CN113817893B - Continuous casting production method of low-silicon high-aluminum sulfur-containing steel - Google Patents
Continuous casting production method of low-silicon high-aluminum sulfur-containing steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 112
- 239000010959 steel Substances 0.000 title claims abstract description 112
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 64
- 238000009749 continuous casting Methods 0.000 title claims abstract description 50
- 239000011593 sulfur Substances 0.000 title claims abstract description 50
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 45
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 35
- 239000010703 silicon Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 36
- 239000011575 calcium Substances 0.000 claims abstract description 25
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 23
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000007670 refining Methods 0.000 claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 14
- 230000023556 desulfurization Effects 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 229910052748 manganese Inorganic materials 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 14
- 230000024121 nodulation Effects 0.000 abstract description 4
- -1 Calcium aluminate Chemical class 0.000 abstract description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910052593 corundum Inorganic materials 0.000 abstract description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 2
- 230000003009 desulfurizing effect Effects 0.000 abstract 2
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018404 Al2 O3 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
-
- 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
-
- 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
-
- 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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- 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 relates to a continuous casting production method of low-silicon high-aluminum sulfur-containing steel, which comprises the steps of firstly adopting a method of firstly desulfurizing and then increasing sulfur in a refining furnace, specifically, firstly desulfurizing to less than 0.003 percent when molten steel is refined, and then firstly feeding a calcium wire and then feeding a sulfur wire to adjust the sulfur content; and then the continuous casting adopts a transitional production method of producing low-sulfur steel grade with wide range of silicon and aluminum by using an open casting first furnace, producing low-silicon sulfur-containing steel grade with wide range of aluminum content by using an open casting second furnace, and producing low-silicon high-aluminum sulfur-containing steel by using an open casting third furnace and a continuous casting furnace. The invention adopts a method that after the conventional deoxidation and desulfurization are carried out by a refining furnace, a calcium wire is firstly added and then a sulfur wire is fed for increasing the sulfur, so that calcium element fed into molten steel is firstly mixed with Al2O3Calcium aluminate is generated through reaction, and then a sulfur line is fed, so that the characteristic that less CaS is generated due to lower free calcium in molten steel is utilized, the continuous casting liquid level fluctuation is effectively controlled, scrappage caused by the fact that the liquid level fluctuation exceeds the standard is reduced, the speed of continuous casting nozzle nodulation is slowed down, the number of continuous casting furnaces is greatly increased, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of steelmaking continuous casting, in particular to a continuous casting production method of low-silicon high-aluminum sulfur-containing steel.
Background
The continuous casting steel is a technological process which utilizes the buffer action of a tundish to continuously cast high-temperature molten steel into one or more metal cavities (crystallizers) which are forced to be water-cooled, and after solidification and forming, the molten steel is cooled for the second time to be solidified into a casting blank with a certain shape (specification).
During specific operation, molten steel flows into a tundish from a ladle and then flows into a crystallizer from the tundish to form an initial blank shell, and the initial blank shell is pulled into a qualified casting blank by a blank pulling machine. The most remarkable characteristics are as follows: because of the buffer action of the molten steel stored in the tundish, the operation of replacing the steel containing barrel can be realized, so that continuous casting can be realized by replacing the next steel containing barrel (containing the next molten steel) after the molten steel in one furnace in the steel containing barrel is poured, and the production efficiency is improved.
The steel for the motor claw pole is a typical steel grade of low-silicon high-aluminum sulfur-containing steel, and with the development of industries such as new energy automobiles, the product quality requirement of the market on the steel for the motor claw pole is continuously improved. The control technology for controlling the liquid level fluctuation of the crystallizer in the continuous casting at present mainly comprises two main categories, one of which is a metering nozzle flow control technology, the method mainly takes measures of adjusting the casting speed and controlling the liquid level height of a tundish, the control precision is not high, and the liquid level fluctuation is more than or equal to +/-5 mm; the second is a stopper rod flow control technology, which adopts the scheme that a stopper rod moves up and down to change the size of steel flow so as to stabilize the liquid level of the crystallizer, and the fluctuation control precision of the liquid level of the crystallizer is less than or equal to +/-3 mm in the method. The fluctuation range of the liquid level of the crystallizer is small, and the condition that large-particle inclusions caused by slag entrapment in the drawing casting process exceed the standard can be avoided, so that the liquid level fluctuation of the crystallizer is stably controlled by adopting a stopper rod flow control technology in the continuous casting when the steel for the claw pole of the motor is produced at present. The steel for the claw pole of the motor comprises, by mass, 0.04-0.07% of main elements C, less than or equal to 0.08% of Si, 0.25-0.40% of Mn, less than or equal to 0.030% of P, 0.018-0.035% of S, 0.02-0.07% of Al, and belongs to the category of low-silicon high-aluminum sulfur-containing steel.
