CN115900352B - Medium frequency induction furnace building mold and furnace building method thereof - Google Patents
Medium frequency induction furnace building mold and furnace building method thereof Download PDFInfo
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- CN115900352B CN115900352B CN202211599562.3A CN202211599562A CN115900352B CN 115900352 B CN115900352 B CN 115900352B CN 202211599562 A CN202211599562 A CN 202211599562A CN 115900352 B CN115900352 B CN 115900352B
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a furnace building mould and a furnace building method for an intermediate frequency induction furnace; the intermediate frequency induction furnace building mold comprises a cylinder body, wherein the cylinder body is provided with a cavity with an opening structure on the upper surface and the lower surface and a side wall with a certain thickness; the base is arranged in the cavity at the lower end of the cylinder body, and a gap is reserved between the outer wall surface of the base and the inner surface of the side wall of the cylinder body. According to the invention, the barrel body and the base of the furnace building die of the medium-frequency induction furnace are arranged in a split mode, so that the barrel body can be pulled out of the crucible of the medium-frequency induction furnace after the temperature rising and baking process is finished, and then the high-temperature sintering process is carried out, and the barrel body can be reused; the furnace construction method is simple and convenient, has short flow, can control the time of the furnace shutdown, furnace disassembly, furnace construction, furnace baking, sintering, furnace washing and restarting the belt manufacturing process to be completed within 15 hours, greatly improves the production rhythm and obviously reduces the production cost.
Description
Technical Field
The invention belongs to the field of intermediate frequency induction furnace building, and particularly relates to an intermediate frequency induction furnace building die and a furnace building method thereof.
Background
In the production process of the nanocrystalline strip, molten steel is smelted by adopting an intermediate frequency induction furnace, molten steel sedation and production rhythm buffering are carried out by adopting an induction tundish, and the crucible used by the furnace body is an electrolytic fused quartz crucible. The quartz crucible is subjected to direct scouring of high-temperature molten steel, slag erosion and repeated quenching and rapid heating in the long-term service process, so that the furnace lining is easily damaged and the furnace needs to be built again. Taking a 2 ton induction tundish as an example, the primary furnace construction cost needs 2 ten thousand yuan, and the belt production cycle from furnace shutdown, furnace disassembly, furnace construction, furnace baking, sintering, furnace washing and restarting needs 3 days, so that the production rhythm is seriously affected by abnormal furnace construction, and the production cost is greatly increased. The furnace construction mode and sintering quality of the quartz crucible are key to influencing the service life of the crucible.
At present, an induction furnace for nanocrystalline smelting is generally sintered by knotting a furnace lining by a dry method and sintering materials, and a crucible is also required to be cleaned by a furnace cleaning material before actual production. The general furnace construction structure is an integrated carbon structural steel (Q235) mold consisting of a vertical cylindrical mold wall and a circular mold bottom. After the furnace is built, the furnace casting carbon structural steel mould cannot be disassembled, the furnace building mould is melted along with the furnace in the subsequent sintering process, the mould cannot be reused, molten steel can be polluted after the furnace is melted, the high-purity materials used for production are used as furnace washing materials for cleaning the whole furnace body after the sintering is completed, and the sintering materials and the furnace washing materials cannot be used for normal production. The whole process time of furnace shutdown, furnace disassembly, furnace construction, furnace baking, sintering, furnace washing and restarting for belt manufacturing exceeds 50 hours, and the furnace baking time is long, the energy consumption is high and the cost is high.
Disclosure of Invention
Aiming at the defects and the shortcomings existing in the prior art, the invention aims to provide a furnace building die of an intermediate frequency induction furnace and a furnace building method thereof; according to the invention, the barrel body and the base of the furnace building die of the medium-frequency induction furnace are arranged in a split mode, so that the barrel body can be pulled out of the crucible of the medium-frequency induction furnace after the temperature rising and baking process is finished, and then the high-temperature sintering process is carried out, and the barrel body can be reused; through further adopting heat-resisting stainless steel barrel and pure iron base, heat-resisting stainless steel heat dispersion is relatively poor and than the carbon element structural steel of equal volume ratio has higher induction heating efficiency and makes it can contact better with the sintering material, and then makes the sintering layer more compact, and the barrel sets up to radial size from top to down the round platform form that reduces gradually, be favorable to obtaining from top to down thickness and density sintering layer that increases gradually, thereby reduce the adverse effect that the high-speed rotation of nanocrystalline master alloy melting initial molten steel at every turn first erodes the furnace lining bottom under electromagnetic stirring, and then increase the life of furnace lining. According to the invention, the furnace building mold is applied to the furnace building method, the sintering material calculated in advance is added in the heating and baking process, and the pure iron base is counted into the total amount of qualified nanocrystalline master alloy, so that molten steel obtained after the high-temperature sintering process is finished can be directly used for manufacturing the belt.
The invention provides a furnace building die of an intermediate frequency induction furnace, which adopts the following technical scheme:
a furnace building die of an intermediate frequency induction furnace, comprising: the cylinder body is provided with a cavity with an opening structure on the upper surface and the lower surface and a side wall with a certain thickness;
the base is arranged in the cavity at the lower end of the cylinder body, and a gap is reserved between the outer wall surface of the base and the inner surface of the side wall of the cylinder body.
