A new pouring method for large steel ingots

Abstract

The present invention provides a new pouring method for large steel ingots, including determining a pouring mode, constructing a pouring system, setting the height of a center pouring pipe, performing argon replacement and protection operations, and placing protective slag. The pouring system consists of a center pouring pipe, a branch pouring channel, an ingot mold, and a buffer pouring channel. The buffer pouring channel is a cylindrical vertical pouring channel. The height of the center pouring pipe is 800mm higher than the steel liquid level. A protective cover is installed on the top. The inner diameter of the argon hard tube is 10mm, and the argon pressure is maintained at more than 0.2MPa. The protective slag is hung on the edge of the ingot mold before pouring to avoid the central splashing area. The present invention can effectively reduce the splashing of molten steel during the pouring of large steel ingots, improve the purity of the steel ingot, and thus improve the overall quality of the steel ingot.

Description

Technical Field

[0001] The invention relates to the technical field of steel ingot pouring, and more specifically, to a novel pouring method for large steel ingots. Background Art

[0002] Pouring steel ingots places very high demands on the design of the pouring system, especially in the production process of large steel ingots. Traditional pouring systems are usually used for steel ingots with smaller tonnage, which have relatively low impact force of molten steel in the initial stage of pouring. However, for large steel ingots, especially those above 60 tons, the height of the pouring system increases significantly, resulting in an increase in the initial impact force of the molten steel, which causes serious splashing in the early stage of pouring. In addition, as the tonnage of the ingot increases, the pouring time also increases, which makes the requirements for gas protection during atmospheric pouring become higher. In the traditional pouring system, due to the strong impact force and splashing of the molten steel, the protective slag is easily drawn into the molten steel, resulting in secondary oxidation and an increase in inclusions, all of which affect the purity and final quality of the ingot.

[0003] In the process of implementing the embodiments of the present invention, the inventors found that there are at least the following problems or defects in the prior art: when pouring large steel ingots, due to the large impact force of the molten steel, it is difficult for the pouring system to effectively control the flow of the molten steel, which is prone to splashing and affects the purity of the molten steel; at the same time, the existing pouring system is also insufficient in gas protection and cannot provide continuous and stable protection throughout the entire pouring process, thereby increasing the risk of molten steel oxidation and inclusions. Summary of the invention

[0004] The present invention provides a novel pouring method for large-scale steel ingots, comprising the following steps: Step 1: Determine the casting mode, in which each plate corresponds to a cast ingot, and the production of large ingots is carried out according to this mode.

[0005] Step 2: Construct a pouring system, which includes a center pouring pipe, a branch runner, a set of ingot molds and a group of buffer runners. One branch runner is directly connected to the ingot mold, and the other branch runner is connected to the cylindrical vertical runner as a buffer runner to disperse the impact force of the initial steel flow.

[0006] Step 3: Set the height of the center injection pipe to ensure that it is 800mm higher than the molten steel level and the upper end of the center injection pipe funnel brick is more than 800mm higher than the upper end of the riser.

[0007] Step 4: Perform argon replacement and argon protection operations on the pouring system, install a protective cover on the top of the center injection pipe, the inner diameter of the argon hard tube is 10mm, and argon is passed into the protective cover to keep the argon pressure greater than 0.2MPa during pouring; install a phased argon protection device in the ingot mold. This device consists of two argon hard tubes with an inner diameter of 10mm. They are placed at 1 / 2 of the ingot body height and at the lower edge of the riser respectively. As the liquid level in the ingot mold rises, the argon tube is removed when the liquid level is 100mm away from the argon tube, and the argon pressure is greater than 0.2MPa during the entire pouring process.

[0008] Step 5: Before pouring, place the protective slag in the ingot mold at the edge of the ingot mold to avoid the central splashing area. The specific operation is to hang the protective slag in the ingot mold 200mm to 300mm away from the chassis before pouring, so that the protective slag is located at the edge of the ingot mold and is symmetrically distributed in the center.

[0009] Furthermore, the buffer runner is arranged in parallel with the center pouring pipe, the runner is in a vertical state, and its inner diameter is between the inner diameter of the branch runner and the inner diameter of the center pouring pipe.

[0010] Furthermore, when constructing the pouring system, a center pouring pipe with a diameter of 100 mm, a branch pouring channel with a diameter of 70 mm, a set of ingot molds and a set of buffer pouring channels should be used in combination. At the same time, the refractory materials of the pouring system should be kept clean and dry. During the construction process, the pouring pipe and buffer pouring channel bricks should be placed vertically, the brick mouth joints should be tight and no misalignment should occur, and the soup channel bricks should be flush with the tooling and the joints should be tight.

[0011] Furthermore, the buffer runner is built in the same manner as the center pouring pipe, its height is flush with the center pouring pipe, and its inner diameter is between the inner diameters of the branch runner and the center pouring pipe. Available pouring pipe brick models include but are not limited to Ф100 and Ф90.

[0012] Furthermore, 10 minutes before the start of pouring, the pouring system should be thoroughly cleaned and inspected, and argon replacement should be performed. During the argon replacement process, an argon protective cover and an argon hard tube should be used to ensure that the argon pressure is maintained above 0.1MPa.