One casting time of high-quality steel produced by continuous casting is about 15 furnaces generally, the high-quality steel from the third furnace to the 15 th furnace is called a continuous casting furnace, secondary oxidation of molten steel cannot be completely avoided although a protective casting technology is adopted during continuous casting and casting of low-silicon high-aluminum sulfur-containing steel, and simultaneously because the Si content in the components of the high-silicon high-aluminum sulfur-containing steel is low, Al generated by a large amount of oxidation of Al in the molten steel in the casting process is generated2O3The nozzle of the stopper rod can be nodulated, thereby causing the liquid level of the crystallizer to fluctuate and even blocking the flow. Another method for controlling the nodulation of continuous casting in the prior art is to feed a large amount of calcium wires into molten steel to ensure that Al generated in a tundish due to secondary oxidation is formed2O3Reacts with Ca to generate calcium aluminate with low melting point, thereby solving the problem of Al2 O3 The problem of water blockage due to accumulation. However, for low-silicon high-aluminum sulfur-containing steel, because the molten steel S is 0.018-0.035%, CaS is generated by feeding calcium wires, and the CaS is accumulated at a stopper water gap to cause nodulation, so that the liquid level of a crystallizer fluctuates or the crystallizer is dead and stops casting.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a continuous casting production method of low-silicon high-aluminum sulfur-containing steel, which aims to solve the problem that a great amount of Al in molten steel of a low-silicon high-aluminum sulfur-containing steel casting furnace is oxidized by Al 2 O3 And the problem of CaS after adding a pure Ca line is solved, so that the liquid level fluctuation caused by the clogging of a stopper nozzle is avoided, and the number of continuous casting furnaces is greatly increased.
The technical scheme adopted by the invention for solving the technical problem is as follows: a continuous casting production method of low-silicon high-aluminum sulfur-containing steel comprises the steps of firstly removing sulfur to be below 0.003 percent during molten steel refining, and then feeding a calcium line and then feeding a sulfur line to adjust the sulfur content; the continuous casting adopts a first furnace for casting to produce low-sulfur steel, a second furnace for casting to produce low-silicon sulfur-containing steel, a third furnace for casting and a subsequent continuous casting furnace to produce low-silicon high-aluminum sulfur-containing steel.
The composition of the three furnaces before casting is controlled as follows:
the continuous casting production method specifically comprises the following steps:
s1, casting the first furnace:
1) and the control requirement of the converter endpoint composition: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) the refining adopts normal deoxidation and desulfurization and component adjustment operation, the components are adjusted to 0.04-0.07 percent of C, 0.08-0.12 percent of Si, 0.25-0.35 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.003 percent of S and 0.020-0.025 percent of Al;
3) feeding calcium wires into the steel ladle according to 2 m of ton steel, and soft blowing for 5 min;
4) feeding a sulfur wire into the ladle to adjust the S content in the molten steel from below 0.003 percent to 0.008 to 0.012 percent;
5) Hoisting the molten steel to a continuous casting ladle, wherein the molten steel comprises 0.04-0.07% of C, 0.08-0.12% of Si, 0.25-0.35% of Mn, not more than 0.025% of P, 0.008-0.012% of S and 0.015-0.023% of Al;
s2, casting a second furnace:
1) and the control requirement of the converter endpoint components: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) normal deoxidation and desulfurization and component adjustment operations are adopted in refining, and the components are adjusted to 0.04-0.07% of C, 0.06-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, less than or equal to 0.003% of S and 0.035-0.045% of Al;
3) feeding calcium wires into the steel ladle according to the volume of 1.5 tons of steel, and carrying out soft blowing for 5 min;
4) feeding a sulfur wire into the molten steel ladle to adjust the S content in the molten steel from below 0.003 percent to 0.018 to 0.025 percent;
5) hoisting the molten steel to a continuous casting start for casting, wherein the molten steel comprises 0.04-0.07% of component C, 0.06-0.08% of component Si, 0.25-0.35% of component Mn, less than or equal to 0.025% of component P, 0.018-0.025% of component S, and 0.033-0.041% of component Al during hoisting;
s3, casting a third furnace:
1) and the control requirement of the converter endpoint composition: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) normal deoxidation and desulfurization and component adjustment operation are adopted in refining, and the components are adjusted to 0.04-0.07% of C, 0.04-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, less than or equal to 0.003% of S and 0.045-0.055% of Al;
3) Feeding calcium wires into the steel ladle according to the ton steel of 1.5 meters, and soft-blowing for 5 min;
4) feeding a sulfur wire into the molten steel ladle to adjust the S content in the molten steel from below 0.003 percent to 0.018 to 0.025 percent;
5) and hoisting the molten steel to a continuous casting station, wherein the molten steel comprises 0.04-0.07% of C, 0.04-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, 0.018-0.025% of S and 0.043-0.051% of Al during ladle hoisting.