Compared with a carbon structure steel mold formed by integrally forming a cylinder body and a base in the prior art, in the furnace building process, the furnace building mold is melted along with a furnace in a subsequent high-temperature sintering process, the furnace building mold cannot be reused, and the carbon structure steel mold is seriously out of standard and contains other impurity elements so as to pollute molten steel after being melted, so that a furnace washing process (adopting high-purity materials as furnace washing materials to wash the whole furnace body) is required after the high-temperature sintering process, and the furnace building mold pollution of the sintering materials and the furnace washing materials due to the melted carbon structure steel cannot be used for normal production of nanocrystalline strips, so that the energy consumption is large and the production cost is high; the intermediate frequency induction furnace building mold comprises a barrel and a base which are arranged in a split mode, and after the heating and baking process is finished, the barrel of the furnace building mold is pulled out of a crucible of the intermediate frequency induction furnace and then subjected to the high-temperature sintering process, so that the barrel of the furnace building mold can be reused; in addition, the sintering material (namely the pure iron base, the sintering material and the nanocrystalline master alloy with the total back component of normal production) which is calculated in advance and is counted in the total quantity of the qualified nanocrystalline master alloy is added in the heating and baking process, so that molten steel obtained after the high-temperature sintering process is finished can be directly used for manufacturing belts.
In the above intermediate frequency induction furnace building mold, as a preferred embodiment, the outer surface of the side wall of the cylinder is coated with a release agent along the circumferential direction thereof; preferably, the coating thickness of the release agent is more than or equal to 1mm, preferably 2-3mm (such as 2.1mm, 2.2mm, 2.5mm, 2.7mm, 2.9 mm);
preferably, the release agent comprises, in mass percent: 90% -96% (such as 91%, 92%, 93%, 94%, 95%) of boron nitride, 3% -5% (such as 3.2%, 3.4%, 3.5%, 3.7%, 3.9%) of boron oxide, 1% -5% (such as 1.5%, 2%, 3%, 4%, 4.5%) of silicon nitride;
preferably, the boron nitride is in the form of a sheet, with dimensions of 100-300 μm (e.g. 120 μm, 150 μm, 200 μm, 250 μm, 280 μm) and a thickness of 50-80 μm (e.g. 55 μm, 60 μm, 65 μm, 70 μm, 75 μm);
preferably, the boron oxide is irregularly flaky, with dimensions of 30-60 μm (such as 35 μm, 40 μm, 45 μm, 50 μm, 55 μm) and thickness of 10-30 μm (such as 12 μm, 15 μm, 20 μm, 25 μm, 29 μm);
preferably, the silicon nitride is spherical or spheroid-like particles with a D50 particle size of 60-150nm (e.g., 70nm, 80nm, 90nm, 100nm, 120nm, 140 nm).
The release agent is an interface coating used on the outer surfaces of two objects which are easy to adhere to each other, and can lead the outer surfaces of the objects to be easy to separate, smooth and clean; by further limiting the coating thickness of the release agent, the direct contact between the cylinder body of the furnace building die and the crucible can be avoided, and the release effect is further improved.
The release agent takes the flaky boron nitride as a matrix material, has good high-temperature stability and lubricity, is limited to be 100-300 mu m in size and 50-80 mu m in thickness, and can easily slide under the action of tensile stress, so that the release agent has better release effect; the boron oxide is limited to be in an irregular flake shape, the size is 30-60 mu m, the thickness is 10-30 mu m, the boron oxide within the range has an ultrathin thickness, the high-temperature inertia of a release agent can be improved, and the bonding force between the boron nitride substrate materials can be enhanced by embedding the ultrathin boron oxide into flake-shaped boron nitride and blending and sintering the ultrathin boron oxide with the flake-shaped boron nitride, so that the phenomena of powder falling and flaking are avoided; the silicon nitride is limited to spherical or spheroidal particles with the D50 particle size of 60-150nm, wherein the spherical or spheroidal silicon nitride with small particle size can be sintered at low temperature so as to further promote the sintering between the flaky boron nitride and the irregular flaky boron oxide, promote the binding force between matrix materials of the release agent, and the spherical or spheroidal silicon nitride with large particle size can promote the sliding movement between the flaky boron nitride, thereby greatly reducing the release difficulty.
In the above intermediate frequency induction furnace building mold, as a preferred embodiment, the radial dimension of the cavity of the cylinder body is gradually reduced from top to bottom to form a truncated cone shape;
preferably, the side wall of the cylinder body is equal in wall thickness and the cylinder body is in a truncated cone shape; more preferably, the sidewall wall thickness of the cartridge is 7-10mm (e.g., 7.5mm, 8mm, 8.5mm, 9mm, 9.5 mm);
preferably, the angle between the waist line of the longitudinal section of the cylinder and the central axis is 5 ° -10 ° (such as 6 °, 7 °, 8 °, 9 °, 9.5 °).
According to the invention, the barrel is arranged in a truncated cone shape, the side wall of the barrel is of equal wall thickness, and the radial dimension of the cavity of the barrel is gradually reduced from top to bottom, so that the friction between the outer surface of the side wall of the barrel and the inner wall of the crucible of the intermediate frequency induction furnace in the drawing process of the subsequent barrel is reduced, and the barrel of the furnace building die is smoothly separated from the crucible of the intermediate frequency induction furnace after the heating and baking process is finished; in addition, the cylinder body is arranged into a round table shape with the radial dimension gradually reduced from top to bottom, so that ramming materials with gradually increased thickness from top to bottom are formed in the furnace lining ramming process, and then a sintered layer with gradually increased thickness and density from top to bottom is formed after a subsequent furnace lining baking process and a high-temperature sintering process, and the adverse effect caused by that molten steel firstly erodes the bottom end of the furnace lining due to high-speed rotation of the molten steel in the initial stage of melting the nanocrystalline master alloy under electromagnetic stirring is reduced, and the service life of the furnace lining is prolonged. The wall thickness of the side wall of the cylinder is limited to 7-10mm, so that the cylinder can bear the compressive stress from ramming mass in the heating and baking process, and the rigidity of the cylinder in the whole process is ensured without deformation.
