CN114669722A - Slag avoiding method for improving purity of casting blank - Google Patents
Slag avoiding method for improving purity of casting blank Download PDFInfo
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- CN114669722A CN114669722A CN202210583760.4A CN202210583760A CN114669722A CN 114669722 A CN114669722 A CN 114669722A CN 202210583760 A CN202210583760 A CN 202210583760A CN 114669722 A CN114669722 A CN 114669722A
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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
- B22D11/108—Feeding additives, powders, or the like
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/112—Treating the molten metal by accelerated cooling
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Abstract
The invention relates to a slag avoiding method for improving purity of a casting blank, belonging to the technical field of continuous casting, and the method comprises the following steps: determining the number of air blowing guns and the position distribution of the air blowing guns according to the width of the steel strip, and arranging the air blowing guns according to the number and the position distribution; adding a slag modifier into a feeding zone to enable the covering slag in the feeding zone to be gathered and have fluidity; introducing gas into the gas blow gun and inserting the gas blow gun into the molten steel so as to discharge the molten slag out of the feeding zone and expose the molten steel in the feeding zone; adding slag thickener to the edge of the feeding zone and adjusting the flow of the gas; and starting the feeding belt device, and feeding the steel belt into the feeding belt region. The invention can avoid the slag inclusion problem in the steel strip feeding process of the continuous casting crystallizer, ensure the smooth operation of the steel strip feeding and improve the solidification quality and the purity of a casting blank.
Description
Technical Field
The invention relates to the technical field of continuous casting, in particular to a slag avoiding method for improving purity of a casting blank.
Background
The technology of feeding steel strips into a continuous casting crystallizer is an effective means for improving the solidification quality of continuous casting billets. And a steel strip is continuously fed into the crystallizer, so that the superheat degree of the central melt of the casting blank can be reduced through melting and heat absorption of the steel strip. Meanwhile, a semi-molten dendritic crystal structure generated by melting the steel strip can be used as a nucleation mass point of molten steel, so that the central equiaxial crystal rate of a casting blank is improved, central segregation and precipitation are inhibited, and the density of the cast ingot is increased. However, the cold steel strip contacts with the slag in the strip feeding process, and the high-temperature slag adheres to the surface of the steel strip to be solidified and enters the casting blank along with the steel strip, so that slag inclusion defects are generated, the size and the number of inclusions are increased, the purity of the casting blank is reduced, and the quality of the casting blank is seriously deteriorated.
To avoid the slag inclusion problem during the feeding of the strip into the crystallizer, three methods of preheating the steel strip, vibrating the strip and feeding the strip into the slag avoiding device have been developed. Although preheating the steel strip can reduce the probability of slag inclusion of the steel strip, the excessive initial temperature of the steel strip can reduce the heat absorbed by the steel strip and reduce the improvement effect of the strip feeding process on the solidification structure. The steel belt is vibrated, so that slag nearby the steel belt can be discharged to two sides to avoid slag inclusion, but the slag generates large fluctuation along with the vibration of the crystallizer in the continuous casting process, and if the continuous casting production parameters are improperly controlled, the slag is likely to contact with the steel belt to cause the slag inclusion problem, and the purity of a casting blank is reduced. The patent CN104325103A discloses a "protective casting method for feeding steel strip by crystallizer", which divides the surface of molten steel into feeding zone and non-feeding zone by a protective sleeve, adds low melting point protective slag into the feeding zone and feeds the steel strip. However, the adoption of the low-melting-point covering slag still has the risk of slag inclusion, so that the purity of the casting blank is reduced. The patent CN105149536A discloses a "device and method for removing slag in steel strip feeding of gas shielded continuous casting crystallizer" and the patent CN206065356U discloses a "protective device for variable slag line in steel strip feeding of continuous casting crystallizer" and a continuous casting crystallizer "which divide the surface of molten steel into a feeding zone and a non-feeding zone by the slag removing device or the protective device, remove the slag in the feeding zone to expose the molten steel, and introduce a protective atmosphere into the feeding zone to feed the steel strip to avoid slag inclusion. However, the fluidity of the molten steel in the slag discharging device or the protective device is poor, and after the steel strip is fed, the temperature of the molten steel in the slag discharging device or the protective device is rapidly reduced, so that the molten steel is solidified when the temperature is serious, and the production of continuous casting strip feeding is interrupted.
Therefore, it is necessary to develop a slag avoiding method for improving the purity of a casting blank, which is used for avoiding the slag inclusion problem in the steel strip feeding process of the continuous casting crystallizer, ensuring the smooth operation of the steel strip feeding, and improving the solidification quality and the purity of the casting blank.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a slag avoiding method for improving the purity of a casting blank.
In order to achieve the purpose, the invention provides the following scheme:
a slag avoiding method for improving purity of a casting blank comprises the following steps:
determining the number of air blowing guns and the position distribution of the air blowing guns according to the width of the steel strip, and arranging the air blowing guns according to the number and the position distribution;
adding a slag modifier into a feeding zone to enable the covering slag in the feeding zone to be gathered and have fluidity;
introducing gas into the gas blow gun and inserting the gas blow gun into the molten steel so as to discharge the molten slag out of the feeding zone and expose the molten steel in the feeding zone;
adding slag thickener to the edge of the feeding zone and adjusting the flow of the gas;
and starting the feeding belt device, and feeding the steel belt into the feeding belt region.
