CN116065098A - Method for inhibiting blockage of ultra-low carbon steel pouring nozzle - Google Patents
Method for inhibiting blockage of ultra-low carbon steel pouring nozzle Download PDFInfo
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- CN116065098A CN116065098A CN202211575286.7A CN202211575286A CN116065098A CN 116065098 A CN116065098 A CN 116065098A CN 202211575286 A CN202211575286 A CN 202211575286A CN 116065098 A CN116065098 A CN 116065098A
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- China
- Prior art keywords
- continuous casting
- low carbon
- ultra
- carbon steel
- stopper rod
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 24
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000009749 continuous casting Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 claims abstract 2
- 230000023556 desulfurization Effects 0.000 claims abstract 2
- 238000009628 steelmaking Methods 0.000 claims abstract 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 12
- 150000002910 rare earth metals Chemical class 0.000 abstract description 12
- 238000005266 casting Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010079 rubber tapping Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B22D11/08—Accessories for starting the casting procedure
- B22D11/081—Starter bars
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for inhibiting blockage of an ultra-low carbon steel pouring nozzle. The ultra-low carbon steel comprises the following chemical components in percentage by weight: c:0.001% -0.005%, mn:0.1 to 0.16 percent of Al:0.02% -0.04%, and the balance of Fe and impurities; adopting a process route of molten iron desulfurization, converter steelmaking, molten steel refining and continuous casting; in the continuous casting process, the positive electrode of a direct current power supply is connected to a stopper rod, the negative electrode of the power supply is connected to a copper plate of a crystallizer, and after continuous casting is started, after molten steel of the crystallizer contacts a submerged nozzle, parameters of current are as follows: the current is 2-3A, the voltage is 20-40 KV, and the adhesion of nonmetallic inclusions on the inner wall of the water gap and the stopper rod head is inhibited by direct current. The invention provides a control method for ultra-low carbon steel inclusion, which has the advantages that the used electrode is a self-contained accessory of continuous casting, and the problem of electrode consumption does not exist; secondly, the patent aims at removing the ultra-low carbon steel inclusion, and the control parameters are different from those of rare earth inclusion.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for inhibiting blockage of an ultra-low carbon steel pouring nozzle.
Background
The ultra-low carbon steel is generally used for manufacturing automobiles due to good performances such as strength, and the like, and the surface quality of the steel plate coil for the automobiles is one of important marks for measuring the production level of automobile steel enterprises due to small rolling thickness and very strict requirements on the surface quality of the steel plate coil.
In the production process, the high oxygen content of the molten steel of the converter is necessarily caused by the very low carbon content, and a large amount of nonmetallic inclusion can be generated in the subsequent deoxidation process. In the continuous casting process, the inclusions are easy to adhere to a stopper rod and a water gap, so that the stopper rod is raised in position, and the stability of continuous casting is affected; the falling of the adhesion substances is captured by the solidified shell, or the phenomenon that the liquid level is severely fluctuated to roll slag can influence the inclusion level of the product. Therefore, it is very important to control the inclusion of ultra low carbon steel.
As in the prior art CN109402321a, a method for controlling oxide inclusions in ultra-low carbon steel is disclosed, comprising the steps of: 1) Smelting in a converter to ensure molten steel O during stopping blowing]＝450～600ppm，[C]=0.01-0.05%; the thickness of ladle slag is ensured to be less than or equal to 50mm by tapping, 2.0-5.0kg/t of lime is added in the early stage of tapping, and 0.5-2 kg/t of final Al modifier is added in the early stage of tapping to modify and deoxidize the ladle top slag, so that [ (wt% CaO) + (wt% MgO) in the ladle top slag can be realized]/(wt％Al 2 O 3 ) =1.4 to 1.9, the oxidizing component (wt% FeO) + (wt% MnO). Ltoreq.8; 2) Vacuum decarburization treatment, namely vacuum decarburization treatment in an RH furnace; after the vacuum decarburization treatment is finished, al is added to deoxidize and alloy the molten steel, and the pure circulation time of the molten steel is longer than 6min; then adding rare earth metal Ce, and pure circulating the molten steel for 2-10min, and ending the vacuum treatment. The invention can reduce the harm of inclusions remained in steel, improve the surface quality of the cold-rolled finished product and improve the steel blockage rate of the cold-rolled finished product.
The prior art CN109554605A discloses a method for producing ultra-low carbon steel by an LD-RH processThe oxide inclusion control method comprises the steps of adding 2.0-3.5kg/t of lime into the LD converter at the early stage of tapping, and adding 0.5-1.2 kg/t of Al modifier at the final stage of tapping; then the mixture enters an RH furnace for vacuum treatment and decarburization; and (3) after decarburization, deoxidizing, and adding 0.3-2kg/t of refining agent into steel, wherein the refining agent comprises the following components: caO:50 to 60 weight percent of Al 2 O 3 ：30～40wt％，MgO：2～6wt％，SiO 2 ≤3wt％，TiO 2 O is less than or equal to 0.5wt%; alloying; and circulating the molten steel for 3-12min, and ending the vacuum refining process. The method greatly reduces the oxide inclusion quantity and the oxygen content of the finished product in the casting blank, reduces the cold rolling blockage rate and obviously improves the quality of the ultra-low carbon steel product. The patent is mainly aimed at controlling inclusion in the smelting process, and the continuous casting process is not related.