In the above intermediate frequency induction furnace building mold, as a preferred embodiment, the material of the cylinder is stainless steel, preferably one of SUS301S, SUS309S, SUS310S, SUS 314;
preferably, the base is made of pure iron;
preferably, the base is a solid cylinder, and the thickness of the base is 2-3mm (such as 2.1mm, 2.2mm, 2.5mm, 2.7mm, 2.8 mm);
preferably, a gap between the outer wall surface of the base and the inner surface of the side wall of the cylinder is 3-5mm, and plastic materials are filled in the gap;
preferably, the plastic material comprises, in mass percent: 67% -68% (such as 67.2%, 67.3%, 67.5%, 67.7%, 67.9%) of alumina, 25% -28% (such as 25.5%, 26%, 26.5%, 27%, 27.5%) of silica, 2% -3% (such as 2.2%, 2.4%, 2.5%, 2.8%, 2.9%) of phosphorus pentoxide, and the balance unavoidable impurities.
The invention limits the material of the cylinder to be stainless steel, preferably one of SUS301S, SUS309S, SUS310S, SUS314, because the above-mentioned several materials are heat-resistant stainless steel, can be used for a long time under 1200 ℃, and have good heat-resistant stability; compared with the carbon structural steel base of the furnace building mold in the prior art, which is at least 10mm thick, the solid cylinder pure iron base of the invention does not generate thermal deformation (sintering materials are added in the high-temperature sintering stage in the prior art, namely, the cavity of the furnace building mold in the heating and baking stage is hollow, if the thickness of the base is insufficient, deformation and warping occur after heating, so that the crucible bottom sintering is uneven, and the service life of the crucible is influenced, therefore, the carbon structural steel base in the prior art is at least 10mm thick), the solid cylinder pure iron base of the invention can sinter the bottom wall of the crucible of the medium-frequency induction furnace under the ballast of the first nanocrystalline master alloy without deformation, and can be melted along with the furnace in the subsequent high-temperature sintering process. Because the mass ratio of Fe element in the final molten steel exceeds 80%, the pure iron base can be calculated in advance to count the total amount of nanocrystalline master alloy so as to accurately control the components of the final molten steel, and the purity and the production sequence of the final molten steel are not affected.
In addition, the plastic material of the invention selects phosphoric acid as a binding agent, and aluminum oxide-based refractory materials, and the plastic material is often used as a furnace collar sealing, furnace mouth building material and repairing material, and is characterized by plasticity, namely disassembly and use, good construction performance, and the like of plasticine, can be made into various shapes, and has good thermal shock resistance, abrasion resistance and erosion resistance.
The second aspect of the invention provides a furnace building method for building a furnace mold by using the medium frequency induction furnace, comprising the following steps:
s1, firstly filling ramming materials in the bottom wall of a crucible of an intermediate frequency induction furnace, performing a furnace bottom ramming process, then placing a barrel of a furnace building mold in the crucible of the intermediate frequency induction furnace, and then filling ramming materials in a gap between the inner wall of the crucible of the intermediate frequency induction furnace and the side wall of the barrel of the furnace building mold, and performing a furnace lining ramming process;
s2, after the furnace lining ramming process is finished, placing a base of a furnace building die in the intermediate frequency induction furnace crucible and coaxial with a cylinder of the furnace building die, adding a first nanocrystalline master alloy (sintered material) into a cavity of the cylinder of the furnace building die, and carrying out a heating and baking process;
and S3, after the heating and baking process is finished, pulling out the cylinder body of the furnace building die from the intermediate frequency induction furnace crucible, performing a high-temperature sintering process, and then cooling to obtain molten steel and the intermediate frequency induction furnace crucible with a sintering furnace lining.
In the prior art, a furnace building mold of carbon structural steel integrally formed by a cylinder body and a base is used for carrying out a heating and baking process, after the heating and baking process is finished, industrial 1K101 master alloy is added as a sintering material to carry out a high-temperature sintering process, the furnace building mold and the sintering material are melted together, molten steel is poured out after the high-temperature sintering process, then high-purity material is added for furnace washing, then the molten steel is poured out, and finally nanocrystalline master alloy is added for production, wherein the cylinder body of the furnace building mold is pulled out from a crucible of an intermediate-frequency induction furnace after the heating and baking process is finished, so that the cylinder body can be reused; in addition, the sintering material which is calculated in advance and the total amount of the qualified nanocrystalline master alloy is calculated by the pure iron base is added in the heating and baking process, so that molten steel obtained after the high-temperature sintering process is finished can be used for normal production, sintering of the sintering material and cleaning of a furnace lining are realized while the heating and baking process is carried out, the cost of 2 nanocrystalline master alloy can be saved in each furnace building. The ramming mass is a refractory material which is commonly used in the field and is used as a raw material of a crucible of an intermediate frequency induction furnace.
In the above furnace construction method, as a preferred embodiment, the intermediate frequency induction furnace crucible is a quartz crucible.
In the above furnace construction method, in step S1, the furnace bottom ramming step and the lining ramming step are both dry knotting.
In the above furnace construction method, in the heating and baking step S2, the temperature is raised from room temperature to 1050 to 1100 ℃ (e.g., 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃, 1095 ℃) at a heating rate of 250 to 350 ℃/h, and the temperature is kept for 3 to 5 hours (e.g., 3.2 hours, 3.5 hours, 3.8 hours, 4 hours, 4.5 hours).
In the above furnace construction method, in step S2, the volume of the first nanocrystalline master alloy is 70% -80% (such as 72%, 74%, 75%, 77%, 79%) of the volume of the cavity of the cylinder; preferably, the first nanocrystalline master alloy is in a shape of a truncated cone, and the radial dimension of the first nanocrystalline master alloy is gradually reduced from top to bottom and is matched with the cavity of the cylinder; preferably, the first nanocrystalline master alloy is an iron-based nanocrystalline alloy; the iron-based nanocrystalline alloy includes, in mass percent, 8.5% -9.0% (e.g., 8.55%, 8.6%, 8.7%, 8.8%, 8.9%) of Si, 1.55% -1.6% (e.g., 1.56%, 1.57%, 1.58%, 1.59%, 1.595%), 5.5% -6.0% (e.g., 5.6%, 5.7%, 5.8%, 5.9%, 5.95%), 1.25% -1.3% (e.g., 1.26%, 1.27%, 1.28%, 1.29%, 1.295%) of B, and the balance of Fe.
