CN117758018A - Control method for titanium-containing ultra-low carbon steel inclusion - Google Patents
Control method for titanium-containing ultra-low carbon steel inclusion Download PDFInfo
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- CN117758018A CN117758018A CN202311640611.8A CN202311640611A CN117758018A CN 117758018 A CN117758018 A CN 117758018A CN 202311640611 A CN202311640611 A CN 202311640611A CN 117758018 A CN117758018 A CN 117758018A
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- 238000000034 method Methods 0.000 title claims abstract description 90
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000010936 titanium Substances 0.000 title claims abstract description 25
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 25
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 239000002893 slag Substances 0.000 claims abstract description 87
- 230000008569 process Effects 0.000 claims abstract description 69
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 21
- 238000005275 alloying Methods 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 229910000532 Deoxidized steel Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 32
- 238000007664 blowing Methods 0.000 claims description 20
- 229910052786 argon Inorganic materials 0.000 claims description 16
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 239000011449 brick Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 229910052902 vermiculite Inorganic materials 0.000 claims description 6
- 235000019354 vermiculite Nutrition 0.000 claims description 6
- 239000010455 vermiculite Substances 0.000 claims description 6
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 5
- 238000009489 vacuum treatment Methods 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000007670 refining Methods 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a control method of titanium-containing ultra-low carbon steel inclusions. The molten steel smelting process flow comprises the following steps: the converter process, the LF process, the RH process and the slab continuous casting process are carried out, low-reactivity slag is added after the aluminum deoxidization alloying in the RH process is finished, the slag floats upwards and stays to a steel-slag interface along with the circulation of vacuum molten steel, the ladle slag is prevented from transferring oxygen to the molten steel, and meanwhile, the substances have the capability of adsorbing impurities in the steel; and the RH working procedure treatment technological parameters are controlled, so that the ladle slag is effectively prevented from transferring oxygen to molten steel, the secondary oxidation of titanium and aluminum elements in the deoxidized steel is avoided, and the inclusion content in the steel is controlled. The control method effectively prevents ladle slag from transferring oxygen to molten steel, avoids secondary oxidation of easily oxidized elements such as titanium, aluminum and the like in the deoxidized steel, and has obvious economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of steel smelting-refining, and particularly relates to a control method of titanium-containing ultra-low carbon steel inclusions.
Background
As the RH treatment process of ultra-low carbon steel such as IF steel and the like needs to utilize the reaction of oxygen and carbon in the steel to lead [ C ] in the steel]The content is removed to 30 multiplied by 10 -6 The following is even lower. Therefore, the ultra-low carbon steel is not added or only added with a small amount of ladle slag modifier in the converter tapping and LF refining processes to deoxidize ladle slag, so that the ladle slag has higher oxidizing property. Usually, more than 8% of TFe in ladle slag is still left after RH decarburization is finished, and the TFe in domestic partial enterprises can reach about 5% and still be far higher than that of medium carbon or high carbon steel (TFe in deoxidized steel is generally less than 1%). The molten steel alloying process and the continuous casting process are finished after decarburization, and the slag transfers a large amount of oxygen into the steel, so that a large amount of burning loss of alloy elements such as titanium, aluminum and the like in the steel and the content of inclusions are greatly increased.
For a long time, metallurgical workers at home and abroad develop a great deal of research work on how to effectively reduce the oxidability of the ultra-low carbon steel ladle slag, and obtain the effect, and the TFe content of the ladle slag can only be about 5%, so that the secondary oxidation of the ladle slag to molten steel can not be avoided.
Patent CN116287566a discloses an ultra-low carbon steel top slag modification process, which reasonably controls the oxidizing property of the steel ladle top slag through staged modification, so that the oxidizing property of the top slag is utilized as a resource. And a great amount of instantaneous smoke dust can not be generated in the control process of the whole flow, and the environment-friendly modification is accurate. RH broken slag T.Fe less than or equal to 8%, caO/Al 2 O 3 In the range of 1.3 to 1.8.
Patent CN113528757a disclosesThe ladle refining slag comprises the following components in percentage by weight: siO (SiO) 2 ：6％～8.5％，Al 2 O 3 :23% -27.5%, caO:45% -51%, mgO:5 to 8 percent, and T (Fe+Mn) is less than or equal to 0.5 percent, wherein CaO/Al 2 O 3 Controlled within the range of 1.5 to 1.9. Reasonably controlling the alkalinity of refining slag and the content of aluminum oxide, caO/Al 2 O 3 The method is controlled within the range of 1.5-1.9, ensures the desulfurization effect, simultaneously gives consideration to the deoxidization capability of the slag system, and is favorable for the adsorption of inclusions.
