CN113600773A - Pouring process of low-oxygen-concentration continuous casting tundish - Google Patents
Pouring process of low-oxygen-concentration continuous casting tundish Download PDFInfo
- Publication number
- CN113600773A CN113600773A CN202110869223.1A CN202110869223A CN113600773A CN 113600773 A CN113600773 A CN 113600773A CN 202110869223 A CN202110869223 A CN 202110869223A CN 113600773 A CN113600773 A CN 113600773A
- Authority
- CN
- China
- Prior art keywords
- tundish
- molten steel
- argon
- continuous casting
- pouring process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000009749 continuous casting Methods 0.000 title claims abstract description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 229910052786 argon Inorganic materials 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000012298 atmosphere Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000002893 slag Substances 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
Images
Classifications
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a pouring process of a continuous casting tundish with low oxygen concentration, which relates to the technical field of steel production. Spiral argon blowing is initiated, a rotary argon airflow atmosphere is formed near a ladle down nozzle and a long nozzle in the pouring process, oxygen suction is controlled to the maximum extent, the purity of molten steel is guaranteed, and secondary pollution is reduced.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a pouring process of a continuous casting tundish with low oxygen concentration.
Background
The continuous casting tundish is a refractory container between a ladle and a crystallizer. Tundish metallurgy has been developed rapidly in recent years in the steel industry in China, and various ladle refining techniques have been developed with increasing requirements for steel quality, aiming at improving the purity of molten steel and cleaning the molten steel. The molten steel refined outside the furnace can be said to be clean, but the molten steel can be polluted after being poured into a tundish. The main performance of foreign inclusions is that the casting is not in place, the existence of the inclusions not only influences the castability of molten steel, but also is difficult to carry out continuous casting operation, and the quality of steel is endangered. The foreign impurities are mainly secondary oxidation products of molten steel in the casting process, most of the foreign impurities are macro-impurities with coarse particles, and in order to ensure the quality of final products, the content of non-metallic impurities in the steel is reduced as much as possible. Practice shows that cracks exist at all parts of the casting blank with inclusions. Therefore, the tundish cannot be regarded as a simple molten steel transfer vessel.
The 'N' of molten steel is increased in the continuous casting production process, the main expression form is caused by incomplete protection casting, so that the rolled product has the defects of hairline, delamination, cracking and the like, and the quality and the fluidity of the molten steel and the recovery rate of alloy elements, particularly the recovery rate of Al and Ca, are reduced.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a pouring process of a low-oxygen-concentration continuous casting tundish, wherein before a ladle is poured, argon is blown in an impact area of the tundish in a spiral argon blowing mode, the argon is sunk into the tundish to be discharged and extrude air in the tundish, spiral closed argon gas mist is formed at the upper part of the liquid level of molten steel in the impact area, a protective sleeve and a ladle water outlet area when the molten steel is poured, and air is isolated from entering the tundish through the protective sleeve and the ladle water outlet, so that the secondary oxidation of the molten steel is reduced.
The technical scheme of the invention is further defined as follows:
the pouring process of the continuous casting tundish with low oxygen concentration is characterized in that spiral argon blowing is carried out 5-10 minutes before the ladle is poured, and a rotary argon airflow atmosphere is formed near a water outlet and a long water outlet of the ladle.
The pouring process of the continuous casting tundish with low oxygen concentration adopts a protection sleeve argon-sealed protection mode to pour molten steel from a steel ladle to the tundish.
In the pouring process of the continuous casting tundish with low oxygen concentration, the covering agent is added into the tundish in the pouring process, and the molten steel in an impact area keeps slightly turning over in the production process, so that the molten steel is strictly prevented from being exposed.
In the pouring process of the continuous casting tundish with low oxygen concentration, the purity of argon is set to be 99.5-99.8%, the pressure of sealed argon is set to be 0.3-0.4MPa, and the flow of an argon blowing device is set to be 150L/min.
According to the pouring process of the continuous casting tundish with low oxygen concentration, when the molten steel amount of the tundish reaches the designed capacity of 2/3, the argon blowing flow of the protective sleeve is adjusted to be 90L/min, a stable argon atmosphere is formed at the upper part of the molten steel surface, and the molten steel cannot be overturned.