The heating and baking process of the invention heats the furnace building mold through electromagnetic induction, and then the furnace building mold bakes the ramming material through heat conduction and heat radiation, thereby removing free moisture and gas in the ramming material to enable the ramming material to shrink and compact, the density and strength are further improved, and the baking is carried out at 1050-1100 ℃ because the first nanocrystalline master alloy and the furnace building mold cannot be melted at the temperature; the first nanocrystalline master alloy, namely the iron-based nanocrystalline alloy, is added, so that the coreless induction heating is changed into cored induction heating in the baking process, the heating efficiency is greatly improved, and the baking time is shortened. The first nanocrystalline master alloy is further limited to be in a round table shape, the radial size of the first nanocrystalline master alloy is gradually reduced from top to bottom, and the first nanocrystalline master alloy is matched with the cavity of the cylinder body, so that the first nanocrystalline master alloy can be used as a heating body to be matched with the inner wall of the crucible of the medium frequency induction furnace and uniformly radiate heat to the crucible, and the baking effect is improved.
In the above furnace construction method, as a preferred embodiment, in step S3, the high-temperature sintering process includes: firstly, performing a first-stage high-temperature sintering treatment to enable the first nanocrystalline master alloy to be completely melted, and then continuously adding the second nanocrystalline master alloy until the second nanocrystalline master alloy is completely melted; then continuously heating to perform second-stage high-temperature sintering treatment; then continuously heating to perform third-stage high-temperature sintering treatment;
preferably, in the first-stage high-temperature sintering treatment, the temperature is raised by the full power of the medium-frequency induction furnace; preferably, the addition amount of the second nanocrystalline master alloy is that the highest liquid level of molten steel formed by the first nanocrystalline master alloy and the second nanocrystalline master alloy after the first nanocrystalline master alloy and the second nanocrystalline master alloy are completely melted is equal to the furnace mouth of the intermediate frequency induction furnace crucible; preferably, the second nanocrystalline master alloy is the same chemical composition as the first nanocrystalline master alloy.
According to the invention, the volume of the first nanocrystalline master alloy is 70% -80% of the volume of the cavity of the cylinder, the first-stage high-temperature sintering treatment can be performed to completely melt the alloy, the molten steel liquid level of the crucible of the medium-frequency induction furnace during normal steel storage can be reached after the alloy is melted, the inner wall of the crucible with the longest service time is sintered to form a sintered layer, and then the second nanocrystalline master alloy is added to enable the highest liquid level of molten steel formed after the first nanocrystalline master alloy and the second nanocrystalline master alloy are melted to be level with the furnace mouth of the crucible, so that the induction heating efficiency can be greatly improved, and the bottom surface and the inner surface of the whole crucible are uniformly sintered. According to the invention, the first nanocrystalline master alloy and the second nanocrystalline master alloy are used as sintering materials and added pure iron bases calculated in advance to form nanocrystalline master alloy raw materials, and molten steel with standard components obtained after melting can be directly used for producing nanocrystalline strips.
In the furnace construction method, as a preferred embodiment, the temperature of the second-stage high-temperature sintering treatment is 1620-1650 ℃ (such as 1625 ℃, 1630 ℃, 1635 ℃, 1640 ℃, 1645 ℃), and the heat preservation time is 0.5-1.5h (such as 0.6h, 0.7h, 0.8h, 1.0h, 1.2 h); preferably, the temperature is raised to 1620-1650 ℃ at full power of the medium frequency induction furnace.
In the furnace construction method, as a preferred embodiment, the temperature of the third-stage high-temperature sintering treatment is 1680-1720 ℃ (for example 1685 ℃, 1690 ℃, 1695 ℃, 1700 ℃, 1710 ℃), and the holding time is 7-15min (for example 8min, 9min, 10min, 12min, 14 min); preferably, the temperature is raised to 1680-1720 ℃ at the full power of the medium frequency induction furnace.
The invention forms a high temperature resistant and molten steel erosion resistant sintered layer on the bottom surface and the inner surface of a crucible through a high temperature sintering process, and finally forms a sintered layer, a semi-sintered layer and a loose layer from inside to outside through the first stage, the second stage and the third stage high temperature sintering process, wherein the loose layer is formed by ramming materials which are not subjected to high temperature sintering process, the semi-sintered layer is formed by outwards radiating the sintered layer in the high temperature sintering process at 1620-1650 ℃, and the sintered layer is further strengthened to obtain a stable sintered layer under the high temperature sintering process at 1680-1720 ℃ and the thickness of the middle semi-sintered layer is increased; in the subsequent production process, after the sintering layer is corroded and damaged by molten steel, the semi-sintering layer is gradually changed into the sintering layer through high-temperature molten steel sintering, part of loose layer is changed into the semi-sintering layer, the thickness of the loose layer is reduced to 0.5 cm, the risk of steel penetration exists, a furnace needs to be built again, and the loose layer can prevent steel penetration accidents caused by molten steel penetrating through the semi-sintering layer when a crucible is cracked; in addition, through the second-stage high-temperature sintering treatment and the third-stage high-temperature sintering treatment, the silicon dioxide can be subjected to crystal transformation, so that the alpha quartz crystal is changed into alpha phosphoquartz, and the erosion-resistant enamel sintered layer with high-temperature stability is obtained.