Preferably, said arranging said air blowing guns according to said number and said position distribution comprises:
arranging the air blowing guns in two rows in parallel, wherein the air blowing guns in each row are arranged in a straight line at equal intervals, and the symmetrical surfaces of one row of air blowing guns and the other row of air blowing guns are parallel to the wide surface of the steel strip; the number of the air blowing guns in any row is not less than w/60, wherein w is the width of the steel strip, and the unit of w is mm;
and when the number of the air blow guns is more than 1, controlling the distance between the adjacent air blow guns to be 40mm to 67mm, controlling the distance between the first air blow gun and the last air blow gun in any row to be w-20mm to w +20mm, and controlling the vertical distance between the gun heads of the air blow guns and the steel strip to be 10mm to 30 mm.
Preferably, the material of a gun head of the air blow gun is a refractory material, and the diameter of a gun head gas channel is 2.5mm to 4.5 mm.
Preferably, the mass of the slag modifier is 80 to 150 g; the length of the feeding belt area is w +100mm, w is the width of the steel belt, and the width of the feeding belt area is 100mm to 120 mm.
Preferably, the weight percentage of the chemical components of the slag modifier is as follows: SiO 22: 38.2 to 52.5%, CaO: 18.3 to 32.1 percent of Na2O: 13.5% to 15.7%, K2O: 3.3% to 4.5%, Li2O: 1.6% to 2.3%, MnO: 3.2 to 4.2% of Al2O3Not more than 3.0 percent, and not more than 3.0 percent of MgO; na (Na)2Weight percent of O and K2The ratio of the weight percent of O is 3 to 4.
Preferably, the introducing gas into the gas blow gun and inserting the gas blow gun into the molten steel include:
before the air blow gun is inserted into the molten steel, introducing nitrogen or argon into the air blow gun, and controlling the flow rate of air before the gun head of each air blow gun is inserted to be 150L/min-180L/min;
adjusting the blowingControlling the horizontal included angle between the air blow gun and the liquid level of the molten steel to be 70-80 degrees in the direction of the air blow gun, inserting the air blow gun into the molten steel in the feeding zone, and controlling the depth of the air blow gun inserted into the molten steel to be (0.35+ K)1X h) x L, wherein K1Is a first parameter, K1The value of (a) is 0.008 to 0.012, h is the slag thickness, h is 5mm to 40mm, L is the depth of the immersion nozzle inserted into the molten steel, and L is 150mm to 500 mm.
Preferably, the slag thickener comprises the following chemical components in percentage by weight: CaO: 62.3 to 73.5 percent of Na2SiO3·9H2O: 5.8 to 8.2 percent.
Preferably, the method further comprises the following steps:
before the slag thickener is used, uniformly mixing the slag thickener to prepare particles with the diameter of 2mm to 4 mm;
uniformly adding the particles to the feeding zone so as to thicken the slag in the feeding zone to form a layer of viscous protective slag ring with the ring width of 30-50 mm.
Preferably, said feeding of the steel strip into the feeding zone comprises:
a vibrating steel strip is fed into the crystallizer.
Preferably, the method further comprises the following steps:
when molten steel components contain nitrogen, introducing nitrogen into the air blow gun;
when the molten steel contains no nitrogen, argon is introduced into the air blowing gun.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a slag avoiding method for improving purity of a casting blank. The diameter, the insertion depth and the gas flow of a gas channel of the gun head of the gas blow gun are controlled according to the thickness of the slag layer, so that the exposed area of the molten steel is stable. Meanwhile, the slag modifier and the thickening agent are sequentially added to the periphery of the feeding zone, so that the viscosity of surrounding slag is increased, slag is adsorbed to form a slag ring, and the exposed area of the molten steel is further stabilized. By the means, the steel belt can be effectively prevented from contacting the liquid slag layer, the slag inclusion problem in the steel belt feeding process of the crystallizer is effectively avoided, and the purity of the casting blank is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a slag avoidance method for improving purity of a casting blank in an embodiment of the invention;
FIG. 2 is a side view of a schematic structural diagram in an embodiment provided by the present invention;
FIG. 3 is a top view of a schematic structural diagram in an embodiment provided by the present invention;
FIG. 4 is a schematic diagram showing the statistical results of the width, length and area of a molten steel exposed area of a continuous casting billet in the embodiment of the invention;
fig. 5 is a diagram showing the statistical results of the diameters and the number of inclusions of the slab in the example provided by the present invention.
Description of reference numerals:
1-solid slag layer, 2-liquid slag layer, 3-air blowing gun, 4-steel strip, 5-steel liquid exposed area, 6-steel liquid, 7-immersion nozzle, 8-slag ring, w-steel strip width, H-slag thickness, H-air blowing gun insertion depth, a-vertical distance between the air blowing gun head and the steel strip, Δ x-adjacent air blowing gun spacing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
The invention aims to provide a slag avoiding method for improving the purity of a casting blank, which can effectively prevent a steel belt from contacting a liquid slag layer, can effectively avoid the problem of slag inclusion in the process of feeding the steel belt by a crystallizer, and improves the solidification quality and the purity of the casting blank.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method for preventing slag from being fed into a steel strip of a continuous casting crystallizer in an embodiment provided by the invention, and as shown in fig. 1, the invention provides a method for preventing slag from improving purity of a casting blank, which comprises the following steps:
step 100: determining the number of air blowing guns and the position distribution of the air blowing guns according to the width of the steel strip, and arranging the air blowing guns according to the number and the position distribution;
step 200: adding a slag modifier into a feeding zone to enable the covering slag in the feeding zone to be gathered and have fluidity;
step 300: introducing gas into the gas blow gun and inserting the gas blow gun into the molten steel so as to discharge the molten slag out of the feeding zone and expose the molten steel in the feeding zone;
step 400: adding slag thickener to the edge of the feeding zone and adjusting the flow of the gas;
step 500: and starting the feeding belt device, and feeding the steel belt into the feeding belt region.
