CN104399922A - Novel corrosion-resistant alloy steel continuous casting powder and application thereof - Google Patents
Novel corrosion-resistant alloy steel continuous casting powder and application thereof Download PDFInfo
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- CN104399922A CN104399922A CN201410710112.6A CN201410710112A CN104399922A CN 104399922 A CN104399922 A CN 104399922A CN 201410710112 A CN201410710112 A CN 201410710112A CN 104399922 A CN104399922 A CN 104399922A
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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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Abstract
The invention relates to novel corrosion-resistant alloy steel continuous casting powder and application thereof, and belongs to the technical field of continuous casting of iron and steel. The casting powder comprises the following components in mass percentage: 17 to 25% of CaO, 23 to 31% of SiO2, 10 to 15% of Al2O3, 1 to 4% of MgO, 10 to 14% of (Na2O+Li2O), 1 to 8% of B2O3, 1 to 6% of TiO, 4 to 8% of BaO, and 10 to 13% of F<->. The casting powder has the characteristics that the melting point is small (865-988 DEG C), the viscosity is small (0.11-0.23Pa.s under 1,300 DEG C), the crystallizing rate is moderate (40-70%), etc. The casting powder can be applied well to the continuous casting of corrosion-resistant alloy steel (Fe-Cr-Ni system) containing 0 to 0.3% of Al and 0.8 to 1.1% of Ti in mass percentage.
Description
Technical field
The present invention relates to a kind of new type corrosion resistant steel alloy covering slag and application thereof; Belong to continuous casting of iron and steel technical field.
Background technology
As functional material important in casting process, covering slag plays adiabatic heat-insulation, prevents secondary oxidation of steel, absorbs nonmetal inclusion, lubricates the important function such as base shell and Heat Transfer Control in continuous cast mold.The quality of covering slag performance, directly decides slab quality, thus affects productivity effect.
The alloying element added in steel, while significantly improving steel product quality, also brings adverse effect to its production process.Particularly containing the steel grade of the active metals such as Al, Ti, Mn, Cr, Mo, V, these alloying elements with molten mold flux contact process, instead can give birth to redox reaction by partial oxide in continuous cast mold in slag/steel interface and covering slag.Such as: containing Al and Ti in aluminium, titanium corrosion resistant alloy and the SiO in covering slag
2there is redox reaction: 4 [Al]+3 (SiO2)=2 (Al
2o
3)+3 [Si], [Ti]+(SiO
2)=(TiO
2)+[Si].The Al that reaction generates
2o
3, TiO
2enter covering slag, Si enters in the middle of molten steel.SiO
2consumption will cause the basicity (CaO/SiO of covering slag
2) sharply raise, the Al in covering slag
2o
3, TiO
2content significantly increases.In addition, the field trashes such as AlN, TiN that the active element in alloy also can produce enter in covering slag.These can cause the characteristic generation marked changes such as covering slag viscosity, fusion temperature; covering slag slagging scorification bar is serious; the mobility of melt cinder is not smooth; slag consumption declines; lubrication and the heat transfer controlling functions of covering slag are deteriorated; the serious accidents such as bleed-out will be caused time serious, and also easily there is depression, crackle, the mass defect such as to be mingled with in ingot casting.