In the above furnace construction method, as a preferred embodiment, in the heating and baking step and the high-temperature sintering step, a furnace cover with temperature measurement and argon protection is provided on the crucible of the intermediate frequency induction furnace for temperature monitoring, and the furnace cover is connected with a PLC temperature control module of the intermediate frequency induction furnace.
According to the invention, the temperature monitoring is performed by arranging the furnace cover with temperature measurement and argon protection on the crucible of the intermediate frequency induction furnace, so that the temperature and time are strictly controlled in the heating and baking process and the high-temperature sintering process, and the density and sintering quality of the sintered layer are further ensured.
The third aspect of the invention provides a medium frequency induction furnace obtained by the furnace construction method, which is applied to the production of nanocrystalline strips.
Compared with the prior art, the invention has the following advantages:
(1) The barrel of the intermediate frequency induction furnace building die can be smoothly and rapidly pulled out of the intermediate frequency induction furnace crucible after the temperature rising and baking are finished, the barrel can be repeatedly used, and the sintering material which is calculated in advance and is used for counting the total amount of qualified nanocrystalline master alloy into the pure iron base is added in the temperature rising and baking process, so that molten steel obtained after the high-temperature sintering process is finished can be used for normal production.
(2) The intermediate frequency induction furnace building mold adopts the heat-resistant stainless steel cylinder body and the pure iron base, so that the sintering layer is more compact, the cylinder body is in a round table shape with the radial dimension gradually reduced from top to bottom, and the sintering layer with gradually increased thickness and density from top to bottom is beneficial to be obtained, thereby reducing the adverse effect caused by that the molten steel firstly erodes the bottom end of the furnace lining when the molten steel is rotated at high speed under electromagnetic stirring in the initial stage of melting the nanocrystalline master alloy every time, and further prolonging the service life of the furnace lining.
(3) The furnace construction method is simple and convenient, has short flow, can control the time of the furnace shutdown, furnace disassembly, furnace construction, furnace baking, sintering, furnace washing and restarting belt manufacturing process to be completed within 15 hours, and improves the furnace construction efficiency.
Drawings
FIG. 1 is a schematic view of a furnace construction mold according to the present invention;
reference numerals illustrate: 1. a cylinder; 11. a cavity; 12. a sidewall; 2. a base; 3. plastic material; 4. a first nanocrystalline master alloy; 5. intermediate frequency induction furnace crucible.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled," "connected," and "configured" as used herein are to be construed broadly and may be, for example, fixedly connected or detachably connected; can be directly connected or indirectly connected through an intermediate component; either a wired electrical connection, a radio connection or a wireless communication signal connection, the specific meaning of which terms will be understood by those of ordinary skill in the art as the case may be.
The examples of the present invention are implemented on the premise of the technical scheme of the present invention, and detailed implementation modes and processes are given, but the protection scope of the present invention is not limited to the following examples, in which the process parameters of specific conditions are not noted, and generally according to conventional conditions.
The endpoints of the ranges and any values disclosed in the present invention are not limited to the precise range or value, and the range or value should be understood to include values close to the range or value. For numerical ranges, one or more new numerical ranges may be obtained in combination with each other between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point values, and are to be considered as specifically disclosed in the present invention.
In the present invention, all values relating to the amounts of the components are "parts by weight" throughout unless specified and/or indicated otherwise. The process parameters for the specific conditions not noted in the examples below are generally as usual. The furnace construction method of the invention is suitable for ramming materials and shaping materials known in the art, wherein in order to facilitate comparison of furnace construction effects in each embodiment, the ramming materials are silicon oxide-based dry vibration refractory materials of combined mineral (Tianjin) limited company, and the marks are as follows: DRI-462S, comprising in weight percent: 99.2% of silicon oxide, 0.5% of aluminum oxide, 0.1% of ferric oxide and the balance of unavoidable impurities; the granularity is less than or equal to 4.75mm; the plastic material used in the embodiment of the invention comprises the following components in percentage by weight: 67.3% of alumina, 25.7% of silicon oxide, 2.8% of phosphorus pentoxide and the balance of unavoidable impurities. The starting materials described in the remaining examples are all available from published commercial sources.
The invention provides a furnace building mold of an intermediate frequency induction furnace and a furnace building method using the furnace building mold of the intermediate frequency induction furnace; referring to fig. 1, the intermediate frequency induction furnace building mold of the present invention includes: the device comprises a barrel 1 and a base 2, wherein the barrel 1 is provided with a cavity 11 with an opening structure on the upper surface and the lower surface and a side wall 12 with a certain thickness; the radial dimension of the cavity 11 is gradually reduced from top to bottom to form a truncated cone shape; the side wall 12 has equal wall thickness, the cylinder body 1 is in a round table shape, and the outer surface of the side wall 12 is coated with a release agent along the circumferential direction; the base 2 is a solid cylinder, is arranged in the lower end cavity 11 of the cylinder 1, and is provided with a gap between the outer wall surface of the base 2 and the inner surface of the side wall 12 of the cylinder 1, plastic material 3 is filled in the gap, the cylinder 1 is made of stainless steel, and the base 2 is made of pure iron.
Further, the wall thickness of the side wall 12 of the cylinder body 1 is 7-10mm;
further, the included angle between the waist line of the longitudinal section of the cylinder body 1 and the central axis is 5-10 degrees;
further, the material of the cylinder 1 is one of SUS301S, SUS309S, SUS310S, SUS 314;
further, the thickness of the base is 2-3mm;
further, the coating thickness of the release agent is more than or equal to 1mm, preferably 2-3mm;
further, the release agent comprises, in mass percent: 90% -96% of boron nitride, 3% -5% of boron oxide and 1% -5% of silicon nitride; wherein the boron nitride is flaky, the size is 100-300 mu m, and the thickness is 50-80 mu m; the boron oxide is in an irregular sheet shape, the size is 30-60 mu m, and the thickness is 10-30 mu m; the silicon nitride is spherical or spheroidic particles, and the D50 particle size is 60-150nm;
further, the gap between the outer wall surface of the base 2 and the inner surface of the side wall 12 of the cylinder 1 is 3-5mm;
further, the plastic material comprises the following components in percentage by mass: 67-68% of aluminum oxide, 25-28% of silicon dioxide, 2-3% of phosphorus pentoxide and the balance of unavoidable impurities.