[0013] Furthermore, there are two branch runners in the pouring system, which are respectively used to connect the steel ingot and the buffer runner to achieve a specific pouring process.

[0014] Furthermore, the argon protective cover is installed on the top of the center pouring pipe to protect the steel flow during pouring and prevent adverse conditions such as oxidation of the molten steel from occurring.

[0015] Furthermore, the two argon hard tubes of the staged argon protection device perform ventilation control in stages according to the change of liquid level during the pouring process.

[0016] Furthermore, the protective slag is hung in the ingot mold at a distance of 200 mm to 300 mm from the bottom plate before pouring, and is evenly distributed on the edge of the ingot mold in a centrally symmetrical state, thereby effectively avoiding the central splashing area.

[0017] Furthermore, the material of each component in the pouring system is refractory material, which has the characteristics of being able to withstand the high temperature of molten steel and will not chemically react with the molten steel during the pouring process, thereby ensuring that the quality of the molten steel is not affected and the quality of the steel ingot is guaranteed.

[0018] The above-mentioned embodiments of the present invention have at least the following beneficial effects: the pouring method provided by the present invention can reduce the problem of initial splashing of molten steel during the pouring of large steel ingots. Through the specific pouring system design, including the combination of the center pouring pipe, the branch pouring channel, the ingot mold and the buffer pouring channel, and the implementation of argon gas replacement and protection measures, the impact force of molten steel on the pouring system can be effectively reduced, and the splashing phenomenon can be reduced. This method helps to reasonably distribute the protective slag and avoid the influence of the central splashing area, thereby reducing the involvement of the protective slag in the molten steel and reducing the risk of secondary oxidation and inclusions.

[0019] In addition, the pouring method of the present invention can also improve the purity and quality of the steel ingot. By maintaining the argon pressure greater than 0.2MPa during the pouring process, the oxidation of the molten steel can be effectively prevented and the generation of inclusions can be reduced. At the same time, the use of the phased argon protection device can perform phased ventilation control according to the change of the liquid level to adapt to the pouring requirements of different stages, ensuring the stability of the entire pouring process and the quality of the molten steel. The comprehensive application of these technical measures can improve the production efficiency and product quality of large steel ingots and meet the strict requirements of the high-end manufacturing field for the quality of large steel ingots. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which: Figure 1 A schematic flow chart of a novel pouring method for large steel ingots provided in one embodiment of the present invention; Figure 2 A comparative schematic diagram of a novel pouring method for large steel ingots provided by one embodiment of the present invention; Figure 3 A schematic structural diagram of a large steel ingot provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive characteristics and / or steps, can be combined in any way, unless otherwise described, and can be replaced by other equivalent or alternative features with similar purposes, that is, unless otherwise described, each feature is only one embodiment in a series of equivalent or similar features.

[0023] like Figure 1 As shown, in some embodiments, a novel pouring method for large steel ingots comprises the following steps: Step 1: Determine the casting mode, in which each plate corresponds to a cast ingot, and the production of large ingots is carried out according to this mode.

[0024] Step 2: Construct a pouring system, which includes a center pouring pipe, a branch runner, a set of ingot molds and a group of buffer runners. One branch runner is directly connected to the ingot mold, and the other branch runner is connected to the cylindrical vertical runner as a buffer runner to disperse the impact force of the initial steel flow.

[0025] Step 3: Set the height of the center injection pipe to ensure that it is 800mm higher than the molten steel level and the upper end of the center injection pipe funnel brick is more than 800mm higher than the upper end of the riser.

[0026] Step 4: Perform argon replacement and argon protection operations on the pouring system, install a protective cover on the top of the center injection pipe, the inner diameter of the argon hard tube is 10mm, and argon is passed into the protective cover to keep the argon pressure greater than 0.2MPa during pouring; install a phased argon protection device in the ingot mold. This device consists of two argon hard tubes with an inner diameter of 10mm. They are placed at 1 / 2 of the ingot body height and at the lower edge of the riser respectively. As the liquid level in the ingot mold rises, the argon tube is removed when the liquid level is 100mm away from the argon tube, and the argon pressure is greater than 0.2MPa during the entire pouring process.

[0027] Step 5: Before pouring, place the protective slag in the ingot mold at the edge of the ingot mold to avoid the central splashing area. The specific operation is to hang the protective slag in the ingot mold 200mm to 300mm away from the chassis before pouring, so that the protective slag is located at the edge of the ingot mold and is symmetrically distributed in the center.

[0028] It should be noted that the present invention relates to a novel pouring method for large steel ingots, which includes determining a pouring mode, that is, a production operation mode in which each flat plate corresponds to a pouring steel ingot. In this mode, the flat plate refers to a platform for carrying molten steel, and the pouring steel ingot refers to a large steel ingot cast by pouring.

[0029] Specifically, when constructing a pouring system, it is necessary to include a center pouring pipe, a branch pouring channel, a set of ingot molds, and a set of buffer pouring channels. The center pouring pipe is the main channel in the pouring system, which is used to guide the molten steel to the ingot mold; the branch pouring channel is a branch extending from the center pouring pipe, which is used to distribute the molten steel to different ingot molds; the ingot mold is a mold that forms the shape of the ingot; the buffer pouring channel is used to disperse the impact force of the initial steel flow and reduce the direct impact on the ingot mold. In this pouring system, one branch pouring channel is directly connected to the ingot mold, and the other branch pouring channel is connected to the cylindrical vertical pouring channel as a buffer pouring channel.

