CN106111928A - A kind of novel containing Mn, Al steel covering slag and application thereof - Google Patents
A kind of novel containing Mn, Al steel covering slag and application thereof Download PDFInfo
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- CN106111928A CN106111928A CN201610470749.1A CN201610470749A CN106111928A CN 106111928 A CN106111928 A CN 106111928A CN 201610470749 A CN201610470749 A CN 201610470749A CN 106111928 A CN106111928 A CN 106111928A
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- covering slag
- slag
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- cao
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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
Abstract
The present invention relates to a kind of novel containing Mn, Al steel covering slag and application thereof；Belong to continuous casting of iron and steel covering slag technical field.Covering slag of the present invention, includes following component: CaO 24～43%, Al by percentage to the quality2O316～34%, SiO27～17%, MgO 2～5%, Na2O 6～12%, K2O 3～7%, F‑5～12%, BaO 2～8%, SrO 1～7%, MnO 1～3%, B2O31～5%C 0.8～2.1%.This covering slag has the features such as fusing point is low, viscosity is low, glass properties is good.Covering slag designed by the present invention is applicable to C weight/mass percentage composition 0.14～0.20%, Al weight/mass percentage composition 1.5～2.5%, Mn weight/mass percentage composition in the range of 21.5～25.0% containing Mn, Al steel continuous casting.Covering slag of the present invention is applied to containing in Mn, Al plate slab continuous casting production process; slag steel can be effectively reduced react with the deterioration slowing down its covering slag performance caused; improve desulphurization tension force to prevent slag; ensure that lubrication and heat transfer property that covering slag is good; realize meniscus position uniformly transfer heat, it is possible to water outpour surface quality excellent containing Mn, Al steel strand.
Description
Technical field
The present invention relates to a kind of novel containing Mn, Al steel covering slag and application thereof；Belong to continuous casting of iron and steel covering slag technical field.
Background technology
As functional material important in casting process, covering slag plays adiabatic heat-insulation in continuous cast mold, prevents steel
Water secondary oxidation, absorption nonmetal inclusion, the lubrication important function such as green shell and Heat Transfer Control.The quality of covering slag performance, directly
Decide slab quality, thus affect productivity effect.
It is made to occur in that problems in casting process yet with containing high alumina high Mn content in Mn, Al steel: (1) steel
The alloying element contents such as middle Mn, Al are higher, liquidus temperature low (more conventional middle carbon aluminum killed steel is low about 80 DEG C), and solidify
In journey, molten steel latent heat is big, casting blank solidification speed is slow；(2) Al SiO easily and in covering slag in steel2Deng occurring, oxidoreduction is anti-
Should, cause covering slag melt cinder degeneration, make Al in covering slag2O3Content increases, SiO2Content reduces, and basicity becomes big, fusing point, viscosity
Increase；(3) steel Han Mn, Al belongs to austenitic steel, and thermal coefficient of expansion is big, and in crystallizer, during solidification, green shell is shunk serious, easily
Make shell thickness uneven, cause the defect such as surface indentation, crackle；(4) aluminum content is high, the Al formed after oxidation2O3Have little time into
Enter melt cinder, the easy dross in mouth of a river blocking during continuous casting.
For above-mentioned containing Mn, Al steel casting process produced problem, existing thinking is by increasing SiO2Content controls cast
During covering slag basicity change within normal range, and reduce Al in slag2O3Content is to keep covering slag in casting process
Al2O3Content, in controlled range, regulates the content of other compositions in slag so that covering slag meets the requirement that continuous casting produces simultaneously.
From the point of view of the situation of literature search, relatively fewer currently for the covering slag containing the design of Mn, Al steel casting process and exploitation.Open
Number disclose one for the patent " high-aluminum high-manganese type nonmagnetic steel crystallizer covering slag and manufacture method thereof " of CN 102233414 A
CaO-SiO2It is nonmagnetic steel covering slag extremely manufacture method, but this covering slag does not considers Al and the SiO in slag in steel2、B2O3Deng send out
Raw slag steel reaction, the impact on covering slag penalty, and the strand that produces therefrom produce a large amount of lobes and be mingled with etc. and ask
Topic, therefore this mold flux property still has several drawbacks for slab caster production steel Han Mn, Al.
Summary of the invention
Present invention aim at for the deficiencies in the prior art, it is provided that a kind of reasonable mixture ratio of components, low viscosity, low melting point,
Glass properties is good, slag steel reacts few covering slag and containing the application in Mn, Al steel.
