CN106001473B - A kind of chrome-bearing steel continuous crystallizer protecting slag and its application - Google Patents
A kind of chrome-bearing steel continuous crystallizer protecting slag and its application Download PDFInfo
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- CN106001473B CN106001473B CN201610471335.0A CN201610471335A CN106001473B CN 106001473 B CN106001473 B CN 106001473B CN 201610471335 A CN201610471335 A CN 201610471335A CN 106001473 B CN106001473 B CN 106001473B
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- covering slag
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- bearing steel
- slag
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- 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
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- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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Abstract
The present invention relates to a kind of chrome-bearing steel continuous crystallizer protecting slag and its applications；Belong to continuous casting of iron and steel covering slag technical field.Covering slag of the present invention includes following components: CaO 30~33%, SiO by percentage to the quality228~34%, Al2O32~5%, MgO 1~3%, (Na2O+K2O) 12~16%, B2O31~6%, BaO 1~3%, SrO 1~2%, F‑11~14%, C 1~1.5%.The covering slag has the characteristics that fusing point is low, viscosity is low, crystallization temperature is high.The continuous casting of chrome-bearing steel it is suitable for C mass percentage in 1.3~1.8%, Cr mass percentage in 10~15% ranges.When being applied to the production of chrome-bearing steel sheet billet continuous casting, slab lubrication can increase, control and conduct heat at meniscus, reduce slab lobe and be mingled with, improve the quality of slab.
Description
Technical field
The present invention relates to a kind of chrome-bearing steel continuous crystallizer protecting slag and its applications；Belong to continuous casting of iron and steel covering slag technology neck
Domain.
Background technique
As functional material important in continuous casting process, covering slag plays adiabatic heat-insulation in continuous cast mold, prevents steel
Water secondary oxidation absorbs nonmetal inclusion, the lubrication important function such as green shell and Heat Transfer Control.The quality of covering slag performance, directly
Slab quality is decide, to influence productivity effect.
Chrome-bearing steel is used as a kind of higher steel of carbon content first, by Fe-C binary phase diagraml it is found that with carbon content in steel
Increase, the liquid-solid phase line temperature temperature difference of steel becomes larger, and therefore, chrome-bearing steel has wider pasting temperature section, it is easier to cause carbon and
The segregation gross segregation of the impurity elements such as phosphorus, sulphur, so that chrome-bearing steel high-temp plastic is poor, Testing Tensile Strength at Elevated Temperature is low；Meanwhile containing chromium
Austenite is directly precipitated in steel in process of setting from liquid steel, therefore the contraction of initial solidification green shell is small, acts in ferrostatic pressure
Lower green shell and crystallizer wall contact are close, and covering slag is difficult to penetrate into, so that distribution of the covering slag in crystallizer/slab gap is not
Uniformly, lead to the frictional force being subject to due to green shell is bad because lubricating and because of the additional thermal stress increase unevenly generated of conducting heat, casting
Base is easy to produce crackle, and bleedout accident is generated when serious.Therefore, how the matter of utmost importance for ensureing that chrome-bearing steel continuous casting is gone on smoothly is
Meet the needs of slab lubrication, this needs covering slag to have lower viscosity and fusion temperature.
Secondly the alloying elements cr added in chrome-bearing steel, although the addition of Cr can greatly improve steel product quality, Cr is right
Entire production process has an adverse effect.Cr in steel-making, refining and casting process easily with the O that is dissolved in air or in molten steel
In conjunction with producing a certain amount of high-melting-point Cr2O3Oxide.After these refractory oxides enter crystallizer, it can float into protection
In slag, to deteriorate covering slag performance, inhibit covering slag crystallization.It conducts heat to make covering slag that can not effectively control at meniscus,
The slow cooling for realizing meniscus eventually leads to slab in high-carbon chrome-bearing steel continuous casting process and generates a large amount of lobes and be mingled with, seriously affects
Slab quality.Therefore, this requires covering slag can crystallization temperature with higher again.
From the point of view of from the literature search the case where, there are some protections for designing and developing for carbon containing chrome-bearing steel continuous casting process at present
Slag, such as the patent " CSP sheet billet high-carbon steel continuous casting pouring slag " of Publication No. CN102101162A, Publication No.