[0030] Preferably, the specific parameters of the pouring system are set as follows: the diameter of the central pouring pipe is 100 mm, the diameter of the branch pouring channel is 70 mm, and the inner diameter of the buffer pouring channel is between the inner diameter of the branch pouring channel and the inner diameter of the central pouring pipe. Such a size setting can ensure the smooth flow of molten steel and effectively disperse the impact force of the steel flow.

[0031] Furthermore, the height of the center pouring pipe should be ensured to be 800mm higher than the molten steel level to maintain an appropriate pressure difference and prevent the molten steel from overflowing. In practical applications, the size of the center pouring pipe and the sub-runner can be appropriately adjusted according to the specific size and weight of the ingot to meet different production requirements.

[0032] In some embodiments, the buffer runner is arranged in parallel with the center pouring tube, the runner is in a vertical state, and its inner diameter is between the inner diameter of the branch runner and the inner diameter of the center pouring tube.

[0033] It should be noted that the buffer runner mentioned in the present invention is arranged in parallel with the center pouring pipe, which means that the buffer runner is kept in the same straight line or plane as the center pouring pipe in terms of structural layout, so that the molten steel can flow smoothly from the buffer runner to the center pouring pipe. The buffer runner here refers to a channel used to slow down the flow speed of the molten steel and disperse the impact force, while the center pouring pipe is the main channel for the molten steel to flow to the ingot mold.

[0034] Specifically, the inner diameter of the buffer runner is between the inner diameter of the branch runner and the inner diameter of the center pouring pipe. This design can ensure that the flow rate and flow rate of the molten steel are properly controlled during the process of flowing from the branch runner to the buffer runner. In the actual pouring system, the diameter of the branch runner is 70mm and the diameter of the center pouring pipe is 100mm. Therefore, the inner diameter of the buffer runner can be designed between 70mm and 100mm, for example, an inner diameter of 80mm or 90mm can be selected to achieve the best control of the flow of molten steel.

[0035] Preferably, the specific masonry method of the buffer runner is the same as that of the center pouring pipe, and its height is flush with the center pouring pipe, so as to ensure the consistency and stability of the entire pouring system. In terms of material selection, the buffer runner can use the same refractory materials as the center pouring pipe, such as high-alumina bricks or corundum bricks. These materials can withstand the high temperature of molten steel without chemical reaction, ensuring the quality of molten steel and the safety of the pouring process.

[0036] Furthermore, during the construction of the buffer pouring channel, the placement of the injection pipe bricks must be kept vertical, and the brick mouth joints should be tight and not misaligned to ensure the sealing and durability of the pouring system. In actual construction, the specific size and shape of the buffer pouring channel can be fine-tuned according to site conditions and pouring requirements to achieve the best pouring effect.

[0037] In some embodiments, when constructing the pouring system, a center pouring pipe with a diameter of 100 mm, a branch pouring channel with a diameter of 70 mm, a set of ingot molds and a set of buffer pouring channels should be used in combination, while ensuring that the refractory materials of the pouring system are clean and dry. During the construction process, the pouring pipe bricks must be placed vertically, the brick mouth joints should be tight and no misalignment should occur, and the soup channel bricks and tooling must be flush and the joints must be tight.

[0038] It should be noted that when the pouring system mentioned in the present invention is built, a center pouring pipe with a diameter of 100 mm, a branch pouring channel with a diameter of 70 mm, a set of ingot molds and a set of buffer pouring channels should be used for combination. The pouring system masonry refers to the process of building a pouring system, including selecting suitable materials and sizes to assemble the pouring system. The center pouring pipe and the branch pouring channel are key components in the pouring system, which are responsible for guiding the flow and distribution of molten steel respectively.

[0039] Specifically, the refractory materials of the pouring system need to be kept clean and dry to ensure the smooth pouring process and the quality of the final steel ingot. During the masonry process, the pouring pipe bricks need to be placed vertically, and the brick mouth joints should be tight and without misalignment, in order to ensure the structural stability and sealing of the pouring system. The soup channel bricks and tooling should be flush and the joints should be tight, so as to prevent the molten steel from leaking or splashing during the pouring process. In actual construction, the selection of pouring pipe bricks and soup channel bricks should be based on their refractory properties and structural strength to adapt to the pouring environment of high-temperature molten steel.

[0040] Preferably, the masonry details of the pouring system can be further refined. For example, the interface between the center pouring pipe and the branch pouring channel can be made of specially designed refractory materials to enhance the stability and sealing of the connection.

[0041] Furthermore, the masonry method of the buffer runner can be the same as that of the center pouring pipe to maintain the consistency of the overall pouring system. In terms of material selection, you can choose Ф100, Ф90 and other types of pouring pipe bricks. These bricks have excellent fire resistance and structural strength, and are suitable for withstanding the high temperature and pressure of molten steel. In actual operation, you can also consider using automated equipment to improve the accuracy and efficiency of masonry to ensure the quality and reliability of the pouring system.