The invention has the beneficial effects that:
(1) the method takes the pouring of the tundish with low oxygen concentration as a core, ensures the purity of the molten steel through full-protection pouring, initiates a spiral argon blowing operation method, forms a rotary argon atmosphere near a ladle long nozzle in the pouring process, controls oxygen suction to the maximum extent, improves the purity of the molten steel, finally improves the quality of a casting blank, and successfully solves the problem that the molten steel is secondarily oxidized in the continuous casting pouring and pouring processes;
(2) in the invention, in order to avoid oxidation of molten steel in contact with air in the pouring process, the pouring of the tundish adopts a mode of protecting a sleeve and forming an argon atmosphere by argon sealing and argon blowing in the tundish, which is favorable for preventing secondary oxidation, and the immersion type water gap protection can ensure the purity of the molten steel in the pouring process;
(3) the covering slag has good spreadability, and can isolate air from contacting with molten steel, so that the purity of the molten steel is further improved, the possibility of secondary oxidation of the molten steel is effectively reduced, and the quality of the molten steel is improved.
Drawings
FIG. 1 is a schematic view of a spiral argon blowing apparatus according to the present invention;
wherein: 1. a gas source; 2. a tundish cover; 3. an air intake handle; 4. and (4) blowing the air.
Detailed Description
Example 1
The pouring process of the continuous casting tundish with low oxygen concentration provided by the embodiment comprises the following steps:
before the ladle is cast, argon is blown in an impact area of the tundish through a spiral argon blowing device (shown in figure 1), the tundish argon is filled for 10min, the purity of the argon is set to be 99.8%, the pressure of the sealed argon is set to be 0.4MPa, the flow is set to be 150L/min, and the argon is blown continuously in the production process;
pouring molten steel into a tundish from a steel ladle by adopting a protection sleeve argon seal protection mode, when the tonnage of the tundish reaches 15t, adding a covering agent more than or equal to 150kg from a temperature measuring hole in a first furnace, adding the covering agent more than or equal to 200kg from a sleeve hole at 20t, and then adding the covering agent according to the situation, wherein the total adding amount of the first furnace is more than or equal to 400 kg;
when the molten steel amount of the tundish reaches the designed capacity of 2/3, the flow rate of the protective sleeve is reduced to 90L/min, the molten steel in the impact area is slightly turned over in the production process, and the molten steel is not turned over.
When the tonnage of the tundish is stabilized to be more than 36t, sampling when the ladle molten steel is poured to 80 +/-10 t, randomly sampling and randomly sampling the ladle sample and the gas sample in a furnace 5:
TABLE 1
In example 1, the N increase test from the comparative refining to the continuous casting tundish is carried out, and as can be seen from Table 1, the N increase is 3ppm at most and 0ppm at least, and the N increase of the rest of the heats is between 1 and 2 ppm.
Example 2
The pouring process of the continuous casting tundish with low oxygen concentration provided by the embodiment is different from the pouring process of the continuous casting tundish with low oxygen concentration provided by the embodiment 1 in that: and filling argon in the tundish for 8min, setting the pressure of the sealed argon to be 0.2MPa and setting the flow to be 120L/min.
And (3) taking a tundish sample when the tonnage of the tundish is stabilized to be more than 36t and the ladle molten steel is poured to 80 +/-10 t, and randomly sampling the tundish sample and the gas sample in the 5-furnace:
TABLE 2
In example 2, the tests of increasing N in the comparative refining to continuous casting tundish were carried out, and it can be seen from Table 2 that the N increases were all 4ppm or less.
Example 3
The pouring process of the continuous casting tundish with low oxygen concentration provided by the embodiment is different from the pouring process of the continuous casting tundish with low oxygen concentration provided by the embodiment 1 in that: and filling argon in the tundish for 5min, setting the pressure of the sealed argon to be 0.3MPa and setting the flow to be 100L/min.
And (3) taking a tundish sample when the tonnage of the tundish is stabilized to be more than 36t and the ladle molten steel is poured to 80 +/-10 t, and randomly sampling the tundish sample and the gas sample in the 5-furnace:
TABLE 3
In example 3, comparative refining to continuous casting tundish N increase test was carried out, and it can be seen from Table 3 that the N increase was between 1 and 3 ppm.
As can be seen from tables 1 to 3, the refining to continuous casting tundish protection pouring process has lower occurrence rate of N increase. The filling of argon can rapidly discharge redundant air before the pouring of the tundish is started, a stable argon atmosphere is formed at the upper part of the molten steel surface of the tundish in the production process, a covering agent is added to cover the molten steel surface, and spiral argon gas fog is formed in the area between the protective sleeve and the water outlet of the ladle to prevent air from contacting the molten steel, so that the purity of the molten steel in the pouring process is ensured. Because the purity of the argon gas is higher, the quality of the molten steel can be greatly improved, the secondary oxidation of the molten steel is reduced, and the impurities in the molten steel can float to the maximum extent due to the arrangement of the pressure and the flow, so that the quality of the molten steel can be further improved, and the casting blank has better internal quality.