Preferably, said arranging said air blowing guns according to said number and said position distribution comprises:
arranging the air blow guns 3 in two rows in parallel, wherein the air blow guns 3 in each row are arranged in a straight line at equal distance, and the symmetrical surfaces of one row of air blow guns 3 and the other row of air blow guns 3 are parallel to the wide surface of the steel strip 4; the number of the air blowing guns 3 in any row is not less than w/60, wherein w is the width of the steel strip, and the unit of w is mm;
when the number of the air blow guns 3 is larger than 1, the distance between the adjacent air blow guns 3 is controlled to be 40mm to 67mm, the distance between the first air blow gun and the last air blow gun in any row is controlled to be w-20mm to w +20mm, and the vertical distance between the gun head of the air blow gun 3 and the steel strip 4 is controlled to be 10mm to 30 mm.
Fig. 2 and 3 are a side view and a top view, respectively, of a schematic structural view in an embodiment provided by the present invention, and as shown in fig. 2 and 3, a side of the continuous casting mold flux contacting molten steel is heated by high-temperature molten steel to be melted to form a liquid slag layer 2; the side of the continuous casting mold flux, which is in contact with air, is cooled by the air, the temperature is low, and a solid slag layer 1 is formed, and the method in the embodiment totally comprises the following five steps:
(1) confirming the quantity and position distribution of the air blowing guns according to the width (w) of the steel strip; the air blow guns 3 are arranged in two rows in parallel, the air blow guns 3 in each row are arranged in a straight line at equal distance, and the symmetrical surfaces of one row of air blow guns 3 and the other row of air blow guns 3 are parallel to the wide surface of the steel strip 4; the number n of the air blowing guns in one row is more than or equal to w/60, the numbers of the air blowing guns are 1# air blowing gun, 2# air blowing gun and 3# air blowing gun … … n # air blowing gun in sequence, when n is more than or equal to 2, the distance between adjacent air blowing guns is x = 40-67 mm, the distance between the 1# air blowing gun and the n # air blowing gun is = w +/-20 mm, the vertical distance a = 10-30 mm between the gun heads of the air blowing guns 3 and the steel belt 4 is controlled, and the number and the position distribution of the air blowing guns 3 in the other row are the same;
(2) adding a slag modifier into the feeding zone; after the continuous casting covering slag is melted, uniformly adding 80-150 g of slag modifier into the feeding belt area to ensure that the covering slag in the feeding belt area is gathered and has good fluidity; the feeding belt zone is rectangular, the length = w +100mm, and the width = 100-120 mm;
(3) introducing gas into the gas blow gun 3 and inserting the gas blow gun 3 into the molten steel 6; before the air blow gun 3 is inserted into the molten steel 6, introducing nitrogen or argon into the air blow gun 3, and controlling the flow of the air before the insertion of each gun head to be 150-180L/min. Adjusting the direction of the air blow gun 3, controlling the horizontal included angle between the air blow gun 3 and the liquid level of the molten steel to be 70-80 degrees, inserting the air blow gun 3 into the molten steel 6 in the feeding zone, and controlling the insertion depth H = (0.35+ K) of the air blow gun into the molten steel1×h)×L，K1H is the depth of the air blow gun inserted into the molten steel, the unit is mm, H is the thickness of the molten slag, the unit is mm, and L is the depth of the submerged nozzle inserted into the molten steel, the unit is mm; bubbles are generated through blowing, the bubbles float upwards to drive the molten steel 6 to flow upwards, the molten steel 6 rolls on the surface of a molten pool, and slag is discharged from a feeding zone so that the molten steel 6 in the feeding zone is exposed;
(4) adding a slag thickener to the feeding zone and adjusting the gas flow; after the air blow gun 3 is inserted for 40-60 s and the exposed area of the molten steel in the feeding zone is stable, adding 20-40 g of slag thickening agent into the slag at the edge of the feeding zone, further increasing the viscosity of the slag around the feeding zone, forming a high-viscosity protective slag ring (slag ring 8), adsorbing the slag in the feeding zone, and preventing the slag outside the feeding zone from entering the feeding zone; adjusting the flow of the air blow gun 3, and controlling the flow Q =40-K of the inserted air2×H0.92+K3×h1.24Wherein Q is the gas flow of the gas blow gun, and the unit is L/min, K2Is a second parameter, K2=0.12~0.14，K3Is a third parameter, K3=0.6~0.7；
(5) And starting the feeding belt device, and feeding the steel belt 4 into the feeding belt region.
