CN115505746A - Smelting method of electroslag remelting ultra-clean steel - Google Patents

Smelting method of electroslag remelting ultra-clean steel Download PDF

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CN115505746A
CN115505746A CN202211042240.9A CN202211042240A CN115505746A CN 115505746 A CN115505746 A CN 115505746A CN 202211042240 A CN202211042240 A CN 202211042240A CN 115505746 A CN115505746 A CN 115505746A
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slag
electroslag
smelting
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metal
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张福利
侯自兵
郭瑞华
齐紫阳
李瑞杰
张灿
郭福在
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Chongqing University
HBIS Co Ltd
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HBIS Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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

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Abstract

The invention discloses a smelting method of electroslag remelting ultra-clean steel, which adopts a stripping crystallizer to carry out electroslag smelting; in the smelting process, 0.1-0.5L/min of high-purity gas which does not participate in the reaction is blown into the slag pool at the positions evenly distributed in a circle at the middle lower part of the slag pool. The slag pool of the method can accelerate convection circulation under the stirring of high-purity gas bubbles, which can effectively increase the scouring effect of slag on the end surface of the electrode, force metal molten drops not to grow naturally and only separate from the electrode under a smaller size; meanwhile, the molten drop is continuously impacted and broken by slag flow and high-purity gas bubbles in the falling process, the size of the molten drop is further reduced, the specific surface area of the molten drop is increased, the contact interface of slag and metal is obviously increased, and the reaction process is accelerated. The invention can greatly reduce the size of the metal molten drop and obviously reduce the falling speed of the molten drop, thereby increasing the reaction time of the slag metal and improving the impurity removing efficiency. The content of impurities and sulfur in the ultra-clean steel smelted by the method is lower than that in the traditional electroslag remelting process by more than 50 percent.

Description

Smelting method of electroslag remelting ultra-clean steel
Technical Field
The invention relates to an electroslag remelting method, in particular to a smelting method of electroslag remelting ultra-clean steel.
Background
Electroslag metallurgy is one of the major breakthroughs of special metallurgical technology in the 20 th century. Electroslag metallurgy has been developed vigorously since hopkins, america, acquired electroslag patents in 1940. At present, electroslag steel is widely used in the industrial fields of aviation, aerospace, electric power and the like. However, some high-end materials with higher requirements on harmful impurity components, such as part of high-temperature alloys, corrosion-resistant alloys and ultra-clean steels, are produced by adopting the triple process of vacuum induction melting, electroslag remelting and vacuum consumable melting.
The ultra-clean steel produced by adopting the triple process has the disadvantages of high cost, long production period, high process difficulty and various defects. Therefore, metallurgists in various countries try to improve the electroslag smelting process and strive to obtain a more efficient method for removing inclusions and sulfur.
It is known that the removal of sulfur and impurities by electroslag is mainly concentrated in two stages of metal droplet formation and falling. In the smelting process, the consumable electrode is melted layer by layer along the surface at one end contacting with the molten slag to form a film and molten drops, and the slag-metal reaction is carried out to remove a part of impurities; when the molten drops fall, the metal passing through the slag layer can also react with the molten slag to remove impurities. It is obvious that in both processes, the contact area and the action time are the most critical factors affecting the efficiency of the inclusion removal.
It is well known that the contact area of slag-metal is exponential to the droplet size. The smaller the droplet size, the larger the specific surface area and the larger the contact area and vice versa. One metal molten drop with a certain mass is crushed into two metal molten drops with the same mass, and the specific surface area is increased by 2.17 times. Therefore, the control of obtaining smaller metal droplets in the electroslag process is very beneficial to removing impurities.
On the other hand, the action time of the slag metal is inversely proportional to the drop falling time. The metal molten drop leaves the electrode and begins to fall, and is subjected to the combined action of slag buoyancy, viscous force (equivalent to friction force) and gravity. The larger the slag buoyancy and the viscous force are resistance, the more favorable the slag buoyancy and the viscous force are for slowing down the falling speed and prolonging the retention time, the more favorable the slag-metal reaction degree is. Therefore, from the viewpoint of removing inclusions, the increase of the slag buoyancy and the viscous force in the remelting process should be controlled.