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 (6)
1. A pouring process of a continuous casting tundish with low oxygen concentration is characterized in that: before the ladle is cast, argon is blown in an impact area of the tundish in a spiral argon blowing mode, the argon sinks into the tundish to be discharged and extrude air in the tundish, spiral closed argon gas mist is formed in the upper part of the liquid level of molten steel in the impact area, the protective sleeve and a ladle water outlet area when molten steel is cast, and air is isolated from entering the tundish through the protective sleeve and the ladle water outlet to reduce secondary oxidation of the molten steel.
2. The low oxygen concentration continuous casting tundish pouring process according to claim 1, wherein: and performing spiral argon blowing 5-10 minutes before the pouring of the ladle, and forming a rotary argon gas flow atmosphere near a ladle down nozzle and a long nozzle.
3. The low oxygen concentration continuous casting tundish pouring process according to claim 1, wherein: and pouring molten steel from the steel ladle to the tundish in an argon sealing protection mode of the protective sleeve.
4. The low oxygen concentration continuous casting tundish pouring process according to claim 1, wherein: and adding a covering agent into the tundish in the pouring process, and keeping the molten steel in an impact area to slightly turn over in the production process, so that the molten steel is strictly prevented from being exposed.
5. The low oxygen concentration continuous casting tundish pouring process according to claim 1, wherein: the purity of the argon is set to be 99.5-99.8%, the pressure of the sealed argon is set to be 0.3-0.4MPa, and the flow of the argon blowing device is set to be 150L/min.
6. The low oxygen concentration continuous casting tundish pouring process according to claim 1, wherein: when the molten steel amount of the tundish reaches the designed capacity of 2/3, the argon blowing flow of the protective sleeve is adjusted to 90L/min, a stable argon atmosphere is formed at the upper part of the molten steel surface, and the molten steel cannot be overturned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110869223.1A CN113600773A (en) | 2021-07-30 | 2021-07-30 | Pouring process of low-oxygen-concentration continuous casting tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110869223.1A CN113600773A (en) | 2021-07-30 | 2021-07-30 | Pouring process of low-oxygen-concentration continuous casting tundish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113600773A true CN113600773A (en) | 2021-11-05 |
Family
ID=78338616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110869223.1A Pending CN113600773A (en) | 2021-07-30 | 2021-07-30 | Pouring process of low-oxygen-concentration continuous casting tundish |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113600773A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457210A (en) * | 2021-12-24 | 2022-05-10 | 浦项(张家港)不锈钢股份有限公司 | Method for controlling purity of tundish molten steel during ladle changing period |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06344098A (en) * | 1993-06-08 | 1994-12-20 | Sumitomo Metal Ind Ltd | Method and device for sealing molten steel pouring flow |
| CN204018701U (en) * | 2014-07-21 | 2014-12-17 | 马钢(集团)控股有限公司 | Continuous casting T shape tundish impact area argon-blowing device |
| CN204075107U (en) * | 2014-10-08 | 2015-01-07 | 舞阳钢铁有限责任公司 | A kind of ingot steel casting argon protective device |
| CN205763829U (en) * | 2016-05-30 | 2016-12-07 | 中原特钢股份有限公司 | A kind of device of continuous casting tundish submerged nozzle argon for protecting pouring |
| CN106270431A (en) * | 2016-08-30 | 2017-01-04 | 山东钢铁股份有限公司 | Promote tundish metallurgy ability and reduce argon-blowing device and the using method of mouth of a river wadding stream |
| CN106881457A (en) * | 2017-03-28 | 2017-06-23 | 马鞍山钢铁股份有限公司 | Molten steel pours device and part is sealed with argon and the method that part carries out argon envelope is sealed using argon |
| CN108067598A (en) * | 2018-01-03 | 2018-05-25 | 河钢股份有限公司承德分公司 | The method for reducing low-carbon low-silicon steel continuous casting head stove nitrogen in steel content |
| CN210125731U (en) * | 2019-03-26 | 2020-03-06 | 宣化钢铁集团有限责任公司 | Immersion type water gap argon sealing protection pouring device |