Further, the step (1) of controlling the distance x = 40-67 mm between the adjacent air blow guns is to ensure that the molten steel 6 between the adjacent air blow guns 3 is completely exposed; the vertical distance a = 10-30 mm between the gun head of the air blow gun 3 and the steel strip 4 is controlled to enable bubbles of the air blow gun 3 to float upwards near the steel strip 4 and ensure that a stable molten steel bare area 5 is generated near the steel strip 4.
Preferably, the material of the gun head of the air blow gun 3 is refractory material, and the diameter of the air channel of the gun head is 2.5mm to 4.5 mm.
Preferably, the mass of the slag modifier is 80 to 150 g; the length of the feeding belt area is w +100mm, w is the width of the steel belt, and the width of the feeding belt area is 100mm to 120 mm.
Preferably, the weight percentage of the chemical components of the slag modifier is as follows: SiO 22: 38.2 to 52.5%, CaO: 18.3 to 32.1 percent of Na2O: 13.5% to 15.7%, K2O: 3.3% to 4.5%, Li2O: 1.6% to 2.3%, MnO: 3.2 to 4.2% of Al2O3Not more than 3.0 percent, and not more than 3.0 percent of MgO; na (Na)2Weight percent of O and K2The weight percentage ratio of O is 3 to 4, and the balance is Fe2O3And inevitable impurities.
Further, the chemical composition (wt.%) of the slag modifier in step (2) may also be: SiO 22：42.3~49.5%，CaO：22.1~28.5%，Na2O：13.5~15.7%，K2O：3.3~4.5%，Li2O：1.6~1.8%，MnO：3.2~3.5%，Al2O3Not more than 3.0 percent, not more than 3.0 percent of MgO and the balance of Fe2O3And unavoidable impurities, control of Na2O/K2O=3~3.5。
Specifically, the slag modifier in the step (2) meets Na2O/K2O = 3-4, can make modifier fully expand 10-15 times, can adsorb liquid slag, and have certain mobility.
Further, the modifier in the step (4) contains 1.6-2.3% of Li2O and 3.2-4.2% MnO can ensure that the viscosity of the modified slag is 0.4-0.7 Pa.s, and the modified slag has stronger slag adsorption capacity and better fluidity.
Preferably, the introducing gas into the gas blow gun and inserting the gas blow gun 3 into the molten steel include:
before the air blow gun is inserted into the molten steel 6, introducing nitrogen or argon into the air blow gun, and controlling the air flow rate of the gun head of each air blow gun to be 150L/min to 180L/min before the gun head of each air blow gun is inserted;
adjusting the direction of the air blow gun 3, controlling the horizontal included angle between the air blow gun 3 and the liquid level of the molten steel to be 70-80 degrees, inserting the air blow gun 3 into the molten steel 6 of the feeding zone, and controlling the depth of the air blow gun inserted into the molten steel to be (0.35+ K)1X h) x L, wherein K1Is a first parameter, K1The value of (b) is 0.008 to 0.012, h is the slag thickness, h is 5mm to 40mm, L is the depth of the submerged nozzle inserted into the molten steel, and L is 150mm to 500 mm.
Optionally, the insertion depth of step (3) satisfies H = (0.35+ K)1The gas bubble has enough floating time to drive the molten steel 6 near the steel strip 4 to move upwards, so that the slag accidentally adhered to the surface of the steel strip 4 due to improper continuous casting production operation is separated from the steel strip 4 and floats upwards, and the insertion depth of the gas blow gun is smaller than that of the water gap, thereby having no obvious influence on the flow field in the crystallizer.
It is particularly emphasized that the gas flow rate before insertion in step (3) is 150-180L/min to prevent the slag or molten steel 6 from blocking the gas channel in the insertion process, and the gas flow rate of 150-180L/min is introduced to generate a large-area molten steel exposed area 5 so as to rapidly discharge the slag out of the feeding area.
Preferably, the slag thickener comprises the following chemical components in percentage by weight: CaO: 62.3 to 73.5 percent of Na2SiO3·9H2O: 5.8 to 8.2 percent.
Specifically, the slag thickener in step (4) comprises the following chemical components (wt.%): CaO: 62.3 to 73.5 percent of Na2SiO3·9H2O: 5.8-8.2%, and the balance of SiO2And inevitable impurities.
Optionally, the slag thickener chemical composition (wt.%) in step (4) may further be: CaO: 65.2-68.3% of Na2SiO3·9H2O: 6.2-6.8 percent of SiO for the rest2And inevitable impurities.
Preferably, the method further comprises the following steps:
before the slag thickener is used, uniformly mixing the slag thickener to prepare particles with the diameter of 2mm to 4 mm;
the granules are uniformly added to the feeding zone so that the slag in the feeding zone is thickened to form a layer of viscous protective slag ring (slag ring 8) with the ring width of 30mm to 50 mm.
Preferably, said feeding of the steel strip into the feeding zone comprises:
a vibrating steel belt 4 is fed into the crystallizer.
Alternatively, step (5) may also feed the oscillating steel strip 4 into the crystallizer, and the oscillation parameters of the oscillating steel strip 4 are not limited herein and may be determined according to production experience in the field.
Preferably, the method further comprises the following steps:
when the molten steel 6 contains nitrogen, introducing nitrogen into the air blowing gun 3;
when the molten steel 6 contains no nitrogen, argon gas is introduced into the gas gun 3.
