CN101081428A - Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer - Google Patents
Method for preventing liquid fluctuating of continuous casting peritectic steel crystallizer Download PDFInfo
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Abstract
The present invention is method of preventing liquid surface fluctuation in the peritectic steel crystallizer for continuous casting, and belongs to the field of continuous casting technology. The method includes controlling the flow rate of cooling water, controlling the pressure of the last driving roll in the straightening section and adopting peritectic steel protecting slag of new formula. The present invention can eliminate liquid surface fluctuation in the peritectic steel crystallizer and reduce the cracking rate of peritectic steel casting blank greatly.
Description
Technical field
The present invention relates to a kind of method that prevents the continuous cast mold liquid fluctuating, relate in particular to the straight arc conticaster and when the casting peritectic steel, prevent that the method for liquid fluctuating from appearring in crystallizer, belongs to the continuous casting technology field.
Background technology
Straight arc casting machine liquid level fluctuation of crystallizer situation when the peritectic steel of casting [C] about 0.12% is serial happens occasionally, the fluctuation width of cloth reach ± more than the 30mm, often cause significantly reduction of speed casting of casting machine, bring very big influence for production safety, casting machine production capacity and organization of production, and the non-constant of cc billet surface quality, need the scorching cleaning of artificial fire of later stage, directly declare useless when serious.Find that by statistics the peritectic steel liquid fluctuating embodies following characteristics:
Sporadic, not whenever to water time generation, a period of time does not have sometimes, takes place in succession again sometimes, begins behind general second stove to take place;
Liquid fluctuating rear-guard action roller electric current also produces obvious fluctuation, and pulling rate also has certain fluctuation but be not obvious;
Take the mode of reduction of speed casting and increasing cooling water inflow, can alleviate, but can not effect a radical cure fully;
Other steel grade liquid levels of casting are normal, the equipment inspection no significant defect;
Fluctuation back casting billet surface has periodic lateral recesses, similar oscillation mark, but at interval about 100mm.
Fig. 1 is the Fe-C phasor of peritectic point.Know from the Fe-C phasor, metatectic transformation L+ δ → γ can take place at 0.09%～0.17% molten steel in [C] in process of setting, about 0.38% volume contraction takes place, in casting cycle, because the crystallizer cooling velocity is big, general [C] steel grade solidification shrinkage maximum about 0.12%.On the other hand, because other element becomes branch to have influence (table 1) to peritectoid in the steel, reality [C] content of different steel grade generation peritectic reactions is also incomplete same.
Table 1 alloying element causes the coefficient % that the peritectoid district changes
| Si | Mn | P | S | Cu | Ni | Cr | Mo | W | Ti | Co | |
| L D A | +0.33 +0.08 +0.22 | -0.07 -0.02 -0.03 | -0.06 -0.04 -0.06 | -0.15 -0.25 -0.48 | -0.20 -0.06 -0.08 | -0.17 -0.05 -0.07 | +0.11 +0.03 +0.05 | +0.06 +0.02 +0.05 | +0.12 +0.03 +0.11 | +0.08 +0.03 +0.09 | -0.03 -0.01 -0.01 |
In crystallizer, the base shell can break away from and forms air gap because of shrinking excessive and crystallizer wall copper coin, influence the heat transfer of base shell, thus the base shell solidify grow slack-off, the attenuation of base shell; And along with the moving down of base shell, because the effect of ferrostatic pressure, the base shell sticks crystallizer wall again, and the base shell speed of growth is restored, and referring to Fig. 2, Fig. 3, this also is the uneven basic reason of peritectic steel solidified shell.
And the inhomogeneous slab surface crack that very easily causes of peritectic steel crystallizer base shell growth, thereby be when secondary cools off, to adopt weak cold system to avoid the extension of crackle traditionally, but this can cause two cold-zone casting blank shell decreased growths and base shell surface temperature higher relatively, and these 2 be the factor of aggravation casting blank bulging tendency.Therefore, generally speaking, all can take to reduce pulling rate when liquid fluctuating takes place, increase that the secondary cooling water amount increases shell thickness, the way that reduces casting blank surface temperature is alleviated.But thereby the strand temperature is crossed the low aligning transverse crack that must cause the low temperature aligning to cause casting billet surface, especially true to the steel grade that contains alloying elements such as [Nb], [V], when producing the cut deal steel, will cause large crackle waste product of finished product because of the not enough crackle of compression ratio can not heal.