[0042] In some embodiments, the buffer runner is built in the same way as the center pouring pipe, its height is flush with the center pouring pipe, and its inner diameter is between the inner diameter of the branch runner and the inner diameter of the center pouring pipe. The optional pouring pipe brick models include but are not limited to Ф100 and Ф90.

[0043] It should be noted that the construction method of the buffer runner mentioned in the present invention is the same as that of the center pouring pipe, which means that when constructing the pouring system, the construction method and material selection of the buffer runner should be consistent with the center pouring pipe to ensure the coordination and reliability of the entire system. The buffer runner here refers to the channel used to slow down the impact force of the molten steel flow in the pouring system, while the center pouring pipe is the main channel for the molten steel to flow to the ingot mold.

[0044] Specifically, the height of the buffer pouring channel is flush with the center pouring pipe, and the inner diameter is between the inner diameter of the branch pouring channel and the inner diameter of the center pouring pipe. This design can ensure the smooth flow of molten steel in the buffer pouring channel and reduce the impact force on the ingot mold. In actual construction, you can choose Ф100, Ф90 and other types of pouring pipe bricks to build the buffer pouring channel. These bricks have good fire resistance and structural strength and can withstand the impact of high-temperature molten steel. When laying, the pouring pipe bricks should be placed vertically, the brick mouth joints should be tight, and no misalignment should occur to ensure the sealing and stability of the pouring system.

[0045] Preferably, the masonry of the buffer pouring channel can be further refined. For example, specific refractory materials such as high-alumina bricks or corundum bricks can be selected, which not only have excellent fire resistance but also can resist the erosion of molten steel. During the masonry process, special joint materials such as refractory mud can also be used to enhance the sealing of the joints.

[0046] Furthermore, the inner diameter of the buffer pouring channel can be adjusted according to the actual molten steel flow rate and flow rate to achieve optimal flow control. In some cases, prefabricated refractory concrete structures can also be used to replace traditional brick structures to improve construction efficiency and durability of the pouring system.

[0047] In some embodiments, 10 minutes before the start of pouring, the pouring system should be fully cleaned and inspected, and an argon replacement operation should be performed. During the argon replacement process, an argon protective cover and an argon hard tube should be used to ensure that the argon pressure is maintained above 0.1 MPa.

[0048] It should be noted that the pouring system mentioned in the present invention should be thoroughly cleaned and inspected 10 minutes before the start of pouring, and an argon replacement operation should be performed. The comprehensive cleaning and inspection here means that the entire pouring system needs to be thoroughly cleaned before pouring to remove impurities that may affect the quality of the molten steel and the pouring process, and at the same time check whether the system has any defects or damage that may affect the pouring. The argon replacement operation refers to replacing the air in the pouring system with argon to reduce the contact between the molten steel and the air and prevent oxidation.

[0049] Specifically, during the argon replacement process, an argon protective hood and an argon rigid tube should be used to ensure that the argon pressure is maintained above 0.1MPa. The argon protective hood is a device covering the top of the pouring system, which is used to transport argon into the system, while the argon rigid tube is a pipe fixed inside the pouring system, which is used to directly transport argon to the surface of the molten steel. This setting can effectively create a protective atmosphere before pouring, reduce the contact between the molten steel and the air, and thus reduce the risk of oxidation. The argon pressure is maintained above 0.1MPa to ensure that the argon can effectively replace the air in the system and continue to provide protection during the pouring process.

[0050] Preferably, the specific parameters and operation steps of the argon replacement operation can be further refined. For example, the flow rate of the argon gas can be adjusted according to the volume and shape of the pouring system to ensure that the replacement is completed within 10 minutes.

[0051] Furthermore, an automated control system can be used to precisely control the flow rate and pressure of argon to ensure consistency and reliability of the displacement operation. In some cases, local argon protection can also be used, that is, argon is delivered only in specific areas of the casting system to reduce argon consumption and improve efficiency.

[0052] Furthermore, a leak test can be performed after the argon replacement is completed to ensure that the casting system is well sealed and there is no argon leakage, thereby ensuring the gas protection effect during the casting process.

[0053] In some embodiments, there are two sub-runners in the pouring system, which are respectively used to connect the steel ingot and the buffer runner to achieve a specific pouring process.

[0054] It should be noted that the number of branch runners in the pouring system mentioned in the present invention is two, which means that in the structural design of the pouring system, there will be two channels branched from the central pouring pipe, which are used for different pouring purposes. The branch runners are channels in the pouring system used to distribute molten steel from the main runner to each ingot mold, and they are crucial to controlling the flow and distribution of molten steel.

[0055] Specifically, the two branch runners are used to connect the steel ingot and the buffer runner respectively to achieve a specific pouring process. One branch runner is directly connected to the ingot mold and is responsible for guiding the molten steel into the ingot mold; the other branch runner is connected to the cylindrical vertical runner as a buffer runner to disperse the impact force of the initial steel flow and reduce the direct impact on the ingot mold. This design can ensure the smooth flow of molten steel during the pouring process and reduce the risk of splashing and oxidation. The size and shape of the branch runner can be adjusted according to the flow rate and flow rate of the molten steel to meet different pouring requirements.

