitrogen in the air during the tapping process, eliminating the problems of secondary oxidation and nitrogen addition of molten steel.

[0024] An embodiment of this utility model is as follows:

[0025] The diameter of the argon-blowing metal ring tube 1 is 40 mm, the radius of the argon-blowing metal ring tube 1 is 130 mm, and the diameter of the air blowing port 4 is 15 mm.

[0026] The diameter of the intake metal bend 2 is 40mm and the length is 300mm;

[0027] The intake hose 3 has a diameter of 42mm and a length of 500mm.

Claims

1. A steel atmosphere protection device during the tapping process of a converter, characterized in that: It consists of an argon blowing metal ring pipe (1), an inlet metal bend pipe (2), and an inlet hose (3). The argon blowing metal ring pipe (1) is circular and is installed at the outer end of the steel outlet (6). The diameter of the argon blowing metal ring pipe (1) is larger than the diameter of the steel outlet (6). The plane of the argon blowing metal ring pipe (1) is perpendicular to the axis of the steel outlet (6). The center of the argon blowing metal ring pipe (1) coincides with the center of the steel outlet (6). Multiple blowing ports (4) are evenly distributed around the circumference of the argon blowing metal ring pipe (1). The blowing ports (4) face the direction of steel tapping. The upper end of the circumference of the argon blowing metal ring pipe (1) is connected to the outlet end of the inlet metal bend pipe (2). The inlet end of the inlet metal bend pipe (2) is connected to the inlet hose (3). The inlet hose (3) is connected to the argon gas delivery pipeline.

2. The steel atmosphere protection device during the converter tapping process according to claim 1, characterized in that: The lower part of the argon-blowing metal ring tube (1) has a clearance notch (5), and the argon-blowing metal ring tube (1) at both ends of the clearance notch (5) is closed, forming a C-shape, and the circumferential arc of the clearance notch (5) is 60°.

3. The steel atmosphere protection device during the converter tapping process according to claim 1, characterized in that: The diameter of the argon-blowing metal ring tube (1) is 35-45mm, and the radius of the argon-blowing metal ring tube (1) is 30-50mm larger than the steel outlet radius.

4. The steel atmosphere protection device during the converter tapping process according to claim 1, characterized in that: The inlet metal bend (2) is a 90-degree bend. The outlet of the inlet metal bend (2) is welded and connected directly above the center line of the argon blowing metal ring pipe (1). The inlet of the inlet metal bend (2) is connected to the inlet hose (3) by a quick-release connector.

5. The steel atmosphere protection device during the converter tapping process according to claim 1, characterized in that: The argon-blowing metal ring tube (1) has six air inlets (4), three on each side of the argon-blowing metal ring tube (1), and the diameter of the air inlets (4) is 10-20 mm.

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