In theory, the base shell in the casting machine secondary cooling zone is because the effect meeting of ferrostatic pressure produces bulge between two pair rollers, its bulge amount can be obtained by formula (1), and the cube of bulge amount and shell thickness is inversely proportional to.
Normal evenly its thickness of base shell of growth is enough to guarantee the bulge amount in tolerance zone, can not cause the bigger variation of base shell cavity volume; And the weak bulge deformation of part between fan-shaped section two pair rollers will be much larger than the normal part of base shell in the base shell of peritectic steel inhomogeneous growth, thereby cause the obvious drop of liquid level, and there is a process that pushes back again when next roller in the base shell, this moment liquid level will on gush, so far, liquid fluctuating is completed into.The bulge of strand can cause the resistance of strand to increase, the dynamo-electric stream fluctuation of straightening cause of increased when this also is liquid fluctuating.
Wherein, δ: strand is length direction bulge amount between two rollers; C
1: material coefficient; P: ferrostatic pressure; L: roller spacing; E: the high temperature modulus of elasticity of steel; D: thickness of solidified slab shell in secondary; Bw: strand stroke; Vc: pulling rate; α: temperature and material coefficient.
Because the meeting of fluctuation each time of liquid level forms new weak link at the meniscus place, and this is the origin of new round fluctuation, therefore in case produce liquid fluctuating, is difficult to suppress (even significantly reduction of speed even temporary stoppage are all like this).The a pair of fan-shaped section of the every process of weak base shell is pressed from both sides the process that rod all has a bulge and pushes back, thereby causes the cyclic fluctuation of liquid level.Because of the casting machine inconsistency of roller spacing from top to bottom,, but a plurality of weak spots place, front and back bulge, push back Volume Changes and comprehensively add up the cycle that the back forms so the cycle of fluctuation was not equal to through the time between certain two pair roller.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, the method for liquid level fluctuation of crystallizer is provided when providing a kind of continuous casting that has improved to produce peritectic steel.Utilize this method can improve cc billet surface quality significantly.
The present invention is achieved by following technical proposals:
A kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer:
Crystallizer cooling water inflow when casting machine is cast peritectic steel is controlled to be: flow rate of water flow 4.8～5.5m/s, jet density 1500～1800l/m
2/ min;
Simultaneously, the final stage driven roller pressure of control aligning section is cold base pressure; And,
Adopt the peritectic steel covering slag of following compositions and percentage by weight: SiO simultaneously
2: 25～35, Fe
2O
3: 0.75～1.10, CaO:35～39, Al
2O
3: 1.78～2.20, MgO:3.20～3.50, C:2.80～3.20, H
2O:0.1～0.5, K
2O:0.20～0.60, Na
2O:8.80～9.25, F:6.50～7.00, R:1.00～1.50, all the other are impurity.
Adopt technical solutions according to the invention, eliminated the liquid fluctuating phenomenon of peritectic steel, originally produce certain peritectic steel, basically since the casting of first stove, liquid fluctuating is very serious, and the 3 stove steel of often casting just are forced to plan and interrupt, after taking measure of the present invention, thoroughly eliminate the liquid fluctuating phenomenon, the casting plan is not limited by steel grade, and the slab quality defective descends significantly.The strand cracking frequency of peritectic steel is reduced to below 10% by original 30%, therefore is beneficial to and applies.
Description of drawings
Fig. 1 is the Fe-C phasor of peritectic point;
Fig. 2 is that low, high-carbon steel solidified shell is along casting direction growth schematic diagram;
Fig. 3 is that the peritectic steel solidified shell is along casting direction growth schematic diagram;
Fig. 4 is the casting blank bulging schematic diagram;
Fig. 5 is the new and old vibration parameters contrast of a peritectic steel schematic diagram, and wherein, 1 is raw parameter, and 2 for improving the back parameter.
The specific embodiment
Embodiment 1:
The inhomogeneities of initial solidification shell is to cause the basic reason of peritectic steel liquid fluctuating in the crystallizer, therefore, guarantees that the uniform and stable of crystallizer initial solidification shell is the key point of dealing with problems.Theory and practice all proves, the inhomogeneous growth that crystallizer is weak cold, the base shell can be effectively controlled in slow cooling.