One covering slag of the present invention, includes following component by percentage to the quality:
CaO:24～43%, preferably 25～40%, more preferably 27～40%；
Al2O3: 16～34%, preferably 16～30%, more preferably 18～25%；
SiO2: 7～17%, preferably 9～15%, more preferably 10～12%；
MgO:2～5%, preferably 2～4%, more preferably 2.2～3.0%；
Na2O:6～12%, preferably 8～11%, more preferably 9～10%；
K2O:3～7%, preferably 4～6%, more preferably 4.2～5.0%；
BaO+SrO 3～15%, preferably 7～14%, more preferably 10～14%；
MnO:1～3%, preferably 1.5～2.5%, more preferably 1.8～2.2%；
F-: 5～12%, preferably 7～11%, more preferably 8～10%；
B2O3: 1～5%；It is preferably 1.5～4.5%, more preferably 2～4%；
C:0.8～2.1%, preferably 0.9～1.9%, more preferably 1.2～1.8%.
In covering slag of the present invention, the mass ratio of BaO Yu SrO is 5-7:5-7, more preferably 1-1.1:1.
In covering slag of the present invention, CaO+BaO and Al2O3Mass ratio is 1～2:1, and preferably 1.2～2:1 enter one
Step is optimized for 1.5～2:1.
In covering slag of the present invention, described F-Selected from CaF2、NaF、Na3AlF6In at least one is allocated in covering slag.
In covering slag of the present invention；Described CaO adds in covering slag with the form of Calx；Al2O3Shape with bauxite
Formula adds in covering slag；SiO2Add in covering slag with the form of Silicon stone；MgO adds in covering slag with the form of magnesia；Na2O with
The form of soda adds in covering slag；K2O adds in covering slag with the form of the carbonate of potassium；BaO is with the shape of the carbonate of barium
Formula adds in covering slag；MnO adds in covering slag with the form of the carbonate of manganese.
The melting range of covering slag of the present invention is 1040～1100 DEG C, the range of viscosities of 1300 DEG C be 0.12～
0.18Pa·s。
The application of covering slag of the present invention, including being used as containing Mn, Al steel continuous casting covering slag.
The application of covering slag of the present invention, described is 1.5～2.5% containing Al weight/mass percentage composition in Mn, Al steel；Mn matter
Amount percentage composition is 21.5～25.0%.
The application of covering slag of the present invention, described containing in Mn, Al steel, C weight/mass percentage composition is 0.14～0.20%.
When covering slag designed by the present invention is applied to containing Mn, Al steel continuous casting, the scrappage of products obtained therefrom is low, properties of product are excellent
Good, the probability that gained strand lobe and situation about being mingled with occur is less than 0.16%, optimum can be less than 0.12%.This well beyond
Anticipated.
Principle and advantage
Covering slag of the present invention is CaO-Al2O3Series protection slag, CaO-Al2O3Series protection slag is a kind of non-reaction slag system,
Al in this type of covering slag composition2O3Content is higher, and SiO2Content is less, effective suppression [Al]+3/4 (SiO2)=3/4 [Si]
+1/2(Al2O3) molecular balance carries out to the right.But SiO2It is most important Network former in slag, to controlling viscosity coefficient of dross
Characteristic and crystal property have critically important impact, it is impossible to reduction SiO simply2Content, covering slag of the present invention is controlled
In rational level.
In covering slag of the present invention, by the synergism of appropriate each constituent element, achieve beyond thought effect.Especially
It is that appropriate BaO+SrO is the most excellent with the collaborative acquired effect of other components.Designed by the present invention, covering slag is applied to
During containing Mn, Al steel continuous casting, the scrappage of products obtained therefrom is low, properties of product are excellent, and gained strand lobe and situation about being mingled with occur
Probability less than 0.16%, optimum can be less than 0.12%.
Detailed description of the invention
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.
The fusion temperature of the covering slag of the present invention, the viscosity of 1300 DEG C are respectively adopted metallurgy industry standard YB/T186 and YB/
T185 measures.Crystal property uses the heat wire method of industry universal to measure.First covering slag raw material is according to target become by test process
Dividing and weigh mixing, in mortar, ground and mixed is uniform, is then placed in intermediate frequency furnace and is warming up to 1500 DEG C of fusing covering slags, treats it
After fusing, stirring makes its composition uniformly be incubated 10min, then molten state slag is poured into water chilling obtains glassy state covering slag block,
Heated filament experiment is carried out after finally covering slag being milled into powder.
Embodiment 1
A kind of novel containing Mn, Al steel covering slag, its composition quality percentage composition is: CaO:28%, Al2O3: 19.6%,
SiO2: 10.3%, MgO:2.3%, Na2O:9.1%, K2O:4.6%, BaO:5.4%, SrO:5%, MnO:2.1%, F-: 9%,
B2O3: 3.1%, C:1.5%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.70,1300 DEG C be 0.15Pa
S, fusing point is 1048 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is
2.5% containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.14%.