From the situation of literature search, there are some at present for the covering slag containing aluminium or titanium alloy casting process design and development, be that CN102248141A is " containing niobium if publication number is publication number, vanadium, Ti low alloyed wide and thick slab high alkalinity crystallizer protecting residue and manufacture method ", publication number is CN102825228A " a kind of high-temperature alloy steel continuous crystallizer protecting slag and manufacture method thereof ", the patent " high-aluminum high-manganese type nonmagnetic steel crystallizer covering slag and manufacture method thereof " of CN101219465A " continuous casting crystallizer casting powder special for bar plate stainless steel containing titanium and production technology thereof " and CN 102233414A.But these covering slags all do not consider the redox reaction that in active element in alloy and covering slag, partial oxide occurs, such as 4 [Al]+3 (SiO
2)=2 (Al
2o
3)+3 [Si], [Ti]+(SiO2)=(TiO
2)+[Si], on the impact of covering slag penalty.And the strand produced therefrom produces a large amount of lobe and the problem such as to be mingled with; therefore these covering slags are not suitable for slab caster and produce the alloy containing active element; especially be not suitable for slab caster and produce Al mass percentage at the corrosion resisting alloy product of 0 ~ 0.3%, Ti mass percentage in 0.8 ~ 1.1% scope.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provides a kind of reasonable mixture ratio of components, slag steel can be suppressed to react, not mutability, the covering slag of viscosity, fusion temperature stability of characteristics and containing the application in aluminium, titanium corrosion resistant alloy.
A kind of covering slag of the present invention, comprises following component by percentage to the quality:
CaO 17 ~ 25%, is preferably 17 ~ 23%, more preferably 18.2-21.9%;
SiO
223 ~ 31%, be preferably 23 ~ 27%, more preferably 23.7-25.0%;
Al
2o
310 ~ 14%, be preferably 12 ~ 14%, more preferably 12.8-13.8%;
MgO 1 ~ 4%, is preferably 2 ~ 4%, more preferably 2.6-3.8%;
(Na
2o+Li
2o) 10 ~ 15%, be preferably 13-15%, more preferably 13.2-14.5%;
B
2o
31 ~ 8%, be preferably 4 ~ 7%, more preferably 5.5-6.2%;
TiO
21 ~ 6%, be preferably 2 ~ 5%, more preferably 3.4 ~ 4.3%;
BaO4 ~ 8%, is preferably 5 ~ 8%, more preferably 5.5 ~ 6.8%;
F
-10 ~ 13%; Be preferably 10.5-12.5%, more preferably 11-12%.
In covering slag of the present invention, CaO and SiO
2mass ratio is 0.7 ~ 0.9:1.
In covering slag of the present invention, described F
-with CaF
2, NaF, Na
3alF
6in any one form allocate covering slag into.
The melting range of covering slag of the present invention is 850 ~ 950 DEG C, and the range of viscosities of 1300 DEG C is 0.10 ~ 0.13Pas.
In covering slag of the present invention, Na
2o and Li
2the mass ratio of O is 6 ~ 12:1, is preferably 8 ~ 12:1, more preferably 10 ~ 12:1.
The application of covering slag of the present invention, comprises the covering slag be used as containing in aluminium, titaniferous corrosion resistant alloy steel casting process.
The application of covering slag of the present invention, described containing in aluminium, titaniferous corrosion resistant alloy, Al mass percentage is 0-0.3%, Ti mass percentage is 0.8-1.1%.
Principle and advantage
Principle
In covering slag of the present invention, add Al
2o
3and TiO
2main Function is: increase Al in slag
2o
3and TiO
2activity, thus suppress reaction 4 [Al]+3 (SiO
2)=2 (Al
2o
3)+3 [Si], [Ti]+(SiO
2)=(TiO2)+[Si] carry out to the right, decreases SiO
2the amount of being reduced and Al
2o
3with TiO
2recruitment, stabilize the basicity of covering slag, reduce the sex change of covering slag.
In covering slag of the present invention, add B
2o
3main Function be: pass through B
2o
3with the synergy of other components, offset and allocate Al into
2o
3with TiO
2the rising of rear covering slag fusing point, controls the fusing point of covering slag at 850 ~ 950 DEG C, in addition, and B
2o
3covering slag dissolving AlN, TiN etc. can also be increased and be mingled with ability.
In covering slag of the present invention, add Na
2o and Li
2the main purpose of O is: by control Na
2o and Li
2the synergy of the mass ratio of O and the two and other constituent elements, especially Na
2o, Li
2o and B
2o
3synergy, achieve the object reducing covering slag viscosity, also achieve the object reducing covering slag fusing point simultaneously.
