CN115305314A - LF-RH duplex ultra-low carbon steel production method for thin slab continuous casting and rolling production line - Google Patents
LF-RH duplex ultra-low carbon steel production method for thin slab continuous casting and rolling production line Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 68
- 238000009749 continuous casting Methods 0.000 title claims abstract description 40
- 238000005096 rolling process Methods 0.000 title claims abstract description 36
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 42
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 238000005261 decarburization Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- 239000011575 calcium Substances 0.000 claims description 12
- 230000003009 desulfurizing effect Effects 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000003607 modifier Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 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 description 4
- 239000007789 gas Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 abstract description 5
- 230000023556 desulfurization Effects 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- 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
- C21C7/10—Handling in a vacuum
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line, which comprises the following steps: after the steel is tapped from the converter, the LF furnace is heated to a target temperature, and is lifted to a single-pipe RH for processing until carbon and oxygen at the outlet of the LF furnace reach a target value, and the produced molten steel realizes the low-carbon molten steel standard, and then continuous casting is carried out stably, so that secondary oxidation in the casting process is prevented, and the casting requirement of a thin slab continuous casting and rolling production line is further met. The invention relates to a method for producing ultra-low carbon steel by using single-tube RH and LF-RH duplex, which meets the requirements of stable ultra-low carbon steel production of a thin slab continuous casting and rolling production line and can realize stable casting; by stabilizing the RH station-entering molten steel condition through the application of the LF-RH duplex process, the use of the single-tube vacuum chamber can meet the decarburization, slagging and desulfurization functions of the RH procedure, so that the produced ultra-low carbon steel can meet the production requirements of a thin slab continuous casting and rolling production line.
Description
Technical Field
The invention relates to the technical field of carbon steel production, in particular to a production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line.
Background
The ultra-low carbon steel refers to steel with the carbon content below 0.01 percent in the steel. Carbon is a traditional and most economic strengthening element, and the strength of steel is improved by solid solution strengthening of carbon in the steel. However, the strength of the carbon content in the steel is increased, and the ductility and deep drawing performance of the steel plate after rolling are greatly reduced. With the development of industrial requirements, an ultra-low carbon microalloying component design system is correspondingly adopted, so that the requirements on the strength performance of steel grades are met, and the requirements on other aspects are met. Currently, the RH single-link process is mostly adopted for smelting the ultra-low carbon steel.
The production of the ultra-low carbon steel adopts an RH single-link process, and the specificity of a sheet billet continuous casting and rolling production line has extremely high requirements on the purity and the components of molten steel, so that a technical means for stably producing the ultra-low carbon steel is lacked in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the LF-RH duplex ultra-low carbon steel production method for the thin slab continuous casting and rolling production line, which meets the requirement of stable ultra-low carbon steel production of the thin slab continuous casting and rolling.
In order to achieve the purpose, the invention provides the following technical scheme:
a production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line comprises the following steps:
after the steel is tapped from the converter, the LF furnace is heated to a target temperature, and is lifted to a single-pipe RH for processing until carbon and oxygen at the outlet of the LF furnace reach a target value, and the produced molten steel realizes the low-carbon molten steel standard, and then continuous casting is carried out stably, so that secondary oxidation in the casting process is prevented, and the casting requirement of a thin slab continuous casting and rolling production line is further met.
In some of these embodiments, the LF furnace process comprises: entering a station; processing; exiting; wherein, a modifier is added for modifying the steel slag before the steel slag is taken out of the station.
In some embodiments, the LF furnace treatment inbound conditions are: the temperature is 1540 ℃, the molten steel (C) is 0.035-0.045%, and (O) is 350-450ppm.
In some of the embodiments, the LF furnace process comprises: the temperature rising process uses calcium carbide submerged arc and the whole process is micro-positive pressure control.
In some of these embodiments, the LF furnace process outbound conditions are: the temperature is 1660 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
In some of these embodiments, the single-tube RH processing procedure comprises: entering a station; decarbonizing; slagging and desulfurizing treatment; and (4) calcium treatment.
In some of these embodiments, the single-tube RH inbound conditions are: the temperature is 1650 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
In some of these embodiments, the decarbonization process is as follows: and (3) adopting an asymmetric argon blowing mode of lifting gas by using an immersion tube, wherein the decarburization time is 20min, the end point [ C ] in the steel is less than or equal to 20ppm, and after the decarburization is finished, adding aluminum particles into the vacuum chamber to perform molten steel deoxidation.