In the scheme, the Si and the Al in the molten steel components need three-furnace transition, and the S in the molten steel components needs two-furnace transition.
The invention has the beneficial effects that:
(1) the invention adopts the method that after the conventional deoxidation and desulfurization are carried out by the refining furnace, the calcium wire is firstly added and then the sulfur wire is fed for increasing the sulfur, so that the calcium element fed into the molten steel can be firstly mixed with Al2O3Calcium aluminate is generated by reaction, and then the sulfur wire is fed, so that less CaS is generated in molten steel due to lower free calcium.
(2) The method provided by the invention can effectively control the continuous casting liquid level fluctuation and reduce the scrap caused by the overproof liquid level fluctuation.
(3) The method provided by the invention can effectively slow down the speed of the continuous casting nozzle nodulation, thereby greatly increasing the number of continuous casting furnaces and reducing the production cost.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a graph showing the position of a flow control stopper and the level of molten steel in a mold in the examples.
FIG. 2 is a graph showing the position of a flow control stopper and the level of molten steel in a mold in a comparative example.
Detailed Description
The continuous casting production method of the low-silicon high-aluminum sulfur-containing steel of the invention is specifically explained by the specific embodiment of matching a 120-ton converter with a 160-square continuous casting machine.
The embodiment is as follows:
the method comprises the following specific steps:
1. the first furnace is started to be poured, and the operation process is as follows:
1) the converter end point components C are 0.04 percent and P is 0.018 percent;
2) refining by normal deoxidation and desulfurization and component adjustment operation, wherein the components are adjusted to 0.06 percent of C, 0.10 percent of Si, 0.31 percent of Mn, 0.020 percent of P, 0.002 percent of S and 0.025 percent of Al;
3) feeding 240 m calcium wire into the steel ladle, and soft blowing for 5 min:
4) feeding 100 m sulfur wire into the ladle to adjust the S content in the molten steel to 0.009%;
5) hoisting the molten steel to a continuous casting start ladle, wherein the molten steel comprises 0.06% of C, 0.10% of Si, 0.31% of Mn, 0.020% of P, 0.009% of S and 0.021% of Al during ladle hoisting;
6) and taking a finished product sample in the tundish to observe the aluminum loss, wherein the finished product sample C is 0.06 percent, Si is 0.09 percent, Mn is 0.31 percent, P is 0.020 percent, S is 0.009 percent, and Al is 0.017 percent, and compared with the ladle sample, the continuous casting aluminum loss is 0.004 percent.
2. The second furnace is started to be poured, and the operation process is as follows:
1) the converter end point component C is 0.05 percent, and the P is 0.016 percent;
2) the refining is carried out by normal deoxidation and desulfurization and component adjustment, wherein the components are adjusted to 0.06 percent of C, 0.08 percent of Si, 0.30 percent of Mn, 0.019 percent of P, 0.003 percent of S and 0.036 percent of Al;
3) feeding a calcium wire 180 meters into the steel ladle, and soft-blowing for 5 min;
4) feeding a sulfur wire of 200 meters into the ladle, and adjusting the S content in the molten steel to 0.019%;
5) the molten steel is hoisted to continuous casting and casting, and the molten steel comprises 0.06 percent of C, 0.07 percent of Si, 0.30 percent of Mn, 0.019 percent of P, 0.019 percent of S and 0.034 percent of Al when hoisting;
6) and taking a finished product sample from the tundish to observe the aluminum loss, wherein the finished product sample C is 0.06%, Si is 0.07%, Mn is 0.30%, P is 0.019%, S is 0.019% and Al is 0.033%, and the continuous casting aluminum loss is 0.001% compared with a ladle sample.