Furthermore, the whole process is carried out in the protective atmosphere of nitrogen or argon, so that the secondary oxidation of the molten steel 6 is avoided; when the molten steel 6 contains nitrogen, the gas in the gas blowing gun 3 and the protective atmosphere gas are nitrogen; when the molten steel 6 contains no nitrogen, the gas in the gas blowing gun 3 and the protective atmosphere gas are argon.
The following describes an example of feeding a steel strip into a crystallizer by means of the method according to the invention:
in the embodiment, furnace molten steel is smelted together and continuous casting production is carried out, wherein in the embodiment of the invention, the slag avoiding method for improving the cleanliness of the casting blank is adopted for continuous casting steel strip feeding production; fourthly, according to the comparison scheme, the molten steel 6 is divided into a feeding zone and a non-feeding zone by adopting a protective sleeve made of refractory materials, the protective slag in the feeding zone is removed, nitrogen protective atmosphere is introduced, and the steel belt 4 is fed into the feeding zone; fifthly, directly feeding the steel strip 4 into the crystallizer without adopting a slag avoiding method according to the comparison scheme.
(1) And confirming the quantity and the position distribution of the air blowing guns according to the size of the steel strip 4. And confirming the quantity and the position distribution of the air blowing guns of the embodiment according to the width (w) of the steel strip. The air blow guns 3 are arranged in two rows in parallel, the air blow guns 3 in each row are arranged in a straight line at equal distance, and the symmetrical surfaces of one row of air blow guns 3 and the other row of air blow guns 3 are parallel to the wide surface 4 of the steel strip; the number n of the air guns in one row is more than or equal to w/60, the air guns are numbered as 1# air gun, 2# air gun and 3# air gun … … n # air gun in sequence, when n is more than or equal to 2, the distance between the adjacent air guns is x = 40-67 mm, the distance between the 1# air gun and the n # air gun is controlled to be = w +/-20 mm, the vertical distance a = 10-30 mm between the air gun heads and the steel belt 4 is controlled, and the air guns in the other row are the same as the air guns. Comparing the continuous casting process parameters and steel strip feeding process parameters of the implementation schemes and the fourth to fifth schemes as follows:
the superheat degree of the embodiment is 28 ℃, and the cross section size of the continuous casting billet is 200 multiplied by 1600mm2The width of the steel strip is 55mm, the insertion depth of the water gap is 298mm, and the thickness of the slag is 9 mm.
The superheat degree of the embodiment is 25 ℃, and the cross section size of the continuous casting billet is 200 multiplied by 1600mm2The width of the steel strip is 90mm, the insertion depth of the water gap is 305mm, and the thickness of the slag is 16 mm.
Third, the superheat degree of the embodiment is 27 ℃, and the cross section size of the continuous casting billet is 200 multiplied by 1600mm2The width of the steel strip is 156mm, the insertion depth of the nozzle is 296mm, and the thickness of the slag is 28 mm.
The superheat degree of the comparison scheme is 27 ℃, and the cross section size of the continuous casting billet is 200 multiplied by 1600mm2The width of the steel strip is 90mm, the insertion depth of the water gap is 303mm, and the thickness of the slag is 18 mm.
The superheat degree of the comparison scheme is 26 ℃, and the cross section size of the continuous casting billet is 200 multiplied by 1600mm2The width of the steel strip is 90mm, the insertion depth of the water gap is 295mm, and the thickness of the slag is 15 mm.
Distribution parameters of the number and the positions of the air blowing guns of the embodiment are shown in the table 1, and the table 1 is an air blowing process parameter indication table.
TABLE 1 blowing Process parameter schematic table
| Process parameters | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments |
| |
① | ② | ③ |
| Number of single row of |
1 | 2 | 3 |
| Total number of air blowing guns (root) | 2 | 4 | 6 |
| Gun head gas channel diameter (mm) | 2.9 | 3.4 | 4.2 |
| Air blow gun spacing (mm) | - | 45 | 47 |
| Distance (mm) between No. 1 air blow gun and No. n air blow gun | - | 100 | 163 |
| Width of feeding belt zone (mm) | - | 100 | 163 |
| Length of feeding belt zone (mm) | 155 | 190 | 256 |
| Amount of slag modifier added (g) | 89 | 113 | 139 |
| Gas component | Nitrogen gas | Nitrogen gas | Nitrogen gas |
| Gas flow before insertion (L/min) | 153 | 166 | 175 |
| Included angle between air blow gun and horizontal plane of molten steel (degree) | 75 | 72 | 78 |
| Distance (mm) between air blow gun head and wide surface of steel strip | 16 | 21 | 27 |
| K1 | 0.01 | 0.009 | 0.011 |
| K2 | 0.125 | 0.137 | 0.131 |
| K3 | 0.65 | 0.62 | 0.67 |
| Depth of insertion of air blow gun (mm) | 132 | 148 | 197 |
| Inserted gas flow (L/min) | 38.7 | 46.6 | 64.8 |
| Slag thickener addition amount (g) | 22 | 31 | 39 |
| Vibration frequency (Hz) | - | 3352 | - |
| Amplitude of vibration (mm) | - | 0.53 | - |
(2) A slag modifier is added to the feeding zone. After the continuous casting covering slag is melted, uniformly adding 80-150 g of a slag modifier into a feeding belt area of the embodiment, so that the covering slag in the feeding belt area is gathered and has good fluidity; the length of the feeding belt region = the width of the steel belt +100mm, and the width = 100-120 mm. The addition amount of the slag modifier and the size of a feeding zone of the embodiment are shown in table 1, the components of the slag modifier are shown in table 2, and table 2 is a schematic representation of the components of the slag modifier.