Patent CN105821178A discloses a smelting method of ultra-low carbon steel, comprising: smelting molten iron through a converter, and adding high-calcium aluminum slag balls according to the oxygen content of the end point of the converter when tapping the converter to reduce the TFe content in top slag, so as to obtain molten steel; and refining the molten steel by RH vacuum, and uniformly scattering high-calcium aluminum slag balls on the slag surface when RH breaking is finished, so as to further reduce the TFe content in the slag, wherein after the technology is applied, the TFe content of the slag before RH finishing ladle hanging can be reduced to 3.4% -5.0%.
According to the prior art, a large amount of aluminum-containing modifier is added to deoxidize ladle slag in the refining process of titanium-containing ultra-low carbon steel such as automobile plates and the like at home and abroad. However, the oxidizing property of the ladle slag of the RH refining end cannot be reduced to the level of medium carbon or high carbon steel, and the ladle slag still transmits oxygen to molten steel in the continuous casting process, so that alloy elements such as titanium, aluminum and the like in the steel are burnt, and the problems of great increase of inclusion content in the steel and poor steel are caused.
Disclosure of Invention
The invention aims to provide a control method of titanium-containing ultra-low carbon steel inclusions, which is applied to high-quality titanium-containing ultra-low carbon steel such as automobile plates and the like and is used for stably controlling the inclusions in the steel.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a control method of titanium-containing ultra-low carbon steel inclusion comprises the following steps: the converter process, the LF process, the RH process and the slab continuous casting process are carried out, low-reactivity slag is added after the aluminum deoxidization alloying in the RH process is finished, the slag floats upwards and stays to a steel-slag interface along with the circulation of vacuum molten steel, the ladle slag is prevented from transferring oxygen to the molten steel, and meanwhile, the substances have the capability of adsorbing impurities in the steel; and controlling RH procedure treatment process parameters, preventing ladle slag from transferring oxygen to molten steel, avoiding secondary oxidation of titanium and aluminum elements in deoxidized steel, and controlling inclusion content in the steel;
the low-reactivity slag comprises the following components in percentage by mass: caO:60% -63%, al 2 O 3 ：26.3％～31％，MgO：1.5％～4.5％，SiO 2 ：0～2.9％，TiO 2 :2% -4.8%, vermiculite: 2% -4%, caO/Al 2 O 3 :2.1 to 2.4, and the balance is unavoidable impurities.
Further, in the technical scheme, the low-reactivity slag is added twice, after the aluminum deoxidization alloying is finished for 2-4 min in the RH process, the low-reactivity slag is added for the first time from a high-level bin of a vacuum chamber, after the addition is finished, the titanium iron or titanium sponge is added to steel for alloying titanium element of molten steel, after titanium is added, the low-reactivity slag is added for 1-3 min, after the low-reactivity slag is added for the second time, and after the low-reactivity slag is added to the steel for the second time, the vacuum treatment time of the molten steel is 5-10 min.
Further, in the technical scheme, 0.2kg/t of low-reactivity slag is added to 0.5kg/t of steel for the first time, and 0.2kg/t of low-reactivity slag is added to 0.5kg/t of steel for the second time.
Further, in the above technical scheme, the process parameters of controlling the RH procedure are as follows: the low-reactivity slag charge starts to be added to the RH process, argon is blown from the ladle bottom in the whole process, the argon blowing position is below the ascending pipe, the middle connecting line of the ladle bottom blowing air brick and the RH inserting pipe is in an angle of 25-35 degrees, the argon blowing flow is 50-70 NL/min, and the lifting gas flow is controlled at 1500-1700 NL/min.
Further, in the technical scheme, before the low-reactivity slag charge is added for the first time, the flow rate of the lifting gas is controlled to be 1400 NL/min-1600 NL/min.