Straight arc casting machine is designed to the long straight plate crystallizer of 900mm, broadside discharge is 3600l/min, about 5 ℃ of the Inlet and outlet water temperature difference, the intensity of cooling of strand in crystallizer be apparently higher than former full arc shape casting machine, and this also is former full arc shape casting machine peritectic steel liquid level one of the reason of situation that seldom fluctuates.Therefore, by calculating and the reference 900 long full arc shape casting machine crystallizer water yields, present embodiment provides a kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer, one of concrete measure is exactly the crystallizer cooling water inflow when having reduced casting machine casting peritectic steel, 7.02m/s when being about to flow rate of water flow by design drops to the scope of 4.8～5.5m/s, the 2105l/m with jet density during by design
2/ min drops to 1500～1800l/m
2/ min is beneficial to suppress the inequality of initial solidification shell.
The new casting machine of straight arc is owing to adopt the technology of dynamically gently depressing, fan-shaped section is the SMART fan-shaped section, control the roll gap of non-live-roller by position sensor control hydraulic cylinder travel, cancelled distance block, driven roller is then by hot base pressure (80% of molten steel maximum static pressure power, 17～38bar) directly act on the strand, and new casting machine respectively has a pair of driven roller for 3～10 sections.When liquid fluctuating, because the increase of resistance of billet withdrawal, the driven roller current fluctuation is very big, and the corresponding generation of throwing power is than great fluctuation process, and casting speed also produces fluctuation, is unfavorable for the control of liquid level.Final stage (10# section) the driven roller place strand of considering the aligning section solidifies fully, and 10# section driven roller pressure changes cold base pressure limit in will casting, and has improved throwing power, guarantees the stable of casting speed, also helps the stable of liquid level.
Before technology of the present invention was not tested, used covering slag was the medium carbon steel slag during continuous casting peritectic steel, and the scope of application is the steel grade of [C]=0.08～0.20%, did not fill a part particularity of considering peritectic steel in its design.Theoretical research shows that when crystallizer protecting residue adopted higher basicity, viscosity and fusing point, crystalline phase increased in the slag film between copper plate of crystallizer and initial solidification shell, and glassy phase reduces, and can slow down the heat transfer between base shell and the crystallizer, and the base shell solidifies more even.For this reason, present embodiment provides a kind of peritectic steel privacy protection slag, uses back control liquid fluctuating effect very obvious, has eliminated the liquid fluctuating phenomenon basically.
The composition and the percentage by weight of described peritectic steel privacy protection slag are respectively: SiO
2: 25～35, Fe
2O
3: 0.75～1.10, CaO:35～39, Al
2O
3: 1.78～2.20, MgO:3.20～3.50, C:2.80～3.20, H
2O:0.1～0.5, K
2O:0.20～0.60, Na
2O:8.80～9.25, F:6.50～7.00, R:1.00～1.50, all the other are impurity.
After tested, the fusing point of the covering slag of this kind composition is: 1130～1160 ℃, viscosity (Pa.s) is 0.140～0.170, basicity 1.40-1.60.
By adopting above measure, eliminated the situation of liquid fluctuating basically, brought into play enormous function for improving the casting machine production capacity, improve slab quality and increasing economic benefit.
Originally liquid fluctuating all takes place in the each basically production of certain peritectic steel (WL440), the strand cracking frequency reaches 30% of all over products, after using the described special-purpose slag of present embodiment, eliminated the liquid fluctuating phenomenon, slab quality is greatly improved, and the strand cracking frequency has reduced more than 50% on original basis.
Embodiment 2:
The difference of present embodiment and embodiment 1 only is that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 25.25, Fe
2O
3: 1.07, CaO:35.06, Al
2O
3: 2.18, MgO:3.23, C:3.18, H
2O:0.15, K
2O:0.55, Na
2O:8.82, F:6.92, R:1.17, all the other are impurity.After tested, the fusing point of the covering slag of this kind composition is: 1145 ℃, viscosity (Pa.s) is 0.158.
Experimental results demonstrate that the covering slag of the described ratio of present embodiment can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully.
Embodiment 3:
The difference of present embodiment and embodiment 1 only is that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 33.49, Fe
2O
3: 0.85, CaO:38.5, Al
2O
3: 1.82, MgO:3.48, C:2.83, H
2O:0.42, K
2O:0.26, Na
2O:9.24, F:6.53, R:1.42, all the other are impurity.After tested, the fusing point of the covering slag of this kind composition is: 1132 ℃, viscosity (Pa.s) is 0.168.
Experimental results demonstrate that the covering slag of described ratio can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully.
