A nanocrystalline master alloy runner and pouring equipment

Abstract

The present invention relates to the field of metallurgical technology, and discloses a nanocrystalline master alloy runner and pouring equipment. The nanocrystalline master alloy runner includes: an outer shell, a refractory filling layer, and a glass lining; wherein the outer shell is located at the outermost layer of the nanocrystalline master alloy runner; and the glass lining is located in the inner cavity of the refractory filling layer. Since the glass lining is provided in the inner cavity of the refractory filling layer, the surface of the glass material is relatively smooth, which can increase the flow rate of the molten steel, and the glass has low thermal conductivity and good thermal stability at high temperatures, which can reduce oxidation and temperature drop, and is not easy to react with the molten steel and contaminate the molten steel; after the steel is poured, the glass material will form cracks when it cools, which makes it easy to clean the surface of the runner body. The cleaned glass residue and residual steel can be returned to the furnace for remelting. After the glass is melted, protective slag can be formed, and the molten steel yield is high. Therefore, this nanocrystalline master alloy runner greatly reduces the wear of the runner body and increases the service life of the runner.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgy, in particular to a nanocrystalline master alloy runner and pouring equipment. Background Art

[0002] Traditional nanocrystalline alloy melts have high viscosity and poor fluidity due to the large amount of Nb element they contain.

[0003] In the existing technology, when manufacturing wide nanocrystalline ultra-thin strips, it is inevitable to use a runner to transport molten steel. In order to improve the fluidity of the melt, the only way is to significantly increase the temperature of the molten steel or add metal elements such as Si, B, and P. However, this will accelerate the erosion and wear of the refractory materials in the runner. After repeated use, the runner is prone to cracking, peeling, and corrosion products, which directly affects the cleanliness of the molten steel.

[0004] Therefore, how to improve the damage resistance of the runner has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0005] The object of the present invention is to provide a nanocrystalline master alloy runner and pouring equipment, wherein the nanocrystalline master alloy runner can greatly reduce the wear of the runner refractory material and increase the service life of the runner.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A nanocrystalline master alloy runner comprises an outer shell, a refractory filling layer and a glass lining; wherein the outer shell is located at the outermost layer of the nanocrystalline master alloy runner; the glass lining is located in the inner cavity of the refractory filling layer, and the inner cavity of the glass lining constitutes the runner body, which is used to circulate molten steel.

[0008] This nanocrystalline master alloy runner features a glass lining within the inner cavity of the refractory filling layer. The glass's smooth surface and non-wetting properties increase the flow rate of the molten steel. Glass also exhibits excellent thermal stability at high temperatures and a low thermal conductivity, reducing oxidation and temperature drop, making it less likely to react with and contaminate the molten steel. After pouring, the glass cools and undergoes a crystal transformation, forming cracks. This facilitates cleaning the runner's surface, allowing the cleaned glass and steel residue to be returned to the furnace for remelting. Once melted, the glass forms protective slag, resulting in a high steel yield. After each pour, the runner only needs to be cleaned. A new glass lining is then fixed with a small amount of plastic material before pouring again. This significantly reduces wear on the runner and extends its service life.

[0009] Optionally, the material of the refractory filling layer includes nano-carbon fibers.

[0010] Optionally, the refractory material filling layer includes a graphite lining; the outer side of the graphite lining has a layer of spherical porous carbon.

[0011] Optionally, the nanocrystalline master alloy runner further includes an electromagnetic heating layer; the electromagnetic heating layer is used for inductively heating the graphite lining to increase the temperature of the runner body.

[0012] Optionally, the nanocrystalline master alloy runner further includes a thermal insulation layer; the thermal insulation layer is located between the outer shell and the refractory material filling layer.

[0013] Optionally, the glass-lined inner cavity is provided with a filter screen; the filter screen is used to filter impurities in the molten steel.

[0014] Optionally, the filter screen plate is installed at the steel outlet of the runner body.

[0015] Optionally, the filter screen plate is made of foam ceramic.