Embodiment 2
A kind of novel containing Mn, Al steel covering slag, its composition quality percentage composition is: CaO:27.5%, Al2O3: 20.1%,
SiO2: 10%, MgO:2.6%, Na2O:9%, K2O:4.7%, BaO:5%, SrO:5%, MnO:2.2%, F-: 9.6%, B2O3:
2.7%, C:1.6%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.61,1300 DEG C be 0.14Pa s, molten
Point is 1067 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is 2.5%
Containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.16%.
Embodiment 3
A kind of novel containing Mn, Al steel covering slag, its composition quality percentage composition is: CaO:28.5%, Al2O3: 19.3%,
SiO2: 11%, MgO:2.2%, Na2O:9%, K2O:4.2%, BaO:5%, SrO:5%, MnO:2.2%, F-: 9.4%, B2O3:
2.6%, C:1.6%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.74,1300 DEG C be 0.16Pa s, molten
Point is 1059 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is 2.5%
Containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.12%.
Embodiment 4
A kind of novel containing Mn, Al steel covering slag, its composition quality percentage composition is: CaO:29.5%, Al2O3: 18.3%,
SiO2: 11.2%, MgO:2.2%, Na2O:9%, K2O:4.3%, BaO:5.1%, SrO:5.1%, MnO:2.2%, F-:
8.9%, B2O3: 2.9%, C:1.3%, CaO+BaO and Al of this covering slag2O3Mass ratio is that the viscosity of 1.89,1300 DEG C is
0.13Pa s, fusing point is 1079 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al percent mass
Content be 2.5% containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.13%.
Comparative example 1
A kind of continuous crystallizer protecting slag, its composition quality percentage composition is: CaO:30.4%, Al2O3: 20.3%,
SiO2: 11.2%, MgO:2.2%, Na2O:9%, K2O:4.3%, BaO:5.2%, SrO:5%, MnO:2.2%, F-: 8.9%,
B2O3: 0%, C:1.3%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.75,1300 DEG C be 0.14Pa s,
Fusing point is 1129 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is 2.5%
Containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.32%.
In this comparative example, it is not added with B2O3, cause fusing point higher, the probability that gained strand lobe and situation about being mingled with occur
Higher.
Comparative example 2
A kind of continuous crystallizer protecting slag, its composition quality percentage composition is: CaO:29.7%, Al2O3: 19.3%,
SiO2: 11.2%, MgO:2.2%, Na2O:10%, K2O:4.3%, BaO:5%, SrO:5.2%, MnO:0%, F-: 8.9%,
B2O3: 2.9%, C:1.3%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.80,1300 DEG C be 0.17Pa
S, fusing point is 1063 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is
2.5% containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.46%.
In this comparative example, being not added with MnO, cause manganese element in steel to enter in a large number in slag, the physical and chemical performance of slag is deteriorated,
The probability that gained strand lobe and situation about being mingled with occur is higher.
Comparative example 3
A kind of continuous crystallizer protecting slag, its composition quality percentage composition is: CaO:27%, Al2O3: 18.3%, SiO2:
9.5%, MgO:2.2%, Na2O:9%, K2O:4.2%, BaO:5%, SrO:5%, MnO:2.2%, F-: 8.4%, B2O3:
2.6%, C:6.6%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.75,1300 DEG C be 0.17Pa s, molten
Point is 1089 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is 2.5%
Containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.42%.
In this comparative example, adding C too high, cause molten steel carburetting serious, gained strand slag is serious, gained strand lobe and
The probability that situation about being mingled with occurs is higher.
Comparative example 4
A kind of continuous crystallizer protecting slag, its composition quality percentage composition is: CaO:29.4%, Al2O3: 18.4%,
SiO2: 11.1%, MgO:2.3%, Na2O:9.2%, K2O:4.1%, BaO:10.1%, SrO:0%, MnO:2.2%, F-:
8.9%, B2O3: 2.9%, C:1.4%, CaO+BaO and Al of this covering slag2O3Mass ratio is that the viscosity of 2.15,1300 DEG C is
0.33Pa s, fusing point is 1089 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al percent mass
Content be 2.5% containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.53%.
In this comparative example, being not added with SrO, cause covering slag viscosity higher, and glassy state is less, gained strand slag is tight
The probability that weight, gained strand lobe and situation about being mingled with occur is higher.
