Iron-based amorphous nanocrystalline alloy smelting method

Abstract

The application relates to a ferrous-based amorphous nanocrystalline alloy smelting method, which comprises the following steps: S1, first-time furnace charging of raw materials; S2, power feeding heating; S3, power feeding to maximum power and then adding the remaining pure iron, and after the solid materials in the furnace are all put into the molten steel, entering a refining stage; S4, in the refining stage, power feeding to maximum power heating for 10 min; S5, insulation, reducing the power to medium power 60-70KW, and heating for 3 min; S6, second-time material feeding, and attention is paid to ensuring that the solid materials do not completely cover the liquid surface after adding each kind of raw material, and the flowing molten steel can be seen, so as to prevent crust formation; S7, power feeding 110KW for 10 min, after the solid materials in the furnace are all put into the molten steel, starting argon, and controlling the flow rate at 1L / min; S8, second-time refining, power feeding to maximum power heating for 3 min; reducing the power to medium power 60-70KW, and heating for 3 min. According to the ferrous-based amorphous nanocrystalline alloy smelting method, after alloying in a smelting furnace, the ingot is not needed to be cast and remelted, direct strip production is realized, energy consumption is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of alloy smelting, and more specifically, to a method for smelting iron-based amorphous nanocrystalline alloys. Background Technology

[0002] Currently, in order to achieve the required purity of molten steel for strip production and reduce nozzle blockage, the manufacturing process of iron-based nanocrystalline alloy strip products adopts a two-step method during smelting. First, pure iron, industrial silicon, ferroborone, ferroniobium, and cathode copper are smelted into an alloy in a smelting furnace, which is then cast and cooled to form an alloy transfer ingot. During the manufacturing of strip products, the transfer ingot is then added to a vacuum furnace for secondary melting.

[0003] The disadvantage of this method is that it adds a cooling and heating process, which greatly increases energy consumption and significantly reduces production efficiency.

[0004] Therefore, there is an urgent need for a smelting method that can greatly save energy to achieve the smelting of iron-based amorphous nanocrystalline alloys. Summary of the Invention

[0005] The technical problem to be solved by this invention is the high energy consumption and low efficiency caused by the two-step smelting of iron-based amorphous nanocrystalline ultrathin strips. It saves energy consumption during the smelting of iron-based amorphous nanocrystalline alloys, eliminates the cooling and reheating process, maintains heat, and avoids smelting with secondary heating.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for smelting iron-based amorphous and nanocrystalline alloys, comprising the following steps: S1, initial loading of raw and auxiliary materials into the furnace, including: pure iron, industrial silicon, ferroborone, ferroniobium, and slag remover; S2, powering on for heating; when using a cold furnace for smelting, to prevent thermal shock, preheating at low power for 5 minutes (20-30KW) followed by heating at medium power for 5 minutes (60-70KW); when using a hot furnace for smelting, directly heating at medium power for 5 minutes (60-70KW); S3, powering on to maximum power and gradually adding the remaining pure iron until the furnace is filled with pure iron. After all solid material has entered the molten steel, the refining stage begins; S4, refining stage: power up to maximum for 10 minutes; S5, heat preservation: reduce power to medium (60-70KW) and heat for 3 minutes; S6, secondary feeding: ensure that the solid material does not completely cover the molten steel surface after each addition, allowing the flowing molten steel to be visible, to prevent crust formation; S7, power up to 110KW for 10 minutes: after all solid material has entered the molten steel, turn on argon gas, controlling the flow rate at 1L / min; S8, secondary refining: power up to maximum for 3 minutes; reduce power to medium (60-70KW) and heat for 3 minutes.

[0007] According to an embodiment of the present invention, the smelting method for iron-based amorphous nanocrystalline alloys may further include the following steps: S9, power off and let stand for 15-20 minutes; S10, add a special slag remover and let stand for 2 minutes; S11, remove slag, take a sample, let stand for 10 minutes, and then stop the argon gas. The special slag remover may be the slag remover disclosed in the prior application CN111411287A, but is not limited to this; the user can determine the specific slag remover according to actual needs.

[0008] According to an embodiment of the present invention, the smelting method of iron-based amorphous nanocrystalline alloy may further include the following steps: S12, the temperature of the molten steel is increased to 1350°C, the steel is poured into an intermediate ladle for strip making, and strip making is carried out.

[0009] According to an embodiment of the present invention, in step S1, during the raw material feeding stage, it can be ensured that the refractory ferroniobium is heated in the high-temperature zone of the medium-frequency furnace, that is, in the middle of the medium-frequency furnace.