The patent " continuous casting mold flux for high-carbon cutting mold steel " of CN102335731A and the patent " high-carbon of Publication No. CN103223477A
Steel continuous crystallizer protecting slag ".But these covering slags do not consider the Gao Rong that the Cr element oxide in carbon containing chrome-bearing steel is formed
Point Cr2O3, to the influence that covering slag performance deteriorates, and a large amount of lobes of slab generation generated therefrom and the problems such as being mingled with, because
This these covering slag is not suitable for slab caster production chrome-bearing steel, is not particularly suitable for producing C mass for slab caster
Chrome-bearing steel slab product of the percentage composition in 1.3~1.8%, Cr mass percentage 10~15%.Inventor was also once simultaneously
It studied the intermediate covering of chrome-bearing steel and its applied (see application No. is 201510268787.4), but due to the difference of applicable object
It is different；The covering is caused to be difficult to be used as chrome-bearing steel continuous crystallizer protecting slag.
Summary of the invention
Present invention aims in view of the deficiencies of the prior art, provide a kind of reasonable mixture ratio of components, viscosity is low, fusing point is low,
The high covering slag of crystallization temperature and its application in chrome-bearing steel.
A kind of covering slag of the present invention, includes following components by percentage to the quality:
CaO 30~33%, preferably 30-32%, further preferably 30.2-31.8%；
SiO228~34%, preferably 28-31%, further preferably 28.7-30.2%；
Al2O32~5%, preferably 3-4%, further preferably 3.2-3.8%；
MgO 1~3%, preferably 1.5-2.5%, further preferably 1.8-2.2%；
(Na2O+K2O) 12~16%, preferably 14-16%, further preferably 14.5-15.5%；
B2O31~6%, preferably 2-5%, further preferably 2.5-3.2%；
(BaO+SrO) 2~5%；As optimum condition:
BaO 1~3%, preferably 1.3-2.5%, further preferably 1.5-2.5%；
SrO 1~2%, preferably 1.3-2%, further preferably 1.3-1.5%；
F-11~14%, preferably 11.5-13.5%, further preferably 12-13%；
C 1~1.5%, preferably 1.1-1.4%, further preferably 1.2-1.3%.
In covering slag of the present invention, CaO and SiO2Mass ratio is 0.95~1.15:1.Preferably 1.0-1.15:1, into
One step is preferably 1.05-1.15:1.
In covering slag of the present invention, the F-With CaF2、NaF、Na3AlF6In any one form be incorporated covering slag.
The melting range of covering slag of the present invention is 940~1040 DEG C, 1300 DEG C of range of viscosities is 0.06~
0.11Pas, crystallization range are 1210~1305 DEG C.
In covering slag of the present invention, Na2O and K2The mass ratio of O be 3~9:1, preferably 4~8:1, further preferably
6-7:1.
The application of covering slag of the present invention, including it is used as chrome-bearing steel continuous casting covering slag.
The application of covering slag of the present invention, Cr mass percentage is 10~15% in the chrome-bearing steel.
The application of covering slag of the present invention, in the chrome-bearing steel, C mass percentage is 1.3~1.8%.
Principle and advantage
In covering slag of the present invention, by the synergistic effect of appropriate each constituent element, unexpected effect is achieved.Especially
It is suitable BaO+SrO, C the most excellent with effect acquired by the cooperateing with of other components.Covering slag application designed by the present invention
When chrome-bearing steel continuous casting, the scrappage of products obtained therefrom is low, properties of product are excellent, what gained slab lobe and the case where being mingled with occurred
Probability lower than 0.17%, optimal can be lower than 0.11%.
Specific embodiment
Below in conjunction with example, the invention will be further elaborated, and example is merely to illustrate the present invention, rather than with any
Form limits the present invention.
Metallurgy industry standard YB/T186 and YB/ is respectively adopted in the fusion temperature of covering slag of the invention, 1300 DEG C of viscosity
T185 measurement.Crystallization temperature is measured using the heat wire method of industry universal.In test process first by covering slag raw material according to target at
Divide and weigh mixing, is then melted using intermediate frequency furnace, keep its ingredient uniform, then molten state slag is poured into water chilling and obtains glass
Glass state covering slag block carries out heated filament experiment after blocky covering slag is finally milled into powder by covering slag.Heat wire method measurement is protected
It protects during slag crystallization temperature, the thermocouple for being loaded with covering slag is first warming up to 1500 DEG C, with 20 DEG C/s's after heat preservation 3 minutes
Cooling rate cooling, observes and records the time precipitated crystal in covering slag by the video camera being connected on optical microscopy, then
The covering slag temperature that computer acquisition is arrived is searched according to the time, to accurately obtain the crystallization temperature of covering slag.
