CN115305316A - RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line - Google Patents
RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line Download PDFInfo
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- CN115305316A CN115305316A CN202210991317.0A CN202210991317A CN115305316A CN 115305316 A CN115305316 A CN 115305316A CN 202210991317 A CN202210991317 A CN 202210991317A CN 115305316 A CN115305316 A CN 115305316A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 71
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 39
- 238000009749 continuous casting Methods 0.000 title claims abstract description 35
- 238000005096 rolling process Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000005261 decarburization Methods 0.000 claims abstract description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 15
- 239000011575 calcium Substances 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 6
- 229910000882 Ca alloy Inorganic materials 0.000 claims abstract description 5
- 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
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 9
- 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
- 238000012545 processing Methods 0.000 claims description 7
- 230000003009 desulfurizing effect Effects 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 238000006477 desulfuration reaction Methods 0.000 abstract description 13
- 230000023556 desulfurization Effects 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification 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
- 230000000052 comparative effect Effects 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
- 238000005470 impregnation 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—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
Landscapes
- 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 RH single-linkage ultra-low carbon steel for a thin slab continuous casting and rolling production line, which is characterized by comprising the following steps of: the production method of the single-tube RH and RH single-connection ultra-low carbon steel specifically comprises the following steps: after tapping of the converter, the steel is lifted to a single tube RH for treatment 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. The single-tube RH is used, is a RH single-connection ultra-low carbon steel production method, and meets the requirement of stable ultra-low carbon steel production of a thin slab continuous casting and rolling production line. The use of the single-tube vacuum chamber can meet the decarburization, slagging and desulfurization functions of an RH process, and can stably produce ultra-low carbon steel, so that the produced ultra-low carbon steel meets the production requirements of a thin slab continuous casting and rolling production line; meanwhile, calcium treatment in the vacuum chamber is realized by using the silicon-calcium alloy, so that the castability of the molten steel meets the production requirement.
Description
Technical Field
The invention relates to the technical field of carbon steel production, in particular to a production method of RH single-linkage ultra-low carbon steel of 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 of the steel grade on strength performance are met, and the requirements of other aspects are met. Currently, the RH single-link process is mostly adopted for smelting the ultra-low carbon steel.
In the prior art, an RH single-connection ultra-low carbon steel production process is generally adopted, a sheet billet continuous casting and rolling production line has extremely high requirements on the purity and components of molten steel due to the particularity of a production line, and a traditional double-tube RH furnace cannot realize the functions of slag changing and desulfurization in a vacuum chamber, so that a technical means for stably producing the ultra-low carbon steel is not provided.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a production method of RH single-connection ultra-low carbon steel for a thin slab continuous casting and rolling production line, which uses a single tube RH to realize the functions of decarbonization, slagging and desulfurization in an RH process.
In order to achieve the purpose, the invention provides the following technical scheme:
a production method of RH single-connection ultra-low carbon steel of a sheet billet continuous casting and rolling production line is a production method of RH single-connection ultra-low carbon steel by using a single tube, and specifically comprises the following steps:
after converter tapping, the steel 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.
In some of these embodiments, the converter 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.
In some of these embodiments, the single tube RH treatment process comprises: entering a station; decarbonizing; slagging and desulfurizing treatment; and (4) calcium treatment.
In some of these embodiments, the single RH inbound conditions are: the temperature is 1650 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
In some embodiments, the decarburization treatment process adopts an asymmetric argon blowing mode that the volume of the impregnation tube is lifted, the decarburization time is 20min, and the end point [ C ] in the steel is less than or equal to 20ppm;
in some of these examples, the molten steel is deoxygenated by adding aluminum particles to the vacuum chamber after the decarburization is complete.
In some embodiments, lime and aluminum particles are added into the vacuum chamber during the slagging desulfurization treatment process, the argon blowing mode of the dip pipe is switched to asymmetric argon blowing auxiliary ladle bottom blowing, the slagging desulfurization function is realized, the end point [ S ] in steel is less than or equal to 30ppm, and the content of (FeO) + (MnO) in slag is less than or equal to 2%.
In some embodiments, the calcium treatment process realizes molten steel calcium treatment by adding calcium-silicon alloy into the vacuum chamber.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the RH single-connection ultra-low carbon steel production method of the sheet billet continuous casting and rolling production line uses single RH, is an RH single-connection ultra-low carbon steel production method, and meets the requirement of stable ultra-low carbon steel production of the sheet billet continuous casting and rolling production line. The use of the single-tube vacuum chamber can meet the decarburization, slagging and desulfurization functions of an RH process, and can stably produce ultra-low carbon steel, so that the produced ultra-low carbon steel meets the production requirements of a thin slab continuous casting and rolling production line; meanwhile, calcium treatment in the vacuum chamber is realized by using the silicon-calcium alloy, so that the castability of the molten steel meets the production requirement.
