CN107177718B - Novel low-carbon low-silicon steel refining slag - Google Patents

Novel low-carbon low-silicon steel refining slag Download PDF

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CN107177718B
CN107177718B CN201710234978.8A CN201710234978A CN107177718B CN 107177718 B CN107177718 B CN 107177718B CN 201710234978 A CN201710234978 A CN 201710234978A CN 107177718 B CN107177718 B CN 107177718B
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steel
slag
argon
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CN107177718A (en
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蒲锐
孙作迎
周永志
齐士兵
王岩
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Rizhao Steel Holding Group Co Ltd
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    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • 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
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses novel low-carbon low-silicon steel refining slag, which comprises the following raw materials of lime, aluminum particles, fluorite, calcium carbide and magnesium carbonate; the refining slag comprises the following chemical components: TFe: 0.45% -0.56% of SiO2：4.51%~4.52%、CaO：50.12%~54.15%、MgO：9.32%~11.19%、Al2O3：35.6%~36.1%、MnO：0.12%~0.14%、TiO2：0.13%~0.15%、S：0.32%~0.46%、P2O5: 0.015-0.019 percent, and the balance of inevitable impurities. Compared with the prior art, the method has the advantages of low cost and stable product quality.

Description

Novel low-carbon low-silicon steel refining slag
Technical Field
The invention relates to the field of steel smelting, in particular to novel low-carbon low-silicon steel refining slag.
Background
The tin-plated thin plate is also called tinplate, is a tin-plated steel product with a substrate of a low-carbon low-silicon steel plate and a steel strip, and is widely applied to industries such as can making, packaging materials, stamping containers and the like. The chemical composition, the grain size, the precipitation of solid-solution carbon and nitrogen and the flatness of the tinplate base plate are main factors influencing the hardness, the crease resistance and the like of the tinplate base plate; the tinplate (RGMR 2) substrate is low-silicon low-carbon steel, and has chemical composition with carbon content below 0.04% and silicon content below 0.03%, inclusion content below 0.04/m 2 and grain size below 20 μm. The refining slag in the refining process is a main method for improving the cleanliness of molten steel and reducing the content of impurities in the steel. The refining slag plays roles of heat preservation, deoxidation, desulphurization, absorption of impurities in steel, impurity denaturation and the like in the refining process. Therefore, the selection of a proper refining slag system and refining slag according to different steel grades is very important, the component proportion of the refining slag is referred to the refining slag system to play a vital role in controlling the inclusion in the steel, the refining process is directly related to the control level of a refining process for controlling the refining slag system, and the adjustment of the refining slag system mainly depends on the component control of the refining slag and the inclusion in the smelting steel.
At present, when a tinplate base plate is refined by LF, the chemical components of refining slag are mostly TFe1.44 percent and SiO25.34%、CaO57.68%、MgO 5.03%、Al2O326.3%、MnO 0.18%、TiO20.21%、S 0.59%、P2O50.018%; alkalinity R: 10.80, the slagging raw materials mostly use lime, calcium carbide and fluorite, and the dosage is 9kg/t, 1.9kg/t and 2.9kg/t respectively. The refining slag in the prior art has high TFe content, low molten steel yield, strong slag oxidability, insufficient deoxidation, unfavorable impurity adsorption and CaO/Al in the slag2O3High value, unfavorable for Al2O3Adsorption of impurities, if Al is simply increased2O3The content of the SiO causes the slag fluidity to be sharply increased, so that the SiO2+Al→Si+Al2O3The reaction is obviously accelerated, and the Si increase in steel is serious, so that the method cannot be applied to low-carbon low-silicon steel. Meanwhile, the MgO content is low, the molten steel seriously erodes the steel ladle refractory, so that when the steel grade of the tinplate base plate is produced, the total oxygen content is increased, the steel grade inclusion exceeds the standard, and the viscosity of the slag can be improved by simply increasing the MgO, so that the fluidity of the slag is reduced, the floating of the inclusion is not facilitated, and the MgO-containing slag can not be applied to low-carbon low-silicon steel. Meanwhile, the consumption of calcium carbide is large, so that the C increase in the refining process reaches 0.018%, the converter is forced to reduce the end C content, the blowing loss of the steel converter is increased, and the production cost is increased. The existing problems seriously affect the product percent of pass and cause economic loss of enterprises. Therefore, the refining slag needs to be optimized for producing the tinplate iron-based plate steel urgently.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides the novel low-carbon low-silicon steel refining slag, which reduces the oxidability of the refining slag, improves the fluidity, reduces the increase of Si in the refining process, improves the impurity adsorption capacity of the refining slag and reduces the recarburization in the low-carbon steel refining process by improving the components of the refining slag.