The present invention is by control CaO and SiO
2mass ratio is the object of 0.6 ~ 0.9:1 is after the reaction of slag steel reaches balance, still keeps in the reasonable scope, and then guarantees that the crystallizing power of covering slag can not be excessively strong, effectively suppress the generation of slag bar after the basicity raising of covering slag.
The advantage that the present invention compared with prior art has:
1) desulphurization reaction is effectively suppressed.The present invention allocates appropriate Al into
2o
3and TiO
2, add Al in covering slag slag
2o
3with TiO
2activity, effectively inhibit the carrying out to the right of slag steel molecular balance, stabilize the composition of covering slag, and then the physicochemical property of covering slag is controlled in rational scope.
2) high-melting-point AlN, TiN field trash is absorbed effective.The present invention allocates appropriate B into
2o
3can effectively reduce viscosity and the interfacial tension of covering slag, and then improve covering slag slag to high-melting-point AlN, TiN field trash wetability, the melting facilitating field trash absorbs.
3) fusing point and viscosity low.By adding flux Na
2o, Li
2o, B
2o
3under the synergy of each constituent element, reduce fusing point and the viscosity of covering slag, thus increase the consumption of covering slag in casting process, ensure that strand obtains good lubrication.
In sum, a kind of covering slag provided by the invention, have suppression slag/steel reaction, not mutability, viscosity fusing point is stablized, and absorbs the advantages such as high-melting-point AlN, TiN field trash ability is strong.In casting process, this covering slag keeps good mobility, and slag consumption is normal, and covering slag achieves lubrication and heat transfer controlling functions preferably, the defect such as significantly reduce strand lobe and be mingled with, and significantly improves slab quality and productivity effect.When particularly the covering slag that the present invention develops being used for the casting process containing aluminium, titaniferous corrosion resistant alloy steel; effectively can suppress the covering slag under molten condition and the interfacial reaction between alloy; and effectively absorb the contour melting point inclusions of AlN, TiN in crystallizer; improve covering slag penetrating power; realize the slow cooling of meniscus; and then reach minimizing strand crackle and depression, improve the object of slab quality.
Detailed description of the invention
Below in conjunction with example, the invention will be further elaborated, and example only for illustration of the present invention, instead of limits the present invention in any form.
The fusion temperature of covering slag of the present invention, the viscosity of 1300 DEG C adopt metallurgy industry standard YB/T186 and YB/T185 to measure respectively.Crystal property adopts the heat wire method of industry universal to measure.First by covering slag raw material according to target composition weighing mixing in test process; in mortar, ground and mixed is even; then put into intermediate frequency furnace and be warming up to 1500 DEG C of fusing covering slags; stirring after its fusing makes its uniform composition be incubated 10min; again molten state slag is poured into water chilling and obtains glassy state covering slag block, after finally covering slag being milled into powder, carry out heated filament experiment.
Embodiment 1
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 18.2%, SiO
225.0%, Al
2o
313.5%, MgO 2.6%, (Na
2o+Li
2o) 13.2% (Na
2o/Li
2o=11.2:1 mass ratio), B
2o
36.2%, TiO
24.3%, BaO6.0%, F
-11.0%.The basicity CaO/SiO of this covering slag
2be 0.73.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.0%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.55%.
Embodiment 2
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 18.2%, SiO
226.0%, Al
2o
312.8%, MgO 2.8%, (Na
2o+Li
2o) 13.4% (Na
2o/Li
2o=11.4:1 mass ratio), B
2o
35.7%, TiO
23.9%, BaO5.9%, F
-11.3%.The basicity CaO/SiO of this covering slag
2be 0.70.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.3%, Ti mass percentage is the corrosion resistant alloy steel of 1.0%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.09%.