[0016] A casting device comprises a ladle car, a ladle, a bracket, a drive device and any one of the above-mentioned nanocrystalline master alloy runners; the ladle is mounted on the ladle car via the bracket; the drive device is used to drive the ladle to move so as to switch the ladle between an initial position and a casting position; when the ladle is at the initial position, the extension direction of the ladle is parallel to the horizontal direction; when the ladle is at the casting position, the extension direction of the ladle forms an angle with the horizontal direction, and the position of the ladle's outlet corresponds to the position of the outlet of the nanocrystalline master alloy runner.

[0017] Optionally, when the ladle is at the pouring station, the ladle can rotate around its own axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0019] Figure 1 A schematic cross-sectional view of a nanocrystalline master alloy runner provided in an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the relationship between the electromagnetic heating layer and the graphite lining in the nanocrystalline master alloy runner provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the pouring equipment provided by an embodiment of the present invention when the ladle is in the initial position;

[0022] Figure 4 This is a schematic diagram of the pouring equipment provided in an embodiment of the present invention when the ladle is at the pouring station.

[0023] Icons: 1-shell; 2-refractory filling layer; 3-glass lining; 4-insulation layer; 5-filter plate; 6-carriage; 7-ladle; 8-bracket; 9-hydraulic drive rod; 10-rotating shaft; 11-sprue body; 12-electromagnetic heating layer; 13-electromagnetic induction coil; 14-graphite lining; 15-graphite insulation layer. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0025] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Figure 1 A schematic cross-sectional view of a nanocrystalline master alloy runner provided in an embodiment of the present invention is shown in FIG. Figure 1 As shown, an embodiment of the present invention provides a nanocrystalline master alloy runner, comprising: an outer shell 1, a refractory material filling layer 2 and a glass lining 3; wherein, the outer shell 1 is located at the outermost layer of the nanocrystalline master alloy runner; the glass lining 3 is located in the inner cavity of the refractory material filling layer 2, and the inner cavity of the glass lining 3 constitutes a runner body 11, which is used to circulate molten steel.

[0027] In this embodiment, since a glass lining 3 is provided in the inner cavity of the refractory material filling layer 2, the surface of the glass material is relatively smooth and does not wet with the molten steel, which can increase the flow rate of the molten steel. In addition, the glass has good thermal stability at high temperatures and a low thermal conductivity coefficient, which can reduce oxidation and temperature drop, and is not easy to react with the molten steel and contaminate the molten steel. After the steel is poured, the glass material undergoes a crystal transformation when it cools, thereby forming cracks, which makes it easy to clean the surface of the runner body. The cleaned glass residue and residual steel can be returned to the furnace for remelting. After the glass is melted, protective slag can be formed, and the molten steel yield is high. After each pouring is completed, the runner is cleaned. It is only necessary to clean the glass lining 3 and use a small amount of plastic material to fix the new glass lining 3 before pouring again. This greatly reduces the wear of the runner body 11 and increases the service life of the runner.

[0028] Among them, the material of the shell 1 can be heat-resistant stainless steel, and its thickness range is 10mm-15mm; the thickness range of the refractory filling layer 2 is 30mm-50mm; the material of the glass lining 3 can be silicate glass, preferably, quartz glass, and its thickness range is 3mm-5mm.

[0029] In addition, the refractory filling layer 2 may specifically include: SiO2 (accounting for about 92.3%), CaO (accounting for about 2.8%), Na2O and K2O (accounting for about 0.4%), Al2O3 (accounting for about 1.2%), Fe2O3 (accounting for about 1.1%), MgO (accounting for about 1.1%), and P2O5 (accounting for about 1%).

[0030] In addition, if Figure 1 As shown, the side of the glass lining 3 used for circulating molten steel can be a curved surface. The setting of the curved surface is more conducive to the circulation of molten steel, avoiding splashing of molten steel when pouring steel, and also easier to clean up the residue when the glass material forms cracks due to cooling.

[0031] As an optional embodiment, the material of the refractory material filling layer 2 includes nano-carbon fibers.

[0032] In this embodiment, the nano-carbon fibers have strong toughness and good thermal conductivity, which can make the nano-crystalline master alloy runner reach the thermal equilibrium temperature more easily.