The beneficial effects of the invention are as follows:
the invention is divided into two batches after the RH process and the aluminum deoxidization alloying are finishedImmediately adding a slag with low reactivity into the steel from a vacuum alloy bin, and floating and staying at a steel-slag interface along with the circulation of vacuum molten steel to prevent ladle slag from transferring oxygen to the molten steel, wherein the slag has the function of adsorbing Al in the steel 2 O 3 Inclusion capacity, the slag containing a certain amount of TiO is designed according to the steel grade composition requirement and through thermodynamic calculation 2 Ensuring that the slag system has certain TiO 2 Activity, preventing oxidation of titanium element in steel, reducing generation of low-melting titanium aluminum inclusion in steel, and making the steel mainly be Al 2 O 3 The surface tension of the inclusions is large, the inclusions are easy to gather and float in steel, and the improvement of the cleanliness of the ultra-low carbon steel is facilitated; and the RH treatment parameters are controlled to promote the aggregation and floating removal of inclusions in steel, and the interface structure of molten steel-low-reactivity slag charge-original slag in a ladle is not damaged, so that the ladle slag is effectively prevented from transferring oxygen to the molten steel, and the secondary oxidation of easily-oxidized elements such as titanium, aluminum and the like in the deoxidized steel is avoided, so that the method has remarkable economic and social benefits.
Drawings
FIG. 1 is a front view of an RH appliance;
FIG. 2 is a top view of a ladle in the RH process of the present invention;
in the figure: (1) the included angle of the air brick at the bottom of the steel ladle and the central line connecting line of the RH inserting tube, (2) the ascending tube, (3) the descending tube, (4) the air brick at the bottom of the steel ladle.
Detailed Description
The above-described aspects of the present invention will be described in further detail below with reference to specific embodiments in the form of examples. Given the extensive research effort performed by those skilled in the art in the RH field, a great deal of experience has been accumulated both in theory and in practice. After carefully reading the present embodiment and its corresponding analysis, it is certain that, according to other specific conditions, at most several limited conventional tests are performed within the scope of the process scheme and the slag component design proportion proposed by the present invention, and several groups of process technical schemes meeting other conditions are specifically selected to achieve the technical effects described by the present invention. Therefore, only some examples will be described below. It should not be understood that the scope of the subject matter described above is limited to the following examples, and that all techniques implemented based on the foregoing are within the scope of the invention.
Comparative example 1
The molten steel smelting adopts the technological process of converter process, LF process, RH process and slab continuous casting process. The product ingredients are shown in Table 1.
TABLE 1 Steel grade composition requirement/wt%
| C | Si | Mn | P | S | Al | Ti |
| ≤0.0035 | ≤0.020 | 0.11～0.15 | ≤0.010 | ≤0.012 | 0.02～0.05 | 0.05～0.07 |
After the vacuum decarburization is finished, directly adding metal aluminum to deoxidize molten steel and alloying aluminum element at the same time; meanwhile, argon is blown at the bottom of the whole process after RH treatment, the argon blowing flow is 80 NL/min-100 NL/min, the ladle bottom blowing air brick is opposite to the rising pipe orifice of the RH inserting pipe, and the RH lifting gas flow still keeps the decarburization stage flow 1800 NL/min-2200 NL/min.
100mm of RH outbound steel sample is subjected to using ASPEX inclusion full-automatic analyzer 2 Is obtained by the surface scanning of the tundish molten steel unit area (mm 2 ) The area of the inclusions larger than 1 μm was 52.8. Mu.m 2 The smooth continuous casting of the 6 furnaces is realized, and the inner wall of the water gap after casting is seriously nodulated and is not completely blocked.
Example 1
The molten steel smelting adopts the technological process of converter process, LF process, RH process and slab continuous casting process. The product ingredients are shown in Table 1.
After the RH aluminum-adding deoxidization alloying is finished for 2min, 0.21kg/t steel (the components are CaO:61.2wt% and Al) with low reactivity is added from a high-level bin of a vacuum chamber immediately 2 O 3 ：27.6wt％，MgO：3.5wt％，SiO 2 ：0.3wt％，TiO 2 :0.5wt% vermiculite: 2.1wt%, caO/Al 2 O 3 :2.2 Adding ferrotitanium or titanium sponge into steel for alloying titanium element, adding titanium for 1min, adding low-reactivity slag of 0.48kg/t steel for the second time, adding low-reactivity slag into steel for the second time, vacuum treating molten steel for 10min, and finishing treatment and discharging.
Before the first time of adding the low-reactivity slag, the RH lifting gas flow is adjusted to 1500NL/min, the low-reactivity slag starts to be added to the RH treatment and finishes the whole process of bottom blowing argon, the argon blowing flow is 67NL/min, and the connecting line of the ladle bottom blowing air brick and the middle line of the RH insertion pipe is at an angle of 25-35 degrees.