TABLE 2 slag modifier composition schematic table
| Ingredient (wt.%) | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments |
| |
① | ② | ③ |
| SiO2 | 43 | 39 | 47 |
| CaO | 24 | 27 | 19 |
| Na2O | 13.8 | 14.2 | 14.9 |
| K2O | 3.6 | 4.4 | 4.2 |
| Li2O | 2.1 | 1.8 | 1.6 |
| MnO | 3.2 | 3.5 | 3.9 |
| Al2O3 | 2.3 | 1.2 | 2.7 |
| MgO | 1.5 | 2.1 | 1.5 |
| Fe2O3 | Allowance of | Balance of | Balance of |
| Na2O/K2O | 3.8 | 3.2 | 3.5 |
(3) Gas is introduced into the gas blow gun and the gas blow gun is inserted into the molten steel 6. And (4) introducing nitrogen into the air blowing guns of the embodiments of the first to the third, and controlling the flow of the air before the gun heads are inserted to be 150 to 180L/min. Adjusting the direction of the air blow gun, controlling the horizontal included angle between the air blow gun and the molten steel surface to be 70-80 degrees, inserting the air blow gun into the molten steel 6, wherein the insertion depth of the air blow gun is H = (0.35+ K)1×h)×L（mm），K1And h is the thickness of the slag, and L is the insertion depth of the submerged nozzle. Bubbles are generated through blowing, the molten steel 6 is driven to flow upwards through the upward floating of the bubbles, the molten steel 6 rolls on the surface of a molten pool, and slag is discharged out of a feeding zone, so that the molten steel 6 in the feeding zone of the embodiment I to III is exposed. Blowing process parameters of the embodiments are shown in table 1.
(4) Slag thickener was added to the feeding zone and gas flow was adjusted. After the air blow gun is inserted into molten steel for 40-60 s, after the exposed area of the molten steel in the feeding zone is stable, 20-40 g of slag thickening agent is added into the slag at the edge of the feeding zone, the viscosity of the surrounding slag is further increased, a high-viscosity protective slag ring (slag ring 8) is formed, the slag in the feeding zone is adsorbed, and the slag outside the feeding zone is prevented from entering the feeding zone. The flow of the air blow gun is adjusted to ensure that the flow Q =40-K of the inserted body2×H0.92+K3×h1.24（L/min），K2=0.12~0.14，K3And = 0.6-0.7. Blowing parameters are shown in table 1, slag thickener components of embodiments (i) - (iii) are shown in table 3, and table 3 is a slag thickener component indication table.
TABLE 3 slag thickener composition schematic table
| Ingredient (wt.%) | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments |
| |
① | ② | ③ |
| CaO | 64 | 67 | 71 |
| SiO2 | 21 | 19 | 16 |
| Na2SiO3·9H2O | 6.3 | 7.1 | 7.9 |
| Na2O | Balance of | Balance of | Balance of |
(5) And (4) starting the belt feeding device, and feeding the steel belt 4 into the belt feeding region of the embodiment (i) to (iii). Wherein vibration was applied to the steel strip 4 of the embodiment (II), and the parameters are shown in Table 1. And feeding the steel belt 4 into the belt feeding area of the comparison scheme. Directly feeding a steel strip 4 into the crystallizer of the comparison scheme.
The continuous casting feeding belt production of the embodiment is smooth, the molten steel 6 in the feeding belt area has good fluidity, and the slag inclusion phenomenon of the steel belt is not observed. And fourthly, after the comparative scheme is implemented for a period of time, the molten steel 6 in the protective sleeve is found to be solidified, and the continuous casting production is interrupted. Comparative analysis as described in the subsequent examples was not performed due to the interruption of continuous casting production in the comparative scheme. In the comparison scheme, the molten slag is brought into the crystallizer by the steel strip 4, and the obvious phenomenon of steel strip slag inclusion is observed. The method for avoiding the slag of the invention can effectively avoid slag inclusion caused by contact between the steel strip and the slag, and compared with the method adopting a protective sleeve or devices with similar functions, the method for avoiding the slag can avoid the risk of solidification of molten steel in the protective sleeve or devices with similar functions and the like, thereby ensuring smooth continuous casting production.
The following describes an embodiment of statistical analysis of the exposed size of molten steel by using the method of the invention:
the width, length and area of the molten steel exposed area 5 in the crystallizer are counted, and the statistical result is shown in FIG. 4. It can be seen that in the embodiments of the first to the third, the width of the molten steel exposed area 5 is larger than 50mm, and the length of the molten steel exposed area 5 is larger than the width of the corresponding steel strip, so that the steel strip 4 can be ensured to be far away from the molten slag, and the slag inclusion problem is avoided. Meanwhile, the error area, the fluctuation of the area of the molten steel exposed area 5 is less than 10%, and the area is stable. And fifthly, in the comparison scheme, no obvious molten steel exposed area 5 exists. The method for avoiding the slag to improve the purity of the casting blank ensures that the width, the length and the area of the molten steel bare zone 5 are stable, can effectively avoid the slag inclusion problem caused by the steel strip 4 penetrating through a slag layer, and improves the purity of the casting blank.