The addition amount of the raw materials per ton of steel is as follows: 8.5-9.5 kg of lime; aluminum particles: 1.2-1.5 kg; fluorite: 0.7-0.9 kg; 0-0.3 kg of calcium carbide; 1.3-1.5 kg of magnesium carbonate;
the refining slag comprises the following chemical components: TFe: 0.45% -0.56% of SiO2：4.51%~4.52%、CaO：50.12%~54.15%、MgO：9.32%~11.19%、Al2O3：35.6%~36.1%、MnO：0.12%~0.14%、TiO2：0.13%~0.15%、S：0.32%~0.46%、P2O5: 0.015-0.019 percent, and the balance of inevitable impurities.
Compared with the prior refining slag, the refining slag of the invention comprises the following components:
1. adding aluminum particles in sections, firstly stirring 0.4-0.5 kg/t aluminum particles in an argon station for 4-6min, pre-deoxidizing the ladle slag, adding the rest aluminum particles in LF refining, deeply deoxidizing the refining slag, adding the aluminum particles in sections, and being beneficial to improving the Al content in the slag at the early stage of refining2O3The content of the calcium carbide is beneficial to rapid deoxidation and slagging in the early stage of refining to form a liquid slag layer, so that molten steel and air are isolated, oxygen absorption and nitrogen absorption of the molten steel are reduced, and the use amount of the calcium carbide and the fluorite is reduced; making Al in refining slag2O3The proportion is increased to 30-35%, and CaO/Al is controlled2O31.4-1.5, deoxidizing product Al in slag2O3Belongs to non-surface active substances, and can generate 13CaO 7Al with low melting point with CaO2O3Compound, increase Al in slag2O3Content of Al increases slag fluidity and decreases Al2O3Activity of (1) and thus facilitates the discharge of inclusions in the steel, but Al has traditionally been simply increased2O3The content can cause the slag fluidity to be sharply increased, so that SiO2+Al→Si+Al2O3The reaction is obviously accelerated, and the Si increase in steel is serious, so that the method cannot be applied to low-carbon low-silicon steel;
2. using a portion of MgCO3As foaming agent, surfactant, instead of part of CaC2The MgO content in the slag is improved to 9-10%, the corrosion of the slag on a steel ladle is reduced, and SiO is reduced2Activity, reduces carburetion in the refining process, MgO is the main component of steel ladle refractory, improves MgO in slag, reduces corrosion of refining slag to steel ladle wall refractory, thereby being beneficial to improving the purity of molten steel, and MgO is a surface active substanceThe high-melting-point high-viscosity slag has high melting point, and the simple increase of MgO can improve the viscosity of the slag, thereby reducing the fluidity of the slag and being not beneficial to the floating of impurities, so the high-viscosity slag cannot be applied to low-carbon low-silicon steel, and researches show that the mass ratio of Al can be controlled2O3the/MgO is 3.2-3.8, and the effect is optimal;
3. CaO-Al is formed in molten steel2O3-MgO slag effective in reducing the increase of Al2O3The slag fluidity is improved sharply, the influence of MgO improvement on the slag fluidity is reduced while the contradiction of Si increase of the molten steel is caused, so that the optimal inclusion adsorption capacity of the refining slag is achieved, the Si increase and the carbon increase C in the refining process are reduced, the adsorption of the refining slag on refractory materials is reduced, the purity of the molten steel is improved, and the requirement of the galvanized iron-based plate steel is met.
Detailed Description
The low-carbon low-silicon steel refining slag of the invention is further explained in detail by combining the specific examples below:
control group of prior art:
the adding amount of raw material per ton of steel is as follows: 9kg of lime; 0.4kg of aluminum particles; 2.9kg of fluorite; 1.9kg of calcium carbide.
The refining slag comprises the following chemical components: TFe: 1.44% SiO2：5.34%、CaO：57.68%、MgO：5.03%、Al2O3：26.3%、MnO：0.18%、TiO2：0.21%、 S：0.59%、P2O5: 0.018% and the balance unavoidable impurities; alkalinity R: 10.8.
the refining and slagging process comprises the following steps:
(1) refining and deoxidizing, and slagging:
sampling, argon blowing and stirring after the molten steel reaches LF, wherein the argon flow is 300-;
(2) stirring and desulfurizing:
heating the molten steel to 1590-;
(3) calcium treatment:
regulating the flow rate of bottom blowing argon to 150-;
(4) soft blowing:
and after the wire feeding, regulating the bottom blowing flow to 50-100m for carrying out topdressing/h, and taking out after argon blowing for 10-15 min.