Many studies have been made by metallurgists in reducing the size of the molten droplets and increasing the buoyancy and viscous forces of the slag. In conclusion, the more successful work mainly focuses on the optimization of process parameters and the improvement of slag system components, but the work is beneficial and has disadvantages. For example, increasing the current will indeed reduce the droplet size and improve the slag washing effect, but will also increase the melting rate, causing solidification segregation of the metal and uneven structure; in addition, increasing the density and viscosity of slag can increase buoyancy and viscous force, improve the effect of removing impurities, but also thicken the slag crust, and cause the surface quality of cast ingots to be reduced due to difficult separation of steel slag.
In summary, no effective technical means for solving the problem of electroslag remelting and smelting of ultra-clean steel exists at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a smelting method of electroslag remelting ultra-clean steel, which can reduce the size of metal molten drops and the falling speed of the molten drops.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: adopting a stripping crystallizer to carry out electroslag smelting; in the smelting process, 0.1-0.5L/min of high-purity gas which does not participate in the reaction is blown into the slag pool at the positions of one circle uniformly distributed at the middle lower part of the slag pool.
The high-purity gas is horizontally blown into the slag pool.
The high-purity gas is symmetrically blown into two sides of the middle lower part of the slag pool.
The high-purity gas is high-purity helium.
The temperature of the high-purity gas is 200-300 ℃, and the pressure is 0.06-0.08 MPa.
The process idea of the invention is as follows: firstly, the slag pool can accelerate convection circulation under the stirring of high-purity gas bubbles, so that the scouring effect of slag on the end face of the electrode can be effectively increased, metal molten drops cannot grow naturally and only can be separated from the electrode under a smaller size. Meanwhile, the molten drops are continuously impacted and broken by slag flow and high-purity gas bubbles in the falling process, the size of the molten drops is further reduced, the specific surface area of the molten drops is increased, the contact interface of the slag and the metal is obviously increased, and the reaction process is accelerated.
Secondly, the broken molten drops can do convection motion along with the slag pool due to the mass reduction, thereby greatly prolonging the dropping path, increasing the retention time and fully carrying out the slag-metal reaction.
The analysis shows that the size and the acting time of the molten drop are two most key parameters for removing impurities such as inclusion, sulfur and the like in electroslag metallurgy, so that the method can effectively improve the impurity removing efficiency.
In addition, the choice of helium as the blowing medium is also related to its physicochemical properties. Helium is an inert gas, does not react with metals, and does not cause composition change as a blowing medium; meanwhile, the density of the alloy is smaller than that of argon, and a slag layer blown in can expand rapidly to float up quickly and cannot remain in steel; moreover, the helium is dehydrated, heated and stabilized before being filled, so that H cannot be increased, the slag temperature cannot be reduced to increase the operation difficulty, and the process adaptability is good. The dosage of the agent is also small, only 0.1-0.5L/min, and the agent is economical and practical.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method breaks through the traditional mode and method, interferes the electroslag smelting process by means of external force, can greatly reduce the size of metal molten drops, and obviously reduces the falling speed of the molten drops, thereby increasing the reaction time of slag and metal and improving the impurity removing efficiency. The invention does not need to smelt again after electroslag, and the content of impurities and sulfur in the smelted ultra-clean steel is lower than that of the traditional electroslag remelting by more than 50 percent.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic structural view of an electroslag remelting apparatus according to the present invention.
In the figure: 1-a consumable electrode; 2-a crystallizer; 3-air blowing holes; 4-steel ingot; 5-molten metal bath; 6-a slag bath; 7-high purity gas bubbles.