In some of these embodiments, the slagging desulfurization process is as follows: lime and aluminum particles are added into a vacuum chamber, the argon blowing mode of the dip pipe is switched to asymmetric argon blowing auxiliary ladle bottom blowing, the slagging and desulfurizing functions are realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the sum of FeO and MnO in slag is less than or equal to 2%.
In some of these embodiments, the calcium treatment process is as follows: the calcium treatment of the molten steel is realized by adding the silicon-calcium alloy into the vacuum chamber.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line provided by the invention meets the requirements of the thin slab continuous casting and rolling production line, is a production method of the ultra-low carbon steel using single-tube RH and LF-RH duplex, meets the requirements of stable production of the ultra-low carbon steel for the thin slab continuous casting and rolling production line, and can realize stable casting.
By stabilizing the RH station-entering molten steel condition through the application of the LF-RH duplex process, the use of the single-tube vacuum chamber can meet the decarburization, slagging and desulfurization functions of the RH procedure, so that the produced ultra-low carbon steel can meet the production requirements of a thin slab continuous casting and rolling production line.
Detailed Description
The following detailed description of the present invention is provided in connection with specific embodiments to further understand the objects, schemes and effects of the present invention, but not to limit the scope of the appended claims.
The invention provides a production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line, which comprises the following steps:
after tapping of the converter, the LF furnace is heated to a target temperature until carbon and oxygen at the outlet of the LF furnace reach a target value, the LF furnace is lifted to a single tube RH for processing until the produced molten steel achieves the low-carbon molten steel standard, and then continuous casting is carried out stably, so that secondary oxidation in the casting process is prevented, and the casting requirement of a thin slab continuous casting and rolling production line is further met.
Wherein, LF stove treatment process includes: entering a station; carrying out process treatment; exiting; wherein, a modifier is added for modifying the steel slag before the steel slag is taken out of the station.
Specifically, the LF furnace treatment station entering conditions are as follows: the temperature is 1540 ℃, the molten steel [ C ] is 0.035-0.045%, and the molten steel [ O ] is 350-450ppm.
Specifically, the LF furnace comprises the following steps: the temperature rising process uses calcium carbide submerged arc and the whole process is controlled by micro positive pressure.
Specifically, the LF furnace treatment outbound conditions are as follows: the temperature is 1660 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
Wherein, the single-tube RH processing process comprises the following steps: entering a station; decarbonizing; slagging and desulfurizing treatment; and (4) calcium treatment.
Specifically, the single-pipe RH station entering conditions are as follows: the temperature is 1650 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
Specifically, the decarburization treatment process is as follows: and (3) adopting an asymmetric argon blowing mode of lifting gas of an immersion pipe, wherein the decarburization time is 20min, the end point [ C ] in the steel is less than or equal to 20ppm, and after the decarburization is finished, adding aluminum particles into the vacuum chamber to deoxidize the molten steel.
Specifically, the slagging and desulfurizing treatment process comprises the following steps: lime and aluminum particles are added into a vacuum chamber, the argon blowing mode of the dip pipe is switched to asymmetric argon blowing auxiliary steel ladle bottom blowing, the slagging and desulfurizing functions are realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the content of FeO and MnO in slag is less than or equal to 2%.
Specifically, the calcium treatment process is as follows: the calcium treatment of the molten steel is realized by adding the silicon-calcium alloy into the vacuum chamber.
The embodiment provides a method for producing ultra-low carbon steel by using a single-tube RH and LF-RH duplex, which meets the requirement of a thin slab continuous casting and rolling production line, and meets the requirement of stable ultra-low carbon steel production of the thin slab continuous casting and rolling production line. The RH furnace is changed from the traditional double-tube RH into a single-tube RH. After tapping of the converter, the LF furnace is heated to a target temperature, the process ensures that the carbon and oxygen discharged from the furnace reach the target value through submerged arc and micro positive pressure control, and then the furnace is hoisted to RH for treatment. The RH treatment process respectively carries out decarburization, slagging and desulfurization treatment, realizes that [ C ] is less than or equal to 0.002%, [ S ] is less than or equal to 0.003% in the production molten steel, and ultralow-carbon molten steel with (FeO) + (MnO) in slag is less than or equal to 2%, thereby meeting the casting requirement of a thin slab continuous casting and rolling production line. And the RH station-entering molten steel condition is stabilized by applying an LF-RH duplex process. The use of the single-tube vacuum chamber can meet the decarburization, slagging and desulfurization functions of the RH process, so that the produced ultra-low carbon steel can meet the production requirements of a thin slab continuous casting and rolling production line.
