CN115156492B - Tundish covering agent for high-clean steel IF steel continuous casting process and adding method thereof - Google Patents
Tundish covering agent for high-clean steel IF steel continuous casting process and adding method thereof Download PDFInfo
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- CN115156492B CN115156492B CN202210682377.4A CN202210682377A CN115156492B CN 115156492 B CN115156492 B CN 115156492B CN 202210682377 A CN202210682377 A CN 202210682377A CN 115156492 B CN115156492 B CN 115156492B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 21
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 83
- 238000001179 sorption measurement Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000006184 cosolvent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a tundish covering agent in a high-clean steel IF steel continuous casting process and an adding method thereof. The initial covering agent comprises (wt%): caO:40.0 to 50.0, baO:10.0 to 12.0, mgO:11.0 to 15.0 percent of SiO 2 ：2～4，Al 2 O 3 ：20.0～24.0，Li 2 CO 3 ：1.0～3.0，CaF 2 ：0.8～1.2，FeO+MnO<1, etc.; the modified covering agent comprises (wt%): caO: 62-72, baO:6 to 10, mgO:6 to 10 percent of SiO 2 ：1～3，Al 2 O 3 ：5～9，Li 2 CO 3 ：3～5，CaF 2 ：1.8～2.2，FeO+MnO<1, etc.; according to the invention, the initial covering agent is added in the initial casting stage, and the modified covering agent is added in the middle casting stage, so that the purity of molten steel in the IF steel production process is improved.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a tundish covering agent in a high-clean steel IF steel continuous casting process and an adding method thereof.
Background
IF steel is also called interstitial free steel, has carbon content of 0.002% -0.006%, has excellent deep drawing performance, and is widely used for manufacturing automobile and household appliance panels and the like. In order to meet the surface quality requirement of the panel, the purity of the IF steel needs to be strictly controlled, and the surface quality defects of the panel such as streaks and the like formed by inclusions in the steel in the rolling process are avoided.
In the IF steel continuous casting process, the tundish is used as a continuous casting machine key metallurgical vessel, and plays a key role in improving the purity of molten steel. Wherein, the tundish covering agent plays important roles of heat preservation, air isolation and adsorption inclusion in the continuous casting process. Therefore, the reasonable tundish covering agent can effectively reduce secondary oxidation of molten steel, improve the efficiency of floating inclusions in the molten steel into the tundish covering agent, and improve the purity of the molten steel.
The covering agents can be generally classified into acidic, neutral and alkaline ones, and the basicity R (CaO/SiO 2) of the acidic covering agent<0.5, neutral covering agent R=0.5-1.5, alkaline covering agent R>1.5. The alkaline covering agent has obvious advantages compared with other types of covering agents: (1) increasing Al in molten steel by tundish covering agent 2 O 3 、SiO 2 Adsorption removal ability of inclusion-like substances; (2) the erosion of the tundish refractory is reduced; (3) reducing the sulfur recovery of ladle molten steel; (4) reducing the oxidizing property of the tundish covering agent. Thus, most of the currently commonly used tundish covering agents belong to the alkaline covering agents, such as patent CN101347823A, CN103372636A, CN103639383A, CN104858381A, CN106041007A, CN107052289A, CN111001768B.
Although the currently commonly used alkaline covering agent can basically meet the production requirement, certain defects still exist in the production of steel types with strict purity requirements such as IF steel: (1) currently, the alkalinity R of an alkaline covering agent is generally less than 10, and the adsorption removal capability of the alkaline covering agent on impurities is limited; (2) the currently used covering agent is usually added in a first furnace of a tundish casting, and the covering agent is rarely added in the subsequent production process. However, in the subsequent heat casting process, as the inclusions in the molten steel float up into the tundish covering agent, the performance of the tundish covering agent can be obviously changed, so that the capability of the covering agent for adsorbing the inclusions is obviously reduced, and the subsequent heat molten steel inclusion floating up is not facilitated.
Disclosure of Invention
In order to solve the technical problems and effectively improve the purity of molten steel in the IF steel production process, the invention provides a high-clean steel IF steel continuous casting processThe tundish covering agent and the adding method thereof can effectively improve the effect of the tundish covering agent on the IF steel Al on the basis of effectively playing the basic roles of heat preservation of the covering agent, avoiding secondary oxidation caused by contact of molten steel with air and the like 2 O 3 The impurity adsorption removal capability is improved obviously, the purity of molten steel is improved obviously, and the impurity degradation rate of the automobile plate is reduced in use.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides an IF steel continuous casting tundish initial covering agent which comprises the following components in percentage by mass:
CaO：40.0～50.0％，BaO：10.0～12.0％，MgO：11.0～15.0％，SiO 2 ：2～4％，Al 2 O 3 ：20.0～24.0％，Li 2 CO 3 ：1.0～3.0％，CaF 2 ：0.8～1.2％，FeO+MnO：<1.0％，C：<1.0％，H 2 O：<0.5%, the balance being unavoidable impurities.