[0033] Specifically, since the runner frequently alternates between hot and cold during use, it requires excellent thermal shock resistance, high thermal conductivity, and low expansion coefficient to improve heat diffusion capacity, alleviate thermal stress concentration, and avoid delamination, cracking, and thermal damage and spalling of the refractory body. Nanocarbon fiber has a tensile strength of more than 7GPa, a thermal conductivity of more than 400W / (m·K), and a thermal expansion coefficient of only (0.5~0.5)×10 -6 / °C, highly adaptable to the environment. In this embodiment, the refractory filling layer 2 includes nanocarbon fibers, which are used in a ratio of 1 to 2 wt% in the refractory material. The nanocarbon fibers have a diameter of 15nm-25nm and a length between 100μm and 1000μm. The ultra-high aspect ratio enables the nanocrystalline carbon fibers to form a high-strength composite skeleton, greatly improving the strength and toughness of the refractory material itself. In particular, its excellent thermal conductivity and low expansion coefficient make the thermal shock resistance of the refractory filling layer 2 more prominent.

[0034] As an optional embodiment, the refractory material filling layer 2 includes a graphite lining; the outer side of the graphite lining has a layer of spherical porous carbon.

[0035] Preferably, the graphite can be 98 high purity graphite.

[0036] In this embodiment, since the porous carbon is a porous highly elastic body, it can absorb the expansion caused by the difference in thermal expansion coefficients between the graphite lining and the runner through deformation during high temperature changes, thereby preventing delamination or cracks in the runner.

[0037] Specifically, the particle size of the spherical porous carbon is in the range of 5 μm-10 μm, and the specific surface area is in the range of 2000 m 2 / g-2500m 2 / g, the thickness used in refractory materials is 1mm-3mm. The ultra-large specific surface area formed by the micro-nano pores makes the porous carbon have super stress-strain capacity. During the induction heating process, the graphite lining has the ability to heat up quickly and has an extremely low expansion rate, which does not match the heating rate and expansion coefficient of the refractory filling layer, and it is easy to cause stratification.

[0038] As an optional embodiment, the nanocrystalline master alloy runner further includes an electromagnetic heating layer; the electromagnetic heating layer is used for inductively heating the graphite lining to increase the temperature of the runner body 11 .

[0039] In this embodiment, the provision of an electromagnetic heating layer can rapidly heat the graphite lining. The induction heating method can heat the graphite heating layer to 1000 degrees within 30 seconds, thereby significantly improving heating efficiency and heating stability. Before pouring steel, the electromagnetic induction heating device is turned on to achieve rapid heating of the graphite lining through electromagnetic induction. The graphite lining preheats the adjacent refractory material before pouring steel through radiation and conduction. Since the graphite heating speed exceeds 100 degrees, the runner can be preheated to the designed runner pouring temperature in a very short time. Compared with the conventional method of preheating the runner before pouring steel by gas combustion baking, the preheating method of this embodiment saves time and effort, heats evenly, and can protect the runner body. Moreover, when the molten steel circulates in the runner during the steel pouring process, the induction heating device can simultaneously induction heat the molten steel flowing through the runner in real time, so that the molten steel is always maintained at the set temperature and does not solidify due to excessive heat dissipation in the air, thereby achieving low-temperature pouring of highly clean molten steel.

[0040] Specifically, the electromagnetic heating layer may include an electromagnetic induction coil, which should be arranged outside the graphite lining to heat the graphite lining through electromagnetic induction between the two. The thickness of the electromagnetic induction coil may range from 3mm to 5mm.

[0041] Figure 2 Schematic diagram of the relationship between the electromagnetic heating layer and the graphite lining in the nanocrystalline master alloy runner provided in the embodiment of the present invention, refer to Figure 2 When the electromagnetic heating layer 12 includes the electromagnetic induction coil 13 , the electromagnetic induction coil 13 may be disposed outside the graphite liner 14 ;

[0042] A graphite insulation layer 15 may be added between the electromagnetic heating layer 12 and the graphite lining 14 to further prevent the temperature of the graphite lining 14 from being lost after being heated, thereby more effectively ensuring the heating efficiency.

