CN115229139A - Heavy rail steel continuous casting tundish covering agent and adding method thereof - Google Patents
Heavy rail steel continuous casting tundish covering agent and adding method thereof Download PDFInfo
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- CN115229139A CN115229139A CN202210682383.XA CN202210682383A CN115229139A CN 115229139 A CN115229139 A CN 115229139A CN 202210682383 A CN202210682383 A CN 202210682383A CN 115229139 A CN115229139 A CN 115229139A
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- covering agent
- tundish
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- modifying
- heavy rail
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000009749 continuous casting Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 104
- 239000012535 impurity Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 230000001976 improved effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 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
- 238000004321 preservation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- 239000006184 cosolvent Substances 0.000 description 1
- 230000007547 defect Effects 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
- 239000003607 modifier Substances 0.000 description 1
- 230000007935 neutral effect Effects 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
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000009628 steelmaking Methods 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
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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 for continuous casting of heavy rail steel and an adding method thereof. The initial covering agent comprises (wt%): caO:37.0 to 47.0 of BaCO 3 ：9.0～13.0，MgO：8.0～12.0，Al 2 O 3 ：20.0～30.0，Na 2 CO 3 ：1.0～3.0，CaF 2 ：0.8～1.2，FeO+MnO：<1, C: 4.0-8.0, etc.; the modifying covering agent comprises (wt%): caO:55 to 65, baO:8 to 12, mgO:4 to 6 of Al 2 O 3 ：14～18，Na 2 O：3～5，CaF 2 ：2.8～3.2，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 heavy rail 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 for continuous casting of heavy rail steel and an adding method thereof.
Background
The heavy rail steel is used for laying heavy-duty railway steel rails and strictly meets the severe service performance requirements of abrasion, fatigue and the like of a freight train under heavy-duty impact. In order to meet the performance requirements, the purity of molten steel in the steelmaking process needs to be strictly controlled, and inclusions in the steel need to be reduced. In the process of continuous casting of the heavy rail steel, the tundish is used as a key metallurgical container of a continuous casting machine, and plays a key role in improving the purity of the molten steel. The tundish covering agent plays important roles of 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 divided into three types of acidity, neutrality and alkalinity according to alkalinity, and the alkalinity R (CaO/SiO) of the acidic covering agent 2 )<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 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. The alkaline tundish covering agent is comprehensively popularized and applied and becomes the main type of the covering agent at present.
Although the alkaline tundish covering agent developed and applied at present can basically meet the production requirement of heavy rail steel, certain defects still exist in the aspect of inclusion adsorption removal capacity, and are mainly reflected in two aspects: (1) the covering agent adopted currently is added in a first furnace of the tundish, and the covering agent is rarely added or is not adjusted 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 is obviously changed, so that the adsorption and inclusion capacity of the tundish covering agent is obviously reduced, and the subsequent heat molten steel inclusion floating removal is not facilitated. (2) Current alkaline tundish covering agents are generally provided with a certain amount of SiO 2 To meet the requirement of slagging performance, while the heavy rail steel adopts Si and other elements to deoxidize to generate SiO 2 If the covering agent contains a certain amount of SiO 2 SiO which is not beneficial to the deoxidation process of the heavy rail steel 2 The impurities float upwards and enter the tundish covering agent.
Disclosure of Invention
In order to solve the technical problems and effectively improve the molten steel purity in the heavy rail steel production process, the invention provides a tundish covering agent suitable for the heavy rail steel continuous casting process, which can effectively improve the tundish covering agent to the heavy rail steel SiO on the basis of effectively playing the basic functions of heat preservation of the covering agent, avoiding secondary oxidation of the molten steel in contact with air and the like 2 The capability of removing impurities of the same type can obviously improve the purity of molten steel.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides an initial covering agent for a continuous casting tundish of a heavy rail steel, which comprises the following components in percentage by mass:
CaO：37.0～47.0％，BaCO 3 ：9.0～13.0％，MgO：8.0～12.0％，Al 2 O 3 ：20.0～30.0％，Na 2 CO 3 ：1.0～3.0％，CaF 2 ：0.8～1.2％，FeO+MnO：<1.0％，C：4.0～8.0％，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 scheme, further, the particle size of the initial covering agent is less than or equal to 3mm.