[0056] Preferably, the specific design and operation steps of the runner can be further refined. For example, the inner diameter of the runner can be optimized according to the flow rate and flow velocity of the molten steel to ensure that the molten steel can flow into the ingot mold evenly and smoothly. In practical applications, the length and angle of the runner can be adjusted according to the size and weight of the ingot to achieve the best distribution of the molten steel.

[0057] Furthermore, the material of the sub-casting channel can be selected from refractory materials with good fire resistance and corrosion resistance, such as high-alumina bricks or corundum bricks, to withstand the impact of high-temperature molten steel. In some cases, prefabricated refractory concrete structures can also be used to replace traditional brick structures to improve construction efficiency and the durability of the casting system. In addition, a regulating device, such as a sliding gate or valve, can be set at the outlet of the sub-casting channel to accurately control the flow and flow rate of the molten steel.

[0058] In some embodiments, the argon protective cover is installed on the top of the center pouring pipe to protect the steel flow during pouring and prevent adverse conditions such as oxidation of the molten steel.

[0059] It should be noted that the argon protective cover mentioned in the present invention is installed on the top of the center pouring pipe, and its function is to protect the steel flow during pouring and prevent the molten steel from being oxidized and other adverse conditions. The argon protective cover is a device covering the top of the center pouring pipe, which is used to transport argon to the surface of the molten steel to form a protective atmosphere, reduce the contact between the molten steel and the air, and thus reduce the risk of oxidation and other harmful reactions.

[0060] Specifically, the argon shield ensures that the steel flow is not affected by oxidation during pouring, which is achieved by passing argon into the shield. Argon is an inert gas that does not easily react chemically with other elements, so using argon during the pouring process can effectively protect the molten steel from oxidation. The design of the shield needs to take into account the flow rate of the molten steel and the pouring speed to ensure that it can provide adequate protection throughout the pouring process. The flow rate and pressure of the argon gas need to be precisely set according to the size of the pouring system and the properties of the molten steel to maintain a stable protective atmosphere.

[0061] Preferably, the design and operation steps of the argon protective cover can be further refined. For example, the shape and size of the protective cover can be customized according to the needs of different pouring systems to ensure the best protection effect. In some cases, the protective cover can be designed to be detachable or adjustable to accommodate different sizes of center pouring tubes or different pouring conditions.

[0062] Furthermore, the argon delivery system can include a flow meter and a pressure regulator to accurately control the flow and pressure of argon to ensure that the required protective atmosphere is maintained throughout the pouring process. As an alternative, local argon protection can also be used, that is, argon protection is provided only in key areas where the molten steel contacts the air to reduce argon consumption and improve efficiency.

[0063] In some embodiments, the two argon hard tubes of the phased argon protection device are ventilated in stages according to the change of liquid level during the pouring process to meet the pouring requirements of different stages.

[0064] It should be noted that the two argon hard pipes of the phased argon protection device mentioned in the present invention perform ventilation control in stages according to the change of liquid level during the pouring process, which means that the function of the argon hard pipe is to adjust the supply of argon according to the different height stages of the molten steel level during the pouring process to meet the pouring requirements of different stages. The phased argon protection device is a protection device used in a pouring system, which prevents oxidation of molten steel by controlling the supply of argon.

[0065] Specifically, the phased argon protection device includes two argon rigid tubes, which are placed at 1 / 2 of the ingot height and at the lower edge of the riser respectively. The location of the two rigid tubes is based on the dynamic changes of the rising steel liquid level during the pouring process to ensure that argon protection can be effectively provided at different stages. In the early stage of pouring, the two argon rigid tubes are ventilated at the same time to quickly establish a protective atmosphere; as the liquid level gradually stabilizes, the number of argon rigid tubes is reduced to only one argon rigid tube; in the later riser stage, the argon protection can be removed due to the reduced pouring speed and stable liquid level. During the entire pouring process, the argon pressure must be greater than 0.2MPa to maintain an effective protective atmosphere.

[0066] Preferably, the operation steps of the phased argon protection device can be further refined. For example, a sensor can be set to monitor the liquid level and linked with the argon supply system to automatically control the supply of argon. This ensures that when the liquid level changes, the argon supply can be adjusted in time to maintain the best protection effect.

[0067] Furthermore, the material of the argon rigid tube can be selected from high temperature resistant and corrosion resistant materials, such as stainless steel or special alloys, to ensure stability and durability in high temperature environments. As an alternative, flexible argon tubes can be considered, which can be appropriately adjusted according to the changes in the liquid level to adapt to ingot molds of different shapes and sizes.

[0068] In some embodiments, the protective slag is hung in the ingot mold at a distance of 200 mm to 300 mm from the bottom plate before pouring, and is evenly distributed on the edge of the ingot mold in a centrally symmetrical state, thereby effectively avoiding the central splashing area.

[0069] It should be noted that the protective slag mentioned in the present invention is hung in the ingot mold at a distance of 200mm to 300mm from the chassis before pouring, and is evenly distributed on the edge of the ingot mold in a centrally symmetrical state. The protective slag here refers to a material used to protect the molten steel from oxidation and contamination during the pouring process, usually made of refractory materials, and can remain stable at high temperatures. The ingot mold is a mold used to form the shape of the steel ingot, and the chassis refers to the bottom part of the ingot mold.