A furnace building method for building a furnace mold by using the medium frequency induction furnace comprises the following steps:
s1, firstly filling ramming materials in the bottom wall of a middle frequency induction furnace crucible 5 and performing a furnace bottom ramming process, then placing a barrel 1 of a furnace building mold in the middle frequency induction furnace crucible 5, and then filling ramming materials in a gap between the inner wall of the middle frequency induction furnace crucible 5 and the side wall 12 of the barrel 1 and performing a furnace lining ramming process, wherein the furnace bottom ramming process and the furnace lining ramming process are dry knotting;
s2, after the furnace lining ramming process is finished, adding a base 2 into a cavity 11 of a barrel 1 of a furnace building die, adding a first nanocrystalline master alloy 4 with 70% -80% of the volume of the cavity 11 above the base 2, and performing a heating baking process of heating from room temperature to 1050-1100 ℃ at a heating rate of 250-350 ℃/h and preserving heat for 3-5h, wherein the first nanocrystalline master alloy 4 is in a round table shape, gradually reduces in radial dimension from top to bottom, and is matched with the cavity 11 of the barrel 1; the first nanocrystalline master alloy 4 is an iron-based nanocrystalline alloy; the iron-based nanocrystalline alloy comprises 8.5 to 9.0 mass percent of Si, 1.55 to 1.6 mass percent of B, 5.5 to 6.0 mass percent of Nb, 1.25 to 1.3 mass percent of Cu and the balance of Fe;
s3, after the heating and baking process is finished, the cylinder body 1 of the furnace building die is pulled out of the intermediate frequency induction furnace crucible 5, the high-temperature sintering process is performed, and then the temperature is reduced to obtain molten steel and the intermediate frequency induction furnace crucible 5 with a sintering furnace lining, wherein the high-temperature sintering process comprises the following steps:
the first stage high temperature sintering treatment, namely, after the first nanocrystalline master alloy 4 is completely melted by full power heating of the medium frequency induction furnace, continuously adding the second nanocrystalline master alloy until the second nanocrystalline master alloy is completely melted, wherein the addition amount of the second nanocrystalline master alloy is that the highest liquid level of molten steel formed after the first nanocrystalline master alloy 4 and the second nanocrystalline master alloy are completely melted is equal to the furnace mouth of the crucible 5 of the medium frequency induction furnace; the second nanocrystalline master alloy has the same chemical composition as the first nanocrystalline master alloy;
the second stage high temperature sintering treatment, continuously heating up to 1620-1650 ℃ with full power of the medium frequency induction furnace, and preserving heat for 0.5-1.5h;
and in the third stage, the high-temperature sintering treatment is carried out, the temperature is continuously increased by the full power of the medium-frequency induction furnace, the temperature is increased to 1680-1720 ℃, and the heat preservation time is 7-15min.
Further, in the heating and baking process and the high-temperature sintering process, a furnace cover with temperature measurement and argon protection is arranged on a crucible of the intermediate frequency induction furnace for temperature monitoring, and the furnace cover is connected with a PLC temperature control module of the intermediate frequency induction furnace.
The present invention will be described in further detail with reference to specific examples.
Embodiment 1 an intermediate frequency induction furnace building mold and a furnace building method
The intermediate frequency induction furnace building mold comprises: 301 stainless steel cylinder and pure iron base, the cylinder is round table type, has upper surface and lower surface and is opening structure and is round table type cavity and has wall thickness of equal wall thickness and wall thickness 7-10mm, wherein, the radial dimension of cavity upper surface is 700mm, cavity height is 1200mm, the waist line of cylinder longitudinal section and central axisThe included angle of (2) is 5-10 degrees, and the outer surface of the side wall of the cylinder body is uniformly coated with a release agent with the thickness of 2-3mm, wherein the release agent comprises: 95% of sheet BN (100-300 μm in size and 50-80 μm in thickness) and 3% of irregular sheet B 2 O 3 (30-60 μm in size and 10-30 μm in thickness) and 2% of spherical nano Si 3 N 4 (D50 particle size is 60-150 nm), the base is a solid cylinder, the diameters of the upper surface and the lower surface are 560-600mm, and the thickness of the bottom surface is 2-3mm; the base is positioned in the cavity at the lower end of the cylinder, a gap of 3-5mm is formed between the outer wall surface of the base and the inner surface of the side wall of the cylinder, and plastic materials are filled in the gap.
