CN114150101A - Method for producing electroplated tin substrate steel by using ladle casting residual molten steel - Google Patents
Method for producing electroplated tin substrate steel by using ladle casting residual molten steel Download PDFInfo
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- CN114150101A CN114150101A CN202010926068.8A CN202010926068A CN114150101A CN 114150101 A CN114150101 A CN 114150101A CN 202010926068 A CN202010926068 A CN 202010926068A CN 114150101 A CN114150101 A CN 114150101A
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- molten steel
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- argon
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 204
- 239000010959 steel Substances 0.000 title claims abstract description 204
- 238000005266 casting Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000000758 substrate Substances 0.000 title claims abstract description 18
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052786 argon Inorganic materials 0.000 claims abstract description 50
- 238000007664 blowing Methods 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 239000002436 steel type Substances 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 230000001276 controlling effect Effects 0.000 claims description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 9
- 235000012255 calcium oxide Nutrition 0.000 claims description 9
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 claims description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 4
- 238000007670 refining Methods 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for producing electroplated tin substrate steel by using ladle casting residual molten steel, which mainly solves the technical problems of slag inclusion defect and high production cost of the conventional electroplated tin substrate steel. The technical scheme of the invention is as follows: a method for producing electroplated tin substrate steel by using ladle casting residual molten steel comprises the following steps: 1) the converter top and bottom composite smelting is adopted, and the weight percentage of the raw materials added into the metal main material is 78-92 percent of molten iron, and the balance is light scrap steel; 2) conveying the molten steel in the ladle to an argon blowing station, and performing temperature regulation and secondary deoxidation on the molten steel; 3) blowing argon again to the molten steel, adding 5-10 tons of residual molten steel after the same steel type ladle casting into the molten steel in the ladle after the weak stirring treatment, and introducing argon into the molten steel in the ladle to perform strong stirring on the molten steel for 3.0-5.0 minutes; 4) and continuously casting the molten steel to obtain a continuous casting slab. The method has short production period and low cost of the produced molten steel.
Description
Technical Field
The invention relates to a method for producing molten steel, in particular to a method for producing electroplated tin substrate steel by using ladle casting residual molten steel, belonging to the technical field of steelmaking continuous casting.
Background
The application field of the electrotinning steel plate is mainly used for packaging materials, and also has application in the fields of electronics, automobile parts and the like. Besides the food packaging material, various bottle caps, can covers, chemical cans, beverage cans, decorative cans and the like are also widely used.
The production control difficulty of the electrotinning substrate steel is particularly embodied in that the requirement on the purity of the steel is high for the steelmaking process; because the thickness of the finished product steel plate of the electrotinning substrate is thin, the aluminum content of the electrotinning substrate is high, the water gap of the tundish is easy to block in the process of producing continuous casting plate blanks (steel billets) by casting with a continuous casting machine, the electrotinning substrate steel has the defect of slag inclusion, and the degradation rate of the steel plate is high.
In order to avoid the production quality accidents, the prior steel enterprises adopt a refining furnace or an RH vacuum furnace to refine molten steel when producing the electroplated tin substrate steel, so that the production period of the molten steel is long and the production cost is high; although molten steel is refined in a refining furnace or an RH vacuum furnace, there is a problem of inclusion of slag in the steel for the tin-plated substrate.
Disclosure of Invention
The invention aims to provide a method for producing tin-electroplated substrate steel by using ladle casting residual molten steel, which mainly solves the technical problems of slag inclusion defect and high production cost of the existing tin-electroplated substrate steel.
The electroplated tin substrate steel comprises the following chemical components in percentage by weight: c: 0.055-0.085%, less than or equal to 0.035% of Si, Mn: 0.20-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Al: 0.030-0.065%, N is less than or equal to 0.0040%, and the balance is Fe and inevitable impurity elements.
The technical idea of the invention is that the oxygen and carbon contents in the molten steel at the smelting end point of the converter and the slag amount under the converter are controlled; adjusting the quantity of ladle slag modified materials according to the quantity of the converter slag; carrying out component fine adjustment and argon blowing treatment on the molten steel in an argon blowing station; then adding the residual molten steel of the same steel type ladle casting into the molten steel; then, the molten steel is subjected to argon blowing treatment again; continuously casting the molten steel to obtain a continuous casting plate blank, and keeping a constant drawing speed in the molten steel casting process of the continuous casting machine; and when the molten steel in the ladle is 5-10 tons, transferring the residual 5-10 tons of molten steel cast in the ladle to an argon blowing station.
The molten steel is not poured into a ladle of the argon blowing station for reuse.
