CN115710613B - Control method for low inclusion of silicon killed steel - Google Patents
Control method for low inclusion of silicon killed steel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 32
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 16
- 239000010703 silicon Substances 0.000 title claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 124
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 238000007664 blowing Methods 0.000 claims abstract description 43
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 27
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 27
- 239000004571 lime Substances 0.000 claims abstract description 27
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 24
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 24
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 6
- 230000023556 desulfurization Effects 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 70
- 229910052786 argon Inorganic materials 0.000 claims description 35
- 238000003756 stirring Methods 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000011593 sulfur Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000010436 fluorite Substances 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000011009 performance qualification Methods 0.000 description 1
- 230000008855 peristalsis Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a control method for low inclusion of silicon killed steel, which is implemented according to the following steps: step 1, slag washing in the tapping process of a converter, and adding lime and premelting slag; step 2, ladle opening is carried out to a treatment position of the LF refining furnace, and aluminum particles are uniformly scattered on the slag surface for pre-deoxidation; step 3, lime is added for slagging; step 4, adding calcium carbide to deoxidize slag; step 5, deep desulfurization of molten steel, and removal of large-size silicate nonmetallic inclusions; and 6, creeping the slag surface, and removing silicate nonmetallic inclusions with the size of 10-50 mu m by adopting a soft blowing mode to obtain the low-inclusion silicon killed steel. The control method for the low inclusion of the silicon killed steel is stable and reliable, has outstanding capability of removing nonmetallic inclusion in the steel on the basis of greatly improving the deoxidizing effect, and has low production cost and high production efficiency, thereby meeting the production process requirements.
Description
Technical Field
The invention belongs to the technical field of silicon-killed steel production, and particularly relates to a control method for low inclusion of silicon-killed steel.
Background
According to the different processing performance and application fields of products, the traditional steelmaking deoxidization modes are roughly divided into aluminum-killed steel and silicon-killed steel. The aluminum killed steel refers to steel with acid-soluble aluminum content of more than 0.01 percent, adopts a deoxidization mode mainly comprising aluminum alloy, and has strong deoxidization capability but higher deoxidization cost; the silicon killed steel is characterized in that the content of acid-soluble aluminum in the steel is less than 0.01%, and a deoxidization mode of Si+Mn is adopted, so that the deoxidization cost is low, but the deoxidization is incomplete, thereby causing a large number of nonmetallic inclusions and larger size, and seriously affecting the processability of the product and the expansion of the application field.
The existing silicon killed steel production process has the defects that: (1) CaO-CaF is commonly adopted 2 In the refining slag system, as lime (CaO component) increases and as slag basicity increases, fluorite (CaF) is used 2 The components) can relieve the fluidity of the slag in a short time to reduce the melting point of the slag, and the dynamic conditions are improved by increasing the bottom argon blowing flow of the steel ladle; over time, slag fluidity became worse, and fluorite (CaF 2 Component) further eases slag fluidity but does not adjust alkalinity (CaO/SiO) 2 )；(2)CaF 2 The usage amount of the components is continuously increased, the furnace lining is chemically corroded, the poor submerged arc effect can generate thermal shock and mechanical flushing on ladle slag line bricks, and the service life of the ladle is shortened; under the submerged arc effect, caF 2 Component and SiO 2 Component reaction to generate SiF 4 Toxic gas and environmental pollution; (3) The slag quantity of the converter is large, and the silicon iron powder is used for deoxidization to produce SiO 2 The component is higher than 20 percent, resulting in slag alkalinity (CaO/SiO) 2 ) Less than 2.8, and the slag is not added with aluminum alloy to cause Al 2 O 3 The content is less than 5%, and the Mannesmann index (CaO/SiO) 2 /Al 2 O 3 ) More than 0.6, resulting in further deterioration of slag fluidity and poor deoxidation of molten steel; (4) The prior art adopts ferrosilicon powder and calcium carbide for composite deoxidation, which is easy to produce silicate nonmetallic inclusion, thereby further causing 5 times/batch of material fracture frequency in the processing process of the terminal customer, reducing the production efficiency of the terminal customer, increasing the cost and increasing the economic loss of iron and steel enterprises.
Disclosure of Invention
The invention aims to provide a control method for low inclusion of silicon-killed steel, which solves the problems of weakening of deoxidization capability and inclusion adsorption capability of slag, reduced production efficiency and high cost caused by poor slag fluidity and poor dynamic conditions when silicon-killed steel is produced under the prior art.