A furnace construction method for constructing a furnace mold by using an intermediate frequency induction furnace, comprising:
s1, firstly filling ramming materials in the bottom wall of a crucible of an intermediate frequency induction furnace and performing a furnace bottom ramming process, then placing a barrel of a furnace building die in the crucible of the intermediate frequency induction furnace, and then filling ramming materials in a gap between the inner wall of the crucible of the intermediate frequency induction furnace and the side wall of the barrel of the furnace building die and performing a furnace lining ramming process, wherein the furnace bottom ramming process and the furnace lining ramming process are dry knotting;
s2, after the furnace lining ramming process is finished, adding a base into a cavity of a barrel of a furnace building die, then adding a first nanocrystalline master alloy with 75% of the cavity volume, and performing a heating and baking process, wherein the first nanocrystalline master alloy comprises the following components in percentage by mass: 8.6% of Si, 1.6% of B, 5.65% of Nb, 1.3% of Cu and the balance of Fe;
s3, after the heating and baking process is finished, pulling out a cylinder body of the furnace building die from a crucible of the intermediate frequency induction furnace, performing a high-temperature sintering process, then cooling to obtain molten steel, and performing a belt manufacturing process, wherein the high-temperature sintering process comprises the following steps:
the first stage high temperature sintering treatment, namely, after the first nanocrystalline master alloy is completely melted by full power heating of the medium frequency induction furnace, continuously adding the second nanocrystalline master alloy until the second nanocrystalline master alloy is completely melted, wherein the addition amount of the second nanocrystalline master alloy is that the highest liquid level of molten steel formed by the first nanocrystalline master alloy and the second nanocrystalline master alloy after the first nanocrystalline master alloy is completely melted is equal to the furnace mouth of a crucible of the medium frequency induction furnace; the second nanocrystalline master alloy has the same chemical composition as the first nanocrystalline master alloy;
the second stage high temperature sintering treatment, continuously heating up to 1620-1650 ℃ with full power of the medium frequency induction furnace, and preserving heat for 0.5-1.5h;
the third stage of high temperature sintering treatment, in which the temperature is continuously raised to 1680-1720 ℃ with the full power of the medium frequency induction furnace, and the heat preservation time is 7-15min; see table 1 for specific process parameters.
Comparative example 1
The intermediate frequency induction furnace construction mold in comparative example 1 was the same as in example 1, the furnace construction method was not subjected to the third stage high temperature sintering treatment, and the rest was the same as in example 1, and specific process parameters are shown in table 1.
Comparative example 2
The medium frequency induction furnace in comparative example 2 comprises an integrally formed universal carbon structural steel cylinder body and a base, wherein the cylinder body is a cylinder, is provided with a cavity with an opening structure on the upper surface and the lower surface and a cylinder body, and is provided with a side wall with equal wall thickness and wall thickness of 7-10mm, the height of the cylinder body is 1200mm, the diameters of the upper surface and the lower surface of the cavity body are 700mm, the base is a solid cylinder, and the thickness of the bottom surface is 14mm; the base is positioned in the cavity at the lower end of the cylinder body and is integrally formed with the cylinder body.
A furnace construction method for constructing a furnace mold by using an intermediate frequency induction furnace, comprising:
s1, firstly filling ramming material in the bottom wall of a crucible of an intermediate frequency induction furnace and performing a furnace bottom ramming process, then placing a furnace building mold of the intermediate frequency induction furnace in the crucible of the intermediate frequency induction furnace, and then filling ramming material in a gap between the inner wall of the crucible of the intermediate frequency induction furnace and the outer wall of the furnace building mold and performing a furnace lining ramming process, wherein the furnace bottom ramming process and the furnace lining ramming process are dry knotting;
s2, after the furnace lining tamping process is finished, carrying out a heating and baking process;
s3, after the heating and baking process is finished, adding an industrial 1k101 amorphous master alloy sintering material (1 k101 amorphous master alloy comprises 5.2 mass percent of Si, 2.5 mass percent of B and the balance of Fe) with the cavity volume into a cavity of a cylinder body of a furnace building die, performing a high-temperature sintering process to obtain molten steel, and pouring out;
s4, after the sintering and baking process is finished, adding high-purity materials (industrialized 1k107 nanocrystalline master alloy) with the cavity volume into the cavity of the cylinder of the furnace building die, performing a furnace washing process to obtain molten steel, and pouring out;
and S5, after the furnace washing process is finished, adding 2 tons of nanocrystalline master alloy into the cavity of the cylinder of the furnace building die, and carrying out a nanocrystalline master alloy (industrialized 1k107 nanocrystalline master alloy) remelting process to obtain molten steel.
S6, after the remelting process is finished, entering a tape making process.
The specific process parameters are shown in Table 1.
TABLE 1
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In summary, on the basis of knotting the intermediate frequency furnace lining by the dry method, the furnace building mold composed of the heat-resistant stainless steel cylinder body and the pure iron base is used, and the release agent is coated on the outer surface of the side wall of the cylinder body, so that the cylinder body of the furnace building mold can be smoothly separated from the intermediate frequency induction furnace crucible, the heat-resistant stainless steel cylinder body can be repeatedly used, the sintering layer on the inner surface of the quartz crucible of the intermediate frequency furnace is more compact, the furnace building efficiency is improved, and the service life of the furnace lining is prolonged. The nanocrystalline master alloy is melted and sintered along with the furnace, the furnace lining is baked, the functions of furnace burden sintering and high-purity master alloy cleaning of the furnace lining are realized, the cost of 2 master alloys can be saved for each furnace building, the production rhythm is greatly improved, and the production cost is obviously reduced.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (24)
1. The utility model provides a medium frequency induction furnace builds stove mould which characterized in that includes: the cylinder body is provided with a cavity with an opening structure on the upper surface and the lower surface and a side wall with a certain thickness;
the base is arranged in the cavity at the lower end of the cylinder body, and a gap is formed between the outer wall surface of the base and the inner surface of the side wall of the cylinder body;
the radial dimension of the cavity of the cylinder body is gradually reduced from top to bottom to form a truncated cone shape; the side wall of the cylinder body is equal in wall thickness; the outer surface of the side wall of the cylinder body is coated with a release agent along the circumferential direction of the side wall; the gap is filled with a plastic material.
2. The intermediate frequency induction furnace building mold according to claim 1, wherein the coating thickness of the mold release agent is not less than 1mm.
3. The intermediate frequency induction furnace building mold according to claim 1, wherein the mold release agent comprises, in mass percent: 90% -96% of boron nitride, 3% -5% of boron oxide and 1% -5% of silicon nitride.