| CN112317706A (en) * | 2020-09-11 | 2021-02-05 | 南京钢铁股份有限公司 | Argon protection pouring operation method for continuous casting tundish |
-
2021
- 2021-07-30 CN CN202110869223.1A patent/CN113600773A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06344098A (en) * | 1993-06-08 | 1994-12-20 | Sumitomo Metal Ind Ltd | Method and device for sealing molten steel pouring flow |
| CN204018701U (en) * | 2014-07-21 | 2014-12-17 | 马钢(集团)控股有限公司 | Continuous casting T shape tundish impact area argon-blowing device |
| CN204075107U (en) * | 2014-10-08 | 2015-01-07 | 舞阳钢铁有限责任公司 | A kind of ingot steel casting argon protective device |
| CN205763829U (en) * | 2016-05-30 | 2016-12-07 | 中原特钢股份有限公司 | A kind of device of continuous casting tundish submerged nozzle argon for protecting pouring |
| CN106270431A (en) * | 2016-08-30 | 2017-01-04 | 山东钢铁股份有限公司 | Promote tundish metallurgy ability and reduce argon-blowing device and the using method of mouth of a river wadding stream |
| CN106881457A (en) * | 2017-03-28 | 2017-06-23 | 马鞍山钢铁股份有限公司 | Molten steel pours device and part is sealed with argon and the method that part carries out argon envelope is sealed using argon |
| CN108067598A (en) * | 2018-01-03 | 2018-05-25 | 河钢股份有限公司承德分公司 | The method for reducing low-carbon low-silicon steel continuous casting head stove nitrogen in steel content |
| CN210125731U (en) * | 2019-03-26 | 2020-03-06 | 宣化钢铁集团有限责任公司 | Immersion type water gap argon sealing protection pouring device |
| CN112317706A (en) * | 2020-09-11 | 2021-02-05 | 南京钢铁股份有限公司 | Argon protection pouring operation method for continuous casting tundish |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457210A (en) * | 2021-12-24 | 2022-05-10 | 浦项(张家港)不锈钢股份有限公司 | Method for controlling purity of tundish molten steel during ladle changing period |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106957942A (en) | A kind of low carbon low silicon aluminium killed steel that improves directly starts to walk to open the method for pouring success rate | |
| CN112430707B (en) | Method for improving castability of molten low-carbon aluminum killed steel | |
| CN109332625B (en) | Casting method for improving stopper rod flow control Al deoxidized steel nozzle blockage | |
| CN112080700B (en) | High-sulfur low-aluminum free-cutting steel continuous casting slab and production method thereof | |
| CN107805723A (en) | A kind of purifying aluminium alloy melt method | |
| CN101352755A (en) | Equipment and technique for ladle-to-ladle, degasification and vacuum ingot casting of multiple-slide runner ladle | |
| CN113600773A (en) | Pouring process of low-oxygen-concentration continuous casting tundish | |
| CN111390130B (en) | Method for controlling subcutaneous pinhole bubbles of medium-carbon boron-added steel continuous casting billet | |
| CN112317706A (en) | Argon protection pouring operation method for continuous casting tundish | |
| CN106011512A (en) | Four-stage purification technology for magnesium alloy fusant | |
| CN113664171B (en) | Method for controlling quality of continuous casting head blank | |
| CN116422853B (en) | Die steel and continuous casting production method thereof | |
| US9682422B2 (en) | Continuous casting method | |
| CN100448568C (en) | Incorporated manufacturing technique for vacuum steel ladle degassing and vacuum casting a plurality of steel ingots | |
| CN102773442B (en) | Cast-on method for continuously casting half-rimmed steel | |
| CN101486086B (en) | Flat die casting method for silver bullion | |
| CN110079688A (en) | A kind of method of molten aluminum holding furnace automatic refining processing | |
| CN215919083U (en) | Pouring device for low-oxygen-concentration continuous casting tundish | |
| CN111230054A (en) | Method for cleaning slag adhered to bottom of steel ladle | |
| JP2896198B2 (en) | Casting method for steel with excellent resistance to hydrogen-induced cracking | |
| CN111318659B (en) | Method for solving nozzle blockage of high-sulfur free-cutting gear steel produced by continuous casting of small square billets | |
| CN102268515B (en) | Method for purifying steel ingots and relieving A-segregation by using gas | |
| CN115386681B (en) | Method for reducing inclusions in production of 9Ni steel | |
| CN113275529B (en) | Processing method for controlling titanium oxide in titanium-containing alloy steel and tundish adopted by same | |
| JP3631629B2 (en) | Mild steel for strips and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211105 |