The invention also provides a heavy rail steel continuous casting tundish modifying covering agent which comprises the following components in parts by weight: the composite material comprises the following components in parts by mass:
CaO：55.0～65.0％，BaO：8.0～12.0％，MgO：4.0～6.0％，Al 2 O 3 ：14.0～18.0％，Na 2 O：3.0～5.0％，CaF 2 ：2.8～3.2％，FeO+MnO：<1.0％，H 2 O：<0.5 percent, and the balance of inevitable impurities.
In the above technical solution, the melting point of the modifying covering agent is 1300 to 1500 ℃.
In the above technical scheme, further, the particle size of the modifying covering agent is less than or equal to 5mm.
The invention also provides an adding method of the tundish covering agent for continuous casting of heavy rail steel, which comprises the following steps:
in the initial casting stage of the tundish, a first furnace is started to be cast, and when the molten steel reaches the working liquid level of the tundish, the solid tundish initial covering agent is added; the molten modifying/covering agent for a tundish is added at the middle stage of the tundish casting, i.e., at about half the number of furnaces in which the tundish is continuously cast.
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 adding positions of the tundish initial covering agent and the tundish modifying covering agent are both a tundish impact region and a casting region.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, a certain amount of solid initial covering agent is added in the first furnace for pouring the tundish, and the molten liquid tundish modifying covering agent is added in the middle stage of pouring the tundish after a certain number of furnaces, so that the performance deterioration caused by a large amount of adsorbed impurities in the initial covering agent in the middle stage of pouring the tundish is obviously improved, and the higher adsorption capacity of the impurities is further maintained;
(2) Adsorption of SiO to effectively enhance the covering agent 2 Inclusion-like ability, no SiO addition to the initial covering agent 2 ；
(3) In order to further enhance the alkalinity of the tundish covering agent and increase the capability of removing impurities, the invention adopts BaCO 3 Replacing part of CaO, baCO in the covering agent 3 The basicity of BaO formed by decomposition is stronger than that of CaO, which is more beneficial to capturing SiO 2 Like inclusions with BaCO 3 CO formed by decomposition 2 The initial covering agent is promoted, and the covering performance of the initial covering agent of the tundish is improved;
(4) In order to effectively reduce the melting point of the tundish covering agent, siO is not added 2 Under the condition of (1), the slagging performance is ensured, and Na is adopted in the invention 2 CO 3 Replacing part of the conventional CaF in the covering agent 2 As a cosolvent, na 2 CO 3 The NaO formed by decomposition can effectively reduce the melting point of the covering agent, and the CO formed by decomposition can be simultaneously used 2 The covering performance of the tundish covering agent can be further improved.
Detailed Description
The invention is further illustrated, but is not in any way limited, by the following specific examples.
Example 1
Taking the application situation of continuously casting 4 times of heavy rail steel (18 furnaces per time) by a 6-flow 40-ton tundish as an example, the existing covering agent is adopted for the 1 st time, and the covering agent disclosed by the invention is adopted for the subsequent 3 times, and the method specifically comprises the following steps:
(1) And (3) starting a first furnace for the 1 st ladle, when the tundish molten steel reaches the tundish working liquid level of 800mm, adding 150kg of the existing covering agent into an impact area of the tundish through a baking hole of a ladle cover, adding 135kg of the existing covering agent into casting areas at two sides respectively, uniformly spreading the molten covering agent in the impact area and the casting areas at two sides to form a molten covering agent with the thickness of about 13mm, wherein the components and the properties of the existing covering agent are shown in table 1, and no covering agent is added in the subsequent furnace.
