CN116200574A - Production process of sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace - Google Patents
Production process of sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace Download PDFInfo
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- CN116200574A CN116200574A CN202310172909.4A CN202310172909A CN116200574A CN 116200574 A CN116200574 A CN 116200574A CN 202310172909 A CN202310172909 A CN 202310172909A CN 116200574 A CN116200574 A CN 116200574A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 47
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 44
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 24
- 239000011593 sulfur Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 title claims abstract description 16
- 238000009749 continuous casting Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 36
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 27
- 230000023556 desulfurization Effects 0.000 claims abstract description 27
- 238000010079 rubber tapping Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 88
- 239000010959 steel Substances 0.000 claims description 88
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 64
- 238000007664 blowing Methods 0.000 claims description 34
- 229910052786 argon Inorganic materials 0.000 claims description 32
- 239000002893 slag Substances 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 25
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 18
- 239000004571 lime Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 238000003723 Smelting Methods 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 238000005275 alloying Methods 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 7
- 239000003607 modifier Substances 0.000 claims description 7
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 239000010436 fluorite Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 abstract description 6
- 239000000047 product Substances 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005502 peroxidation Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- GQCYCMFGFVGYJT-UHFFFAOYSA-N [AlH3].[S] Chemical compound [AlH3].[S] GQCYCMFGFVGYJT-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse 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
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace production process, which comprises a decarburization, aluminum deoxidation and deep desulfurization method after electric furnace tapping and a continuous decarburization, aluminum deoxidation and deep desulfurization method in a ladle refining furnace process.
Description
Technical Field
The invention relates to a steel smelting process, in particular to a production process of a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace.
Background
The traditional electric furnace smelting is generally suitable for carbon steel or alloy steel with carbon content of more than 0.10%, and when the electric furnace is used for smelting low-carbon steel, the oxidizing property of molten steel cannot be accurately controlled due to difficult later decarburization, so that the peroxidation of the molten steel is caused, the recovery rate of waste steel is low, the consumption of steel materials is increased, and meanwhile, the electrode consumption is reduced and the service life is increased; the consumption of deoxidized alloy of the ladle refining furnace is increased, the deoxidization of molten steel and the removal of oxide inclusions are more difficult, the smelting of clean steel is not facilitated, and the production cost is remarkably increased.
The steel rolling production line variety corresponding to the traditional electric furnace has wider requirements on sulfur content, and the short-flow ESP production line has high pulling speed, and the thin low-carbon steel variety has strict requirements on carbon and sulfur components. When the converter is used for smelting low-sulfur steel, molten iron pretreatment desulfurization is generally carried out, and the relative pressure of molten steel desulfurization after tapping is not large. The full scrap steel of the electric furnace is smelted, the desulfurization condition is not provided, the terminal sulfur content is high and unstable, the deep desulfurization time of the ladle refining furnace process is short, the carburetion is prevented, and the process difficulty is high.
Disclosure of Invention
In view of the above, the present invention provides a method for continuing decarburization, aluminum deoxidation and deep desulfurization after electric furnace tapping and in the ladle refining furnace process.
