CN115156492A - Tundish covering agent in high-cleanliness steel IF steel continuous casting process and adding method thereof - Google Patents
Tundish covering agent in high-cleanliness steel IF steel continuous casting process and adding method thereof Download PDFInfo
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- CN115156492A CN115156492A CN202210682377.4A CN202210682377A CN115156492A CN 115156492 A CN115156492 A CN 115156492A CN 202210682377 A CN202210682377 A CN 202210682377A CN 115156492 A CN115156492 A CN 115156492A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000009749 continuous casting Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 20
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 8
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 100
- 239000012535 impurity Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 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
- 239000011248 coating agent Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 2
- 230000001976 improved effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 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
- 238000004321 preservation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000006184 cosolvent Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 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
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a tundish covering agent in a high-cleanliness 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 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 modifying covering agent comprises (wt%): caO:62 to 72, baO:6 to 10, mgO:6 to 10 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 molten steel purity 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 high-cleanliness tundish covering agent in a steel IF steel continuous casting process and an adding method thereof.
Background
IF steel is also called interstitial free steel, has a carbon content of 0.002% -0.006%, has excellent deep drawing performance, and is widely used for manufacturing panels of automobiles and household electrical appliances. 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 streak 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 key metallurgical container of a continuous casting machine, and plays a key role in improving the purity of molten steel. Wherein, the tundish covering agent plays an important role in heat preservation, air isolation and impurity adsorption in the continuous casting process. Therefore, the reasonable tundish covering agent can effectively reduce the secondary oxidation of molten steel, improve the efficiency of impurities in the molten steel floating up to enter the tundish covering agent and improve the purity of the molten steel.
The covering agent can be generally classified into three types, i.e., acidic, neutral and alkaline, 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 content in molten steel by tundish covering agent 2 O 3 、SiO 2 The adsorption removal capacity of the similar impurities; (2) the corrosion of the refractory material of the tundish is reduced; (3) reducing resulfurization of the molten steel in the tundish; (4) reducing the oxidability of the tundish covering agent. Therefore, most of the currently commonly used tundish covering agents belong to alkaline covering agents, such as patents CN101347823A, CN103372636A, CN103639383A, CN104858381A, CN106041007A, CN107052289A and CN111001768B.
Although the currently widely used alkaline covering agents substantially meet the production requirements, there are certain disadvantages in the production of IF steel, which is a steel grade with strict purity requirements: (1) at present, the alkalinity R of the alkaline covering agent is usually less than 10, and the adsorption and removal capacity of the alkaline covering agent on the impurities is limited; (2) the covering agent adopted currently is added in a first furnace of the tundish, and the covering agent is rarely added in the subsequent production process. However, in the subsequent heat casting process, as the inclusion in the molten steel floats upwards and enters 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 and inclusion is obviously reduced, and the floating removal of the inclusion in the molten steel in the subsequent heat 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-purity IF steelThe tundish covering agent for the continuous casting process of the clean steel IF steel and the adding method thereof can effectively improve the Al content of the tundish covering agent to the IF steel on the basis of effectively playing the basic functions of heat preservation of the covering agent, avoiding secondary oxidation caused by contact between molten steel and air and the like 2 O 3 The adsorption and removal capacity of the inclusions is equal, the purity of the molten steel is obviously improved, and the degradation rate of the inclusions of the automobile sheet is reduced in use.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides an IF steel continuous casting tundish initial covering agent which comprises the following components in parts 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 percent, and the balance of inevitable impurities.
In the above technical solution, further, the melting point of the initial covering agent is 1200 to 1400 ℃.
In the above technical solution, further, the particle size of the initial covering agent is less than or equal to 3mm.
In the above technical solution, further, the alkalinity R of the initial covering agent is 15 to 20.
The invention also 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 percent, and the balance of inevitable impurities.
In the above technical solution, further, the melting point of the modifying covering agent is 1400 to 1600 ℃.
In the above technical scheme, further, the particle size of the modifying covering agent is less than or equal to 5mm.
In the above aspect, the basicity R of the modifying coating agent is further 30 to 38.