In the above technical scheme, further, the melting point of the initial covering agent is 1200-1400 ℃.
In the technical scheme, further, the granularity of the initial covering agent is less than or equal to 3mm.
In the above technical scheme, further, the alkalinity R of the initial covering agent is 15-20.
The invention further provides an IF steel continuous casting tundish modifying covering agent, which comprises the following components in percentage by mass:
CaO：62.0～72.0％，BaO：6.0～10.0％，MgO：6.0～10.0％，SiO 2 ：1.0～3.0％，Al 2 O 3 ：5.0～9.0％，Li 2 CO 3 ：3.0～5.0％，CaF 2 ：1.8～2.2％，FeO+MnO：<1.0％，C：<1.0％，H 2 O：<0.5%, the balance being unavoidable impurities.
In the above technical scheme, further, the melting point of the modified covering agent is 1400-1600 ℃.
In the technical scheme, further, the granularity of the modified covering agent is less than or equal to 5mm.
In the above technical scheme, further, the alkalinity R of the modified covering agent is 30-38.
The invention also provides a method for adding the covering agent into the IF steel continuous casting tundish, which comprises the following steps:
the initial covering agent of the solid tundish is added when the molten steel reaches the working liquid level of the tundish in the initial pouring stage of the tundish (namely, the first furnace is started to be poured); the aforementioned molten tundish modifying covering agent is added during the mid-tundish casting period (i.e., when the tundish is continuously cast about half the number of furnaces).
In the above technical scheme, further, the adding amount of the tundish initial covering agent is as follows: after the initial covering agent of the tundish is melted, the thickness of the covering agent uniformly spread on the surface of molten steel is 10-15 mm;
the adding amount of the tundish modifying covering agent is 1/3-1/2 of the adding amount of the initial covering agent.
In the above technical scheme, further, the positions of adding the initial covering agent of the tundish and the modifying covering agent of the tundish are both the tundish impact area and the casting area.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention replaces part of CaO with BaO, the alkalinity of the covering agent is enhanced, the alkalinity R of the initial covering agent reaches over 10 ultrahigh alkalinity, and the adsorption inclusion capacity is obviously improved.
(2) The invention effectively reduces the melting point of the initial covering agent under the condition of ultrahigh alkalinity, ensures the slagging performance of the initial covering agent after being added into a tundish, improves the spreadability of the initial covering agent after being added into the tundish, adopts Li 2 CO 3 Replace part of the traditional cosolvent CaF 2 。Li 2 CO 3 Decomposing at high temperature to form Li 2 O and CO 2 ，Li 2 O is used as a strong cosolvent to effectively reduce the melting point of the ultra-high alkalinity initial covering agent and simultaneously decompose the generated CO 2 The spreading of the covering agent added into the tundish is facilitated, and the rapid covering effect of the covering agent on molten steel is improved.
(3) According to the invention, a certain amount of initial solid covering agent is added into the first pouring ladle casting furnace, so that molten steel inclusions in the earlier pouring ladle casting period are removed through high-efficiency adsorption, and the molten liquid pouring ladle modifying covering agent is added into the middle pouring ladle casting period after a certain number of pouring ladles are poured, so that the performance deterioration of primary slag in the middle pouring ladle casting period caused by a large amount of adsorbed inclusions is effectively improved, and the higher inclusion adsorption capacity of the primary slag is continuously maintained.
Detailed Description
The invention is further illustrated below in connection with specific examples, but is not limited in any way.
Taking two-stream 70-ton tundish continuous casting 4 packs (6 furnaces per pack) of high-cleanliness IF steel as an example, the 1 st pack adopts the existing covering agent, and the following 3 packs adopt the covering agent disclosed by the invention, and the specific steps are as follows:
(1) When the ladle molten steel reaches the ladle working liquid level of 900mm, 420kg of the existing covering agent is added into the tundish impact area through the baking hole of the ladle cover, 290kg of the existing covering agent is respectively added into the casting areas at the two sides, the thickness of the molten covering agent uniformly spread between the impact area and the casting areas at the two sides is about 12mm, the components and the performances of the existing covering agent are shown in the table 1, and the covering agent is not added into the subsequent heat.
TABLE 1 Components (wt%) and Properties of the existing covering agent added in 1 st pack
(2) And (2) to (4) packaging times, when the first furnace is started for each packaging time and the liquid steel of the tundish reaches the working liquid level of the tundish, 300kg of the initial covering agent of the invention is added into the impact area of the tundish through the baking hole of the ladle cover, 200kg of the initial covering agent of the invention is respectively added into the casting areas at two sides, the thickness of the molten covering agent uniformly spread between the impact area and the casting areas at two sides is about 12mm, and the components and the performances of the initial covering agent of the invention added into each packaging time are respectively shown in tables 2 to 4.