Embodiment 3
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 21.9%, SiO
224.1%, Al
2o
312.8%, MgO 2.6%, (Na
2o+Li
2o) 13.2% (Na
2o/Li
2o=10.5:1 mass ratio), B
2o
35.5%, TiO
23.4%, BaO5.5%, F
-11.0%.The basicity CaO/SiO of this covering slag
2be 0.90.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.38%.
Embodiment 4
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 19.1%, SiO
223.7%, Al
2o
312.9%, MgO 3.8%, (Na
2o+Li
2o) 13.2% (Na
2o/Li
2o=11.5:1 mass ratio), B
2o
35.6%, TiO
23.5%, BaO6.8%, F
-11.4%.The basicity CaO/SiO of this covering slag
2be 0.81.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.3%, Ti mass percentage is the corrosion resistant alloy steel of 0.9%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.33%.
Embodiment 5
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 19.9%, SiO
223.5%, Al
2o
313.8%, MgO 2.7%, (Na
2o+Li
2o) 13.3% (Na
2o/Li
2o=11.5:1 mass ratio), B
2o
35.7%, TiO
23.5%, BaO5.6%, F
-12.0%.The basicity CaO/SiO of this covering slag
2be 0.84.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.0%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.28%.
Embodiment 6
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 19.4%, SiO
224.5%, Al
2o
313.0%, MgO 2.8%, (Na
2o+Li
2o) 14.5% (Na
2o/Li
2o=11.5:1 mass ratio), B
2o
35.5%, TiO
23.5%, BaO5.7%, F
-11.1%.The basicity CaO/SiO of this covering slag
2be 0.79.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.3%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.48%.
Embodiment 7
A kind of new type corrosion resistant alloy steel continuous casting crystallizer protecting residue, its composition quality percentage composition is: CaO 20.5%, SiO
223.7%, Al
2o
312.9%, MgO 3.8%, (Na
2o+Li
2o) 13.5% (Na
2o/Li
2o=11.6:1 mass ratio), B
2o
35.5%, TiO
23.4%, BaO5.7%, F
-11.0%.The basicity CaO/SiO of this covering slag
2be 0.74.The main physical index of the covering slag adopting said method to record is shown in Table 1.Covering slag designed by this embodiment is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is lower than 0.28%.
The main physical parameter of table 1 covering slag
| Performance indications | Fusing point (DEG C) | Viscosity (Pas) at 1300 DEG C | Percent crystallization in massecuite (%) |
| Embodiment 1 | 889 | 0.11 | 65 |
| Embodiment 2 | 895 | 0.12 | 60 |
| Embodiment 3 | 933 | 0.19 | 56 |
| Embodiment 4 | 865 | 0.13 | 48 |
| Embodiment 5 | 950 | 0.23 | 63 |
| Embodiment 6 | 988 | 0.13 | 67 |
| Embodiment 7 | 946 | 0.20 | 40 |
Comparative example 1
The component of covering slag used in this comparative example, is by percentage to the quality: CaO 30%, SiO
230%, Al
2o
35%, MgO 3.8%, (Na
2o+Li
2o) 14% (Na
2o/Li
2o=13:1 mass ratio), B
2o
35.5%, TiO
20%, BaO5.7%, F
-6.0%.The basicity CaO/SiO2 of this covering slag is 1.Covering slag designed by this comparative example is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is 1.63-1.89%.
Comparative example 2
The component of covering slag used in this comparative example, is by percentage to the quality: CaO 15%, SiO
230%, Al
2o
315%, MgO 3.8%, (Na
2o+Li
2o) 14% (Na
2o/Li
2o=13:1 mass ratio), B
2o
30.5%, TiO
27%, BaO5.7%, F
-9.0%.The basicity CaO/SiO2 of this covering slag is 2.Covering slag designed by this comparative example is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is 2.10-2.23%.