100mm of RH outbound steel sample is subjected to using ASPEX inclusion full-automatic analyzer 2 Is obtained by the surface scanning of the tundish molten steel unit area (mm 2 ) The area of the inclusions larger than 1 μm was 23.8. Mu.m 2 Compared with the prior art, the quality of molten steel is greatly improved, 8 furnaces are smoothly continuously poured, and the inner wall of the poured water gap is smooth and free from blockage.
Example 2
The molten steel smelting adopts the technological process of converter process, LF process, RH process and slab continuous casting process. The product ingredients are shown in Table 1.
After the RH aluminum-adding deoxidization alloying is finished for 2min, 0.48kg/t steel (the components are CaO:62.3wt% and Al) with low reactivity is added from a high-level bin of a vacuum chamber immediately 2 O 3 ：27.5wt％，MgO：2.1wt％，SiO 2 ：1.3wt％，TiO 2 :3.8wt% vermiculite: 2.0wt%, caO/Al 2 O 3 :2.3 Adding ferrotitanium or titanium sponge into steel for alloying titanium element after finishing adding 2.5min, adding titanium for 4min, adding low-reactivity slag for the second time to 0.43kg/t steel, adding low-reactivity slag for the second time into steel, and after vacuum treatment of molten steel for 8min, finishing treatment and discharging.
Controlling the flow of RH lifting gas to be 1450NL/min before adding the low-reactivity slag for the first time, and controlling the flow of argon blowing to be 55NL/min when the low-reactivity slag starts to be added to the RH treatment and finishes the whole process of bottom blowing argon, wherein the connecting line of the ladle bottom blowing air brick and the middle line of the RH insertion pipe is at an angle of 25-35 degrees.
100mm of RH outbound steel sample is subjected to using ASPEX inclusion full-automatic analyzer 2 Is obtained by the surface scanning of the tundish molten steel unit area (mm 2 ) The area of the inclusions larger than 1 μm was 26.7. Mu.m 2 Compared with the prior art, the quality of molten steel is greatly improved, 9 furnaces are smoothly continuously poured, and the inner wall of the poured water gap is smooth and free from blockage.
Example 3
The molten steel smelting adopts the technological process of converter process, LF process, RH process and slab continuous casting process. The product ingredients are shown in Table 1.
After the RH aluminum-adding deoxidization alloying is finished for 3min, 0.36kg/t of low-reactivity slag material (the components are CaO:60.1wt% and Al) is immediately added from a high-level bin of a vacuum chamber 2 O 3 ：29.3wt％，MgO：2.2wt％，SiO 2 ：2.5wt％，TiO 2 :2.4wt% vermiculite: 2.5wt%, caO/Al 2 O 3 :2.1 Adding ferrotitanium or titanium sponge into steel for alloying titanium element 3min after the addition, adding low-reactivity slag material 0.40kg/t steel for the second time and adding low-reactivity slag material for the second time 3min after the additionAnd after the slag charge is added into the steel, carrying out vacuum treatment on the molten steel for 7min, and ending the treatment and discharging.
Before the first time of adding the low-reactivity slag, the flow of the RH lifting gas is controlled to be 1420NL/min, the low-reactivity slag starts to be added to the RH treatment and is subjected to bottom blowing argon in the whole process, the argon blowing flow is 55NL/min, and the angle between the ladle bottom blowing air brick and the line connecting the RH insertion pipe is 25-35 degrees.
100mm of RH outbound steel sample is subjected to using ASPEX inclusion full-automatic analyzer 2 Is obtained by the surface scanning of the tundish molten steel unit area (mm 2 ) The area of the inclusions larger than 1 μm was 31.2. Mu.m 2 Compared with the prior art, the quality of molten steel is greatly improved, 9 furnaces are smoothly continuously poured, and the inner wall of the poured water gap is smooth and free from blockage.
Example 4
The molten steel smelting adopts the technological process of converter process, LF process, RH process and slab continuous casting process. The product ingredients are shown in Table 1.
After RH aluminum-adding deoxidization alloying is finished for 2min, 0.44kg/t steel (the main component is CaO:63wt% and Al) with low reactivity is added from a high-level bin of a vacuum chamber immediately 2 O 3 ：26.3wt％，MgO：4.2wt％，SiO 2 ：0wt％，TiO 2 :3.5wt% vermiculite: 2.0wt%, caO/Al 2 O 3 2.4), adding ferrotitanium or titanium sponge into the steel for 2.1min after the addition is finished, alloying titanium element in the molten steel, adding titanium for 3.2min, adding low-reactivity slag for the second time to 0.23kg/t of steel, adding the low-reactivity slag into the steel for the second time, carrying out vacuum treatment on the molten steel for 8min, and ending the treatment and discharging.