The invention adopts the technical scheme that the method for producing the electroplated tin substrate steel by using the ladle casting residual molten steel comprises the following steps:
1) the converter top and bottom composite smelting is adopted, and the weight percentage of the raw materials added into the metal main material is 78-92 percent of molten iron, and the balance is light scrap steel;
controlling the smelting end point of the converter, controlling the temperature of molten steel at the smelting end point of the converter to be 1620-1640 ℃, wherein the w [ C ] in the molten steel at the smelting end point of the converter is 0.050-0.080%, w [ O ] is less than or equal to 0.05%, w [ P ] is less than or equal to 0.015%, and w [ S ] is less than or equal to 0.015%;
immediately tapping after converter blowing is finished, and during tapping, argon is blown from the bottom of a ladle in the whole process, wherein the argon flow is 20-40 Nm3When the molten steel amount tapped by the converter reaches 25-35% of the total molten steel amount, firstly, adding an aluminum-iron alloy and a manganese-iron alloy into the molten steel in a ladle at one time to deoxidize the molten steel and initially adjust the molten steel components when the molten steel amount tapped by the converter reaches 25-35% of the total molten steel amount; the addition of the ferromanganese alloy is determined according to the target components of the produced molten steel; the addition amount of the aluminum-iron alloy is 1.6-3.0 kg/ton steel, and the weight percentage of the chemical components of the aluminum-iron alloy is Al 50-60%, Fe 40-50% and the other components are less than or equal to 4%; adding quicklime into the molten steel in the steel ladle to modify the steel ladle slag; the addition amount of the quicklime is 15-20 kg/ton steel, and the chemical components of the quicklime by weight percentage are that CaO is more than or equal to 90 percent and SiO2Less than or equal to 3.5 percent and burning loss less than or equal to 5 percent; after the steel is discharged from the converter, adding a medium aluminum deoxidizer into molten steel in a steel ladle, wherein the adding amount of the medium aluminum deoxidizer is 10-20 kg/ton of steel, and the medium aluminum deoxidizer comprises the following chemical components in percentage by weight of Alt 15-35% and Al2O320～35％、CaO20～35％、CaF2：2～8％、SiO2Less than or equal to 6 percent, less than or equal to 0.1 percent of S and H2O≤1％；
2) Conveying the molten steel in the ladle to an argon blowing station, carrying out temperature regulation and secondary deoxidation on the molten steel, introducing argon into the molten steel in the ladle to carry out strong stirring on the molten steel for 3.0-3.5 minutes, and detecting the free oxygen content and the molten steel temperature in the molten steel in the ladle; after the temperature measurement and the oxygen determination of the molten steel are finished, the temperature of the molten steel is regulated to 1600-1615 ℃, and the flow of argon is controlled to be 15-36 m3H; feeding an aluminum wire into the molten steel to perform secondary deoxidation on the molten steel while strongly stirring the molten steel, and regulating and controlling aluminum and oxygen elements in the molten steel to be target components, wherein the adding amount of the aluminum wire is 0.3-0.6 kg/ton of steel, and the weight percentage content of oxygen in the molten steel is controlled to be 0.002% -0.005%; the strong stirring means that the diameter of the exposed surface of the molten steel in the steel ladle is less than or equal to 200mm in the argon blowing process;
sampling to detect the components of molten steel, when W [ C ] in molten steel]0.055-0.075% w [ Mn]0.3-0.4% w [ P ]]≤0.015％，w[S]≤0.015％，w[Alt]0.040-0.060%, introducing argon gas into the molten steel in the ladle to weakly stir the molten steel for 5-7 min, and controlling the flow of the argon gas to be 3-18 m3H; the weak stirring means that the molten steel in the steel ladle is not exposed in the argon blowing process;
3) and blowing argon again to the molten steel, adding 5-10 tons of residual molten steel after the same steel type ladle casting into the molten steel in the ladle after the weak stirring treatment, introducing argon into the molten steel in the ladle to strongly stir the molten steel for 3.0-5.0 minutes, and controlling the flow of the argon to be 15-36 m3H; the strong stirring means that the diameter of the exposed surface of the molten steel in the steel ladle is less than or equal to 200mm in the argon blowing process;
and introducing argon into the molten steel in the ladle to weakly stir the molten steel for 5-7 min, and controlling the flow of the argon to be 3-18 m3Sampling and detecting the components and temperature of the molten steel, and controlling the temperature of the molten steel to 1585-1600 ℃ to obtain finished molten steel, wherein the temperature of the finished molten steel is wc]0.055-0.075% w [ Mn]0.3-0.4% w [ P ]]≤0.015％，w[S]≤0.015％，w[Alt]0.040-0.060%; the weak stirring means that the molten steel in the steel ladle is not exposed in the argon blowing process;
4) continuously casting the molten steel to obtain a continuous casting plate blank, controlling the interval between the end of the argon blowing treatment of the molten steel and the beginning of the casting of the molten steel to be 15-30 min, controlling the pulling speed of the continuous casting plate blank to be 1.1 +/-0.05 m/min, controlling the residual molten steel of the steel ladle casting to be 5-10 tons, and controlling the chemical components of the continuous casting plate blank in percentage by weight: c: 0.055-0.085%, less than or equal to 0.035% of Si, Mn: 0.20-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Al: 0.030-0.065%, N is less than or equal to 0.0040%, and the balance is Fe and inevitable impurity elements.