The technical scheme adopted by the invention is that the control method for the low inclusion of the silicon-killed steel is implemented according to the following steps:
step 1, slag washing in the tapping process of a converter, and adding lime and premelting slag;
step 2, ladle opening is carried out to a treatment position of the LF refining furnace, and aluminum particles are uniformly scattered on the slag surface for pre-deoxidation;
step 3, lime is added for slagging;
step 4, adding calcium carbide to deoxidize slag;
step 5, deep desulfurization of molten steel, and removal of large-size silicate nonmetallic inclusions;
and 6, creeping the slag surface, and removing silicate nonmetallic inclusions with the size of 10-50 mu m by adopting a soft blowing mode to obtain the low-inclusion silicon killed steel.
The present invention is also characterized in that,
in the step 1, the lime input amount of ton steel is 2.0-2.5kg, and the pre-slag input amount of ton steel is 1.0-1.5kg.
In the step 2, the input amount of aluminum particles per ton of steel is 0.3-0.6kg, after 3-5min, the flow rate of bottom blowing argon is 300-600NL/min, stirring is carried out for 1-3min, and when aluminum particles are completely oxidized, al in slag is caused 2 O 3 The content of the components is not less than 8%;
in the step 3, the lime input amount of ton steel is 3.0-4.0kg, and the flow rate of bottom blowing argon is 200-400 NL/min.
In the step 4, the calcium carbide follows a few-batch multi-batch input mode, the input amount of the calcium carbide per ton steel is 0.4-0.8kg, and SiO in the slag is 2 The component content is 17-20%, and Mannesmann index MI is stabilized at 0.25-0.30.
In the step 5, the electrode is heated to meet the liquidus temperature, the good thermodynamic condition of 60-80 ℃ is improved, the dynamic condition of bottom blowing argon flow of 400-800NL/min is subjected to strong stirring for 3-5min, the large-size silicate nonmetallic inclusion exceeding 50 mu m is removed, and the endpoint sulfur content is ensured to be less than or equal to 0.010%;
and 6, when silicate nonmetallic inclusions with the size of 10-50 mu m are removed, the flow rate of bottom blowing argon is 50-150NL/min.
The beneficial effects of the invention are that the control method of low inclusion of silicon-killed steel reduces SiO in refining slag system 2 Component, improve Al 2 O 3 The constituent elements, mannesmann index MI, is stabilized at 0.25-0.30, thereby ensuringTFe in the slag is less than 1%; on the basis of greatly improving the deoxidizing effect, the capability of removing nonmetallic inclusion in steel is outstanding; aluminum particles are used for replacing fluorite and ferrosilicon powder to carry out deoxidization and slagging, the cost per ton of steel in the comprehensive process is reduced by more than or equal to 5 yuan, and the cost advantage is obvious; the material breaking frequency in the customer processing process is reduced from 5 times/batch to 0 times/batch, and the product terminal application is stable.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a control method for low inclusion of silicon killed steel, which is implemented according to the following steps:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.0-2.5kg, and the pre-slag input amount of ton steel is 1.0-1.5kg; in the step 1, lime forms slag in advance for slag forming materials which are input in the earlier stage; increasing CaO component of slag and increasing alkalinity of slag; the premelting slag replaces fluorite to improve the slag melting rate and increase Al in slag 2 O 3 And the component improves the fluidity of slag.
Step 2, opening the ladle to a treatment position of the LF refining furnace, uniformly scattering aluminum particles on the slag surface for pre-deoxidization, wherein the input amount of ton steel is 0.3-0.6kg, after 3-5min, the flow rate of bottom blowing argon is 300-600NL/min, and stirring for 1-3min to ensure that Al in the slag is realized 2 O 3 The content of the components is not less than 8%; the aluminum particles are pre-deallocated with oxygen in the slag, and when the aluminum particles are completely oxidized, al in the slag is increased 2 O 3 And (3) a component.
Step 3, lime is added for slagging, the lime input amount of ton steel is 3.0-4.0kg, and the interface reaction rate of the steel slag is improved under the dynamic condition that the argon flow rate of bottom blowing is 200-400 NL/min; lime is used for making slag, caO component of slag is increased, the alkalinity of slag is increased, the slag has a certain thickness, and molten steel is prevented from being sucked in the oxidation and smelting processes.
Step 4, adding calcium carbide to deoxidize slag, wherein the calcium carbide follows a small-batch multi-batch adding mode, the adding amount of calcium carbide per ton steel is 0.4-0.8kg, and SiO (silicon dioxide) in the slag 2 The component content is 17-20%, and the Mannesmann index MI is stabilized at 0.25-0.30, so that the slag has extremely strong deoxidizing capability and inclusion adsorption capability; calcium carbide is used as a foaming agent to foam slag, and the main component is CaC 2 The Fe of the slag FeO is reduced to produce CO gas, which further foams the slag.