The technical scheme of the invention is as follows:
a production process of a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace is characterized by comprising the following steps:
step 1: adding scrap steel into an electric furnace, controlling foam slag in the whole process, blowing air bricks at the bottom of the electric furnace, blowing argon in the whole process, and smelting in the electric furnace;
step 2: when the electric furnace is smelted to the end point, the electric furnace is heated and controlled in temperature, and the end point carbon content of the electric furnace is controlled;
step 3: in the tapping process, an argon blowing flow model of the ladle refining furnace is optimized, the molten steel is fully stirred in the process, lime is added into the molten steel along with the flow direction of the steel, aluminum-containing deoxidized alloy is not added in the tapping process, ferrosilicon and silicon manganese alloy are not added in the tapping process, and only low-carbon ferromanganese is added;
step 4: the molten steel enters a ladle refining furnace, slag breaking, temperature measurement, oxygen measurement and sampling are firstly carried out, if the temperature is lower than 1550 ℃, power transmission heating is carried out, the power transmission temperature is increased to 1580-1600 ℃, the oxygen content of the molten steel in the ladle refining furnace is controlled to be 300-500ppm, argon is properly blown into the double holes of the ladle refining furnace, and after the power transmission heating is stopped for 1-2 minutes, the molten steel sample is taken after stirring uniformly again;
step 5: after the molten steel sample composition is assayed, if the carbon content of the molten steel meets the target requirement, starting to add aluminum ingot for deoxidization, adding modifier, refining slag and lime to make reducing slag, feeding electricity and heating, and carrying out first stirring and desulfurization;
step 6: according to the detected components, aluminum wires are secondarily supplemented for deoxidization and alloying, slag is formed according to slag Kuang Bujia lime fluorite, secondary stirring and desulfurization are carried out, soft blowing is carried out after the component temperature is proper to promote the floating of inclusions, and a calcium wire is fed before steel feeding.
Preferably, in the step 2, the temperature of the electric furnace is controlled within the range of 1640-1660 ℃ to ensure that the final carbon content of the electric furnace is controlled within the range of 0.04% -0.06%.
Preferably, in the step 3, the bottom of the ladle refining furnace is opened for blowing argon 2 minutes in advance in the tapping process, and the argon flow in the whole tapping process is 30-50nm 3 And/h, ensuring that the molten steel is fully stirred in the process.
Preferably, in the step 4, the argon is strongly stirred by bottom blowing, and the flow rate of the argon by double-hole bottom blowing is 30-70nm 3 /h。
Preferably, in the step 5, if the carbon content of molten steel is less than 0.045%, aluminum ingot is added for deoxidization according to the oxygen content of molten steel, modifier and refining slag are added after the aluminum ingot is melted, lime is added for slagging, the temperature of power transmission and temperature rise is controlled at 1590-1600 ℃, first strong stirring desulfurization is carried out, and the flow of bottom blowing argon is controlled at 30-70nm 3 /h。
Preferably, in the step 6, the aluminum wires are added to ensure that the aluminum component is in the range of 0.015-0.050%, the slag Kuang Bujia lime is used for alloying, the secondary strong stirring is carried out for 3-4 minutes for desulfurization, and the argon flow is 30-70nm 3 And/h. Soft blowing after proper component temperature promotes the floating of inclusions, and feeding a calcium wire for secondary stirring and desulfurization before steel feeding.
Preferably, the low carbon low sulfur aluminum killed steel has a carbon content of < 0.045%, a sulfur content of < 0.003% and an AL content of 0.015-0.050%.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The invention realizes the purpose of continuously decarbonizing molten steel in the electric furnace tapping process and the ladle refining furnace process, effectively solves the defect that carbon in the molten steel cannot be removed to the target requirement due to difficult electric furnace smelting decarbonization, simultaneously solves the strict requirement of ESP sheet continuous casting and continuous rolling on molten steel on low sulfur, and ensures the product quality of hot rolled steel coils.
(2) The method provided by the invention can effectively solve the adverse effects of excessive flushing and erosion of the furnace lining, increased consumption of steel materials, increased production cost and the like caused by forced oxygen blowing of the electric furnace, and is beneficial to improving the furnace life, reducing various consumption, shortening the smelting period and reducing the production cost.
(3) When the ladle refining furnace is used for continuously decarburizing, compared with an electric furnace, the ladle refining furnace has more flexible functions of heating, temperature measurement, sampling and the like of molten steel, can more accurately control the carbon content in the molten steel, and ensures that the carbon content in the molten steel enters a target range.
Detailed Description
The present invention will be described in detail with reference to specific examples.