3. The third furnace is started to be poured, and the operation process is as follows:
1) the converter end point components C are 0.03% and P is 0.013%;
2) refining by normal deoxidation and desulfurization and component adjustment operation, wherein the components are adjusted to 0.05 percent of C, 0.06 percent of Si, 0.32 percent of Mn, 0.015 percent of P, 0.002 percent of S and 0.049 percent of Al;
3) feeding a calcium wire for 180 meters into the steel ladle and soft-blowing for 5 min;
4) Feeding a sulfur wire of 250 m into the ladle to adjust S in the molten steel to 0.022%;
5) the molten steel is hoisted to continuous casting and initial casting, and the molten steel components C, Si, Mn, P, S and Al are 0.05%, 0.32%, 0.015%, 0.022% and 0.046% respectively when in ladle hoisting;
6) and taking a finished product sample from the tundish to observe the aluminum loss, wherein the finished product sample C is 0.05%, Si is 0.05%, Mn is 0.32%, P is 0.015%, S is 0.019%, Al is 0.043%, and compared with a ladle sample, the continuous casting aluminum loss is 0.003%.
4. The fourteen furnaces are produced in the casting times, the casting curve is shown in figure 1, the position of the stopper rod is stable during casting, and the liquid level is stable without large fluctuation.
Comparative example A:
the method comprises the following specific steps:
1. the first furnace is started to be poured, and the operation process is as follows:
1) the converter end point component C is 0.05 percent, and the P is 0.018 percent;
2) refining is carried out by normal deoxidation and component adjustment (strong desulfurization is not adopted), and the components are adjusted to 0.06 percent of C, 0.06 percent of Si, 0.31 percent of Mn, 0.021 percent of P, 0.006 percent of S and 0.045 percent of Al;
3) sequentially feeding 200 meters of sulfur wire and 240 meters of calcium wire into the steel ladle, and adjusting the S to 0.022%;
4) hoisting the molten steel to a continuous casting start ladle, wherein the molten steel comprises 0.06% of C, 0.06% of Si, 0.31% of Mn, 0.021% of P, 0.022% of S and 0.043% of Al in ladle hoisting;
5) And taking a finished product sample from the tundish to observe the aluminum loss, wherein the finished product sample C is 0.06%, Si is 0.06%, Mn is 0.31%, P is 0.021%, S is 0.022%, and Al is 0.035%, and compared with a ladle sample, the continuous casting aluminum loss is 0.008%.
2. The second furnace is started to be poured, and the operation process is as follows:
1) the converter end point component C is 0.03 percent, and the P is 0.015 percent;
2) the refining was carried out by normal deoxidation and composition adjustment (without intensive desulfurization), and the compositions were adjusted to 0.05% for C, 0.06% for Si, 0.30% for Mn, 0.017% for P, 0.005% for S and 0.046% for Al;
3) sequentially feeding 200 meters of sulfur wire and 180 meters of calcium wire into the steel ladle, and adjusting S to 0.021%;
4) the molten steel is hoisted to continuous casting for casting, and the components of the molten steel during hoisting are 0.05 percent of C, 0.06 percent of Si, 0.30 percent of Mn, 0.017 percent of P, 0.021 percent of S and 0.042 percent of Al;
5) and taking a finished product sample from the tundish to observe the aluminum loss, wherein the finished product sample C is 0.05%, Si is 0.06%, Mn is 0.30%, P is 0.021%, S is 0.021% and Al is 0.040%, and compared with a ladle sample, the continuous casting aluminum loss is 0.002%.