Step 5, deep desulfurization of molten steel, and removal of large-size silicate nonmetallic inclusions; heating the electrode to meet the requirement of improving a good thermodynamic condition of 60-80 ℃ on the basis of liquidus temperature, and carrying out strong stirring for 3-5min under the kinetic condition of bottom blowing argon flow of 400-800NL/min to remove silicate nonmetallic inclusions with the size of more than 50 mu m and ensure that the end point sulfur content is less than or equal to 0.010%;
and 6, performing slag surface creeping, removing silicate nonmetallic inclusions with the size of 10-50 mu m by adopting a soft blowing mode not less than 10min, and performing bottom blowing on argon with the flow of 50-150NL/min to obtain the low-inclusion silicon killed steel.
The method for controlling the low inclusion of the silicon killed steel provided by the invention has the advantages that slag washing in the tapping process in the step 1 can be performed in advance, slag formation can be performed, and thus the slag fluidity can be improved. In the step 2, aluminum particles are added to pre-remove oxygen in the slag, so that Al in the slag is further increased 2 O 3 And the components provide favorable conditions for the yellow and white slag. In the step 3, lime is added for slag formation, and a larger argon blowing flow is needed to improve the interface reaction rate of the steel slag, so that favorable conditions are provided for white slag formation. And 4, adding calcium carbide to deoxidize slag, so as to produce white slag with extremely strong deoxidizing capacity and inclusion adsorption capacity, and laying a solid foundation for deep desulfurization of molten steel. And 5, carrying out molten steel deep desulfurization and removal of large-size silicate nonmetallic inclusions by utilizing good thermodynamic conditions and dynamic conditions. In the step 6, the creeping of the slag surface reduces the secondary oxidization of molten steel; the smaller the bottom blowing argon flow, the stronger the capability of carrying small-sized silicate nonmetallic inclusions.
Example 1
In this example 1, when the H08A steel material is used to prepare the silicon-killed steel, the following steps are specifically performed:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.2kg, and the fluorite input amount of ton steel is 0.9kg;
step 2, ladle opening is carried out to an LF refining furnace treatment position, the lime input amount of ton steel is 3.6kg, and the bottom blowing argon flow is 260NL/min;
step 3, the calcium carbide input amount per ton of steel is 0.5kg, and the ferrosilicon powder per ton of steel isThe input amount is 0.4kg, so that SiO in the slag is caused 2 A constituent of 22.36% resulting in a Mannesmann index MI of 0.62;
step 4, carrying out strong stirring for 3min under the dynamic condition of 700NL/min of bottom blowing argon flow on the basis of thermodynamic condition of 1592 ℃ of electrode heating, wherein the end point sulfur content is 0.015%;
and 5, in a soft blowing mode of peristalsis of the slag surface, the flow rate of bottom blowing argon is 120NL/min.
In the LF furnace in the embodiment 1, the slag is subjected to diffusion deoxidation by means of calcium carbide to form high-alkalinity slag, argon stirring is utilized to accelerate the interface reaction of the slag, and meanwhile, the electrode heats the high-alkalinity slag to form high-alkalinity white slag, so that the purpose of reducing oxygen and sulfur in steel is achieved. In this example 1, the fluidity of the slag was poor and the dynamic conditions were poor, resulting in a weakening of the deoxidizing ability and the adsorption inclusion ability of the slag.
Example 2
The method for carrying out low inclusion of silicon-killed steel by adopting H08A steel in the embodiment 2 is specifically carried out according to the following steps:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.3kg, and the pre-slag input amount of ton steel is 1.2kg;
step 2, ladle is opened to a treatment position of the LF refining furnace, aluminum particles are evenly added to the slag surface for pre-deoxidation, the adding amount of ton steel is 0.3kg, after 4min, argon gas flow is 380NL/min through bottom blowing, stirring is carried out for 2min, and Al in slag is caused 2 O 3 The component content is 9.9%;
step 3, the lime input amount of ton steel is 3.5kg, and the interface reaction rate of steel slag is improved under the dynamic condition of bottom blowing argon flow of 230 NL/min;
step 4, the calcium carbide input amount of ton steel is 0.7kg, and SiO in slag 2 The Mannesmann index is 19.82 percent and is stabilized at 0.29, so that the slag has extremely strong deoxidizing capability and inclusion adsorption capability;
step 5, on the basis of heating an electrode to meet the thermodynamic condition of 1595 ℃, carrying out strong stirring for 4min under the kinetic condition of 550NL/min of bottom blowing argon flow, removing silicate nonmetallic inclusions with the size of more than 50 mu m, and ensuring the end point sulfur content to be 0.008%;
and 6, removing silicate nonmetallic inclusions with the size of 10-50 mu m in a soft blowing mode of slag surface creeping, and blowing argon at the bottom flow rate of 80NL/min.