The invention steps are repeated, and the production of the tin plate of the next furnace is started.
Furthermore, in the smelting process of the converter, the carbon oxygen product of the converter is controlled to be less than or equal to 0.25 percent.
The method of the invention is based on the following studies of the applicant:
the applicant finds that the top slag in the steel ladle is modified by adding a certain amount of steel ladle slag modification material through controlling the carbon and oxygen discharged from the converter, and then the inclusion in the molten steel can be promoted to float slowly in an argon blowing mode, so that the purity of the molten steel can be improved, the molten steel and slag which are not poured in a continuous casting ladle are poured into the steel ladle subjected to preliminary argon blowing treatment, and further argon blowing treatment is carried out, so that the inclusion in the molten steel can be further promoted to float upwards by utilizing the well-flowing steel ladle slag, and meanwhile, the addition amount of the 1 st modification material can be reduced.
In addition, the residual steel can greatly reduce the probability of slag entrapment during the non-casting period of the continuous casting when the steel is cast by continuous casting, simultaneously, the non-cast molten steel is utilized in a thermal state, the steel-making cost is greatly reduced, compared with the refining treatment of the molten steel by adopting a refining furnace or an RH vacuum furnace, the manufacturing cost of the steel is greatly reduced, and the degradation proportion of the slag inclusion of the continuous casting is reduced by nearly 0.5 percent.
Compared with the prior art, the invention has the following positive effects: 1. the invention reduces the manufacturing cost of steel making, mainly reduces the consumption of ladle top slag materials and electricity consumption and utilizes un-poured hot molten steel and slag compared with the refining treatment of molten steel by adopting a refining furnace or an RH vacuum furnace. 2. The method has the advantages of stable process, short production period and strong continuous casting castability, and the degradation rate of the generated slag inclusion defects is reduced by nearly 0.5 percent compared with the refining treatment of molten steel by adopting a refining furnace or an RH vacuum furnace.
Detailed Description
The invention will be further elucidated with reference to specific examples 1 to 8.
In the embodiment of the invention, a 150-ton top-bottom combined blown converter is used for smelting a steel plate with MR-2 tinplate, and argon is used as bottom blowing gas in the converter smelting process. The production method comprises the following steps: smelting in a converter, processing molten steel in an argon blowing station, and continuously casting the molten steel by a continuous casting machine. The control parameters of the molten steel production of the embodiment of the invention are shown in tables 1 to 6.
TABLE 1 parameters of the converter for smelting metal materials in the examples of the present invention
TABLE 2 composition and temperature of molten steel at the end of converter smelting
TABLE 3 consumption parameters of alloy and auxiliary materials in the tapping process of the converter
TABLE 4 treatment process parameters of argon blowing station before adding residual molten steel in the embodiment of the present invention
TABLE 5 treatment process parameters of argon blowing station after blending residual molten steel in the embodiment of the present invention
TABLE 6 composition and temperature of molten steel at the outlet of argon blowing station
TABLE 7 continuous casting control parameters of the examples of the present invention
TABLE 8 composition of steels of examples of the invention
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A method for producing electroplated tin substrate steel by using ladle casting residual molten steel is characterized by comprising the following steps:
1) the converter top and bottom composite smelting is adopted, and the weight percentage of the raw materials added into the metal main material is 78-92 percent of molten iron, and the balance is light scrap steel;
controlling the smelting end point of the converter, controlling the temperature of molten steel at the smelting end point of the converter to be 1620-1640 ℃, wherein the w [ C ] in the molten steel at the smelting end point of the converter is 0.050-0.080%, w [ O ] is less than or equal to 0.05%, w [ P ] is less than or equal to 0.015%, and w [ S ] is less than or equal to 0.015%;