The invention also provides an adding method of the IF steel continuous casting tundish covering agent, which comprises the following steps:
in the initial casting stage of the tundish (namely, the first furnace is cast), when the molten steel reaches the working liquid level of the tundish, adding the solid tundish initial covering agent; the molten modifying and covering agent for the tundish is added during the middle stage of the tundish casting (i.e., when the tundish is continuously cast for about half of the number of furnaces).
In the above technical solution, further, the amount of the initial covering agent added to the tundish is: after the initial covering agent of the tundish is melted, the covering agent is uniformly spread on the surface of the molten steel to form a layer with the thickness of 10-15 mm;
the addition amount of the tundish modifying covering agent is 1/3-1/2 of the addition amount of the initial covering agent.
In the above technical solution, further, the positions where the tundish initial covering agent and the tundish modifying covering agent are added are both a tundish impact region and a casting region.
Compared with the prior art, the invention has the beneficial effects that:
(1) In the invention, baO replaces part of CaO, the alkalinity of the covering agent is enhanced, the alkalinity R of the initial covering agent reaches over 10 of ultrahigh alkalinity, and the adsorption and inclusion capacity of the covering agent is obviously improved.
(2) In order to effectively reduce the melting point of the initial covering agent under the condition of ultrahigh alkalinity, ensure the slagging performance of the initial covering agent after being added into a tundish and simultaneously improve the spreading performance of the initial covering agent after being added into the tundish, the invention adopts Li 2 CO 3 Replace part of the traditional cosolvent CaF 2 。Li 2 CO 3 Decomposition at high temperature to form Li 2 O and CO 2 ，Li 2 The O as a strong cosolvent can effectively reduce the melting point of the initial covering agent with ultrahigh alkalinity, and simultaneously decompose the generated CO 2 The covering agent added into the tundish is promoted to spread, and the quick 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 furnace for pouring the tundish, molten steel inclusions in the early casting period of the tundish are efficiently adsorbed and removed, and the molten liquid modified covering agent is added into the first furnace for pouring the tundish after a certain number of furnaces, so that the performance deterioration caused by a large amount of adsorbed inclusions in the initial slag in the middle casting period of the tundish is effectively improved, and the high inclusion adsorption capacity of the initial slag is continuously maintained.
Detailed Description
The invention is further illustrated, but is not in any way limited, by the following specific examples.
Taking two-flow 70-ton tundish continuous casting 4-ladle-time (6 furnaces per ladle) high-cleanliness IF steel as an example, the 1 st ladle time adopts the existing covering agent, and the subsequent 3 ladle times adopts the covering agent disclosed by the invention, specifically:
(1) The first furnace is cast in the 1 st ladle time, when the working liquid level of the tundish reaches 900mm, 420kg of the existing covering agent is added into the impact area of the tundish through the baking hole of the ladle cover, 290kg of the existing covering agent is added into the casting areas at two sides respectively, the thickness of the molten covering agent uniformly spread in the impact area and the casting areas at two sides is about 12mm, the components and the performance of the existing covering agent are shown in the table 1, and the covering agent is not added in the subsequent furnace times.
TABLE 1 ingredients (wt%) and Properties of the prior art coverlays added in package 1
(2) And 2, pouring the first furnace for each ladle from the 2 nd ladle to the 4 th ladle, adding 300kg of the initial covering agent to the impact area of the tundish through a baking hole of the ladle cover when the molten steel in the tundish reaches the working liquid level of the tundish of 900mm, adding 200kg of the initial covering agent to the casting areas on two sides respectively, wherein the thickness of the molten covering agent uniformly spread in the impact area and the casting areas on two sides is about 12mm, and the components and the performance of the initial covering agent added for each ladle are respectively shown in tables 2 to 4.
TABLE 2 ingredients (wt%) and Properties of the initial covering agent of the invention added in package 2
TABLE 3 ingredients (wt%) and Properties of 3 rd package of initial covering agent of the present invention
TABLE 4 ingredients (wt%) and Properties of the 4 th package of initial covering agent of the present invention
(3) In the casting process of each ladle from the 2 nd ladle to the 4 th ladle, 300kg of the modifying covering agent in the ladle is melted by an induction furnace at 1600 ℃, and the components and the performances of the modifying covering agent of the 2 nd ladle to the 4 th ladle are respectively shown in tables 5 to 7.