[0070] Specifically, the hanging position and distribution of the protective slag is to avoid the central splashing area, reduce the contact between the molten steel and the air, and thus reduce the risk of oxidation. In actual operation, the protective slag is usually evenly hung on the edge of the ingot mold at a height range of 200mm to 300mm from the chassis, so that a protective layer can be formed to prevent the molten steel from directly contacting the air. The distribution of the protective slag needs to maintain central symmetry to ensure that the molten steel in the entire ingot mold can be evenly protected.

[0071] Preferably, the suspension and distribution of the protective slag can be further refined. For example, the protective slag can be suspended using special suspension devices that can be fixed to the edge of the ingot mold to ensure that the protective slag does not shift during the pouring process. The thickness and shape of the protective slag can also be customized according to the size and shape of the ingot mold to ensure the best protection effect.

[0072] Furthermore, the physical and chemical indicators of the mold slag are: Chemical composition: R: 0.28~0.48%, SiO2: 31~41%, CaO: 10~18%, Al2O3: ≤13%, MgO: ≤7%, Fe2O3: ≤7%, C: 13.5~21.5%, H2O: ≤0.8%.

[0073] Physical indicators: Melting point: 1080~1180, particle size: 80~100 mesh.

[0074] In some embodiments, the material of each component in the pouring system is refractory material, which has the characteristics of being able to withstand the high temperature of molten steel and will not chemically react with the molten steel during the pouring process, thereby ensuring that the quality of the molten steel is not affected and the quality of the steel ingot is guaranteed.

[0075] It should be noted that the materials of the components in the pouring system mentioned in the present invention are refractory materials, which are materials that can remain stable at high temperatures and do not chemically react with molten steel. These materials are crucial to ensure that the quality of molten steel is not affected and to guarantee the quality of steel ingots.

[0076] Specifically, the components in the pouring system, including the center pouring pipe, branch pouring channel, ingot mold and buffer pouring channel, should be made of refractory materials that can withstand the high temperature of molten steel. These materials need to have good thermal shock resistance and chemical stability to ensure that they will not be damaged by high temperature during the pouring process, and will not react with the molten steel to affect the purity of the molten steel. Common refractory materials include high-alumina bricks, corundum bricks, magnesia bricks, etc. Their specific parameters such as refractoriness, compressive strength and thermal expansion coefficient need to be selected and set according to the actual pouring conditions and the characteristics of the molten steel.

[0077] Preferably, the refractory material selection and construction process of each component in the pouring system can be further refined. For example, refractory materials with specific chemical compositions can be selected according to the temperature and chemical composition of the molten steel to ensure optimal temperature resistance and chemical corrosion resistance. During the construction process, the masonry of refractory materials should be carried out strictly in accordance with the design requirements to ensure the stability and sealing of the masonry structure.

[0078] Furthermore, prefabricated refractory modules can also be used to simplify the construction process and improve construction efficiency. As an alternative, cast refractory materials such as refractory concrete or castables can also be considered, which can be cast into specific shapes and sizes as needed to adapt to the design requirements of the casting system.

[0079] Example 1 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Branch pouring channel: diameter 70mm; Ingot mold: one set; Buffer runner: one set, inner diameter 90mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0080] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 70 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 90 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0081] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0082] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0083] Example 2 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Branch pouring channel: diameter 70mm; Ingot mold: one set; Buffer runner: one set, inner diameter 100mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0084] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 70 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 100 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0085] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0086] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0087] Example 3 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Spout: diameter 60mm; Ingot mold: one set; Buffer runner: one set, inner diameter 90mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0088] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 60 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 90 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0089] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0090] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0091] Example 4 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Spout: diameter 60mm; Ingot mold: one set; Buffer runner: one set, inner diameter 100mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0092] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 60 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 100 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0093] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0094] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0095] Example 5 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter 90mm; Branch pouring channel: diameter 70mm; Ingot mold: one set; Buffer runner: one set, inner diameter 90mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0096] S6. Use a center pouring pipe with a diameter of 90 mm, a branch runner with a diameter of 70 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 90 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0097] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0098] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0099] Example 6 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter 90mm; Spout: diameter 60mm; Ingot mold: one set; Buffer runner: one set, inner diameter 90mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0100] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 60 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 90 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0101] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0102] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0103] Example 7 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Branch pouring channel: diameter 70mm; Ingot mold: one set; Buffer runner: one set, inner diameter 80mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0104] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 70 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 80 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0105] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0106] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0107] Example 8 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter is 100mm; Spout: diameter 60mm; Ingot mold: one set; Buffer runner: one set, inner diameter 80mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0108] S6. Use a center pouring pipe with a diameter of 100 mm, a branch runner with a diameter of 60 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 80 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0109] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0110] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0111] Example 9 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter 90mm; Branch pouring channel: diameter 70mm; Ingot mold: one set; Buffer runner: one set, inner diameter 80mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0112] S6. Use a center pouring pipe with a diameter of 90 mm, a branch runner with a diameter of 70 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 80 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0113] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0114] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0115] Example 10 A novel pouring method for large steel ingots, comprising the following components and steps: Middle injection pipe: diameter 90mm; Spout: diameter 60mm; Ingot mold: one set; Buffer runner: one set, inner diameter 80mm. The pouring method of this embodiment comprises the following steps: S1. Determine the pouring mode, and cast a steel ingot for each flat plate; S2. Construct a pouring system, including a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel; S3. Set the height of the center injection pipe to ensure that it is 800mm above the steel liquid level; S4. Hang protective slag on the edge of the ingot mold to avoid the central splashing area. S5. Ensure that the buffer runner is set parallel to the center injection pipe and the runner is in a vertical position.