The following describes an embodiment of counting foreign matters such as large-size inclusions, slag inclusions and the like by using the method of the invention:
and (4) detecting the cross sections of the continuous casting billets from (i) - (iii) and (v), and counting the number of large-size foreign matters, wherein the counting results are shown in table 4, and the table 4 is a significance table of the counting results of the number of the large-size foreign matters of the continuous casting billets from (i) - (iii) and (v). And thirdly, no large foreign matter is found on the cross section of the continuous casting billet. Finding 15 large-size foreign matters with the diameter larger than 1mm in the cross section of the continuous casting billet, and analyzing the components by using a scanning electron microscope, wherein the result shows that the components of the large-size foreign matters are similar to those of the continuous casting covering slag, and the large-size foreign matters in the continuous casting billet come from molten slag. The comparison shows that the slag avoiding method for improving the purity of the casting blank can effectively avoid the problem of slag inclusion of the steel strip, eliminate large-size foreign matters generated by slag inclusion in the casting blank and improve the purity of the casting blank.
TABLE 4 summary of statistical results of the large-size inclusions in the casting blanks
| Detailed description of the preferred embodiments | Detailed description of the preferred embodiments | Detailed description of the preferred embodiments | Comparison scheme | |
| |
① | ② | ③ | ⑤ |
| Number of inclusions not less than |
0 | 0 | 0 | 15 |
The following describes an example of the statistics of small-sized inclusions using the method of the present invention:
counting the diameters and the number of the inclusions of the (i) - (iii) continuous casting billets and the (v) continuous casting billets, wherein the result is shown in fig. 5. (iii) average diameter of inclusions in embodiments<3.5 μm and the number density amount of inclusions<35 pieces/mm2(ii) a And fifth, average diameter of inclusions in comparative example>6.0 μm, inclusion density>60 pieces/mm2The method is far greater than the implementation schemes. The slag avoiding method for improving the purity of the casting blank can effectively avoid the problem of slag inclusion of the steel strip, so that the inclusion in the casting blank is small in size and small in quantity, and the purity of the casting blank is improved.
The technical principle of the invention is as follows:
(1) according to the invention, the gas blowing gun is used for continuously blowing gas into the crystallizer molten steel 6 to generate bubbles, the bubbles float upwards to drive the molten steel 6 to move upwards, so that the molten steel 6 rolls on the surface of a molten pool and forms a molten steel exposed area 5, and the molten slag is discharged out of a feeding area, so that a steel strip 4 is prevented from contacting the molten slag from the source;
(2) according to the invention, the diameter, the insertion depth and the gas flow of the gas channel of the gun head of the gas blow gun are reasonably controlled according to the thickness of the molten slag layer and the depth of the immersion type water gap 7 inserted into the molten steel, so that the exposed area of the molten steel is stable; the diameter of a gun head gas channel of the gas blowing gun is 2.5-4.5 mm, so that bubbles can be ensured to float vertically in the molten steel 6, obvious deviation along with the flow of the molten steel 6 is avoided, and good continuity of the bubbles is ensured; the insertion depth satisfies H = (0.35+ K)1The multiplied by h) multiplied by L (mm) can ensure that bubbles have sufficient floating time to drive the molten steel 6 near the steel strip 4 to move upwards, and when the continuous casting production operation is not performed and the slag is accidentally adhered to the surface of the steel strip 4, the molten steel 6 moving upwards can wash the steel strip 4, separate the adhered slag from the steel strip 4, and float upwards along with the flowing until the surface is slowly adsorbed by the slag; the gas flow rate satisfies Q =40-K2×H0.92+K3×h1.24（L/min）The molten steel exposed area 5 with the width of 30-70 mm can be generated under different insertion depths of the air blow gun and the thickness of the slag layer, and the area is stable.
(3) According to the invention, the slag modifier and the thickening agent are added around the feeding zone to form a slag ring with a stable area, so that the area of the molten steel exposed zone 5 is further stabilized. The slag modifier satisfies Na2O/K2O = 3-4, which can make the modifier fully expand 10-15 times and adsorb liquid slag; the modifier contains 1.6-2.3% of Li2O and 3.2-4.2% MnO can ensure that the viscosity of the modified slag is 0.4-0.7 Pa.s, and the modified slag has stronger slag adsorption capacity and better fluidity. The slag thickener contains 62-73% of CaO, so that the viscosity of the slag is increased to 1.2-1.5 Pa.s, and the slag has low fluidity and strong slag adsorption capacity. By the means, the slag inclusion problem in the steel strip feeding process of the crystallizer can be effectively avoided, and the purity of the casting blank is improved.
The invention has the following beneficial effects:
(1) the slag avoiding method for improving the purity of the casting blank can effectively avoid the slag adhesion phenomenon caused by the contact of the steel belt and the slag, and compared with methods such as a protective sleeve, a slag discharging device or a protective device, the slag avoiding method has the advantages that the molten steel fluidity of the feeding zone is good, the risk of the solidification of the molten steel in the protective sleeve or the device with similar functions can be effectively avoided, and the smooth continuous casting production is ensured.
(2) The invention reasonably controls the diameter, the insertion depth and the gas flow of the gas channel of the gun head of the gas gun according to the thickness of the molten slag layer, and can ensure that the area of the exposed area of the molten steel is stable and the fluctuation of the area of the exposed area of the molten steel is less than 10 percent.