TABLE 5 ladle 2 modifier overlay agent composition (wt%) and Properties
TABLE 6 fraction (wt%) and properties of ladle quality-improving covering agent for 3 rd ladle
TABLE 7 ingredient (wt%) and properties of 3 rd ladle tundish modifying coating agent
(4) And (3) starting to cast the furnace 4 in each of the 2 nd to 4 th ladle times, adding the molten modifying covering agent into the tundish through a ladle cover baking hole when the liquid level of the tundish returns to the working liquid level of 1600mm, wherein 120kg of the molten modifying covering agent is added into an impact area, and 90kg of the molten modifying covering agent is added into casting areas on two sides.
Table 8 compares the process effect of the coverlays disclosed herein before application (1 st package) and after application (2 nd to 4 th packages). Compared with the existing covering agent, after the covering agent is adopted, nitrogen increase of the molten steel in the tundish is from 1.5 multiplied by 10 -6 Reduced to 0.9 × 10 -6 ～1×10 -6 It is demonstrated that the covering agent of the present invention has obviously improved effects of isolating air and protecting molten steel from secondary oxidation. Total oxygen content of casting blank is 10X 10 -6 Down to 8.2X 10 -6 ～9×10 -6 The density of the casting blank inclusions is 4.1/mm 2 Reduce the number of the particles to 3.1 to 3.5/mm 2 It is demonstrated that the covering agent of the present invention enhances the efficiency of removing impurities adsorbed in molten steel. 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 Effect before and after application of high-cleanliness IF Steel tundish covering agent
It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (9)
1. An initial covering agent for an IF steel continuous casting tundish is characterized by comprising the following components in parts 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 percent, and the balance of unavoidable impurities.
2. The initial covering agent for an IF steel continuous casting tundish according to claim 1, wherein the melting point of the initial covering agent is 1200 to 1400 ℃; the particle size of the initial covering agent is less than or equal to 3mm.
3. The initial covering agent for an IF steel continuous casting tundish according to claim 1, wherein the basicity R of the initial covering agent is 15 to 20.
4. The modifier covering agent for the IF steel continuous casting tundish is characterized by comprising the following components in parts 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 percent, and the balance of inevitable impurities.
5. The modifying covering agent for the IF steel continuous casting tundish according to claim 4, wherein the melting point of the modifying covering agent is 1300-1500 ℃; the particle size of the modifying covering agent is less than or equal to 5mm.
6. The modifying coating agent for an IF steel continuous casting tundish according to claim 4, wherein the basicity R of the modifying coating agent is 30-38.
7. A method for adding an IF steel continuous casting tundish covering agent is characterized by comprising the following steps:
adding the solid tundish initial covering agent of claim 1 at the initial casting stage of the tundish when the molten steel reaches the working liquid level of the tundish; adding the molten tundish modifying coating agent of claim 4 during the mid-casting period of the tundish.
8. The addition method according to claim 7, wherein the amount of the tundish initial covering agent added is: after the initial covering agent of the tundish is melted, the thickness of the covering agent uniformly spread on the surface of the molten steel is 10-15 mm;
the addition amount of the tundish modifying covering agent is 1/3-1/2 of the addition amount of the initial covering agent.
9. The addition process according to claim 7, wherein the locations of the tundish initial covering agent and the tundish modifying covering agent are both the tundish impact zone and the casting zone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210682377.4A CN115156492B (en) | 2022-06-15 | 2022-06-15 | Tundish covering agent for high-clean steel IF steel continuous casting process and adding method thereof |
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| CN202210682377.4A CN115156492B (en) | 2022-06-15 | 2022-06-15 | Tundish covering agent for high-clean steel IF steel continuous casting process and adding method thereof |
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| 王德永, 刘承军, 王新丽, 史培阳, 朱传运, 姜茂发, 姚永宽: "稀土氧化物对中间包覆盖剂粘性特征的影响", 特殊钢, no. 03, 21 June 2003 (2003-06-21), pages 29 - 30 * |
| 陈艳芳等: "CaF2对碱性中间包覆盖剂物性参数的影响", 科技资讯, no. 28, pages 1 - 2 * |
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