Detailed Description
The smelting method of the electroslag remelting ultraclean steel is suitable for electroslag steel, such as the ultraclean steel of GCr15, GH4169, W18Cr4V, NS333 and the like, adopts a stripping crystallizer, and is particularly suitable for a stripping crystallizer with the diameter of 300mm or more; the ingot-pulling type crystallizer is provided with at least two air blowing holes at the middle lower part of the slag pool, and the air blowing holes are uniformly distributed on the same plane at the periphery of the slag pool; the number of the air blowing holes is preferably two, and the two air blowing holes are symmetrically arranged on two sides of the slag pool; the ingot-pulling type crystallizer needs to be improved, and the following ingot-pulling type crystallizer structure can be adopted: as shown in fig. 1, 2 pores are symmetrically penetrated in the center of the middle part of a crystallizer 2, copper conduits are welded in parallel, the interface part is polished smoothly, the inner diameter of each conduit is 0.12-0.16 mm, and each conduit is a gas blowing hole 3; the air blowing holes 3 are horizontally arranged; the rest part of the crystallizer has the same structure as the conventional ingot-pulling crystallizer.
The following process is adopted: (1) Selecting a stripping crystallizer, placing an arc striking agent on a bottom water tank, and placing slag materials around the arc striking agent; installing a crystallizer 2, a consumable electrode 1 and a protective cover, and introducing argon;
(2) Switching on a smelting power supply, igniting and starting arc, adding slag materials, and entering a normal smelting stage when the temperature of slag rises to 1700-1800 ℃; the slag charge is baked before being added, and is preferably baked for 8 to 12 hours in a heating furnace at the temperature of between 600 and 650 ℃; the slag is melted to form a slag pool 6, and metal liquid drops formed by melting the consumable electrode 1 sink to the bottom of the slag pool 6 and gradually accumulate to form a metal molten pool 5; cooling and solidifying the molten metal pool 4 to form a steel ingot 4;
(3) And in the normal smelting stage, air blowing is started when the slag layer flows over the air blowing holes 3, and ingot drawing is started when the air blowing holes are positioned at the middle lower part of the slag layer until smelting is finished. And the gas blowing holes 3 horizontally blow high-purity gas which does not participate in the reaction and has a total flow of 0.1-0.5L/min into the middle lower part of the slag pool, and the high-purity gas is preferably high-purity helium. The high-purity helium is dehydrated, heated and subjected to pressure stabilization before being introduced into the crystallizer, and when the high-purity helium enters the crystallizer, the water content of the gas is less than or equal to 0.0001vol%, the temperature is 200-300 ℃, and the pressure is 0.06-0.08 MPa. High-purity gas bubbles 7 are formed in the slag pool 6 in the blowing process of the blowing holes 3, and molten drops are continuously impacted and broken by slag flow and the high-purity gas bubbles 7 in the falling process, so that the size of the molten drops is reduced, the specific surface area of the molten drops is increased, the dropping path is prolonged, the reaction process is accelerated, and the slag-metal reaction is fully carried out.
(4) And stopping blowing helium after the smelting is finished, and demoulding after 30-120 min.
Example 1: the smelting method of the electroslag remelting ultra-clean steel adopts the following specific process.
Electroslag smelting GCr15. The method specifically comprises the following steps: specification of ingot-pulling type crystallizer: phi 300 is multiplied by 700mm; consumable electrode specification: phi 200 is 2600mm; the steel comprises the following components: 1.02% of C, 0.24% of Si, 0.26% of Mn, 0.010% of P, 0.008% of S, 1.49% of Cr and the balance of inevitable impurities of Fe; slag component (wt): 70% CaF 2 、30%Al 2 O 3 (ii) a Slag amount: 28kg. 2 air blowing holes with the inner diameter of 0.12mm are symmetrically arranged in the middle of the crystallizer; the smelting process comprises the following steps:
(1) Polishing and welding the consumable electrode;
(2) Placing the slag charge in a heating furnace at 600 ℃ for baking for 8 hours;
(3) Laying solid slag arc striking agent, installing electrodes and introducing Ar into the crystallizer;
(4) Arc striking, slag adding and slag melting are carried out for 30min, and then the temperature is raised to 1750 ℃;
(5) In the smelting stage, high-purity helium with the temperature of 230 ℃, the pressure of 0.06MPa, the pressure of 0.3L/min and the water content of 0.00006vol% is blown into the slag layer when the slag layer overflows the gas blowing holes;
(6) Smelting until the position of the blowing hole is positioned at the middle lower part of the slag layer, and starting ingot drawing until the smelting is finished;
(7) Stopping blowing helium, and demoulding after 45 min.