The prior art CN111906266A discloses a method for inhibiting the blockage of a molten rare earth steel pouring nozzle by using pulse current. The method comprises the steps of inserting electrodes into the rare earth molten steel, applying pulse current to the electrodes by a power supply device, interfering the erosion reaction of the interface between the inner wall of the water gap and the rare earth molten steel by the pulse current, improving the corrosion resistance of the inner wall of the water gap to the rare earth molten steel, and further preventing inclusions in the molten steel from adhering to the inner wall of the water gap. Aiming at the problems that the molten steel in the smelting and casting of the rare earth steel corrodes a water gap and the water gap is blocked by the adhesion of rare earth inclusions, the invention aims to provide a method for inhibiting the blocking of the molten steel casting water gap by using pulse current so as to stabilize the smelting and continuous casting process of the rare earth steel and improve the quality of continuous casting billets.
The technology inhibits the adhesion of inclusions to the submerged nozzle by a pulse power supply so as to stabilize the smelting and continuous casting process of the rare earth steel. However, this patent is mainly directed to rare earth inclusions, and electrodes inserted into a mold are easily eroded by high-temperature molten steel to be continuously consumed, resulting in poor contact, and the insertion depth of the electrodes needs to be continuously adjusted. Meanwhile, when the crystallizer protection slag automatic slag adding equipment is arranged, the equipment is interfered.
Disclosure of Invention
According to the technical problem, a method for inhibiting the blockage of an ultra-low carbon steel pouring nozzle is provided. The invention adopts the following technical means:
a method for inhibiting the blockage of an ultra-low carbon steel pouring nozzle comprises the following chemical components in percentage by weight: c:0.001% -0.005%, mn:0.1 to 0.16 percent of Al:0.02% -0.04%, and the balance of Fe and impurities, adopting a process route of molten iron desulfurization-converter steelmaking-molten steel refining-continuous casting, wherein in the continuous casting process, the anode of a direct current power supply is connected to a stopper rod, the cathode of the power supply is connected to a copper plate of a crystallizer, and after casting is started, parameters of current application after the molten steel of the crystallizer contacts a submerged nozzle are as follows: the current is 2-3A, the voltage is 20-40 KV, and the adhesion of nonmetallic inclusions on the inner wall of the water gap and the stopper rod head is inhibited by the current.
Further, before continuous casting and stopping casting, the power supply of the power supply equipment is turned off.
Further, the stopper rod connecting rod mechanism performs insulation treatment, and a plastic pipeline is adopted to blow argon into the stopper rod.
The invention provides a control method for ultra-low carbon steel inclusion, which has the advantages that the used electrode is a self-contained accessory (copper plate and stopper rod) of continuous casting, and the problem of electrode consumption does not exist; secondly, the patent aims at removing the ultra-low carbon steel inclusion, and the control parameters are different from those of rare earth inclusion. By utilizing the characteristic that the inclusions are positively charged, the positive electrode is arranged on the stopper rod, the negative electrode is arranged on the copper plate, the inclusions are promoted to move from the stopper rod to the copper plate and are captured by the solidified shell, and the stopper rod head and the water gap are prevented from being blocked.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for inhibiting the blockage of an ultra-low carbon steel pouring nozzle comprises the following chemical components in percentage by weight: c:0.001% -0.005%, mn:0.1 to 0.16 percent of Al:0.02% -0.04%, and the balance of Fe and impurities, adopting a molten iron desulfurization-converter steelmaking-molten steel refining-continuous casting process route, wherein the molten steel refining specifically comprises LF refining-RH (VD) refining.
In the continuous casting process, the positive electrode of the direct current power supply is connected to the stopper rod, specifically connected to a stopper rod screw rod, and used for insulating a stopper rod connecting rod mechanism, and argon blowing is carried out on the stopper rod by adopting a plastic pipeline; the negative electrode of the power supply is connected to the copper plate of the crystallizer, and the copper plate is grounded; after continuous casting is started, after molten steel of the crystallizer contacts with a submerged nozzle, a power supply of equipment is turned on, current is applied, and parameters of the applied current are as follows: the current is 2-3A and the voltage is 20-40 KV. And before continuous casting and stopping casting, the power supply of the power supply equipment is turned off. The stopper rod, the water gap and the covering slag of the invention contain carbon and have good conductivity at high temperature. The adhesion of nonmetallic inclusions on the inner wall of the water gap and the stopper rod head is inhibited by current, the blocking of refractory material nodulation is reduced, the continuous casting production is stabilized, and the number of continuous casting furnaces and the quality of casting blanks are improved.
Example 1
In the embodiment, the ultra-low carbon steel adopts M3A30, and the chemical components of the ultra-low carbon steel are as follows by weight percent: finished carbon 0.001%, mn 0.1% and Al 0.02%, and is produced by adopting a molten iron desulfurization-converter steelmaking-LF-RH-continuous casting process.