immediately tapping after converter blowing is finished, and during tapping, argon is blown from the bottom of a ladle in the whole process, wherein the argon flow is 20-40 Nm3When the molten steel amount tapped by the converter reaches 25-35% of the total molten steel amount, firstly, adding an aluminum-iron alloy and a manganese-iron alloy into the molten steel in a ladle at one time to deoxidize the molten steel and initially adjust the molten steel components when the molten steel amount tapped by the converter reaches 25-35% of the total molten steel amount; the addition amount of the manganese-iron alloy is determined according to the target of molten steel productionDetermining according to the score; the addition amount of the aluminum-iron alloy is 1.6-3.0 kg/ton steel, and the weight percentage of the chemical components of the aluminum-iron alloy is 50-60% of Al, 40-50% of Fe and less than or equal to 4% of others; adding quicklime into the molten steel in the steel ladle to modify the steel ladle slag; the addition amount of the quicklime is 15-20 kg/ton steel, and the chemical components of the quicklime by weight percentage are that CaO is more than or equal to 90 percent and SiO2Less than or equal to 3.5 percent and burning loss less than or equal to 5 percent; after the steel is discharged from the converter, adding a medium aluminum deoxidizer into molten steel in a steel ladle, wherein the adding amount of the medium aluminum deoxidizer is 10-20 kg/ton of steel, and the weight percentage of chemical components of the medium aluminum deoxidizer is that Alt 15-35% and Al2O320～35％、CaO 20～35％、CaF2：2～8％、SiO2Less than or equal to 6 percent, less than or equal to 0.1 percent of S and H2O≤1％；
2) Conveying the molten steel in the ladle to an argon blowing station, carrying out temperature regulation and secondary deoxidation on the molten steel, introducing argon into the molten steel in the ladle to carry out strong stirring on the molten steel for 3.0-3.5 minutes, and detecting the free oxygen content and the molten steel temperature in the molten steel in the ladle; after the temperature measurement and the oxygen determination of the molten steel are finished, the temperature of the molten steel is regulated to 1600-1615 ℃, and the flow of argon is controlled to be 15-36 m3H; feeding an aluminum wire into the molten steel to perform secondary deoxidation on the molten steel while strongly stirring the molten steel, and regulating and controlling aluminum and oxygen elements in the molten steel to be target components, wherein the adding amount of the aluminum wire is 0.3-0.6 kg/ton of steel, and the weight percentage content of oxygen in the molten steel is controlled to be 0.002% -0.005%; the strong stirring means that the diameter of the exposed surface of the molten steel in the steel ladle is less than or equal to 200mm in the argon blowing process;
sampling to detect the components of molten steel, when W [ C ] in molten steel]0.055-0.075% w [ Mn]0.3-0.4% w [ P ]]≤0.015％，w[S]≤0.015％，w[Alt]0.040-0.060%, introducing argon gas into the molten steel in the ladle to weakly stir the molten steel for 5-7 min, and controlling the flow of the argon gas to be 3-18 m3H; the weak stirring means that the molten steel in the steel ladle is not exposed in the argon blowing process;
3) and blowing argon again to the molten steel, adding 5-10 tons of residual molten steel after the same steel type ladle casting into the molten steel in the ladle after the weak stirring treatment, introducing argon into the molten steel in the ladle to strongly stir the molten steel for 3.0-5.0 minutes, and controlling the flow of the argon to be 15-36 m3H; the strong stirring means that the diameter of the exposed surface of the molten steel in the steel ladle is less than or equal to 200mm in the argon blowing process;
and introducing argon into the molten steel in the ladle to weakly stir the molten steel for 5-7 min, and controlling the flow of the argon to be 3-18 m3Sampling and detecting the components and temperature of the molten steel, and controlling the temperature of the molten steel to 1585-1600 ℃ to obtain finished molten steel, wherein the temperature of the finished molten steel is wc]0.055-0.075% w [ Mn]0.3-0.4% w [ P ]]≤0.015％，w[S]≤0.015％，w[Alt]0.040-0.060%; the weak stirring means that the molten steel in the steel ladle is not exposed in the argon blowing process;
4) continuously casting the molten steel to obtain a continuous casting plate blank, controlling the interval between the end of the argon blowing treatment of the molten steel and the beginning of the casting of the molten steel to be 15-30 min, controlling the pulling speed of the continuous casting plate blank to be 1.1 +/-0.05 m/min, controlling the residual molten steel of the steel ladle casting to be 5-10 tons, and controlling the chemical components of the continuous casting plate blank in percentage by weight: c: 0.055-0.085%, less than or equal to 0.035% of Si, Mn: 0.20-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Al: 0.030-0.065%, N is less than or equal to 0.0040%, and the balance is Fe and inevitable impurity elements.
2. The method for producing tin-electroplated substrate steel from ladle casting residual molten steel according to claim 1, characterized in that in the converter smelting process, the carbon oxygen product of the converter is controlled to be less than or equal to 0.25%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117587330A (en) * | 2024-01-19 | 2024-02-23 | 江苏省沙钢钢铁研究院有限公司 | High-nitrogen high-purity tinplate and production method thereof |
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