Embodiment 1
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.7%, SiO2: 29.7%, Al2O3: 3.6%,
MgO:1.8%, (Na2O+K2O): 14.6% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.6%, BaO:1.5%, SrO:
1.5%, F-: 12.7%, C:1.3%.The basicity CaO/SiO of the covering slag2It is 1.03.The covering slag measured using the above method
Main physical index be shown in Table 1.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
The chrome-bearing steel continuous casting that content is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.15%.
Embodiment 2
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.6%, SiO2: 29.8%, Al2O3: 3.5%,
MgO:1.9%, (Na2O+K2O): 14.5% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.7%, BaO:1.6%, SrO:
1.5%, F-: 12.5%, C:1.4%.The basicity CaO/SiO of the covering slag2It is 1.03.The covering slag measured using the above method
Main physical index be shown in Table 1.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
The chrome-bearing steel continuous casting that content is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.13%.
Embodiment 3
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.5%, SiO2: 29.9%, Al2O3: 3.6%,
MgO:1.8%, (Na2O+K2O): 14.9% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.6%, BaO:1.5%, SrO:
1.3%, F-: 12.7%, C:1.2%.The basicity CaO/SiO of the covering slag2It is 1.02.The covering slag measured using the above method
Main physical index be shown in Table 1.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
The chrome-bearing steel continuous casting that content is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.17%.
Embodiment 4
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.4%, SiO2: 30%, Al2O3: 3.3%, MgO:
2.1%, (Na2O+K2O): 14.8% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.6%, BaO:1.5%, SrO:1.3%,
F-: 12.7%, C:1.3%.The basicity CaO/SiO of the covering slag2It is 1.01.The covering slag measured using the above method it is main
Physical index is shown in Table 1.Covering slag Cr mass percentage is 11% designed by the embodiment, C mass percentage is
1.3% chrome-bearing steel continuous casting；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.11%.
Embodiment 5
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.7%, SiO2: 29.7%, Al2O3: 3.7%,
MgO:1.8%, (Na2O+K2O): 14.5% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.7%, BaO:1.5%, SrO:
1.4%, F-: 12.8%, C:1.4%.The basicity CaO/SiO of the covering slag2It is 1.03.The covering slag measured using the above method
Main physical index be shown in Table 1.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
The chrome-bearing steel continuous casting that content is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.15%.
Embodiment 6
A kind of covering slag, composition quality percentage composition are as follows: CaO:31.7%, SiO2: 29.2%, Al2O3: 3.4%,
MgO:1.8%, (Na2O+K2O): 14.6% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.6%, BaO:1.4%, SrO:
1.3%, F-: 12.7%, C:1.3%.The basicity CaO/SiO of the covering slag2It is 1.09.The covering slag measured using the above method
Main physical index be shown in Table 1.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
The chrome-bearing steel continuous casting that content is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.17%.
The main physical parameter of 1 covering slag of table
| Performance indicator | Fusing point (DEG C) | Viscosity (Pas) at 1300 DEG C | Crystallization temperature (DEG C) |
| Embodiment 1 | 986 | 0.08 | 1215 |
| Embodiment 2 | 994 | 0.07 | 1295 |
| Embodiment 3 | 1024 | 0.07 | 1292 |
| Embodiment 4 | 953 | 0.09 | 1273 |
| Embodiment 5 | 995 | 0.10 | 1252 |
| Embodiment 6 | 1032 | 0.07 | 1290 |
Comparative example 1
A kind of covering slag, composition quality percentage composition are as follows: CaO:31.7%, SiO2: 29.2%, Al2O3: 3.4%,
MgO:1.8%, (Na2O+K2O): 14.6% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.9%, BaO:1.7%, SrO:
2%, F-: 12.7%, C:0%.The basicity CaO/SiO of the covering slag2It is 1.09.Using the master for the covering slag that the above method measures
Physical index is wanted to be shown in Table 2.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
For 1.3% chrome-bearing steel continuous casting；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.27%.
Comparative example 2
A kind of covering slag, composition quality percentage composition are as follows: CaO:31.7%, SiO2: 29.2%, Al2O3: 3.8%,
MgO:2.2%, (Na2O+K2O): 15.5% (Na2O/K2O=4.3:1 mass ratio), B2O3: 3.1%, BaO:0%, SrO:2%,
F-: 11%, C:1.5%.The basicity CaO/SiO of the covering slag2It is 1.09.Using the main object for the covering slag that the above method measures
Property index is shown in Table 2.Covering slag Cr mass percentage is 11% designed by the embodiment, C mass percentage is
1.3% chrome-bearing steel continuous casting；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.32%.