TABLE 1 ingredients (wt%) and Properties of the conventional covering agent
(2) And 2, pouring the first furnace for each ladle from the 2 nd ladle to the 4 th ladle, when the molten steel in the tundish reaches the working liquid level of the tundish of 800mm, adding 100kg of the initial covering agent to the impact area of the tundish through the baking hole of the ladle cover, adding 100kg 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 in 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 ingredient (wt%) and Properties of the initial covering agent of the present invention added in package 4
(3) In the casting process of each ladle from the 2 nd ladle to the 4 th ladle, 120kg 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 composition (wt%) and Properties of ladle quality modifier for ladle 2
TABLE 6 fraction (wt%) and properties of ladle quality-improving covering agent for 3 rd ladle
TABLE 7 fraction (wt%) and properties of ladle quality-improving covering agent for ladle 3
(4) And (3) starting to pour the furnace 9 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 800mm, wherein 50kg of the molten modifying covering agent is added into an impact area, and 35kg of the molten modifying covering agent is added into casting areas on two sides.
Table 8 compares the process effect before and after application of the disclosed coverlays. Compared with the original covering agent, after the covering agent is adopted, the nitrogen content of the molten steel in the tundish is increased by 1.8 multiplied by 10 -6 Reduced to 1.1 × 10 -6 ～1.3×10 -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 12X 10 -6 Down to 9.3X 10 -6 ～10×10 -6 The density of the casting blank inclusions is 8/mm 2 Reduce the number of the particles to 5.8 to 6.2/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 drop of molten steel in each furnace of the tundish is reduced from 10 ℃ to 8-8.4 ℃, which shows that the heat preservation effect of the covering agent is improved.
TABLE 8 comparison of Effect before and after application of tundish covering agent for heavy rail steel
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. The initial covering agent for the continuous casting tundish of the heavy rail steel is characterized by comprising the following components in parts by mass:
CaO：37.0～47.0％，BaCO 3 ：9.0～13.0％，MgO：8.0～12.0％，Al 2 O 3 ：20.0～30.0％，Na 2 CO 3 ：1.0～3.0％，CaF 2 ：0.8～1.2％，FeO+MnO：<1.0％，C：4.0～8.0％，H 2 O：<0.5 percent, and the balance of inevitable impurities.
2. The initial covering agent for the continuous casting tundish of the heavy rail steel according to claim 1, wherein the melting point of the initial covering agent is 1200-1400 ℃.
3. The initial covering agent for the continuous casting tundish of the heavy rail steel according to claim 1, wherein the particle size of the initial covering agent is less than or equal to 3mm.
4. A heavy rail steel continuous casting tundish modifying covering agent: the composite material is characterized by comprising the following components in parts by mass:
CaO：55.0～65.0％，BaO：8.0～12.0％，MgO：4.0～6.0％，Al 2 O 3 ：14.0～18.0％，Na 2 O：3.0～5.0％，CaF 2 ：2.8～3.2％，FeO+MnO：<1.0％，H 2 O：<0.5 percent, and the balance of unavoidable impurities.
5. The heavy rail steel continuous casting tundish modifying covering agent according to claim 4, wherein the melting point of the modifying covering agent is 1300-1500 ℃.
6. The heavy rail steel continuous casting tundish modifying covering agent according to claim 4, wherein the particle size of the modifying covering agent is less than or equal to 5mm.
7. A method for adding a covering agent into a heavy rail steel continuous casting tundish 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 the solid tundish initial covering agent according to claim 1; 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 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.
9. The addition method according to claim 7, wherein the positions of adding the tundish initial covering agent and the tundish modifying covering agent are both a tundish impact zone and a casting zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210682383.XA CN115229139B (en) | 2022-06-15 | 2022-06-15 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
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| CN202210682383.XA CN115229139B (en) | 2022-06-15 | 2022-06-15 | Heavy rail steel continuous casting tundish covering agent and adding method thereof |
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| CN115229139A true CN115229139A (en) | 2022-10-25 |
| CN115229139B CN115229139B (en) | 2024-02-02 |
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