Embodiment 4:
The difference of present embodiment and embodiment 1 only is that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 29.25, Fe
2O
3: 0.95, CaO:37.81, Al
2O
3: 1.98, MgO:3.31, C:3.09, H
2O:0.3, K
2O:0.48, Na
2O:9.01, F:6.99, R:1.29, all the other are impurity.After tested, the fusing point of the covering slag of this kind composition is: 1154 ℃, viscosity (Pa.s) is 0.143.
Experimental results demonstrate that the covering slag of described ratio can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully.
Embodiment 5:
The special-purpose slag of peritectic steel is because crystalline phase increase in the slag film, glassy phase reduces, may cause lubricant effect to descend, base shell bonding tendency increases, therefore, present embodiment is on the basis of embodiment 1, suitably adjust the vibration parameters of peritectic steel, the control negative slip time is increased to 0.17～0.25s by 0.11 original～0.15s, adopts the non-sinusoidal oscillation mode simultaneously, improve the security of casting from device parameter, thereby guaranteed carrying out smoothly of production.
The hydraulic non-sine oscillation system that straight arc casting machine adopts has the characteristics of dynamic adjustable in shake (f), amplitude (s) and the casting of non-sine coefficient parameters such as (τ) frequently, use the vibrate in opposite phase mode on the process parameters design---amplitude rises with pulling rate and increases progressively, shaking rises with pulling rate frequently successively decreases, to guarantee negative slip time (tn) substantially constant under the different casting condition.Fig. 5 is the new and old vibration parameters contrast of a peritectic steel schematic diagram, and wherein, 1 is raw parameter, and 2 for improving the back parameter, and Vc is the casting machine pulling rate.
Embodiment 6:
Present embodiment provides a kind of technical scheme that liquid level fluctuation of molten steel adopts that prevents when requiring casting thickness to be the strand of 210mm:
Adopting wide discharge of crystallizer is 3300L/Min, and leptoprosopy discharge is 442L/Min;
Crystallizer cooling water inflow when casting machine is cast peritectic steel is controlled to be: flow rate of water flow 5.0m/s, jet density 1650l/m
2/ min;
Adopting the concrete composition of peritectic steel covering slag is (wt%): SiO
2: 27.39, Fe
2O
3: 0.83, CaO:36.28, Al
2O
3: 1.82, MgO:3.39, C:3.20, H
2O:0.1, K
2O:0.21, Na
2O:9.25, F:6.50, R:1.50, all the other are impurity;
The final stage driven roller pressure of control aligning section is 180～220bar;
Simultaneously, control negative slip (mold oscillation parameter) time is 0.20～0.22s;
Experiment showed, that the described method of present embodiment can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully, the strand cracking frequency of peritectic steel is reduced to 4.6% simultaneously.
Embodiment 7:
It is a kind of when requiring to process thickness and being the strand of 230mm that present embodiment provides, and adopting wide discharge of crystallizer is 3600L/Min, and leptoprosopy discharge is 500L/Min;
Crystallizer cooling water inflow when casting machine is cast peritectic steel is controlled to be: flow rate of water flow 5.3m/s, jet density 1700l/m
2/ min;
Simultaneously, the final stage driven roller pressure of control aligning section is 195bar; And,
Adopting the concrete composition of peritectic steel covering slag is (wt%): SiO
2: 35, Fe
2O
3: 0.75, CaO:35.28, Al
2O
3: 2.20, MgO:3.50, C:2.80, H
2O:0.5, K
2O:0.20, Na
2O:8.80, F:7.00, R:1.00, all the other are impurity;
Simultaneously, the control negative slip time is 0.23～0.24s;
Experiment showed, that the described method of present embodiment can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully, the strand cracking frequency of peritectic steel is reduced to 3.2% simultaneously.
Embodiment 8: present embodiment provides a kind of when requiring to process thickness and being the strand of 250mm, and adopting wide discharge of crystallizer is 3600L/Min, and leptoprosopy discharge is 563L/Min.
Crystallizer cooling water inflow when casting machine is cast peritectic steel is controlled to be: flow rate of water flow 4.9m/s, jet density 1500l/m
2/ min;
Simultaneously, the final stage driven roller pressure of control aligning section is 215bar; And,
Adopting the concrete composition of peritectic steel covering slag is (wt%): SiO
2: 32.59, Fe
2O
3: 0.90, CaO:37.36, Al
2O
3: 2.00, MgO:3.40, C:2.56, H
2O:0.35, K
2O:0.51, Na
2O:9.03, F:6.75, R:1.33, all the other are impurity;
Simultaneously, the control negative slip time is 0.18～0.19s;
Experiment showed, that the described method of present embodiment can reach the liquid fluctuating phenomenon when eliminating the peritectic steel casting fully, the strand cracking frequency of peritectic steel is reduced to 4.1% simultaneously.