Example 3
This example 3, a method for silicon killed steel low inclusion using HDD300 steel, was specifically performed as follows:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.4kg, and the pre-slag input amount of ton steel is 1.3kg;
step 2, ladle is opened to a treatment position of the LF refining furnace, aluminum particles are evenly added to the slag surface for pre-deoxidation, the adding amount of ton steel is 0.4kg, after 3min, the slag is stirred for 1min at the flow rate of 450NL/min of bottom blowing argon, so that Al in the slag is caused 2 O 3 The component content is 10.2%;
step 3, the lime input amount of ton steel is 3.8kg, and the interface reaction rate of the steel slag is improved through the dynamic condition of bottom blowing argon flow of 300 NL/min;
step 4, calcium carbide follows a small-batch multi-batch input mode, the input amount of the calcium carbide per ton steel is 0.6kg, and SiO in slag is the same 2 The Mannesmann index MI is 19.21 percent and is stabilized at 0.30, so that the slag has extremely strong deoxidizing capability and inclusion adsorption capability;
step 5, on the basis of heating an electrode to meet the thermodynamic condition of 1588 ℃, carrying out strong stirring for 5min under the kinetic condition of 600NL/min of bottom blowing argon flow, removing silicate nonmetallic inclusions with the size of more than 50 mu m, and ensuring the end point sulfur content to be 0.006%;
and 6, removing silicate nonmetallic inclusions with the size of 10-50 mu m in a soft blowing mode of slag surface creeping, and blowing argon at the bottom flow rate of 50NL/min.
Example 4
The method for carrying out low inclusion of silicon killed steel by adopting 30MnSi steel in the embodiment 4 is specifically carried out according to the following steps:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.5kg, and the pre-slag input amount of ton steel is 1.0kg;
step 2, ladle is opened to a treatment position of the LF refining furnace, aluminum particles are evenly added to the slag surface for pre-deoxidation, the adding amount of ton steel is 0.6kg, after 5min, the slag is stirred for 1min at the bottom blowing argon flow rate of 300NL/min, so that Al in the slag is caused 2 O 3 The component content is 11.9%;
step 3, the lime input amount of ton steel is 3.0kg, and the interface reaction rate of the steel slag is improved through the dynamic condition of bottom blowing argon flow of 400 NL/min;
step 4, calcium carbide follows a small-batch multi-batch input mode, the input amount of the calcium carbide per ton steel is 0.8kg, and SiO in slag is the same as that of the calcium carbide per ton steel 2 18.03%, and the Mannesmann index MI is stabilized at 0.26, so that the slag has extremely strong deoxidizing capability and inclusion adsorption capability;
step 5, on the basis of heating an electrode to meet thermodynamic conditions of 1579 ℃, carrying out strong stirring for 4min under the kinetic conditions of bottom blowing argon flow of 400NL/min, removing silicate nonmetallic inclusions with the size of more than 50 mu m, and ensuring that the end point sulfur content is 0.009%;
and 6, removing silicate nonmetallic inclusions with the size of 10-50 mu m in a soft blowing mode of slag surface creeping, and blowing argon at the bottom flow rate of 100NL/min.
Example 5
This example 5, a method for low inclusion in silicon killed steel using Q195 steel, was specifically performed as follows:
step 1, slag washing is carried out in the tapping process of a converter, the lime input amount of ton steel is 2.0kg, and the pre-slag input amount of ton steel is 1.5kg;
step 2, ladle is opened to a treatment position of the LF refining furnace, aluminum particles are evenly added to the slag surface for pre-deoxidation, the adding amount of ton steel is 0.4kg, after 4min, the slag is stirred for 1min at the flow rate of 450NL/min of bottom blowing argon, so that Al in the slag is caused 2 O 3 The component content is 11.3%;
step 3, the lime input amount of ton steel is 4.0kg, and the interface reaction rate of the steel slag is improved under the dynamic condition of 200NL/min of bottom blowing argon flow;
step 4, calcium carbide follows a small-batch multi-batch input mode, the input amount of the calcium carbide per ton steel is 0.4kg, and SiO in slag is the same as that of the calcium carbide per ton steel 2 The Mannesmann index MI is 19.98 percent and is stabilized at 0.27, so that the slag has extremely strong deoxidizing capability and inclusion adsorption capability;
step 5, on the basis of heating an electrode to meet the thermodynamic condition of 1602 ℃, carrying out strong stirring for 4min under the kinetic condition of 800NL/min of bottom blowing argon flow, removing silicate nonmetallic inclusions with the size of more than 50 mu m, and ensuring the end point sulfur content to be 0.010%;
and 6, removing silicate nonmetallic inclusions with the size of 10-50 mu m in a soft blowing mode of slag surface creeping, and blowing argon at the bottom flow rate of 150NL/min.