A production process of a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace comprises the following steps:
step 1: adding scrap steel into an electric furnace, controlling foam slag in the whole process, blowing air bricks at the bottom of the electric furnace, blowing argon in the whole process, and smelting in the electric furnace;
step 2: when the electric furnace is smelted to the end point, the electric furnace is heated and controlled in temperature, and the end point carbon content of the electric furnace is controlled;
step 3: in the tapping process, an argon blowing flow model of the ladle refining furnace is optimized, the molten steel is fully stirred in the process, lime is added into the molten steel along with the flow direction of the steel, aluminum-containing deoxidized alloy is not added in the tapping process, ferrosilicon and silicon manganese alloy are not added in the tapping process, and only low-carbon ferromanganese is added;
step 4: the molten steel enters a ladle refining furnace, slag breaking, temperature measurement, oxygen measurement and sampling are firstly carried out, if the temperature is lower than 1550 ℃, power transmission heating is carried out, the power transmission temperature is increased to 1580-1600 ℃, the oxygen content of the molten steel in the ladle refining furnace is controlled to be 300-500ppm, argon is properly blown into the double holes of the ladle refining furnace, and after the power transmission heating is stopped for 1-2 minutes, the molten steel sample is taken after stirring uniformly again;
step 5: after the molten steel sample composition is assayed, if the carbon content of the molten steel meets the target requirement, starting to add aluminum ingot for deoxidization, adding modifier, refining slag and lime to make reducing slag, feeding electricity and heating, and carrying out first stirring and desulfurization;
step 6: according to the detected components, aluminum wires are secondarily supplemented for deoxidization and alloying, slag is formed according to slag Kuang Bujia lime fluorite, secondary stirring and desulfurization are carried out, soft blowing is carried out after the component temperature is proper to promote the floating of inclusions, and a calcium wire is fed before steel feeding.
The invention is further described with reference to the following specific examples:
a production process of a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace comprises the following steps:
the electric furnace adopts a mode of adding all scrap steel in 4 batches, foam slag is controlled in the whole process, and argon is blown into 5 bottom blowing air bricks in the whole process to uniform the component temperature; the electric furnace is internally provided with a burner for heating and cutting scrap steel, a carbon powder gun capable of spraying carbon powder into the electric furnace and a carbon oxygen top gun; the carbon-oxygen top gun is used for blowing oxygen and spraying carbon powder, and plays roles in cutting scrap steel, improving a heat source, decarburizing, foaming slag and stirring a molten pool.
About 118t of tapping amount of the electric furnace, when the electric furnace is smelted to the end point, taking a molten steel sample 1, wherein the carbon content of the end point of the electric furnace is controlled to be 0.040% -0.060%, in the tapping process, when the molten steel is discharged to 20-30t, 300kg of lime is added into the molten steel along with the flow direction of the molten steel, and when the molten steel is discharged to 40t, 350kg of low-carbon ferromanganese is added;argon blowing flow at bottom of ladle refining furnace in tapping process of 40nm 3 And/h, the molten steel surface is turned over to take a disc shape, and the bottom blowing molten steel sample 2 is closed after tapping is finished.
Molten steel enters a ladle refining furnace, slag breaking, temperature measurement, oxygen determination and sampling are firstly carried out, if the temperature is lower than the required temperature, the power transmission heating time is determined according to the actual temperature, argon blowing at the bottom of the ladle refining furnace is properly regulated, and the flow of the double-hole bottom argon blowing is 30-70nm 3 And (h) taking a molten steel sample 3 after stirring uniformly again when power transmission is stopped for 1-2 min.
After the 3-component test of the molten steel sample, if the carbon content of the molten steel is less than 0.045%, adding 200-300kg of aluminum ingot for deoxidization according to the oxygen content of the molten steel, adding 300kg of modifier and 200kg of refining slag after the aluminum ingot is melted, adding 1500kg of lime for slagging, controlling the temperature within the range of 1590-1600 ℃, carrying out first strong stirring for 5-6 minutes for desulfurization, and carrying out argon flow of 30-70nm 3 And/h, power transmission is carried out, the temperature is increased to about 1600 ℃, the first stirring desulfurization process is carried out, and the molten steel sample 4 is taken after 5-6 minutes.