[0010] According to an embodiment of the present invention, step S1 includes: first, a special slag-removing agent is placed at the bottom of the furnace, then pure iron is loaded into the furnace to half the furnace cavity, then some ferroboron and some industrial silicon are used to fill the gaps in the pure iron to prevent ferroniobium from falling into the bottom of the medium-frequency furnace from the gaps in the material, then all the ferroniobium is added, and the remaining pure iron is added above the ferroniobium to the top of the furnace cavity.

[0011] According to an embodiment of the present invention, in step S5, a pure iron rod can be used to stir clockwise from the outside to the inside along the inner side of the furnace lining to ensure that the niobium iron and pure iron are completely melted.

[0012] According to an embodiment of the present invention, in step S6, the secondary feeding may include the sequential addition of ferroborone, industrial silicon, and electrolytic copper.

[0013] According to an embodiment of the present invention, the smelting furnace used for smelting can be a 200kg medium-frequency smelting furnace.

[0014] According to an embodiment of the present invention, the temperature of the molten steel during the entire smelting process shall not exceed 1550°C. If it exceeds 1550°C, the power can be appropriately adjusted and reduced.

[0015] According to an embodiment of the present invention, the maximum power can be 250KW.

[0016] Compared with the prior art, the technical solution provided by the embodiments of the present invention can achieve at least the following beneficial effects:

[0017] Based on the melting points and alloying characteristics of pure iron, industrial silicon, ferroboron, ferroniobium, and cathode copper, this invention patent employs a special feeding sequence, method, and specific heating process. After alloying pure iron, industrial silicon, ferroboron, ferroniobium, and cathode copper in a smelting furnace, the process directly produces strips without the need for ingot casting and remelting. This breakthrough solves the problem of achieving steel purity through a two-step process, reduces energy consumption, shortens production time, and improves production efficiency.

[0018] The smelting method of this invention can achieve the goal of manufacturing iron-based nanocrystalline ribbon products with a thickness of less than 25 micrometers in a single smelting process while ensuring the purity of the steel. On the one hand, the special feeding method and heating process can reduce the smelting time, achieve alloying, and fully melt niobium-iron. On the other hand, this invention combines the slag composition generated by iron-based nanocrystalline alloys and uses a special slag remover to ensure the purity of the molten steel. The special slag remover can lighten the newly formed large liquid particles of impurities in the molten steel by combining certain substances with oxygen, float them to the surface of the molten steel, and remove them. This has a significant effect on improving the purity of the molten steel, reducing the strip making nozzle blockage rate, and improving the quality of ultra-thin strips. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0020] Figure 1 This is a flowchart illustrating a method for smelting iron-based amorphous nanocrystalline alloys according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram illustrating the charging process for a method of smelting iron-based amorphous nanocrystalline alloys according to an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0024] Figure 1 This is a flowchart illustrating a method for smelting iron-based amorphous nanocrystalline alloys according to an embodiment of the present invention.

[0025] like Figure 1 As shown, the method for smelting iron-based amorphous nanocrystalline alloys includes the following steps:

[0026] S1. The first loading of raw and auxiliary materials into the furnace includes: pure iron 6, industrial silicon 3, ferroborone 7, ferroniobium 5, and slag remover 4.

[0027] S2. Power supply heating; When using a cold furnace for smelting, in order to prevent thermal shock, preheat with low power for 5 minutes (20-30KW) and then heat with medium power for 5 minutes (60-70KW); When using a hot furnace for smelting, directly heat with medium power for 5 minutes (60-70KW).

[0028] S3. Power is supplied to the maximum power and the remaining pure iron 2 is added successively until all the solid material in the furnace enters the molten steel, and then the refining stage begins.

[0029] S4, Refining stage: Power is supplied to the maximum power for heating for 10 minutes.

[0030] S5. Keep warm, reduce the power to medium power 60-70KW, and heat for 3 minutes.

[0031] S6. Secondary feeding: Ensure that the solid material does not completely cover the liquid surface and that the flowing molten steel is visible after each addition to prevent crust formation.

[0032] S7, power supply 110KW, 10min. After all the solid material in the furnace has entered the molten steel, turn on the argon gas and control the flow rate at 1L / min.

[0033] S8. Secondary refining: Power up to maximum power and heat for 3 minutes; reduce power to medium power (60-70KW) and heat for 3 minutes.

[0034] Based on the melting point and alloying characteristics of pure iron (6), industrial silicon (3), ferroboron (7), ferroniobium (5), and cathode copper, this invention patent employs a special feeding sequence, method, and specific heating process. After alloying pure iron (6), industrial silicon (3), ferroboron (7), ferroniobium (5), and cathode copper in the smelting furnace, the process directly produces strips without the need for ingot casting and remelting. This breakthrough solves the problem of achieving steel purity through a two-step process, reduces energy consumption, shortens production time, and improves production efficiency.