Controlling the flow of RH lifting gas to be 1450NL/min before adding the low-reactivity slag for the first time, and controlling the flow of argon blowing to be 55NL/min when the low-reactivity slag starts to be added to the RH treatment and finishes the whole process of bottom blowing argon, wherein the connecting line of the ladle bottom blowing air brick and the middle line of the RH insertion pipe is at an angle of 25-35 degrees.
100mm of RH outbound steel sample is subjected to using ASPEX inclusion full-automatic analyzer 2 Is obtained by the surface scanning of the tundish molten steel unit area (mm 2 ) The area of the inclusions larger than 1 μm was 35.6. Mu.m 2 The quality of molten steel is greater than that of the prior processThe width of the steel plate is improved, the smooth continuous casting of the 9 furnaces is realized, and the inner wall of the water gap after casting has slight nodulation and no blockage.
The above examples are only preferred embodiments of the present invention and are not limiting of the implementation. The protection scope of the present invention shall be subject to the scope defined by the claims. Other variations or modifications may be made in the various forms based on the above description. Obvious variations or modifications of the embodiments are within the scope of the invention.
Claims (5)
1. A control method of titanium-containing ultra-low carbon steel inclusion is characterized in that the molten steel smelting process flow is as follows: the converter process, the LF process, the RH process and the slab continuous casting process are carried out, low-reactivity slag is added after the aluminum deoxidization alloying in the RH process is finished, the slag floats upwards and stays to a steel-slag interface along with the circulation of vacuum molten steel, the ladle slag is prevented from transferring oxygen to the molten steel, and meanwhile, the substances have the capability of adsorbing impurities in the steel; and controlling RH procedure treatment process parameters, preventing ladle slag from transferring oxygen to molten steel, avoiding secondary oxidation of titanium and aluminum elements in deoxidized steel, and controlling inclusion content in the steel;
the low-reactivity slag comprises the following components in percentage by mass: caO:60% -63%, al 2 O 3 ：26.3％～31％，MgO：1.5％～4.5％，SiO 2 ：0～2.9％，TiO 2 :2% -4.8%, vermiculite: 2% -4%, caO/Al 2 O 3 :2.1 to 2.4, and the balance is unavoidable impurities.
2. The method for controlling titanium-containing ultra-low carbon steel inclusions according to claim 1, wherein: the low-reactivity slag is added twice, after the aluminum deoxidization alloying is finished for 2-4 min in the RH process, the low-reactivity slag is added for the first time from a high-level bin of a vacuum chamber, after the addition is finished for 2-4 min, ferrotitanium or titanium sponge is added to steel for alloying titanium element of molten steel, after titanium is added for 1-3 min, the low-reactivity slag is added for the second time, and after the low-reactivity slag is added to the steel for the second time, the vacuum treatment time of the molten steel is 5-10 min.
3. The method for controlling titanium-containing ultra-low carbon steel inclusions according to claim 2, wherein: the first time of adding 0.2kg/t steel to 0.5kg/t steel of low-reactivity slag and the second time of adding 0.2kg/t steel to 0.5kg/t steel of low-reactivity slag.
4. The method for controlling titanium-containing ultra-low carbon steel inclusions according to claim 1, wherein: the process parameters of the RH procedure are controlled as follows: the low-reactivity slag charge starts to be added to the RH process, argon is blown from the ladle bottom in the whole process, the argon blowing position is below the ascending pipe, the line connecting the ladle bottom blowing air brick and the center line of the RH inserting pipe is in an angle of 25-35 degrees, the argon blowing flow is 50-70 NL/min, and the lifting gas flow is controlled at 1500-1700 NL/min.
5. The method for controlling titanium-containing ultra-low carbon steel inclusions according to claim 1, wherein: before the first addition of the low-reactivity slag, the flow rate of the lifting gas is controlled between 1400NL/min and 1600NL/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311640611.8A CN117758018A (en) | 2023-11-30 | 2023-11-30 | Control method for titanium-containing ultra-low carbon steel inclusion |
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| CN202311640611.8A CN117758018A (en) | 2023-11-30 | 2023-11-30 | Control method for titanium-containing ultra-low carbon steel inclusion |
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