Example 1
The adding amount of raw material per ton of steel is as follows: 9kg of lime; 1.2kg of aluminum particles; 0.9kg of fluorite; 0.3kg of calcium carbide; magnesium carbonate 1.3 kg.
The chemical components of the refining slag are as follows: TFe: 0.56% SiO2：4.52%、CaO：53.06%、MgO：9.32%、Al2O3：35.6%、MnO：0.13%、TiO2：0.13%、S：0.46%、P2O5: 0.019 percent, and the balance of inevitable impurities; alkalinity R: 11.74.
the refining and slagging process comprises the following steps:
(1) pre-melting ladle slag:
in the converter tapping process, when 1/3 steel is tapped, 3kg/t lime and 0.6kg/t fluorite are added into a steel ladle, the melting temperature of steel ladle slag is reduced, and the steel ladle slag is prevented from crusting;
(2) pre-deoxidizing in a ladle slag argon station:
after the tapping of the converter is finished, after molten steel enters an argon station, uniformly scattering 0.4kg/t aluminum particles on the slag surface of the steel ladle, stirring for 4-6min, and carrying out 600 m cultivation at the bottom argon blowing flow rate of the steel ladle in 400-;
(3) refining and deoxidizing, and slagging:
argon blowing and stirring are carried out after the liquid steel is sampled from LF, the argon flow is 300 and 500 m/h, lime 6kg/t, fluorite 0.3kg/t and MgCO are added after argon blowing is carried out for 3-5min31.3kg/t, reducing the flow of argon blowing at the bottom of the ladle to 150-;
(4) stirring and desulfurizing:
heating the molten steel to 1590-;
(5) calcium treatment:
regulating the flow rate of bottom blowing argon to 150-;
(6) soft blowing:
and after the wire feeding, regulating the bottom blowing flow to 50-100m for carrying out topdressing/h, and taking out after argon blowing for 10-15 min.
Example 2
The adding amount of raw material per ton of steel is as follows: 8.5kg of lime; aluminum particles: 1.35 kg; fluorite: 0.8 kg; 0.1kg of calcium carbide; magnesium carbonate 1.42 kg.
The obtained refining slag comprises the following chemical components: TFe: 0.51% SiO2：4.52%、CaO：50.12%、MgO：11.19%、Al2O3：35.8%、MnO：0.14%、TiO2：0.15%、S：0.42%、P2O5: 0.015%, and the balance unavoidable impurities, wherein the alkalinity R: 11.0.
the refining and slagging process comprises the following steps:
(1) pre-melting ladle slag:
in the converter tapping process, when 1/3 steel is tapped, 3kg/t lime and 0.6kg/t fluorite are added into a steel ladle, the melting temperature of steel ladle slag is reduced, and the steel ladle slag is prevented from crusting;
(2) pre-deoxidizing in a ladle slag argon station:
after the tapping of the converter is finished, after molten steel enters an argon station, uniformly scattering 0.45kg/t aluminum particles on the slag surface of the steel ladle, stirring for 4-6min, and carrying out 600 m cultivation at the bottom argon blowing flow rate of the steel ladle in 400-;
(3) refining and deoxidizing, and slagging:
argon blowing and stirring are carried out after the liquid steel is sampled from LF, the argon flow is 300 and 500 m/h, 5.5kg/t of lime, 0.2kg/t of fluorite and MgCO are added after argon blowing is carried out for 3-5min31.42kg/t, reducing the flow of argon blowing at the bottom of the ladle to 150-;
(4) stirring and desulfurizing:
heating the molten steel to 1590-;
(5) calcium treatment:
regulating the flow rate of bottom blowing argon to 150-;
(6) soft blowing:
and after the wire feeding, regulating the bottom blowing flow to 50-100m for carrying out topdressing/h, and taking out after argon blowing for 10-15 min.
Example 3
The adding amount of raw material per ton of steel is as follows: 9.5kg of lime; aluminum particles: 1.5 kg; fluorite: 0.7 kg; 0kg of calcium carbide; magnesium carbonate 1.5 kg.