[0043] In addition, a temperature measuring port for temperature measurement, such as an infrared temperature measuring port, can be provided to measure the temperature of the molten steel flowing between the steel outlet of the ladle 7 and the steel outlet of the runner body 11 in real time, thereby realizing real-time monitoring of the temperature of the molten steel circulating in the runner body; an induction coil adjustment unit, a temperature measuring component and a PID control unit can also be provided, the induction coil adjustment unit can realize temperature adjustment by adjusting the electromagnetic induction coil; the temperature measuring component can measure the temperature of the molten steel through the temperature measuring port; the PID control unit is signal-connected to the induction coil adjustment unit and the temperature measuring component, thereby realizing automatic temperature adjustment compensation and maintaining the stability of the temperature of the molten steel flowing between the steel outlet of the ladle 7 and the steel outlet of the runner body 11.

[0044] refer to Figure 1 As an optional embodiment, the nanocrystalline master alloy runner further includes a thermal insulation layer 4 ; the thermal insulation layer 4 is located between the outer shell 1 and the refractory material filling layer 2 .

[0045] The insulation layer 4 can be made of aluminum silicate fiber with a thickness ranging from 10mm to 15mm; the insulation layer 4 can also be made of asbestos cloth with a thickness ranging from 10mm to 20mm. In this embodiment, the provision of the insulation layer 4 can slow down the loss of heat in the pouring channel, thereby further ensuring the efficiency of pouring and the quality of the product.

[0046] Continue to refer Figure 1 As an optional embodiment, the inner cavity of the glass lining 3 is provided with a filter screen 5; the filter screen 5 is used to filter impurities in the molten steel.

[0047] In this embodiment, the filter plate 5 can filter out impurities in the molten steel, thereby ensuring the purity of the molten steel and the quality of the final product.

[0048] As an optional embodiment, the filter screen 5 is made of foam ceramic. In this embodiment, foam ceramic is a porous material with high temperature properties and is very suitable for use in the casting process to filter impurities in the molten steel, further improving the quality of the product.

[0049] Specifically, the filter screen plate 5 can be made of foam ceramics such as mullite, zirconium oxide, silicon nitride, and silicon carbide, preferably zirconium oxide foam ceramic filter screen. Depending on the nanocrystalline composition, the pore size of the foam ceramic can be 10ppi-50ppi, for example, it can be any one of 10ppi, 12ppi, 14ppi, 16ppi, 18ppi, 22ppi, 25ppi, 28ppi, 32ppi, 34ppi, 36ppi, 43ppi, 45ppi, 47ppi, and 50ppi. It can also be any pore size between two adjacent pores mentioned above, depending on actual needs, and is not specifically limited.

[0050] As an optional embodiment, the filter screen plate 5 is installed at the steel outlet of the runner body.

[0051] In this embodiment, the filter screen plate 5 is installed at the steel outlet of the runner body. If there are impurities in the runner body, the molten steel will be filtered through the filter screen plate before flowing into the ingot mold, thereby effectively reducing the occurrence of impurities in the runner body flowing into the next process with the molten steel, further ensuring the purity of the molten steel, and thus improving the quality of the product.

[0052] In addition, the installation of the filter screen plate 5 at the steel outlet of the runner body is more convenient than the installation at the middle of the runner body.

[0053] Figure 3 A schematic diagram of the pouring equipment provided by an embodiment of the present invention when the ladle is in the initial position; Figure 4 Schematic diagram of the pouring equipment provided in an embodiment of the present invention when the ladle is in the pouring station; Figure 3 and Figure 4 As shown, an embodiment of the present invention further provides a casting equipment, including a ladle 6, a ladle 7, a bracket 8, a driving device and any one of the above-mentioned nanocrystalline master alloy runners; the ladle 7 is installed on the ladle 6 through the bracket 8; the driving device is used to drive the ladle 7 to move so that the ladle 7 can switch between the initial position and the casting position; when the ladle 7 is in the initial position, the extension direction of the ladle 7 is parallel to the horizontal direction; when the ladle 7 is in the casting position, the extension direction of the ladle 7 forms an angle with the horizontal direction, and the steel outlet position of the ladle 7 corresponds to the steel outlet position of the nanocrystalline master alloy runner.

[0054] Among them, it is easy to understand that the ladle 6 may have a roller 12, and the pouring equipment may also include a servo motor, which is used to drive the roller to rotate, thereby realizing the movement of the position of the ladle 6 to facilitate the steel outlet of the ladle 7 to align with the pouring outlet of the runner.