3. The third furnace is started to be poured, and the operation process is as follows:
1) the converter end point component C is 0.04 percent, and the P is 0.015 percent;
2) refining by normal deoxidation and component adjustment (without strong desulfurization), wherein the components are adjusted to 0.05% of C, 0.07% of Si, 0.32% of Mn, 0.017% of P, 0.007% of S and 0.043% of Al;
3) Sequentially feeding 200 meters of sulfur wire and 180 meters of calcium wire into the ladle, and adjusting S to be 0.023%;
4) the molten steel is hoisted to continuous casting for casting, and the components of the molten steel during hoisting are 0.05 percent of C, 0.07 percent of Si, 0.32 percent of Mn, 0.017 percent of P, 0.023 percent of S and 0.040 percent of Al;
5) and taking a finished product sample from the tundish to observe the aluminum loss, wherein the finished product sample C is 0.05 percent, Si is 0.07 percent, Mn is 0.32 percent, P is 0.017 percent, S is 0.023 percent and Al is 0.037 percent, and compared with a ladle sample, the continuous casting aluminum loss is 0.003 percent.
4. The pouring is stopped due to overlarge liquid level fluctuation after the total production of six furnaces in the pouring time, the pouring curve is shown in figure 2, the fluctuation of the liquid level of the two furnaces before the pouring time is large, the opening degree of the stopper rod is fast to rise, and the process stability is poor.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. A continuous casting production method of low-silicon high-aluminum sulfur-containing steel is characterized by comprising the following steps: when molten steel is refined, firstly, sulfur is removed to be below 0.003 percent, then, a calcium line is fed first, then a sulfur line is fed to adjust the sulfur content, continuous casting adopts a first furnace for casting to produce low-sulfur steel, a second furnace for casting to produce low-silicon sulfur-containing steel, a third furnace for casting and a subsequent continuous casting furnace to produce low-silicon high-aluminum sulfur-containing steel, and the method specifically comprises the following steps:
S1, casting a first furnace:
1) and the control requirement of the converter endpoint composition: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) the refining adopts normal deoxidation and desulfurization and component adjustment operation, the components are adjusted to 0.04-0.07 percent of C, 0.08-0.12 percent of Si, 0.25-0.35 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.003 percent of S and 0.020-0.025 percent of Al;
3) feeding calcium wires into the steel ladle according to 2 m of ton steel, and soft blowing for 5 min;
4) feeding a sulfur wire into the molten steel ladle, and adjusting the S content in the molten steel from below 0.003% to 0.008-0.012%;
5) hoisting the molten steel to a continuous casting start, wherein the molten steel comprises 0.04-0.07% of component C, 0.08-0.12% of component Si, 0.25-0.35% of component Mn, less than or equal to 0.025% of component P, 0.008-0.012% of component S and 0.015-0.023% of component Al during ladle hoisting;
s2, casting a second furnace:
1) and the control requirement of the converter endpoint composition: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) normal deoxidation and desulfurization and component adjustment operations are adopted in refining, and the components are adjusted to 0.04-0.07% of C, 0.06-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, less than or equal to 0.003% of S and 0.035-0.045% of Al;
3) feeding calcium wires into the steel ladle according to the ton steel of 1.5 meters, and soft-blowing for 5 min;
4) feeding a sulfur wire into the molten steel ladle to adjust the S content in the molten steel from below 0.003% to 0.018-0.025%;
5) Hoisting the molten steel to a continuous casting start for casting, wherein the molten steel comprises 0.04-0.07% of component C, 0.06-0.08% of component Si, 0.25-0.35% of component Mn, less than or equal to 0.025% of component P, 0.018-0.025% of component S, and 0.033-0.041% of component Al during hoisting;
s3, casting a third furnace:
1) and the control requirement of the converter endpoint composition: c is less than or equal to 0.05 percent and P is less than or equal to 0.020 percent;
2) normal deoxidation and desulfurization and component adjustment operation are adopted in refining, and the components are adjusted to 0.04-0.07% of C, 0.04-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, less than or equal to 0.003% of S and 0.045-0.055% of Al;
3) feeding calcium wires into the steel ladle according to the ton steel of 1.5 meters, and soft-blowing for 5 min;
4) feeding a sulfur wire into the molten steel ladle to adjust the S content in the molten steel from below 0.003% to 0.018-0.025%;
5) and hoisting the molten steel to a continuous casting start for casting, wherein the molten steel comprises 0.04-0.07% of C, 0.04-0.08% of Si, 0.25-0.35% of Mn, less than or equal to 0.025% of P, 0.018-0.025% of S and 0.043-0.051% of Al during ladle hoisting.
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