Claims (10)
1. method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer is characterized in that:
Crystallizer cooling water inflow when casting machine is cast peritectic steel is controlled to be: flow rate of water flow 4.8～5.5m/s, jet density 1500～1800l/m
2/ min;
Simultaneously, the final stage driven roller pressure of control aligning section is cold base pressure; And,
Adopt the peritectic steel covering slag of following compositions and percentage by weight: SiO simultaneously
2: 25～35, Fe
2O
3: 0.75～1.10, CaO:35～39, Al
2O
3: 1.78～2.20, MgO:3.20～3.50, C:2.80～3.20, H
2O:0.1～0.5, K
2O:0.20～0.60, Na
2O:8.80～9.25, F:6.50～7.00, R:1.00～1.50, all the other are impurity.
2. a kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer according to claim 1 is characterized in that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 25.25, Fe
2O
3: 1.07, CaO:35.06, Al
2O
3: 2.18, MgO:3.23, C:3.18, H
2O:0.15, K
2O:0.55, Na
2O:8.82, F:6.92, R:1.17, all the other are impurity.
3. a kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer according to claim 1 is characterized in that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 33.49, Fe
2O
3: 0.85, CaO:38.5, Al
2O
3: 1.82, MgO:3.48, C:2.83, H
2O:0.42, K
2O:0.26, Na
2O:9.24, F:6.53, R:1.42, all the other are impurity.
4. a kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer according to claim 1 is characterized in that the concrete composition of described peritectic steel covering slag is (wt%): SiO
2: 29.25, Fe
2O
3: 0.95, CaO:37.81, Al
2O
3: 1.98, MgO:3.31, C:3.09, H
2O:0.3, K
2O:0.48, Na
2O:9.01, F:6.99, R:1.29, all the other are impurity.
5. according to claim 1,2,3 or 4 described a kind of methods that prevent liquid fluctuating of continuous casting peritectic steel crystallizer, it is characterized in that controlling the negative slip time is 0.17～0.25s.
6. a kind of method that prevents liquid fluctuating of continuous casting peritectic steel crystallizer according to claim 5, it is characterized in that controlling the negative slip time is 0.20～0.22s; The final stage driven roller pressure of control aligning section is 180～220bar.
7. according to claim 1,2,3 or 4 described a kind of methods that prevent liquid fluctuating of continuous casting peritectic steel crystallizer, the crystallizer cooling water inflow when it is characterized in that casting machine cast peritectic steel is controlled to be: flow rate of water flow 5.3m/s, jet density 1700l/m
2/ min.
8. according to claim 1,2,3 or 4 described a kind of methods that prevent liquid fluctuating of continuous casting peritectic steel crystallizer, when it is characterized in that processing thickness and being the strand of 210mm, adopting wide discharge of crystallizer is 3300L/Min, and leptoprosopy discharge is 442L/Min.
9. according to claim 1,2,3 or 4 described a kind of methods that prevent liquid fluctuating of continuous casting peritectic steel crystallizer, when it is characterized in that processing thickness and being the strand of 230mm, adopting wide discharge of crystallizer is 3600L/Min, and leptoprosopy discharge is 500L/Min.
10. according to claim 1,2,3 or 4 described a kind of methods that prevent liquid fluctuating of continuous casting peritectic steel crystallizer, when it is characterized in that processing thickness and being the strand of 250mm, adopting wide discharge of crystallizer is 3600L/Min, and leptoprosopy discharge is 563L/Min.
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| IT1267243B1 (en) * | 1994-05-30 | 1997-01-28 | Danieli Off Mecc | CONTINUOUS CASTING PROCEDURE FOR PERITECTIC STEELS |
| JP3019859B1 (en) * | 1999-06-11 | 2000-03-13 | 住友金属工業株式会社 | Continuous casting method |
| KR100623908B1 (en) * | 2004-06-23 | 2006-09-19 | 스톨베르그 앤드 삼일 주식회사 | Fluorine-free mold flux for the continuous casting of steel and method for producing the same |
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