(8) The crystallizer is used for smelting the electrodes with the same components and the same specifications by adopting the process, helium is not blown in the smelting process, a comparative experiment is carried out, and comparative electroslag is obtained in production. The electroslag obtained in this example (electroslag in the following method) and the comparative electroslag were measured, the size and quality of molten drops in the slag layer were shown in table 1, and the contents of sulfur phosphorus and non-metallic inclusions in the ingot were shown in table 2.
Table 1: size and number of electroslag remelting metal droplets
Figure DEST_PATH_IMAGE002
As shown in Table 1, the average grain diameter of the metal molten drops of the electroslag in the method is 2.86mm, while the average grain diameter of the metal molten drops of the electroslag is 7.44mm, which is reduced by 61.5 percent and the specific surface area is increased by 130 percent under the same mass; the residual amount of molten drops in the electroslag of the method is 130.7g, and the comparative electroslag is 80.9g, which shows that the retention time of the electroslag of the method is increased by 61.6 percent compared with the comparative electroslag.
Table 2: non-metallic inclusion and sulfur phosphorus content (wt) after electroslag smelting
Figure DEST_PATH_IMAGE004
As can be seen from Table 2, the total amount, rating and S content of the inclusion in the electroslag of the method are all lower than those of the comparative electroslag; wherein, the total amount of the inclusions is lower than 61.9 percent of the comparative electroslag, and the sulfur content is lower than 70.0 percent of the comparative electroslag.
Example 2: the smelting method of the electroslag remelting ultra-clean steel adopts the following specific process.
Electroslag smelting GH4169. The method specifically comprises the following steps: specification of ingot-pulling crystallizer: phi 220 multiplied by 600mm; consumable electrode specification: phi 160 x 1800mm; the steel comprises the following components: 0.05% of C, 0.008% of P, 0.005% of S, 19% of Cr, 3% of Mo, 52% of Ni, 19% of Fe, 5.2% of Nb, 0.5% of Al, 1.0% of Ti and inevitable impurities; slag component (wt): 50% of CaF 2 、25%CaO、20%Al 2 O 3 、5%TiO 2 (ii) a Slag amount: 10kg. 2 air blowing holes with the inner diameter of 0.16mm are symmetrically arranged in the middle of the crystallizer; smelting toolThe process comprises the following steps:
(1) Polishing, brightening and welding the consumable electrode;
(2) Placing the slag charge in a heating furnace at 600 ℃ for baking for 8 hours;
(3) Laying solid slag arc striking agent, installing electrodes and introducing Ar into the crystallizer;
(4) Arc striking is carried out by feeding, slag is added, the temperature is raised to 1700 ℃ after 15min of slag melting;
(5) In the smelting stage, high-purity helium with the temperature of 300 ℃, the pressure of 0.06MPa, the water content of 0.1L/min and the volume percent of 0.00009 is blown into the slag layer when the slag layer overflows the gas blowing holes;
(6) When the position of the blowing hole is positioned at the middle lower part of the slag layer, ingot drawing is started until the smelting is finished;
(7) Stopping blowing helium, and demoulding after 30 min.
(8) The crystallizer is used for smelting the electrodes with the same components and the same specifications by adopting the process, helium gas is not blown in the smelting process, a comparison experiment is carried out, and comparison electroslag is obtained in production. The electroslag obtained in this example (electroslag in the following method) and the comparative electroslag were measured, the size and quality of molten drops in the detected slag layer are shown in table 3, and the contents of sulfur phosphorus and non-metallic inclusions in the ingot are shown in table 4.
Table 3: size and number of electroslag remelting metal droplets
Figure DEST_PATH_IMAGE006
As shown in Table 3, the average grain diameter of the metal molten drops of the electroslag in the method is 1.49mm, while the average grain diameter of the metal molten drops of the electroslag in the method is 3.02mm, which is reduced by 50.7 percent and the specific surface area is increased by 103 percent under the same mass; the residual amount of molten drops in the electroslag slag is 81.4g, and the comparative electroslag is 50.5g, which shows that the retention time is increased by 61.4 percent compared with the comparative electroslag.