The obtained refining slag comprises the following chemical components: TFe: 0.45% of SiO2：4.51%、CaO：54.15%、MgO：10.31%、Al2O3：36.1%、MnO：0.12%、TiO2：0.14%、S：0.32%、P2O5: 0.015 percent and the balance of inevitable impurities; alkalinity R: 12.
the refining and slagging process comprises the following steps:
(1) pre-melting ladle slag:
in the converter process, when 1/3 steel is tapped, 3kg/t lime and 0.6kg/t fluorite are added into a steel ladle, the melting temperature of steel ladle slag is reduced, and the steel ladle slag is prevented from crusting;
(2) pre-deoxidizing in a ladle slag argon station:
after the tapping of the converter is finished, after molten steel enters an argon station, uniformly scattering 0.5kg/t aluminum particles on the slag surface of the steel ladle, stirring for 5-7min, and carrying out 600 m cultivation at the bottom argon blowing flow rate of the steel ladle in 400-;
(3) refining and deoxidizing, and slagging:
argon blowing and stirring are carried out after the liquid steel is sampled from LF, the argon flow is 300 and 500 m/h, lime 6.5kg/t, fluorite 0.1kg/t and MgCO are added after argon blowing is carried out for 4-6min31.5kg/t, reducing the argon blowing flow at the bottom of the ladle to 150-;
(4) stirring and desulfurizing:
heating the molten steel to 1590-;
(5) calcium treatment:
regulating the flow rate of bottom blowing argon to 150-;
(6) soft blowing:
and after the wire feeding, regulating the bottom blowing flow to 50-100m for carrying out topdressing/h, and taking out after argon blowing for 10-15 min.
The low-carbon low-silicon steel contains a large amount of non-metal impurities due to low end-point carbon content of the converter, severe peroxidation of molten steel and aluminum deoxidation, and the non-metal impurities need to be removed in the LF refining process, so that the refining slag has good adsorption and inclusion capacity, and is required to have lower surface tension and good fluidity, and is beneficial to adsorption and discharge of the impurities. But the fluidity is too good, Si is easy to increase, the fluidity is poor, and the adsorption and inclusion capacity of the refining slag is limited. In the refining process, the molten steel contains high Al (0.020-0.040 percent) and SiO in slag2The following reactions occur: SiO 22+Al→Si+Al2O3The better the slag fluidity, the more likely this reaction will occur, whereas low carbon, low silicon steel requires less than 0.03% Si. Al (Al)2O3Belongs to non-surface active substances and can produce 13CaO 7AL with low melting point with CaO2O3Compound, increase Al in slag2O3Content of Al increases slag fluidity and improves Al2O3The activity of the steel is beneficial to discharging impurities in the steel, so that the total oxygen content in the steel is reduced; but Al is conventionally simply increased2O3The content can cause the slag fluidity to be sharply increased, so that SiO2+Al→Si+Al2O3The reaction is obviously accelerated, the increase of Si in steel is serious, and silicate is included, so that the method can not be applied to low-carbon low-silicon steel.
The main component of the calcium carbide is CaC2，CaC2The foaming agent, the deoxidizer and the desulfurizer play roles in the refining process and are the main reasons for increasing the C content in LF refining, and the addition amount of the foaming agent, the deoxidizer and the desulfurizer is reduced, so that the C content in steel in subsequent refining can be correspondingly reduced, and the cost is reduced.
Principal of fluoriteThe main component is CaF2，CaF2The method mainly plays a role in reducing the melting point of the calcium-series composite inclusions, destroying a compact desulfurization layer on the surface of CaO and reducing the viscosity of slag, but F element contained in the slag seriously erodes the lining of the steel ladle and seriously pollutes the environment. In the present invention, Al is added2O3By using a part of Al2O3To replace CaF2Good desulfurization effect is achieved, the amount of fluorite can be reduced, and the CaF is reduced2The negative effects of (c).
MgCO3Decomposition to produce CO during slag refining2And MgO, MgCO is added3The gas generation amount is increased, and the slag performance is adjusted, so that the slag has good foam storage capacity; MgO is a main component of steel ladle refractory, improves MgO in slag, reduces the corrosion of refining slag on the steel ladle wall refractory, is beneficial to improving the purity of molten steel, is a surface active substance, has a higher melting point, increases the viscosity of slag by simply improving MgO, reduces the fluidity of slag, is not beneficial to floating of inclusions, and cannot be applied to low-carbon low-silicon steel easily. Research shows that under the condition of controlling the alkalinity R to be 11-12, the mass ratio of Al to Al is2O3MgO of 3.2 to 3.8, CaO/Al2O3: between 1.4 and 1.5, CaO-Al is formed in the molten steel2O3-MgO slag effective in reducing the increase of Al2O3The slag fluidity is improved sharply, the influence of the improvement of the MgO content on the slag fluidity is reduced while the contradiction of the Si increase of the molten steel is caused, the best inclusion adsorption capacity of the refining slag is achieved, the Si and C increase in the refining process is reduced, and the adsorption of the refining slag on refractory materials is reduced, so that the purity of the molten steel is improved, and the requirement of the galvanized iron-based plate steel is met.