In a dual-flow slab caster, the No. 1 flow uses direct current and the No. 2 flow slab is a comparative flow, where no current is applied to the comparative flow. The positive electrode of the power supply is connected to a stopper rod screw rod of the No. 1 flow, insulation is made on a stopper rod connecting rod mechanism, and a plastic pipeline is adopted to blow argon to the stopper rod;
the negative electrode of the power supply is connected to the crystallizer copper plate of the No. 1 flow, and the copper plate is grounded;
after continuous casting is started, after molten steel of the crystallizer contacts with a submerged nozzle, direct current is applied, wherein the current is 2A, and the voltage is 20KV.
And before continuous casting and stopping casting, the power supply of the power supply equipment is turned off.
The blocking rate of the water gap of the continuous casting 6 furnaces is 10 percent, and the blocking rate of a No. 2 water gap of the continuous casting 6 furnaces is 60 percent by adopting the traditional method.
Example 2
In the embodiment, the ultra-low carbon steel is M3A32, and the chemical components of the ultra-low carbon steel are as follows in percentage by weight: finished carbon 0.005%, mn:0.16%, al;0.04% of molten iron desulfurization-converter steelmaking-LF-VD-continuous casting process.
In a dual-flow slab caster, the No. 2 flow uses direct current and the No. 1 flow is a comparative flow, where no current is applied to the comparative flow. The positive electrode of the power supply is connected to a stopper rod screw rod of the No. 2 flow, the stopper rod connecting rod mechanism is insulated, and a plastic pipeline is adopted to blow argon to the stopper rod;
the negative electrode of the power supply is connected to a crystallizer copper plate of the No. 2 flow, and the copper plate is grounded;
after continuous casting is started, after molten steel of the crystallizer contacts with a submerged nozzle, current is applied, wherein the current is 3A, and the voltage is 30KV.
And before continuous casting and stopping casting, the power supply of the power supply equipment is turned off.
And the blocking rate of the water gap of the continuous casting 6 furnaces is 8 percent, and the blocking rate of the 1# flow water gap of the traditional method is 65 percent.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. A method for inhibiting the blockage of an ultra-low carbon steel pouring nozzle is characterized by comprising the following chemical components in percentage by weight: c:0.001% -0.005%, mn:0.1 to 0.16 percent of Al:0.02% -0.04%, and the balance of Fe and impurities; adopting a process route of molten iron desulfurization, converter steelmaking, molten steel refining and continuous casting; in the continuous casting process, the positive electrode of a direct current power supply is connected to a stopper rod, the negative electrode of the power supply is connected to a copper plate of a crystallizer, and after continuous casting is started, after molten steel of the crystallizer contacts a submerged nozzle, parameters of current are as follows: the current is 2-3A, the voltage is 20-40 KV, and the adhesion of nonmetallic inclusions on the inner wall of the water gap and the stopper rod head is inhibited by direct current.
2. The method for suppressing clogging of ultra low carbon steel pouring gate as recited in claim 1, wherein power supply device power is turned off before continuous casting stop pouring.
3. The method for suppressing clogging of an ultra low carbon steel pouring nozzle as recited in claim 1, wherein the stopper rod linkage is insulated, and argon is blown to the stopper rod by a plastic pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575286.7A CN116065098A (en) | 2022-12-08 | 2022-12-08 | Method for inhibiting blockage of ultra-low carbon steel pouring nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575286.7A CN116065098A (en) | 2022-12-08 | 2022-12-08 | Method for inhibiting blockage of ultra-low carbon steel pouring nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116065098A true CN116065098A (en) | 2023-05-05 |
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ID=86169120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211575286.7A Pending CN116065098A (en) | 2022-12-08 | 2022-12-08 | Method for inhibiting blockage of ultra-low carbon steel pouring nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116065098A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009120108A1 (en) * | 2008-03-28 | 2009-10-01 | Volkov Anatoly Evgenievich | Method for producing chemically active metals and slag recovery and a device for carrying out said method |
| CN111906266A (en) * | 2020-08-21 | 2020-11-10 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
| CN114082910A (en) * | 2021-11-25 | 2022-02-25 | 山东钢铁股份有限公司 | Method for inhibiting water gap from being blocked |
-
2022
- 2022-12-08 CN CN202211575286.7A patent/CN116065098A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009120108A1 (en) * | 2008-03-28 | 2009-10-01 | Volkov Anatoly Evgenievich | Method for producing chemically active metals and slag recovery and a device for carrying out said method |
| CN111906266A (en) * | 2020-08-21 | 2020-11-10 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
| CN114082910A (en) * | 2021-11-25 | 2022-02-25 | 山东钢铁股份有限公司 | Method for inhibiting water gap from being blocked |
Non-Patent Citations (1)
| Title |
|---|
| 孙勇等: "加电场对连铸水口防堵塞性能的影响", 连铸, no. 6, 15 December 2008 (2008-12-15), pages 11 - 13 * |
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