The results of the final slag components of the above five groups of examples are shown in table 1:
TABLE 1 comparison of results of the final slag components
| Project | TFe％ | SiO 2 ％ | CaO％ | MnO | Al 2 O 3 ％ | R | MI |
| Example 1 | 2.78 | 22.33 | 59.55 | 0.2 | 4.32 | 2.67 | 0.62 |
| Example 2 | 0.83 | 19.82 | 56.31 | 0.1 | 9.9 | 2.84 | 0.29 |
| Example 3 | 0.75 | 19.21 | 58.73 | 0.1 | 10.2 | 3.06 | 0.30 |
| Example 4 | 0.93 | 18.03 | 56.27 | 0.2 | 11.9 | 3.12 | 0.26 |
| Example 5 | 0.39 | 18.98 | 56.91 | 0.1 | 11.3 | 3.00 | 0.27 |
By passing throughThe final slag composition comparison, the reducibility, flowability and deoxidizing ability of the final slag of examples 2-5 are all better than that of example 1. Examples 2 to 5, final slag basicity (CaO/SiO) 2 ) Between 2.84 and 3.12, the lower the TFe content, the more thorough the deoxidation; preferably, the Mannesmann index MI is stabilized at 0.25-0.30.
The comparison of the process costs for the above five examples is shown in table 2:
table 2 shows the comparison of the process costs for five examples
As is evident from Table 2, the costs per ton of steel for examples 2-5 are reduced by 5.3-8.7 yuan compared to example 1.
The control method for the low inclusion content of the silicon-killed steel has simple process control, effectively removes the inclusions in the production process, reduces the number of the inclusions and the proportion of large-particle inclusions in the silicon-killed steel, has low inclusion removal cost, and is stable and reliable, thereby effectively improving the performance qualification rate of the silicon-killed steel and prolonging the service life.
Claims (3)
1. The control method for the low inclusion of the silicon killed steel is characterized by comprising the following steps:
step 1, slag washing in the tapping process of a converter, and adding lime and premelting slag;
step 2, ladle opening is carried out to a treatment position of the LF refining furnace, and aluminum particles are uniformly scattered on the slag surface for pre-deoxidation;
step 3, lime is added for slagging;
step 4, adding calcium carbide to deoxidize slag;
step 5, deep desulfurization of molten steel, and removal of large-size silicate nonmetallic inclusions;
step 6, creeping the slag surface, adopting a soft blowing mode to remove silicate nonmetallic inclusions with the size of 10-50 mu m, and obtaining the low-inclusion silicon-killed steel;
in the step 1, the lime input amount of ton steel is 2.0-2.5kg, and the pre-slag input amount of ton steel is 1.0-1.5kg;
in the step 2, the input amount of aluminum particles per ton of steel is 0.3-0.6kg, after 3-5min, the flow of bottom blowing argon is 300-600NL/min, stirring is carried out for 1-3min, and when the aluminum particles are completely oxidized, al in the slag is caused 2 O 3 The content of the components is not less than 8%;
in the step 5, the electrode is heated to meet the liquidus temperature, the good thermodynamic condition of 60-80 ℃ is improved, the dynamic condition of bottom blowing argon flow of 400-800NL/min is subjected to strong stirring for 3-5min, silicate nonmetallic inclusions with the size of more than 50 mu m are removed, and the endpoint sulfur content is ensured to be less than or equal to 0.010%;
and (3) when the silicate nonmetallic inclusions with the size of 10-50 mu m are removed in the step (6), the flow rate of bottom blowing argon is 50-150NL/min.
2. The method for controlling low inclusion of silicon killed steel according to claim 1, wherein the lime input amount of ton steel in the step 3 is 3.0-4.0kg, and the dynamic condition of bottom blowing argon flow is 200-400 NL/min.
3. The method for controlling low inclusion of silicon-killed steel according to claim 1, wherein the calcium carbide in the step 4 follows a few-batch multi-batch input method, the input amount of calcium carbide per ton of steel is 0.4-0.8kg, and SiO in slag is 2 The Mannesmann index MI is 17-20%, and is stabilized at 0.25-0.30.
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