4. A furnace building mould of an intermediate frequency induction furnace according to claim 3, wherein the boron nitride is sheet-shaped, has a size of 100-300 μm and a thickness of 50-80 μm; the boron oxide is in an irregular sheet shape, the size is 30-60 mu m, and the thickness is 10-30 mu m; the silicon nitride is spherical or spheroidic particles, and the D50 particle size is 60-150nm.
5. The intermediate frequency induction furnace building mold according to claim 1, wherein the wall thickness of the side wall of the cylinder is 7-10mm;
the included angle between the waist line of the longitudinal section of the cylinder body and the central axis is 5-10 degrees.
6. The furnace building mold of the medium frequency induction furnace according to claim 1, wherein the cylinder is made of stainless steel and comprises one of SUS301S, SUS309S, SUS310S, SUS 314.
7. The intermediate frequency induction furnace building mold according to claim 1, wherein the base is made of pure iron;
the base is a solid cylinder, and the thickness of the base is 2-3mm.
8. The intermediate frequency induction furnace building mold according to claim 1, wherein a gap between an outer wall surface of the base and an inner surface of a side wall of the cylinder is 3-5mm.
9. The intermediate frequency induction furnace building mold according to claim 1, wherein the plastic material comprises, in mass percent: 67-68% of aluminum oxide, 25-28% of silicon dioxide, 2-3% of phosphorus pentoxide and the balance of unavoidable impurities.
10. A furnace construction method using the intermediate frequency induction furnace construction mold according to any one of claims 1 to 9, comprising:
s1, firstly filling ramming materials in the bottom wall of a crucible of an intermediate frequency induction furnace, performing a furnace bottom ramming process, then placing a barrel of a furnace building mold in the crucible of the intermediate frequency induction furnace, and then filling ramming materials in a gap between the inner wall of the crucible of the intermediate frequency induction furnace and the side wall of the barrel of the furnace building mold, and performing a furnace lining ramming process;
s2, after the furnace lining ramming process is finished, placing a base of a furnace building die in the intermediate frequency induction furnace crucible and coaxial with a cylinder of the furnace building die, adding a first nanocrystalline master alloy into a cavity of the cylinder of the furnace building die, and carrying out a heating and baking process;
and S3, after the heating and baking process is finished, pulling out the cylinder body of the furnace building die from the intermediate frequency induction furnace crucible, performing a high-temperature sintering process, and then cooling to obtain molten steel and the intermediate frequency induction furnace crucible with a sintering furnace lining.
11. The furnace construction method according to claim 10, wherein the intermediate frequency induction furnace crucible is a quartz crucible.
12. The furnace construction method according to claim 10, wherein in step S1, the furnace bottom ramming step and the lining ramming step are both dry knotting.
13. The furnace construction method according to claim 10, wherein in the temperature raising and baking step, the temperature is raised from room temperature to 1050 to 1100 ℃ at a temperature raising rate of 250 to 350 ℃/h, and the temperature is kept for 3 to 5 hours.
14. The furnace construction method according to claim 10, wherein the volume of the first nanocrystalline master alloy is 70% -80% of the volume of the cavity of the cylinder.
15. The furnace construction method according to claim 10, wherein the first nanocrystalline master alloy is in a truncated cone shape and gradually reduces in radial dimension from top to bottom, and is adapted to the cavity of the cylinder.
16. The furnace construction method according to claim 10, wherein the first nanocrystalline master alloy is an iron-based nanocrystalline alloy; the iron-based nanocrystalline alloy comprises 8.5-9.0% of Si, 1.55-1.6% of B, 5.5-6.0% of Nb, 1.25-1.3% of Cu and the balance of Fe in percentage by mass.
17. The furnace construction method according to any one of claims 10, wherein in step S3, the high-temperature sintering process is: firstly, performing a first-stage high-temperature sintering treatment to enable the first nanocrystalline master alloy to be completely melted, and then continuously adding the second nanocrystalline master alloy until the second nanocrystalline master alloy is completely melted; then continuously heating to perform second-stage high-temperature sintering treatment; and then continuously heating to perform the third-stage high-temperature sintering treatment.
18. The furnace construction method according to claim 17, wherein the first stage high temperature sintering process is performed at a full power of the medium frequency induction furnace.
19. The furnace construction method according to claim 17, wherein the second nanocrystalline master alloy is added in such an amount that the highest liquid level at which the molten steel is formed after the first nanocrystalline master alloy and the second nanocrystalline master alloy are completely melted is leveled with the furnace mouth of the intermediate frequency induction furnace crucible.
20. The furnace construction method according to claim 17, wherein the second nanocrystalline master alloy has the same chemical composition as the first nanocrystalline master alloy.
21. The furnace construction method according to claim 17, wherein the temperature of the second stage high temperature sintering treatment is 1620-1650 ℃ and the holding time is 0.5-1.5h.
22. The furnace construction method according to claim 17, wherein the temperature of the third stage high temperature sintering treatment is 1680 to 1720 ℃ and the holding time is 7 to 15min.
23. The furnace construction method according to claim 10, wherein in the heating baking process and the high-temperature sintering process, a furnace cover with temperature measurement and argon protection is arranged on the crucible of the intermediate frequency induction furnace for temperature monitoring, and the furnace cover is connected with a PLC temperature control module of the intermediate frequency induction furnace.
24. A medium frequency induction furnace obtainable by the furnace construction method of any one of claims 10-23, said medium frequency induction furnace being applied in nanocrystalline strip production.
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Denomination of invention: A medium frequency induction furnace construction mold and its construction method Granted publication date: 20231201 Pledgee: Bank of Nanjing Co.,Ltd. Changzhou Branch Pledgor: Changzhou Chuangming magnetic material technology Co.,Ltd. Registration number: Y2024980002676 |