[0035] According to one or more embodiments of the present invention, the method for smelting iron-based amorphous nanocrystalline alloys further includes the following steps:

[0036] S9. Power off and let stand still for 15-20 minutes.

[0037] S10. Add the special slag remover and let stand for 2 minutes. The special slag remover can be the slag remover disclosed in the prior application CN111411287A, and is not limited to this. Users can choose according to their actual needs.

[0038] S11. Remove slag, take samples, let stand for 10 minutes, and then stop the argon gas.

[0039] This invention combines the slag composition of iron-based nanocrystalline alloys with a special slag-removing agent to ensure the purity of molten steel.

[0040] According to one or more embodiments of the present invention, the method for smelting iron-based amorphous nanocrystalline alloys further includes the following steps:

[0041] S12. The temperature of the molten steel is increased to 1350℃, and the steel is poured into the tundish for strip making.

[0042] Figure 2 This is a schematic diagram illustrating the charging process for a method of smelting iron-based amorphous nanocrystalline alloys according to an embodiment of the present invention.

[0043] like Figure 2 As shown, in step S1, during the raw material feeding stage, it is necessary to ensure that the refractory ferroniobium 5 is heated in the high-temperature zone of the medium-frequency furnace, that is, in the middle of the medium-frequency furnace.

[0044] According to one or more embodiments of the present invention, step S1 includes: first, placing a special slag remover 4 into the furnace bottom, then loading pure iron 6 into the furnace to half the furnace cavity 1, then filling the gaps in the pure iron 6 with a portion of ferroboron 7 and a portion of industrial silicon 3 to prevent ferroniobium 5 from falling into the furnace bottom of the medium frequency furnace from the material gaps, then adding all of the ferroniobium 5, and adding the remaining pure iron 2 to the top of the furnace cavity 1 above the ferroniobium 5.

[0045] According to one or more embodiments of the present invention, in step S5, a pure iron rod is used to stir clockwise from the outside to the inside along the inner side of the furnace lining to ensure that ferroniobium 5, pure iron 6 or 2 are completely melted.

[0046] According to one or more embodiments of the present invention, in step S6, the secondary feeding includes the sequential addition of ferroborone 7, industrial silicon 3, and electrolytic copper.

[0047] According to one or more embodiments of the present invention, the smelting furnace used for smelting is a 200kg medium-frequency smelting furnace.

[0048] According to one or more embodiments of the present invention, the temperature of the molten steel during the entire smelting process shall not exceed 1550°C. If it exceeds 1550°C, the power shall be appropriately adjusted and reduced.

[0049] According to one or more embodiments of the present invention, the maximum power can be 250KW.

[0050] The smelting process of this invention is divided into two stages: initial feeding of raw and auxiliary materials into the furnace, heating, refining, secondary feeding of remaining raw materials into the furnace, heating, refining, and slag removal. During use, in the raw material feeding stage, it is essential to ensure that the refractory ferroniobium 5 is placed in the high-temperature zone of the medium-frequency furnace, i.e., the middle of the furnace. First, 41 bags of a special slag-removing agent are placed at the bottom of the furnace. Then, 70*70*140mm block-shaped pure iron 6 is loaded into the furnace up to halfway up the furnace cavity 1. Next, 1kg of ferroboron 7 and 1kg of industrial silicon 3 are used to fill the gaps in the pure iron 6. Afterward, all of the ferroniobium 5 is added, with the remaining pure iron 2 added above the ferroniobium 5 to the top of the furnace cavity 1. The initial addition amount of pure iron 6 should be determined based on the material height. The ferroniobium 5 should be placed at half the height of the medium-frequency furnace coil. The ferroboron 7 and industrial silicon 3 should fill the gaps in the pure iron 6 to prevent the ferroniobium 5 from falling into the furnace bottom through the material gaps. During the initial heating phase in a cool furnace, to prevent thermal shock, preheat at a low power (20-30KW) for 5 minutes; then heat at a medium power (60-70KW) for 5 minutes. In a hot furnace, directly heat at a medium power (60-70KW) for 5 minutes. Then, increase the power to maximum and gradually add the remaining pure iron 2 until all solid materials are incorporated into the molten steel. At the refining stage, increase the power to maximum for 10 minutes; then reduce the power to a medium power (60-70KW) and heat for 3 minutes. Use a pure iron rod to stir clockwise from the outside to the inside of the furnace lining to ensure complete melting of the niobium iron 5 and the first portion of pure iron 6. For the second feeding, add the remaining ferroborone 7, industrial silicon 3, and electrolytic copper in sequence. Ensure that the solid material does not completely cover the molten steel surface after each addition, so that the flowing molten steel is visible, to prevent crust formation. Power is supplied at 110KW for 10 minutes. After all solid material in the furnace has entered the molten steel, argon gas is turned on, with the flow rate controlled at 1L / min. For further refining, power is supplied to maximum power for 3 minutes; then the power is reduced to medium power (60-70KW) and heated for 3 minutes. After power is cut off and the mixture is allowed to stand for 15-20 minutes, a special slag-removing agent is added, and the mixture is allowed to stand for 2 minutes. Slag is removed, samples are taken, and the mixture is allowed to stand for 10 minutes. Argon gas is then stopped, and the molten steel temperature is raised to 1350℃. The steel is then poured into an tundish for strip making. Throughout the entire smelting process, the molten steel temperature must not exceed 1550℃. If this temperature is exceeded, the power is adjusted appropriately to lower the temperature.