Comparative example 5
A kind of continuous crystallizer protecting slag, its composition quality percentage composition is: CaO:28%, Al2O3: 19.6%, SiO2:
10.3%, MgO:2.3%, Na2O:9.1%, Li2O:4.6%, BaO:5.1%, SrO:5.3%, MnO:2.1%, F-: 9%,
B2O3: 3.1%, C:1.5%, CaO+BaO and Al of this covering slag2O3Mass ratio be the viscosity of 1.69,1300 DEG C be 0.14Pa
S, fusing point is 1091 DEG C.Covering slag Mn weight/mass percentage composition designed by this embodiment is 23%, Al weight/mass percentage composition is
2.5% containing Mn, Al steel continuous casting；The probability that gained strand lobe and situation about being mingled with occur is less than 0.17%.
In this comparative example, add Li2O and be not added with K2O, although gained slab quality relatively embodiment is more or less the same, but due to
Li2O price relatively K2O is expensive, and this covering slag economy is poor.
By 4 embodiments of comparative example 1,2,3,4,5 and the present invention it can be seen that the covering slag of the present invention can be very
Good is used for containing Mn, Al steel casting process, and obtained strand occurs that lobe and the probability being mingled with are far below other covering slag, casting
Base quality substantially improves.
Claims (10)
1. one kind novel containing Mn, Al steel covering slag, it is characterised in that include following component by percentage to the quality:
CaO:24～43%；
A12O3: 16～34%
SiO2: 7～17%；
MgO:2～5%；
Na2O:6～12%；
K2O:3～7%；
BaO+SrO:3～15%；
MnO:1～3；
F-: 5～12%；
B2O3: 1～5%；
C 0.8～2.1%.
Covering slag the most according to claim 1, it is characterised in that: described covering slag includes following group by percentage to the quality
Point:
CaO:25～40%；
A12O3: 16～30%
SiO2: 9～15%；
MgO:2～4%；
Na2O:8～11%；
K2O:4～6%；
BaO+SrO:7～14%；
MnO:1.5～2.5%；
F-: 7～11%；
B2O3: 1.5～4.5%；
C 0.9～1.9%.
Covering slag the most according to claim 2, it is characterised in that: described covering slag includes following group by percentage to the quality
Point:
CaO:27～40%；
A12O3: 18～25%
SiO2: 10～12%；
MgO:2.2～3.0%；
Na2O:9～10%；
K2O:4.2～5.0%；
BaO+SrO:10～14%, and the mass ratio of BaO Yu SrO is 5-7:5-7；
MnO:1.8～2.2%；
F-: 8～10%；
B2O3: 2～4%；
C 1.2～1.8%.
Covering slag the most according to claim 1, it is characterised in that: CaO+BaO and Al in covering slag2O3Mass ratio is 1～2:
1。
Covering slag the most according to claim 1, it is characterised in that: F-Selected from CaF2、NaF、Na3AlF6In at least one.
Covering slag the most according to claim 1；It is characterized in that: CaO adds in covering slag with the form of Calx；Al2O3With
The form of bauxite adds in covering slag；SiO2Add in covering slag with the form of Silicon stone；MgO adds protection with the form of magnesia
In slag；Na2O adds in covering slag with the form of soda；K2O adds in covering slag with the form of the carbonate of potassium；BaO is with barium
The form of carbonate adds in covering slag；MnO adds in covering slag with the form of the carbonate of manganese.
7. according to the covering slag described in claim 1 any one, it is characterised in that: the fusing point of described covering slag be 1040～
1100 DEG C, the viscosity of 1300 DEG C be 0.12～0.18Pa s.
8. the application of covering slag as described in claim 1-7 any one, it is characterised in that: include being used as containing Mn, Al steel continuous casting
Covering slag.
The application of a kind of covering slag the most according to claim 8, it is characterised in that: described containing Al mass hundred in Mn, Al steel
Dividing content is 1.5～2.5%；Mn weight/mass percentage composition is 21.5～25.0%.
The application of a kind of covering slag the most according to claim 8, it is characterised in that: described containing in Mn, Al steel, C mass hundred
Dividing content is 0.14～0.20%.
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| CN110560649A (en) * | 2019-10-12 | 2019-12-13 | 中南大学 | Novel high-aluminum steel casting powder and application thereof |
| CN112391541A (en) * | 2019-08-14 | 2021-02-23 | 山特维克材料技术公司 | Mold flux and method for manufacturing nickel-based alloy |
| JP2021074782A (en) * | 2021-01-20 | 2021-05-20 | 品川リフラクトリーズ株式会社 | Mold powder and method of producing medium-carbon steel |
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| CN106111928B (en) | 2018-12-21 |
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