[0055] In this embodiment, the driving device may include a hydraulic driving rod 9, and the bracket 8 may be connected to the ladle 7 through a rotating shaft 10. When the position of the ladle 7 needs to be adjusted, the hydraulic driving rod 9 drives one end of the ladle 7 to move upward or downward in the vertical direction. Under the action of the rotating shaft 10, the other end of the ladle 7 will also make an opposite movement in the vertical direction, thereby realizing the switching of the ladle 7 between the initial position and the pouring position.

[0056] It should be noted that this embodiment only illustrates a way in which the ladle 7 can switch between the initial station and the pouring station. The specific form of the driving device is not limited, and it is sufficient to ensure that the ladle 7 can switch between the initial station and the pouring station.

[0057] As an optional embodiment, when the ladle 7 is at the pouring station, the ladle 7 can rotate around its own axis.

[0058] In this embodiment, the ladle 7 may include a rotating shaft 10 with the same extension direction as itself. The rotating shaft 10 is driven by a driving motor to drive the ladle 7 to rotate as a whole, thereby realizing pouring while rotating and improving the pouring efficiency; in addition, an angular velocity sensor connected to the driving motor signal may be provided to control the rotational angular velocity of the ladle 7 in real time, thereby further achieving high-quality pouring.

[0059] Similarly, it should be noted that this embodiment only illustrates a method of realizing rotary casting of the ladle 7 by using the rotating shaft 10. The specific rotation form of the ladle 7 is not limited, and it is sufficient to realize casting while rotating.

[0060] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nanocrystalline master alloy runner, characterized in that: include: outer shell, refractory filling layer and glass lining; wherein, The shell is located at the outermost layer of the nanocrystalline master alloy runner; The glass lining is located in the inner cavity of the refractory material filling layer, and the inner cavity of the glass lining constitutes a runner body, and the runner body is used for circulating molten steel; After the steel is poured, the glass lining of the glass material will undergo a crystal transformation when it cools, thereby forming cracks. After the cracked glass lining is cleaned, a small amount of plastic material is used to fix a new glass lining before pouring the steel again. The thickness of the outer shell is in the range of 10mm-15mm, the thickness of the refractory filling layer is in the range of 30mm-50mm, and the thickness of the glass lining is in the range of 3mm-5mm; The side of the glass lining used for circulating molten steel is a curved surface; The material of the refractory material filling layer includes nano-carbon fibers; The refractory filling layer includes a graphite lining; The outer side of the graphite liner is provided with a layer of spherical porous carbon.

2. The nanocrystalline master alloy runner according to claim 1, characterized in that: The nanocrystalline master alloy runner also includes an electromagnetic heating layer; The electromagnetic heating layer is used for inductively heating the graphite lining to increase the temperature of the runner body.

3. The nanocrystalline master alloy runner according to claim 1, characterized in that: The nanocrystalline master alloy runner also includes a thermal insulation layer; The heat-insulating layer is located between the outer shell and the refractory material filling layer.

4. The nanocrystalline master alloy runner according to any one of claims 1 to 3, characterized in that: The inner cavity of the glass lining is provided with a filter screen plate; The filter screen is used to filter impurities in the molten steel.

5. The nanocrystalline master alloy runner according to claim 4, characterized in that: The filter screen plate is installed at the steel outlet of the runner body.

6. The nanocrystalline master alloy runner according to claim 4, characterized in that: The filter screen plate is made of foam ceramic.

7. A pouring device, characterized in that: It comprises a ladle, a ladle, a support, a driving device and the nanocrystalline master alloy runner according to any one of claims 1 to 6; The ladle is mounted on the ladle vehicle via the bracket; The driving device is used to drive the ladle to move so as to switch the ladle between the initial station and the pouring station; When the ladle is in the initial position, the extension direction of the ladle is parallel to the horizontal direction; When the ladle is at the pouring station, the extension direction of the ladle forms an angle with the horizontal direction, and the steel outlet position of the ladle corresponds to the pouring port position of the nanocrystalline master alloy runner.

8. The pouring equipment according to claim 7, characterized in that When the ladle is at the pouring station, the ladle can rotate around its own axis.

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