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 RH single-connection ultra-low carbon steel of a sheet billet continuous casting and rolling production line, which is a production method of RH single-connection ultra-low carbon steel by using a single tube and specifically comprises the following steps:
after converter tapping, the steel 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, the converter 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 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 adopts an asymmetric argon blowing mode of lifting the volume of the dip pipe by the dip pipe, the decarburization time is 20min, and the end point [ C ] in the steel is less than or equal to 20ppm; specifically, after the decarburization is completed, molten steel is deoxidized by adding aluminum particles into a vacuum chamber. In the slagging desulfurization treatment process, 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 desulfurization function is realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the content of (FeO) + (MnO) in slag is less than or equal to 2%. Specifically, in the calcium treatment process, the calcium treatment of the molten steel is realized by adding a calcium-silicon alloy into a vacuum chamber.
The invention provides a production method of RH single-connection ultra-low carbon steel of a sheet billet continuous casting and rolling production line, which is a production method of RH single-connection ultra-low carbon steel by using a single RH pipe. The stable production of the ultra-low carbon steel of the sheet billet continuous casting and rolling production line is met, the functions of slag changing and desulfurization in a vacuum chamber are realized, the ultra-low carbon steel can be stably produced, and the RH furnace is changed from the traditional double-pipe RH into the single-pipe RH; after tapping of the converter, hoisting 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. 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. Calcium treatment in the vacuum chamber is realized by using the silicon-calcium alloy, so that the castability of the molten steel meets the production requirement.
Example 1
The embodiment provides a production method of RH single-linkage ultra-low carbon steel for a thin slab continuous casting and rolling production line, which comprises the following steps:
after converter tapping, the steel 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, the converter 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 adopts an asymmetric argon blowing mode of lifting the volume of the dip pipe by the dip pipe, the decarburization time is 20min, and the end point [ C ] in the steel is less than or equal to 20ppm; specifically, after the decarburization is completed, molten steel is deoxidized by adding aluminum particles into a vacuum chamber. In the slagging desulfurization treatment process, lime and aluminum particles are added into a vacuum chamber, the argon blowing mode of the dip pipe is asymmetric argon blowing switching auxiliary steel ladle bottom blowing, the slagging desulfurization function is realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the content of (FeO) + (MnO) in slag is less than or equal to 2%. Specifically, in the calcium treatment process, the calcium treatment of the molten steel is realized by adding a silicon-calcium alloy into a 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: in the production of molten steel, [ [ C ] is less than or equal to 0.003%, and [ S ] is more than or equal to 0.015%, and in the slag, (FeO) + (MnO) is more than or equal to 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 (8)
1. A production method of RH single-connection ultra-low carbon steel of a thin slab continuous casting and rolling production line is characterized in that: the production method of the single-tube RH and RH single-connection ultra-low carbon steel specifically comprises the following steps:
after converter tapping, the steel 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.
2. The production method of the RH single-linkage ultra-low carbon steel of the thin slab continuous casting and rolling production line of claim 1, which is characterized in that: the converter outbound conditions were as follows: the temperature is 1660 ℃, the molten steel [ C ] is 0.035-0.045%, and [ O ] is 350-450ppm.
3. The production method of the RH single-linkage ultra-low carbon steel of 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.
4. The RH single-linkage ultra-low carbon steel production method of the thin slab continuous casting and rolling production line of claim 2, wherein: 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.
5. The production method of the RH single-linked ultra-low carbon steel for the continuous thin slab casting and rolling production line of claim 2, which is characterized in that: the decarburization treatment process adopts an asymmetric argon blowing mode of an immersion tube lifting gas, the decarburization time is 20min, and the end point [ C ] in steel is less than or equal to 20ppm.
6. The RH single-linkage ultra-low carbon steel production method of the thin slab continuous casting and rolling production line of claim 4, wherein: after the decarburization is completed, molten steel is deoxidized by adding aluminum particles into the vacuum chamber.
7. The RH single-linkage ultra-low carbon steel production method of the thin slab continuous casting and rolling production line of claim 2, wherein: in the slagging and desulfurizing treatment process, 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 function is realized, the terminal point [ S ] in steel is less than or equal to 30ppm, and the content of (FeO) + (MnO) in slag is less than or equal to 2%.
8. The RH single-linkage ultra-low carbon steel production method of the thin slab continuous casting and rolling production line of claim 2, wherein: in the calcium treatment process, the calcium treatment of the molten steel is realized by adding the silicon-calcium alloy into the vacuum chamber.
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| CN202210991317.0A CN115305316A (en) | 2022-08-18 | 2022-08-18 | RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line |
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| CN202210991317.0A CN115305316A (en) | 2022-08-18 | 2022-08-18 | RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line |
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|---|---|---|---|---|
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-
2022
- 2022-08-18 CN CN202210991317.0A patent/CN115305316A/en active Pending
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| Title |
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