Table 4: non-metallic inclusion and sulfur phosphorus content (wt) after electroslag smelting
Figure DEST_PATH_IMAGE008
As can be seen from Table 4, the total amount, rating and S content of the electroslag inclusion in the method are all lower than those of the comparative electroslag. Wherein, the total amount of the inclusions is lower than 53.7 percent of the comparative electroslag, and the sulfur content is lower than 62.5 percent of the comparative electroslag.
Example 3: the smelting method of the electroslag remelting ultra-clean steel adopts the following specific process.
Electroslag smelting of W18Cr4V. The method specifically comprises the following steps: specification of ingot-pulling crystallizer: phi 550 multiplied by 1000mm; consumable electrode specification: phi 400X 3900mm; the steel comprises the following components: 0.75% of C, 0.30% of Si, 0.28% of Mn, 0.010% of P, 0.009% of S, 4% of Cr, 18% of W, 0.3% of Mo, 1.2% of V, and inevitable impurities. Slag component (wt): 40% of CaF 2 、30%CaO、30%Al 2 O 3 (ii) a Slag amount: 95kg. 3 air blowing holes with the inner diameter of 0.14mm are uniformly distributed on the plane of the middle part of the crystallizer; the smelting process comprises the following steps:
(1) Polishing, brightening and welding the consumable electrode;
(2) Placing the slag charge in a heating furnace at 620 ℃ for baking for 12h;
(3) Laying solid slag arc striking agent, installing electrodes and introducing Ar into the crystallizer;
(4) Starting power supply, adding slag, melting the slag for 60min, and heating to 1800 ℃;
(5) In the smelting stage, high-purity helium with the temperature of 200 ℃, the pressure of 0.08MPa, the water content of 0.5L/min and the water content of 0.0001vol% is blown into the slag layer when the slag layer overflows the gas blowing holes;
(6) Smelting until the position of the blowing hole is positioned at the middle lower part of the slag layer, and starting ingot drawing until the smelting is finished;
(7) Stopping blowing helium, and demoulding after 120 min.
(8) The crystallizer is used for smelting the electrodes with the same components and the same specifications by adopting the process, helium is not blown in the process, a comparative experiment is carried out, and comparative electroslag is obtained in production. The electroslag obtained in this example (electroslag in the method described below) and the comparative electroslag were examined, the size and quality of the molten drop in the slag layer are shown in table 5, and the contents of sulfur, phosphorus and non-metallic inclusions in the ingot are shown in table 6.
Table 5: size and number of electroslag remelting metal droplets
Figure DEST_PATH_IMAGE010
As shown in Table 5, the average grain size of the electroslag metal molten drops is 4.55mm, while the comparative electroslag is 9.67mm, the reduction is 52.9%, and the specific surface area is increased by 112% under the same mass; according to the method, the residual amount of molten drops in the electroslag is 165.9g, and the comparison electroslag is 97.8g, which shows that the retention time is increased by 69.6% compared with the comparison electroslag.
Table 6: non-metallic inclusion and sulfur phosphorus content (wt) after electroslag smelting
Figure DEST_PATH_IMAGE012
As can be seen from Table 6, the total amount, rating and S content of the electroslag inclusion of the invention are all lower than those of the comparative electroslag. Wherein, the total amount of the inclusions is lower than 62.4 percent of the comparative electroslag, and the sulfur content is lower than 73.6 percent of the comparative electroslag.
Example 4: the smelting method of the electroslag remelting ultra-clean steel adopts the following specific process.