According to the detected components, aluminum wires are secondarily supplemented for deoxidization and alloying, slag Kuang Bujia lime fluorite slag is formed, secondary stirring desulfurization is carried out for 3-4 minutes, a molten steel sample 5 is taken after stirring is completed, soft blowing is carried out after the component temperature is proper, inclusion floating is promoted, and a calcium wire is fed for 200-300M before steel feeding, so that the fluidity of molten steel is improved.
The data of 10 times of smelting by this method are shown in tables 1, 2 and 3.
As shown in table 1, after the molten steel is tapped from an electric furnace, the continuous decarburization process is stable and obvious, the molten steel is decarburized to be less than 0.043%, and the finished product completely meets the requirement that the target carbon is less than 0.045%;
in the table 2, the sulfur content of the electric furnace tapping is higher, and after deep desulfurization of a ladle refining furnace, the finished product completely meets the requirement that the target sulfur is less than 0.003%;
as shown in Table 3, after aluminum deoxidization and slagging, aluminum wire feeding is performed in time to supplement aluminum, and the aluminum content of the finished product reaches the range of 0.015% -0.050% of steel grade.
Table 1: decarburization data of ladle refining furnace after tapping of 115 ton quantum electric furnace
Table 2: desulfurization data of 115 ton quantum electric furnace after tapping and ladle refining furnace
Table 3: deoxidizing process of 115 ton quantum electric furnace ladle refining furnace and finished product aluminum content data
According to the control method, in the actual production process, the method achieves the aim of steel grade component requirements, reduces the production cost, improves the furnace life and shortens the smelting period.
In the embodiment of the invention, in the step 2, the temperature of the electric furnace is controlled within the range of 1640-1660 ℃, the phenomenon of hanging materials on the furnace wall cannot occur, the temperature is controlled accurately, the carbon content of the end point of the electric furnace is controlled within the range of 0.04-0.06%, and the peroxidation of molten steel is reduced.
In the step 3, the ladle refining furnace bottom is opened for blowing argon 2 minutes in advance in the tapping process, and the argon flow is 30-50nm in the whole tapping process 3 And/h, ensuring the full stirring of molten steel in the process, promoting further carbon-oxygen chemical reaction in the tapping process, and reducing the carbon content in the molten steel.
In one embodiment of the invention, in step 4, argon is blown into the bottom to be stirred strongly,the flow rate of the argon blown from the bottom of the double holes is 30-70nm 3 /h。
In step 5, if the carbon content of molten steel is less than 0.045%, aluminum ingot is added for deoxidization according to the fixed oxygen content of molten steel, modifier and refining slag are added after the aluminum ingot is melted, lime is added for slagging, the temperature of power transmission and heating is controlled at 1590-1600 ℃, first strong stirring desulfurization is carried out, and the flow rate of bottom blowing argon is controlled at 30-70nm 3 And/h, further oxidizing reaction of oxygen in the molten steel and carbon element to realize the purpose of low-carbon steel.
In one embodiment of the invention, in the step 6, the aluminum wires are added to ensure that the aluminum component is in the range of 0.015-0.050%, the slag Kuang Bujia lime is used for alloying, the secondary strong stirring is carried out for 3-4 minutes for desulfurization, and the argon flow is 30-70nm 3 And/h. Soft blowing after the component temperature is proper promotes the floating of inclusions, and the inclusions are fed with a calcium line for secondary stirring and desulfurization before being added into steel, so that the fluidity of molten steel is improved.
The above-mentioned and other embodiments may be applied to other fields by any person skilled in the art using the above-mentioned disclosure to make changes or modifications to the equivalent embodiments, but any simple modification, equivalent changes and modifications made to the above-mentioned embodiments according to the technical matter of the present invention will still fall within the scope of the technical solution of the present invention.