[0116] S6. Use a center pouring pipe with a diameter of 90 mm, a branch runner with a diameter of 60 mm, a set of ingot molds and a set of buffer runners with an inner diameter of 80 mm. S7. Install an argon protection cover on the top of the center pouring pipe in the pouring system, and install a phased argon protection device in the ingot mold.

[0117] Synthesis method: Follow the above steps S1 to S7. Reaction conditions: The height of the center injection pipe is set to be 800mm above the steel liquid level. Purity: Through spectral analysis, the non-metallic inclusion content in the steel ingot is lower than the industry standard. Uses and effects: This casting method is suitable for the production of large steel ingots above 60 tons. It can effectively reduce the initial splashing of molten steel and improve the purity and quality of the steel ingots.

[0118] Experiments show that the steel ingot cast using this method exhibits better mechanical properties and surface quality in subsequent processing.

[0119] Comparative Example 1 like Figure 2 This comparative example is a simulation result of a traditional pouring system at different pouring speeds, and the simulation conditions are as follows: Injection speed: 3.0t / min; Casting system: traditional casting system, without buffer runner.

[0120] The display of the above simulation results includes the following steps: (a) The parameters of the conventional pouring system were set to a pouring rate of 3.0 t / min to simulate the flow of molten steel; (b) Observe and record the flow and splashing of molten steel during the pouring process.

[0121] Comparative Example 2 This comparative example is a simulation result of a traditional pouring system at different pouring speeds, and the simulation conditions are as follows: Injection speed: 4.0t / min; Casting system: traditional casting system, without buffer runner.

[0122] The display of the above simulation results includes the following steps: (a) The parameters of the conventional pouring system were set to a pouring rate of 4.0 t / min to simulate the flow of molten steel; (b) Observe and record the flow and splashing of molten steel during the pouring process.

[0123] Comparative Example 3 This comparative example is a simulation result of a traditional pouring system at different pouring speeds, and the simulation conditions are as follows: Injection speed: 5.0t / min; Casting system: traditional casting system, without buffer runner.

[0124] The display of the above simulation results includes the following steps: (a) The parameters of the conventional pouring system were set to a pouring rate of 5.0 t / min to simulate the flow of molten steel; (b) Observe and record the flow and splashing of molten steel during the pouring process.

[0125] Experimental example This experimental example is a simulation result of a new pouring method for large ingots at different pouring speeds. The simulation conditions are as follows: Injection speed: 3.0t / min, 4.0t / min, 5.0t / min; Pouring system: The pouring system of the present invention comprises a center pouring pipe, a branch pouring channel, an ingot mold and a buffer pouring channel.

[0126] The display of the above simulation results includes the following steps: (a) The parameters of the pouring system of the present invention were set to pouring rates of 3.0 t / min, 4.0 t / min, and 5.0 t / min, and the flow simulation of molten steel was performed respectively; (b) Observe and record the flow and splashing of molten steel during the pouring process.

[0127]

[0128]

[0129]

[0130] It can be seen from Tables 1 to 3 that the simulation results of the technical solution of the present invention and the traditional pouring system at different pouring speeds show that the pouring system of the present invention can maintain a good flow state of molten steel at each pouring speed, and the splashing situation is significantly better than that of the traditional pouring system. Especially at a higher pouring speed, the pouring system of the present invention can still maintain the stability of the flow of molten steel and reduce splashing, showing the superiority of the present invention in the pouring process of large ingots.

[0131] At different pouring speeds, the pouring system of the present invention generates a relatively low splash height during the pouring process, which indicates that the pouring system of the present invention can effectively reduce the oxidation of the molten steel during the pouring process, thereby improving the purity of the steel ingot. By optimizing the design of the pouring system, the present invention reduces the contact between the molten steel and the air, further reducing the occurrence of adverse conditions.

[0132] In addition, the pouring system of the present invention also performs well in terms of stability, which means that the maintenance of the system can be reduced and the production efficiency is improved. These advantages make the pouring system of the present invention have obvious application value in the production of large steel ingots, especially in improving the quality of steel ingots and production efficiency. By reducing production interruptions, the pouring system of the present invention helps to improve the overall production process and economic benefits.