Comparative example 3
The component of covering slag used in this comparative example, is: CaO:31.0%, SiO by percentage to the quality
2: 29.5%, Al
2o
3: 5.0%, MgO:2.0%, (Na
2o+Li
2o): 15.9% (Na
2o/Li
2o=7.5:1 mass ratio), B
2o
3: 3.1%, F
-: 13.5%.The basicity CaO/SiO of this covering slag
2be 1.05.Covering slag designed by this comparative example is used for the continuous casting process that Al mass percentage is 0.2%, Ti mass percentage is the corrosion resistant alloy steel of 1.1%; The probability that gained strand lobe and situation about being mingled with occur is 2.50-2.93%.
Can find out that the novel protected slag involved by this patent can well be used for containing the casting process of aluminium, titaniferous corrosion resistant alloy steel by comparative example 1,2,3 and embodiments of the invention 7, the probability that the strand lobe obtained and situation about being mingled with occur is far below other covering slag.
Claims (10)
1. a covering slag, is characterized in that, comprises following component by percentage to the quality:
CaO 17～25％；
SiO
223～31％；
Al
2O
310～14％；
MgO 1～4％；
(Na
2O+Li
2O) 10～15％；
B
2O
31～8％；
TiO
21～6％；
BaO4～8％；
F
-10～13％。
2. a kind of covering slag covering slag according to claim 1, is characterized in that: described covering slag comprises following component by percentage to the quality:
CaO 17-23％；
SiO
223-27％；
Al
2O
312-14％；
MgO 2-4％；
(Na
2O+Li
2O) 13-15％；
B
2O
34-7％；
TiO
22-5％；
BaO 5-8％；
F-10.5-12.5％。
3. a kind of covering slag covering slag according to claim 1, is characterized in that: described covering slag comprises following component by percentage to the quality:
CaO 18.2-21.9％；
SiO
223.7-25.0％；
Al
2O
312.8-13.8％；
MgO 2.6-3.8％；
(Na
2O+Li
2O) 13.2-14.5％；
B
2O
35.5-6.2％；
TiO
23.4-4.3％；
BaO 5.5-6.8％；
F-11-12％。
4. a kind of covering slag covering slag according to claim 1-3 any one, is characterized in that: described in
In covering slag, CaO and SiO
2mass ratio is 0.7 ~ 0.9:1.
5. a kind of covering slag covering slag according to claim 1-3 any one, is characterized in that: in described covering slag, Na
2o and Li
2the mass ratio of O is 6 ~ 12:1.
6. a kind of covering slag covering slag according to claim 5 any one, is characterized in that: in described covering slag, Na
2o and Li
2the mass ratio of O is 8-12:1.
7. a kind of covering slag covering slag according to claim 1-3 any one, is characterized in that: the fusing point of described covering slag is that the viscosity of 850 ~ 950 DEG C, 1300 DEG C is 0.10 ~ 0.13Pas, percent crystallization in massecuite is 40 ~ 70%.
8. a kind of covering slag covering slag according to claim 1-3 any one, is characterized in that: F-is with CaF
2, NaF, Na
3alF
6in any one form allocate covering slag into.
9. the application of covering slag as described in claim 1-3 any one, is characterized in that: comprise the covering slag be used as containing in aluminium, titaniferous corrosion resistant alloy steel casting process.
10. the application of a kind of covering slag according to claim 9, is characterized in that: described containing in aluminium, titaniferous corrosion resistant alloy steel, Al mass percentage is 0 ~ 0.3%.Ti mass percentage is 0.8 ~ 1.1%.
Priority Applications (1)
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|---|---|---|---|
| CN201410710112.6A CN104399922A (en) | 2014-11-28 | 2014-11-28 | Novel corrosion-resistant alloy steel continuous casting powder and application thereof |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201410710112.6A CN104399922A (en) | 2014-11-28 | 2014-11-28 | Novel corrosion-resistant alloy steel continuous casting powder and application thereof |
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|---|---|
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Family
ID=52637625
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- 2014-11-28 CN CN201410710112.6A patent/CN104399922A/en not_active Withdrawn
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Application publication date: 20150311 |