In conclusion, by improving the components and carrying out reasonable proportioning, the components are mutually coordinated and restricted in multiple aspects, ① the fluidity of the refining slag is improved, the refining slag is beneficial to adsorbing impurities in steel, the Si increase of molten steel is effectively inhibited, ② the CaO/Al is reduced at the same time2O3And Al in slag2O3Activity, reducing silicate inclusion in molten steel, ③ reducing calcium carbide consumption, further reducing C increase in steel in subsequent refining, ④ reducing fluoriteThe dosage is reduced, and the corrosion of slag to the ladle is reduced.
In the process steps, aluminum particles are added step by step, so that the refining slag and inclusions in the slag form a liquid slag layer in advance, molten steel and air are isolated, oxygen absorption and nitrogen absorption of the molten steel are reduced, heating time in the refining process is shortened, cleanliness of the molten steel is improved, accurate control of the components of the refined final slag is easy to realize, and product quality is improved.
Comparison of raw material composition and cost of steel refining slag of comparison group and examples 1-3 ton:
Figure 229901DEST_PATH_IMAGE002
as can be seen from the above table, each example had a lower cost than the control.
The results of the content detection of the control group and the molten steel samples in examples 1 to 3 are as follows:
Figure 678199DEST_PATH_IMAGE003
the above table shows that the nonmetal content, the size and the content of the inclusions in each embodiment meet the requirements of the steel for the tinplate base plate, the recarburization and the silicon increment in the refining process are obviously lower than those in the control group, the qualification rate reaches 100%, the judgment rate of the tinplate base plate is greatly reduced, the production cost is not increased, and the economic benefit of an enterprise is improved.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.

Claims (1)

1. A novel slagging method of low-carbon low-silicon steel refining slag is characterized by comprising the following steps: the adding amount of the raw material per ton of steel is 9kg of lime; aluminum particles: 1.2 kg; fluorite: 0.9 kg; 0.3kg of calcium carbide; 1.3kg of magnesium carbonate; the refining and slagging process comprises the following steps:
(1) pre-melting ladle slag: in the converter tapping process, when 1/3 steel is tapped, 3kg/t lime and 0.6kg/t fluorite are added into a steel ladle, the melting temperature of steel ladle slag is reduced, and the steel ladle slag is prevented from crusting;
(2) pre-deoxidizing in a ladle slag argon station: after tapping of the converter is finished, uniformly scattering 0.4kg/t of aluminum particles on the slag surface of the steel ladle after molten steel enters an argon station, stirring for 4-6min, and carrying out top-loading and bottom-blowing argon blowing on the steel ladle at a flow rate of 400-600 m;
(3) refining and deoxidizing, and slagging: argon blowing and stirring are carried out after the molten steel is sampled in an LF (ladle furnace), the argon flow is 300-500 m/h, lime 6kg/t, fluorite 0.3kg/t and MgCO are added after argon blowing is carried out for 3-5min31.3kg/t, reducing the argon blowing flow at the bottom of the steel ladle to 150-200m, transmitting power, heating up and slagging, and adding 0.8kg/t of aluminum particles and 0.3kg/t of calcium carbide in the power transmission process;
(4) stirring and desulfurizing: heating the molten steel to 1590-1610 ℃, increasing the flow of bottom-blown argon to 700-800 m/h, stirring strongly for 2-4min, sampling, testing, and desulfurizing the molten steel to less than 0.01%;
(5) calcium treatment: regulating the flow rate of bottom blowing argon to 150-200 m/h, feeding a metal calcium wire by using a wire feeding machine for 200-250m, controlling the wire feeding speed to be 2-2.5m/s, and preventing molten steel from turning over greatly during wire feeding;
(6) soft blowing: and after the wire feeding, regulating the bottom blowing flow to 50-100m for carrying out topdressing/h, and taking out after argon blowing for 10-15 min.
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