And electroslag smelting NS333. The specific process comprises the following steps: specification of ingot-pulling crystallizer: phi 400 x 850mm; consumable electrode specification: phi 300X 2800mm; the alloy comprises the following components: 0.04% of C, 0.4% of Si, 0.4% of Mn, 0.008% of P, 0.005% of S, 15% of Cr, 16% of Mo, 2.5% of Co, 4% of W, 5% of Fe, 0.2% of V, and the balance of Ni and inevitable impurities; slag component (wt): 60% CaF 2 、25%CaO、10%Al 2 O 3 5% of MgO; slag amount: 50kg. 4 air blowing holes with the inner diameter of 0.15mm are uniformly distributed on the plane of the middle part of the crystallizer; the smelting process comprises the following steps:
(1) Polishing, brightening and welding the consumable electrode;
(2) Placing the slag charge in a heating furnace at 650 ℃ for baking for 10h;
(3) Paving solid slag arc striking agent, installing electrodes and introducing helium into the crystallizer;
(4) Starting power supply, adding slag, melting the slag for 45min, and heating to 1750 ℃;
(5) In the smelting stage, high-purity helium with the temperature of 250 ℃, the pressure of 0.07MPa, the water content of 0.35L/min and the water content of 0.00007vol% is blown into the slag layer when the slag layer overflows the gas blowing holes;
(6) Smelting until the position of the blowing hole is positioned at the middle lower part of the slag layer, and starting ingot drawing until the smelting is finished;
(7) Stopping blowing helium, and demoulding after 80 min.
(8) The crystallizer is used for smelting the electrodes with the same components and the same specifications by adopting the process, helium is not blown in the process, a comparative experiment is carried out, and comparative electroslag is obtained in production. The electroslag obtained in this example (electroslag in the method described below) and the comparative electroslag were examined, the size and quality of the molten drop in the slag layer are shown in table 7, and the contents of sulfur, phosphorus and non-metallic inclusions in the ingot are shown in table 8.
Table 7: size and number of electroslag remelting metal droplets
Figure DEST_PATH_IMAGE014
As shown in Table 7, the average grain size of the electroslag metal molten drops is 3.74mm, compared with the electroslag of 8.16mm, the electroslag is reduced by 54.2 percent, and the specific surface area under the same mass is increased by 118 percent; the residual amount of molten drops in the electroslag slag is 143.8g, and the comparative electroslag is 88.5g, which shows that the retention time is increased by 62.5 percent compared with the comparative electroslag.
Table 8: non-metallic inclusion and sulfur phosphorus content (wt) after electroslag smelting
Figure DEST_PATH_IMAGE016
As can be seen from Table 8, the total amount, rating and S content of the electroslag inclusion in the method are all lower than those of the comparative electroslag. Wherein, the total amount of the inclusions is less than 63.0 percent of the comparative electroslag, and the sulfur content is less than 66.7 percent of the comparative electroslag.
From the 4 embodiments, the larger the section is, the greater the advantages of the method are, and the sulfur and inclusion content of the crystallizer with the diameter of 300mm or more is reduced by more than 60% compared with the traditional electroslag, so that the method has wide application value.

Claims (5)

1. A smelting method of electroslag remelting ultra-clean steel is characterized by comprising the following steps: adopting a stripping crystallizer to carry out electroslag smelting; in the smelting process, 0.1-0.5L/min of high-purity gas which does not participate in the reaction is blown into the slag pool at the positions evenly distributed in a circle at the middle lower part of the slag pool.
2. The method for smelting electroslag remelting ultra-clean steel according to claim 1, characterized by comprising the following steps: the high-purity gas is horizontally blown into the slag pool.
3. The method for smelting electroslag remelting ultra-clean steel according to claim 1, characterized in that: and the high-purity gas is symmetrically blown in from two sides of the middle lower part of the slag pool.
4. The method for smelting electroslag remelting ultra-clean steel according to claim 1, characterized in that: the high-purity gas is high-purity helium.
5. A process for smelting electroslag remelting ultra clean steel according to any one of claims 1 to 4, wherein: the temperature of the high-purity gas is 200-300 ℃, and the pressure is 0.06-0.08 MPa.
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CN116607015A (en) * 2023-04-11 2023-08-18 宝立合金有限公司 Slag pool dynamic balancing method in electroslag smelting process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116607015A (en) * 2023-04-11 2023-08-18 宝立合金有限公司 Slag pool dynamic balancing method in electroslag smelting process

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