Comparative example 3
A kind of covering slag, composition quality percentage composition are as follows: CaO:32.5%, SiO2: 30.9%, Al2O3: 3.6%,
MgO:1.8%, (Na2O+K2O): 15.9% (Na2O/K2O=4.3:1 mass ratio), B2O3: 3.6%, BaO:1.8%, SrO:
2%, F-: 7.7%, C:1.2%.The basicity CaO/SiO of the covering slag2It is 1.05.Using the master for the covering slag that the above method measures
Physical index is wanted to be shown in Table 2.Covering slag Cr mass percentage designed by the embodiment is 11%, C mass percentage
For 1.3% chrome-bearing steel continuous casting；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.41%.
Comparative example 4
A kind of covering slag, composition quality percentage composition are as follows: CaO:30.7%, SiO2:29.7%, Al2O3: 3.7%,
MgO:1.8%, (Na2O+K2O): 14.5% (Na2O/K2O=4.3:1 mass ratio), B2O3: 2.7%, BaO:2.9%, SrO:
0%, F-:12.8%, C:1.4%.The basicity CaO/SiO of the covering slag2It is 1.03.The covering slag measured using the above method
Main physical index is shown in Table 2.Covering slag Cr mass percentage designed by the embodiment is that 11%, C mass percentage contains
The chrome-bearing steel continuous casting that amount is 1.3%；Gained slab lobe and the probability occurred the case where being mingled with are lower than 0.38%.
The main physical parameter of 2 covering slag of table
| Performance indicator | Fusing point (DEG C) | Viscosity (Pas) at 1300 DEG C | Crystallization temperature (DEG C) |
| Comparative example 1 | 982 | 0.08 | 1218 |
| Comparative example 2 | 1194 | 0.07 | 1273 |
| Comparative example 3 | 1006 | 0.07 | 1283 |
| Comparative example 4 | 1016 | 0.13 | 1245 |
It can be fine by the covering slag that comparative example 1,2,3,4 and 6 embodiments of the invention can be seen that the present invention
Be used for chrome-bearing steel continuous casting process, there is lobe and the probability that is mingled with far below other covering slags, slab matter in obtained slab
Amount obviously improves.
Claims (1)
1. a kind of chrome-bearing steel continuous crystallizer protecting slag, composition quality percentage composition are as follows:
CaO:30.4%, SiO2: 30%, Al2O3: 3.3%, MgO:2.1%, (Na2O+K2O): 14.8%, B2O3: 2.6%, BaO:
1.5%, SrO:1.3%, F-: 12.7%, C:1.3%；Wherein Na2O and K2The mass ratio of O is 4.3:1；
The covering slag is for the chrome-bearing steel continuous casting that Cr mass percentage is 11%, C mass percentage is 1.3%；Gained
Slab lobe and the probability occurred the case where being mingled with are lower than 0.11%.
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| CN112705678B (en) * | 2020-12-16 | 2022-04-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for hot work die steel slab and application thereof |
| JP7208544B2 (en) * | 2021-01-20 | 2023-01-19 | 品川リフラクトリーズ株式会社 | Manufacturing method of mold powder and medium carbon steel |
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| EP0015417A1 (en) * | 1979-02-23 | 1980-09-17 | Mobay Chemical Corporation | Particulate slagging agent and process for the continuous casting of steel |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN104308104A (en) * | 2014-09-19 | 2015-01-28 | 中南大学 | Novel casting powder and application thereof |
| CN104399922A (en) * | 2014-11-28 | 2015-03-11 | 中南大学 | Novel corrosion-resistant alloy steel continuous casting powder and application thereof |
| CN105642851A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for large slab medium-carbon steel and preparation method thereof |
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2016
- 2016-06-24 CN CN201610471335.0A patent/CN106001473B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0015417A1 (en) * | 1979-02-23 | 1980-09-17 | Mobay Chemical Corporation | Particulate slagging agent and process for the continuous casting of steel |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN104308104A (en) * | 2014-09-19 | 2015-01-28 | 中南大学 | Novel casting powder and application thereof |
| CN104399922A (en) * | 2014-11-28 | 2015-03-11 | 中南大学 | Novel corrosion-resistant alloy steel continuous casting powder and application thereof |
| CN105642851A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for large slab medium-carbon steel and preparation method thereof |
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