Example 1
The embodiment provides a production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line, which comprises the following steps: after the steel is tapped from the converter, the LF furnace is heated to a target temperature, and is lifted to a single-pipe RH for processing until carbon and oxygen at the outlet of the LF furnace reach a target value, and the produced molten steel realizes the low-carbon molten steel standard, and then continuous casting is carried out stably, so that secondary oxidation in the casting process is prevented, and the casting requirement of a thin slab continuous casting and rolling production line is further met.
Wherein, LF stove treatment process includes: entering a station; carrying out process treatment; exiting the station; wherein, a modifier is added for modifying the steel slag before the steel slag is taken out of the station. Specifically, the LF furnace treatment station entering conditions are as follows: the temperature is 1540 ℃, the molten steel [ C ] is 0.035-0.045%, and the molten steel [ O ] is 350-450ppm. Specifically, the LF furnace comprises the following steps: the temperature rising process uses calcium carbide submerged arc and the whole process is micro-positive pressure control. Specifically, the LF furnace treatment outbound conditions are as follows: the temperature is 1660 ℃, the molten steel (C) is 0.035-0.045%, and the molten steel (O) is 350-450ppm.
Wherein, the single-tube RH processing process comprises the following steps: entering a station; decarbonizing; slagging and desulfurizing treatment; and (4) calcium treatment. Specifically, the single-pipe RH arrival conditions are: the temperature is 1650 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm. Specifically, the decarburization treatment process is as follows: and (3) adopting an asymmetric argon blowing mode of lifting the body of the dip pipe by adopting a dip pipe, wherein the decarburization time is 20min, the end point [ C ] in the steel is less than or equal to 20ppm, and after the decarburization is finished, adding aluminum particles into a vacuum chamber to perform molten steel deoxidation. Specifically, the slagging and desulfurizing treatment process comprises the following steps: lime and aluminum particles are added into a vacuum chamber, the argon blowing mode of the dip pipe is switched to asymmetric argon blowing auxiliary ladle bottom blowing, the slagging and desulfurizing functions are realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the sum of FeO and MnO in slag is less than or equal to 2%. Specifically, the calcium treatment process is as follows: the calcium treatment of the molten steel is realized by adding the silicon-calcium alloy into the vacuum chamber.
The effect indexes are as follows: the content of C in the produced molten steel is less than or equal to 0.002%, the content of S is less than or equal to 0.003%, and the content of FeO and MnO in the slag is less than or equal to 2%.
Comparative example 1
The other specific steps of the method for producing ultra low carbon steel using a double-pipe RH are as in example 1.
The effect indexes are as follows: [C] not more than 0.002%, not less than 0.015% and FeO and MnO in the slag not less than 8%.
Comparative example 2
The method for producing ultra-low carbon steel by adopting the RH single-stage process comprises the following specific steps of example 1.
The effect indexes are as follows: [C] not more than 0.002%, not less than 0.015% and FeO and MnO in the slag not less than 8%.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (10)
1. A production method of LF-RH duplex ultra-low carbon steel for a thin slab continuous casting and rolling production line is characterized by comprising the following steps: the method comprises the following steps:
after the steel is tapped from the converter, the LF furnace is heated to a target temperature, and is lifted to a single-pipe RH for processing until carbon and oxygen at the outlet of the LF furnace reach a target value, and the produced molten steel realizes the low-carbon molten steel standard, and then continuous casting is carried out stably, so that secondary oxidation in the casting process is prevented, and the casting requirement of a thin slab continuous casting and rolling production line is further met.
2. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 1, which is characterized in that: the LF furnace treatment process comprises the following steps: entering a station; carrying out process treatment; exiting; wherein, a modifier is added for modifying the steel slag before the steel slag is taken out of the station.
3. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 2, which is characterized in that: the LF furnace treatment station entering conditions are as follows: the temperature is 1540 ℃, the molten steel [ C ] is 0.035-0.045%, and the molten steel [ O ] is 350-450ppm.
4. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 2, which is characterized in that: the LF furnace process treatment step comprises: the temperature rising process uses calcium carbide submerged arc and the whole process is micro-positive pressure control.
5. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 2, which is characterized in that: the LF furnace treatment outbound conditions are as follows: the temperature is 1660 ℃, the molten steel (C) is 0.035-0.045%, and the molten steel (O) is 350-450ppm.
6. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 1, which is characterized in that: the single-tube RH processing process comprises the following steps: entering a station; decarbonizing; slagging and desulfurizing treatment; and (4) calcium treatment.
7. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 6, which is characterized in that: the single-pipe RH station-entering conditions are as follows: the temperature is 1650 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
8. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 6, which is characterized in that: the decarburization treatment process is as follows: and (3) adopting an asymmetric argon blowing mode of lifting gas by using an immersion tube, wherein the decarburization time is 20min, the end point [ C ] in the steel is less than or equal to 20ppm, and after the decarburization is finished, adding aluminum particles into the vacuum chamber to perform molten steel deoxidation.
9. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 6, which is characterized in that: the slagging and desulfurizing treatment process comprises the following steps: lime and aluminum particles are added into a vacuum chamber, the argon blowing mode of the dip pipe is switched to asymmetric argon blowing auxiliary ladle bottom blowing, the slagging and desulfurizing functions are realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the sum of FeO and MnO in slag is less than or equal to 2%.
10. The production method of the LF-RH duplex ultra-low carbon steel for the thin slab continuous casting and rolling production line of claim 6, which is characterized in that: the calcium treatment process is as follows: the calcium treatment of the molten steel is realized by adding the silicon-calcium alloy into the vacuum chamber.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792845A (en) * | 2009-11-20 | 2010-08-04 | 北京科大三泰科技发展有限公司 | Method for smelting ultra-low-carbon steel by using single-nozzle refining furnace |
| CN103525982A (en) * | 2013-10-23 | 2014-01-22 | 马钢(集团)控股有限公司 | Single-dip-pipe vacuum refining device and using method thereof |
| US20170029919A1 (en) * | 2014-06-18 | 2017-02-02 | Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co. Ltd. | A steel rebar and a production method thereof |
| CN108018403A (en) * | 2017-12-19 | 2018-05-11 | 中国地质大学（武汉） | A kind of method of thin-slab caster production automobile using extra-deep drawing steel |
| CN109706284A (en) * | 2019-01-31 | 2019-05-03 | 邯郸钢铁集团有限责任公司 | A method of ultra low carbon IF steel is produced based on CSP thin-slab caster |
| CN109943680A (en) * | 2017-12-21 | 2019-06-28 | 广东韶钢松山股份有限公司 | A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet |
| CN110982979A (en) * | 2019-12-30 | 2020-04-10 | 首钢集团有限公司 | Production method of ultra-low carbon steel for iron-based alloy |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792845A (en) * | 2009-11-20 | 2010-08-04 | 北京科大三泰科技发展有限公司 | Method for smelting ultra-low-carbon steel by using single-nozzle refining furnace |
| CN103525982A (en) * | 2013-10-23 | 2014-01-22 | 马钢(集团)控股有限公司 | Single-dip-pipe vacuum refining device and using method thereof |
| US20170029919A1 (en) * | 2014-06-18 | 2017-02-02 | Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co. Ltd. | A steel rebar and a production method thereof |
| CN108018403A (en) * | 2017-12-19 | 2018-05-11 | 中国地质大学（武汉） | A kind of method of thin-slab caster production automobile using extra-deep drawing steel |
| CN109943680A (en) * | 2017-12-21 | 2019-06-28 | 广东韶钢松山股份有限公司 | A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet |
| CN109706284A (en) * | 2019-01-31 | 2019-05-03 | 邯郸钢铁集团有限责任公司 | A method of ultra low carbon IF steel is produced based on CSP thin-slab caster |
| CN110982979A (en) * | 2019-12-30 | 2020-04-10 | 首钢集团有限公司 | Production method of ultra-low carbon steel for iron-based alloy |
Non-Patent Citations (1)
| Title |
|---|
| 俞海明: "转炉钢水的炉外精练技术", 31 August 2011, 冶金工业出版社, pages: 224 - 225 * |
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