[0051] The smelting method of this invention can achieve the goal of manufacturing iron-based nanocrystalline ribbon products with a thickness of less than 25 micrometers in a single smelting process while ensuring the purity of the steel. On the one hand, the special feeding method and heating process can reduce the smelting time, achieve alloying, and fully melt the niobium iron 5. On the other hand, the special slag remover 4 can lighten the newly formed large liquid particles of impurities in the molten steel by combining certain substances with oxygen, float them to the surface of the molten steel, and remove them. This has a significant effect on improving the purity of the molten steel, reducing the strip making nozzle blockage rate, and improving the quality of ultra-thin strips.

[0052] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. A method for smelting iron-based amorphous nanocrystalline alloys, comprising the following steps: S1, the first time the raw and auxiliary materials are charged into the furnace, the raw and auxiliary materials include: Pure iron, industrial silicon, ferroborone, ferroniobium, slag remover The step S1 includes: first, a special slag-removing agent is placed at the bottom of the furnace, then 70*70*140 block pure iron is loaded into the furnace to half the furnace cavity, then 1kg of ferroboron and 1kg of industrial silicon are used to fill the gaps in the pure iron to prevent ferroniobium from falling into the bottom of the medium frequency furnace from the gaps in the material, then all the ferroniobium is added, and the remaining pure iron is added to the top of the furnace cavity above the ferroniobium. S2. Power supply heating; When using a cold furnace for smelting, in order to prevent thermal shock, preheating with low power for 5 minutes (20-30KW) is required, followed by heating with medium power for 5 minutes (60-70KW); When using a hot furnace for smelting, heating with medium power for 5 minutes is required directly (60-70KW). S3. Power is supplied to the maximum power and the remaining pure iron is added successively until all the solid material in the furnace enters the molten steel and then the refining stage begins. S4, Refining stage: Power is supplied to the maximum power for heating for 10 minutes; S5. Keep warm, reduce the power to medium power 60-70KW, and heat for 3 minutes; S6. Secondary feeding: Secondary feeding includes adding ferroborone, industrial silicon, and electrolytic copper in sequence. Note that after each raw material is added, it is necessary to ensure that the solid material does not completely cover the liquid surface and that the flowing molten steel can be seen to prevent crust formation. S7, power supply 110KW, 10min, after all solid materials in the furnace have entered the molten steel, turn on the argon gas, and control the flow rate at 1L / min; S8. Secondary refining: Power up to maximum power and heat for 3 minutes; reduce power to medium power (60-70KW) and heat for 3 minutes.

2. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1 further includes the following steps: S9. Power off and let stand still for 15-20 minutes; S10. Add the sludge-removing agent and let stand for 2 minutes. S11. Remove slag, take samples, let stand for 10 minutes, and then stop the argon gas.

3. The iron-based amorphous nanocrystalline alloy smelting method as described in claim 2 further includes the following steps: S12. The temperature of the molten steel is increased to 1350℃, and the steel is poured into the tundish for strip making.

4. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1, wherein, In step S1, during the raw material feeding stage, it is necessary to ensure that the refractory ferroniobium is heated in the high-temperature zone of the medium-frequency furnace, that is, in the middle of the medium-frequency furnace.

5. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1, wherein, In step S5, a pure iron rod is used to stir clockwise from the outside to the inside along the inner side of the furnace lining to ensure that the niobium iron and pure iron are completely melted.

6. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1, wherein, The smelting furnace used is a 200kg medium-frequency smelting furnace.

7. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1, wherein, The temperature of the molten steel must not exceed 1550℃ during the entire smelting process. If it exceeds 1550℃, the power should be adjusted and reduced accordingly.

8. The method for smelting iron-based amorphous nanocrystalline alloys as described in claim 1, wherein, The maximum power is 250KW.

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