TABLE 2 composition (wt%) and Properties of the initial covering agent of the invention added in the 2 nd pack
TABLE 3 composition (wt%) and Properties of the initial covering agent of the invention added in the 3 rd pack
TABLE 4 composition (wt%) and Properties of the initial covering agent of the invention added in the 4 th pack
(3) In the process of casting the 2 nd to 4 th ladle times, 300kg of medium ladle modifying and covering agent is melted by an induction furnace at 1600 ℃, and the components and performances of the 2 nd to 4 th ladle modifying and covering agent are shown in tables 5 to 7 respectively.
TABLE 5 modified covering agent composition (wt%) and Properties of the 2 nd pack tundish
TABLE 63 th pack tundish modified covering agent composition (wt%) and Properties
TABLE 7 3 th pack tundish modified covering agent composition (wt%) and Properties
(4) And (2) pouring the 4 th furnace after each of the 2 nd to 4 th ladle times, and adding the molten tundish modifying covering agent into the tundish through a ladle cover baking hole when the liquid level of the tundish returns to 1600mm of the working liquid level, wherein 120kg of the molten modifying covering agent is added into an impact area, and 90kg of the molten modifying covering agent is respectively added into casting areas at two sides.
Table 8 compares the process effects of the disclosed coating agents before application (1 st pack) and after application (2 nd to 4 th pack). Compared with the existing covering agent, the nitrogen of the ladle molten steel is increased by 1.5 multiplied by 10 after the covering agent is adopted -6 Reduced to 0.9X10 -6 ～1×10 -6 The covering agent is obviously improved in the effect of isolating air and protecting molten steel from secondary oxidation. The total oxygen of casting blank is 10 multiplied by 10 -6 Down to 8.2×10 -6 ～9×10 -6 The density of inclusion in casting blank is 4.1/mm 2 Reduced to 3.1 to 3.5 pieces/mm 2 It is explained that the efficiency of removing impurities from molten steel by adsorption is enhanced by the covering agent of the present invention. In the casting process, the average temperature of molten steel in each furnace of the tundish is reduced from 8 ℃ to 7-7.4 ℃, which shows that the heat preservation effect of the covering agent is improved.
Table 8 comparison of the effects of high cleanliness IF Steel tundish covering agent before and after application
Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The adding method of the IF steel continuous casting tundish covering agent is characterized by comprising the following steps:
at the initial stage of pouring the tundish, when the molten steel reaches the working liquid level of the tundish, adding a solid-state tundish initial covering agent; adding a molten tundish modifying covering agent in the middle of tundish casting;
the tundish initial covering agent comprises the following components in percentage by mass: caO:40.0 to 50.0 percent of BaO:10.0 to 12.0 percent, mgO:11.0 to 15.0 percent, siO 2 ：2～4％，Al 2 O 3 ：20.0～24.0％，Li 2 CO 3 ：1.0～3.0％，CaF 2 ：0.8～1.2％，FeO+MnO：<1.0％，C：<1.0％，H 2 O：<0.5%, the balance being unavoidable impurities;
the tundish modifying covering agent comprises the following components in percentage by mass: caO:62.0 to 72.0 percent of BaO:6.0 to 10.0 percent, mgO:6.0 to 10.0 percent of SiO 2 ：1.0～3.0％，Al 2 O 3 ：5.0～9.0％，Li 2 CO 3 ：3.0～5.0％，CaF 2 ：1.8～2.2％，FeO+MnO：<1.0％，C：<1.0％，H 2 O：<0.5%, the balance being unavoidable impurities.
2. The method for adding the IF steel continuous casting tundish covering agent according to claim 1, wherein the melting point of the initial covering agent is 1200-1400 ℃; the granularity of the initial covering agent is less than or equal to 3mm.
3. The method for adding the IF steel continuous casting tundish covering agent according to claim 1, wherein the basicity R of the initial covering agent is 15-20.
4. The method for adding the IF steel continuous casting tundish covering agent according to claim 1, characterized in that the melting point of the modified covering agent is 1300-1500 ℃; the granularity of the modified covering agent is less than or equal to 5mm.
5. The method for adding the IF steel continuous casting tundish covering agent according to claim 1, wherein the alkalinity R of the modified covering agent is 30-38.
6. The addition method according to claim 1, wherein the addition amount of the tundish initial covering agent is: after the initial covering agent of the tundish is melted, the thickness of the covering agent uniformly spread on the surface of molten steel is 10-15 mm;
the adding amount of the tundish modifying covering agent is 1/3-1/2 of the adding amount of the initial covering agent.
7. The addition method according to claim 1, wherein the initial covering agent of the tundish and the modifying covering agent of the tundish are added at the tundish impact zone and the casting zone.
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| Application Number | Priority Date | Filing Date | Title |
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