(3) According to the invention, the gas is continuously blown into the molten steel by the gas blowing gun, the molten steel is driven to move upwards by the rising bubbles, the molten steel rolls and exposes on the surface of the molten pool, and the molten slag is discharged out of the feeding zone, so that the slag inclusion problem caused by the contact of a steel strip and the molten slag is avoided from the source, and foreign matters such as large-size inclusion, slag inclusion and the like with the internal size of more than or equal to 1mm in a casting blank disappear.
(4) The invention reasonably controls the insertion depth and the position of the gun head of the air blow gun, can ensure that bubbles generated by the air blow gun have sufficient floating time, drives molten steel near a steel strip to move upwards, promotes impurities to float upwards, and ensures that the average diameter of the impurities in a casting blank is less than 3.5 mu m.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A slag avoiding method for improving purity of a casting blank is characterized by comprising the following steps:
determining the number of air blowing guns and the position distribution of the air blowing guns according to the width of the steel strip, and arranging the air blowing guns according to the number and the position distribution;
adding a slag modifier into a feeding zone to enable the covering slag in the feeding zone to be gathered and have fluidity;
introducing gas into the gas blow gun and inserting the gas blow gun into the molten steel so as to discharge the molten slag out of the feeding zone and expose the molten steel in the feeding zone;
adding slag thickener to the edge of the feeding zone and adjusting the flow of the gas;
and starting the feeding belt device, and feeding the steel belt into the feeding belt region.
2. The slag avoiding method for improving the purity of a casting blank according to claim 1, wherein the arranging the air blowing guns according to the number and the position distribution comprises:
arranging the air blowing guns in two rows in parallel, wherein the air blowing guns in each row are arranged in a straight line at equal intervals, and the symmetrical surfaces of one row of air blowing guns and the other row of air blowing guns are parallel to the wide surface of the steel strip; the number of the air blowing guns in any row is not less than w/60, wherein w is the width of the steel strip, and the unit of w is mm;
and when the number of the air blow guns is more than 1, controlling the distance between the adjacent air blow guns to be 40mm to 67mm, controlling the distance between the first air blow gun and the last air blow gun in any row to be w-20mm to w +20mm, and controlling the vertical distance between the gun heads of the air blow guns and the steel strip to be 10mm to 30 mm.
3. The slag avoiding method for improving the purity of the casting blank according to claim 1, wherein a gun head of the air blowing gun is made of a refractory material, and a gas channel of the gun head has a diameter of 2.5mm to 4.5 mm.
4. The slag avoiding method for improving the purity of the casting blank according to claim 1, wherein the mass of the slag modifier is 80 to 150 g; the length of the feeding belt area is w +100mm, w is the width of the steel belt, and the width of the feeding belt area is 100mm to 120 mm.
5. The slag avoiding method for improving the purity of the casting blank according to claim 1, wherein the weight percentage of the chemical components of the slag modifier is as follows: SiO 22: 38.2 to 52.5%, CaO: 18.3 to 32.1 percent of Na2O: 13.5% to 15.7%, K2O: 3.3% to 4.5%, Li2O: 1.6% to 2.3%, MnO: 3.2 to 4.2% of Al2O3Not more than 3.0 percent, and not more than 3.0 percent of MgO; na (Na)2Weight percent of O and K2The ratio of the weight percent of O is 3 to 4.
6. The method for avoiding slag for improving the purity of a casting blank according to claim 1, wherein the step of introducing gas into the gas gun and inserting the gas gun into the molten steel comprises the following steps:
before the air blow gun is inserted into the molten steel, introducing nitrogen or argon into the air blow gun, and controlling the flow rate of air before the gun head of each air blow gun is inserted to be 150L/min-180L/min;
adjusting the direction of the air blow gun, controlling the horizontal included angle between the air blow gun and the liquid level of the molten steel to be 70-80 degrees, inserting the air blow gun into the molten steel of the feeding zone, and controlling the depth of the air blow gun inserted into the molten steel to be (0.35+ K)1X h) x L, wherein K1Is a first parameter, K1The value of (a) is 0.008 to 0.012, h is the slag thickness, h is 5mm to 40mm, L is the depth of the immersion nozzle inserted into the molten steel, and L is 150mm to 500 mm.
7. The slag avoiding method for improving the purity of the casting blank according to claim 1, wherein the slag thickener comprises the following chemical components in percentage by weight: CaO: 62.3 to 73.5 percent of Na2SiO3·9H2O: 5.8 to 8.2 percent.
8. The slag avoiding method for improving the purity of a casting blank according to claim 1, further comprising:
before the slag thickener is used, uniformly mixing the slag thickener to prepare particles with the diameter of 2mm to 4 mm;
uniformly adding the particles to the feeding zone so as to thicken the slag in the feeding zone to form a layer of viscous protective slag ring with the ring width of 30-50 mm.
9. The method for avoiding slag to improve the purity of a casting blank according to claim 1, wherein the step of feeding a steel strip into the strip feeding zone comprises the following steps:
a vibrating steel strip is fed into the crystallizer.
10. The slag avoiding method for improving the purity of a casting blank according to claim 1, further comprising:
when the molten steel contains nitrogen, introducing nitrogen into the air blowing gun;
when the molten steel contains no nitrogen, argon is introduced into the air blowing gun.
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