[0133] like Figure 3 As shown, a large ingot pouring system according to an embodiment of the present invention includes a towering center pouring pipe, located in the middle of a flat plate, responsible for guiding molten steel from a ladle into an ingot mold and a buffer runner, and slowing down the flow rate of molten steel in the ingot mold through a semicircular buffer zone at the end of a branch runner at its bottom, thereby reducing the impact on the ingot mold; an ingot mold with a regular 16-sided wave shape inside and a regular 16-sided polygonal shape outside, located on the left side of the center pouring pipe, used to accommodate and shape the ingot; a buffer runner, located on the right side of the center pouring pipe, used to reduce the splashing of molten steel during the pouring of large ingots; the ingot mold, the center pouring pipe, and the buffer runner are firmly mounted on a flat plate, and a groove is provided in the middle area of ​​the flat plate; the groove of the flat plate is used for the construction of the branch runner, connecting the center pouring pipe and the ingot mold and the buffer runner, and is responsible for distributing molten steel. An argon protective cover can be installed on the top of the center pouring pipe, and an argon hard pipe can be installed inside the ingot mold to provide argon protection during the pouring process to prevent oxidation of the molten steel. In addition, the ladle that provides molten steel also contains valves and connectors for controlling the flow of molten steel and connecting the argon protective cover of the center injection pipe.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0135] The above descriptions are only some preferred embodiments of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present invention is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present invention.

Claims

1. A new pouring method for large steel ingots, characterized in that: The following steps are involved: Step 1: Determine the casting mode, in which each plate corresponds to a cast ingot, and the production of large ingots is carried out according to this mode. Step 2: Construct a pouring system, which includes a center pouring pipe, a branch runner, a set of ingot molds and a group of buffer runners. One branch runner is directly connected to the ingot mold, and the other branch runner is connected to the cylindrical vertical runner as a buffer runner to disperse the impact force of the initial steel flow. Step 3: Set the height of the center injection pipe to ensure that it is 800mm higher than the molten steel level and the upper end of the center injection pipe funnel brick is more than 800mm higher than the upper end of the riser. Step 4: Perform argon replacement and argon protection operations on the pouring system, install a protective cover on the top of the center injection pipe, and pass argon into the protective cover to keep the argon pressure greater than 0.2MPa during pouring; install a phased argon protection device in the ingot mold. This device consists of two argon hard tubes with an inner diameter of 10mm. They are placed at 1 / 2 of the ingot body height and at the lower edge of the riser respectively. As the liquid level in the ingot mold rises, the argon tube is removed when the liquid level is 100mm away from the argon tube, and the argon pressure is greater than 0.2MPa during the entire pouring process. Step 5: Before pouring, place the protective slag in the ingot mold at the edge of the ingot mold to avoid the central splashing area. The specific operation is to hang the protective slag in the ingot mold 200mm to 300mm away from the chassis before pouring, so that the protective slag is located at the edge of the ingot mold and is symmetrically distributed in the center.

2. A new pouring method for large steel ingots according to claim 1, characterized in that: The buffer runner is arranged in parallel with the center pouring pipe, the runner is in a vertical state, and its inner diameter is between the inner diameter of the branch runner and the inner diameter of the center pouring pipe.

3. A new pouring method for large steel ingots according to claim 1, characterized in that: When constructing the pouring system, a center pouring pipe with a diameter of 100mm, a branch pouring channel with a diameter of 70mm, a set of ingot molds and a set of buffer pouring channels should be used in combination. At the same time, the refractory materials of the pouring system should be ensured to be clean and dry. During the construction process, the pouring pipe and buffer pouring channel bricks should be placed vertically, the brick mouth joints should be tight and no misalignment should occur, and the soup channel bricks should be flush with the tooling and the joints should be tight.

4. A new pouring method for large steel ingots according to claim 1, characterized in that: The buffer pouring channel is built in the same manner as the center pouring pipe, its height is flush with the center pouring pipe, and its inner diameter is between the inner diameter of the branch pouring channel and the inner diameter of the center pouring pipe. The available pouring pipe brick models include Ф100 and Ф90.

5. A novel pouring method for large steel ingots according to claim 1, characterized in that: 10 minutes before pouring, the pouring system should be thoroughly cleaned and inspected, and argon replacement should be performed. During the argon replacement process, an argon protective cover and argon hard tube should be used to ensure that the argon pressure is maintained above 0.1MPa.

6. A novel pouring method for large steel ingots according to claim 1, characterized in that: There are two branch runners in the pouring system, which are respectively used to connect the steel ingot and the buffer runner to realize a specific pouring process.

7. A new pouring method for large steel ingots according to claim 1, characterized in that: The argon protective cover is installed on the top of the center pouring pipe, and plays a role in protecting the steel flow during pouring, preventing the occurrence of adverse conditions such as oxidation of molten steel.

8. A new pouring method for large steel ingots according to claim 1, characterized in that: The two argon hard tubes of the phased argon protection device perform ventilation control in stages according to the change of liquid level during the pouring process.

9. A novel pouring method for large steel ingots according to claim 1, characterized in that: The protective slag is hung in the ingot mold at a distance of 200 mm to 300 mm from the bottom plate before pouring, and is evenly distributed on the edge of the ingot mold in a centrally symmetrical state, thereby effectively avoiding the central splashing area.

10. A novel pouring method for large steel ingots according to claim 1, characterized in that: The material of each component in the pouring system is refractory material, which has the characteristics of being able to withstand the high temperature of molten steel and will not chemically react with the molten steel during the pouring process, thereby ensuring that the quality of the molten steel is not affected and the quality of the steel ingot is guaranteed.

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