Claims (7)
1. A production process of a sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace is characterized by comprising the following steps:
step 1: adding scrap steel into an electric furnace, controlling foam slag in the whole process, blowing air bricks at the bottom of the electric furnace, blowing argon in the whole process, and smelting in the electric furnace;
step 2: when the electric furnace is smelted to the end point, the electric furnace is heated and controlled in temperature, and the end point carbon content of the electric furnace is controlled;
step 3: in the tapping process, an argon blowing flow model of the ladle refining furnace is optimized, the molten steel is ensured to be sufficiently stirred in the process, lime is added into the molten steel along with the flow direction of the steel, aluminum-containing deoxidized alloy is not added in the tapping process, ferrosilicon is not added,
Silicon manganese alloy, only low-carbon ferromanganese is added;
step 4: molten steel enters a ladle refining furnace, slag breaking, temperature measurement, oxygen measurement and sampling are firstly carried out, if the temperature is lower than 1550 ℃, electric power transmission heating is carried out, the electric power transmission temperature is increased to 1580-1600 ℃, and the oxygen content of the molten steel in the ladle refining furnace is controlled to be the same as the temperature
Properly adjusting the bottom blowing argon into the double holes of the ladle refining furnace within the range of 300-500ppm, and taking a molten steel sample after stirring uniformly again after stopping power transmission and heating for 1-2 minutes;
step 5: after the molten steel sample composition is assayed, if the carbon content of the molten steel meets the target requirement, starting to add aluminum ingot for deoxidization, adding modifier, refining slag and lime to make reducing slag, feeding electricity and heating, and carrying out first stirring and desulfurization;
step 6: according to the detected components, aluminum wires are secondarily supplemented for deoxidization and alloying, slag is formed according to slag Kuang Bujia lime fluorite, secondary stirring and desulfurization are carried out, soft blowing is carried out after the component temperature is proper to promote the floating of inclusions, and a calcium wire is fed before steel feeding.
2. The production process of the sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace, which is characterized in that in the step 2, the temperature of the electric furnace is controlled within the range of 1640-1660 ℃ by heating, and the carbon content of the end point of the electric furnace is controlled within the range of 0.04% -0.06%.
3. The production process of the sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace is characterized in that in the step 3, the bottom of a ladle refining furnace is opened for blowing argon in advance for 2 minutes in the tapping process, and the argon flow in the whole tapping process is 30-50nm 3 And/h, ensuring that the molten steel is fully stirred in the process.
4. The production process of the sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace is characterized in that in the step 4, argon is strongly stirred by bottom blowing, and the flow rate of the argon by double-hole bottom blowing is 30-70nm 3 /h。
5. A kind of according to claim 1A process for producing low-carbon low-sulfur aluminum killed steel by continuous casting and rolling of thin plate in electric furnace is characterized in that in step 5, if the carbon content of molten steel is less than 0.045%, aluminum ingot is added for deoxidization according to the oxygen content of molten steel, modifier and refining slag are added after aluminum ingot is melted, lime is added for slagging, the temperature of power transmission and temperature rise is controlled at 1590-1600 ℃, first strong stirring and desulfurization are carried out, and the flow of bottom blowing argon is controlled at 30-70nm 3 /h。
6. The production process of the sheet continuous casting and rolling low-carbon low-sulfur aluminum killed steel electric furnace according to claim 1, wherein in the step 6, an aluminum wire is added to ensure that the aluminum component is in the range of 0.015-0.050%, the slag Kuang Bujia lime is used for alloying, the secondary strong stirring is carried out for 3-4 minutes for desulfurization, and the argon flow is 30-70nm 3 And/h. Soft blowing after proper component temperature promotes the floating of inclusions, and feeding a calcium wire for secondary stirring and desulfurization before steel feeding.
7. The process for producing the low-carbon low-sulfur aluminum killed steel by continuous casting and rolling of the thin plate according to claim 1, wherein the low-carbon low-sulfur aluminum killed steel has a carbon content of less than 0.045%, a sulfur content of less than 0.003% and an AL content of 0.015-0.050%.
Priority Applications (1)
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