CN111215615A - Continuous casting tundish capable of improving purity of molten steel and metallurgical process thereof - Google Patents
Continuous casting tundish capable of improving purity of molten steel and metallurgical process thereof Download PDFInfo
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- CN111215615A CN111215615A CN202010143484.0A CN202010143484A CN111215615A CN 111215615 A CN111215615 A CN 111215615A CN 202010143484 A CN202010143484 A CN 202010143484A CN 111215615 A CN111215615 A CN 111215615A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 148
- 239000010959 steel Substances 0.000 title claims abstract description 148
- 238000009749 continuous casting Methods 0.000 title claims abstract description 64
- 238000010310 metallurgical process Methods 0.000 title claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 37
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000010935 stainless steel Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000005672 electromagnetic field Effects 0.000 abstract description 4
- 238000007667 floating Methods 0.000 abstract description 3
- 238000004220 aggregation Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
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- 230000006698 induction Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004401 flow injection analysis Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
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- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000000265 homogenisation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
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Classifications
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a continuous casting tundish capable of improving the purity of molten steel and a metallurgical process thereof, and relates to a tundish, wherein a slag wall is arranged to be arc-shaped mainly by changing the structure in the tundish, a specific area of the tundish wall is welded by nonmagnetic stainless steel, and molten steel in the tundish is transversely stirred by the electromagnetic force of an external electromagnetic field, so that the flow field of the tundish is improved in the tundish, the transverse flow of the molten steel and inclusions in the continuous casting tundish is enhanced, the temperature is uniform, dead zones of the molten steel are removed, the transverse collision and aggregation of the inclusions in the molten steel are promoted, the inclusions are removed in a floating manner, the temperature of the molten steel is uniform, the inclusions are removed, and the purity of special molten steel is improved.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a continuous casting tundish capable of improving the purity of molten steel and a metallurgical process thereof, and specifically relates to a continuous casting tundish capable of controlling the uniformity of components and the temperature uniformity of the molten steel and improving the purity of the molten steel and a metallurgical process thereof.
Background
A continuous casting tundish is a refractory container used in steel making, and firstly receives molten steel poured from a ladle and then distributes the molten steel to each crystallizer through a tundish nozzle. The tundish is an intermediate link of a steelmaking production flow and is a joint point which is changed from intermittent operation to continuous operation. The tundish as a metallurgical reactor is an important ring for improving the yield and quality of special steel.
It is believed that the continuous casting tundish plays roles of shunting, continuous casting, decompressing, protecting and removing impurities. In general steel production enterprises, continuous casting tundishes are mainly required to play a role in shunting, continuous casting and pressure reduction, but special steel production enterprises pay more attention to the protection and impurity removal effects of the tundishes, so that the maximum metallurgical effect of the tundishes is exerted as much as possible, the molten steel is protected and impurity removal effects are realized, the molten steel in the tundishes is reduced from external pollution through a covering agent, a long nozzle and other protection devices on the liquid level of the tundishes, the flowing condition of the molten steel is improved, and particles of non-metallic inclusions in the steel are removed as much as possible when the particles are in a liquid state. Namely, short-circuit flow is prevented, dead zones are reduced, the streamline direction is improved, and the residence time of molten steel is increased. The temperature of the molten steel is controlled well, so that the superheat degree of the molten steel is kept stable. The proper lining refractory material and the proper molten pool covering agent are selected, so that the heat loss is reduced, and the separated and floated inclusion is absorbed.
Chinese patent No. CN104959585A discloses a tundish for billet caster and its installation method, chinese patent No. CN209754003U discloses a tundish for continuous casting, chinese patent No. CN201572906U discloses a dam weir of the inner cavity of the continuous casting tundish, chinese patent No. CN207547616U discloses the tundish of the continuous casting caster, and the conventional continuous casting tundish of the conventional continuous casting tundish at present is provided with a slag weir and a flow guiding dam. The slag dam (also called slag wall in the technical field) spans the width of the whole tundish and extends from the upper part of the molten steel surface to a certain distance from the bottom of the tundish, and the molten steel can flow through the lower part of the slag dam. The size of the ladle flow injection impact area can be controlled, the stirring strength of the ladle flow injection to the molten steel in the middle ladle is controlled, and collision and bonding of inclusions to large particles are promoted to a certain extent to float upwards and be removed. The diversion dam stretches across the width of the whole tundish, extends upwards from the bottom of the tundish to a certain distance below the molten steel surface, and the molten steel flows over the diversion dam, so that the flowing distance of the molten steel in the tundish is prolonged, the retention time of the molten steel in the tundish is prolonged, and floating removal of inclusions and capturing of inclusions by top slag are facilitated.
However, the traditional continuous casting tundish with the diversion dam is provided with the diversion dam, molten steel on the upper portion of the diversion dam can flow sufficiently due to the arrangement of the diversion dam, a dead zone can be formed on the molten steel on the lower portion of the diversion dam, particularly, the molten steel is far away from a ladle long nozzle casting area, the flowing is more obvious, the temperature of the molten steel at the position is not uniform enough, inclusions in the molten steel are not collided and bonded into large particles to float upwards to be removed, the diversion dam can pollute the molten steel to a certain extent, and secondary pollution to the molten steel can be reduced only by reducing continuous casting furnace water during casting of special steel, so that the production cost is greatly improved.
Chinese patent No. CN201249260 discloses a vertical bending type slag blocking wall for a continuous casting tundish, which consists of a plane wall body and inclined plane wall bodies arranged at two sides of the plane wall body, wherein the inclined plane wall bodies respectively form an angle a with the plane wall body, the angle a is 100-170 degrees, and steel flowing holes are respectively arranged on the inclined plane wall bodies at the two sides. Because the slag wall is a vertical bending type slag wall and an arc slag wall which are greatly different, molten steel is mainly contacted with the slag wall in the pouring process, molten steel can form a certain dead zone at the vertical bent corner part, the flowability is poor, and the molten steel can form vortex in the pouring process, so that the molten steel erosion of the vertical bending type slag wall is uneven, particularly the position close to the corner part can cause abnormal erosion, refractory materials enter the molten steel, and the molten steel is secondarily polluted.
Chinese patent No. CN208099326U discloses a continuous casting tundish, which comprises a tundish shell, a slag wall is arranged in the tundish shell, the slag wall separates the inner cavity of the tundish shell into an impact area and a pouring area, and a tundish water outlet is arranged at the bottom of the pouring area of the tundish shell. Although the continuous casting tundish is not provided with the guide dam, the tundish body structure, the number of the crystallizer nozzles and the shape of the slag wall are different from those of the tundish, especially the shape of the slag wall and the arrangement of the guide holes, so that the difference of a molten steel flow field in the tundish is inevitably caused, a molten steel dead zone is generated in the tundish, and the effect of removing inclusions in the molten steel in the tundish is influenced.
Chinese patent CN201910418150 discloses a tundish with induction heating and electromagnetic stirring, which has undesirable flow field distribution in the tundish due to the installation and installation positions of the induction heating and electromagnetic stirring, and cannot form a large-range flow field, and molten steel can only flow in a small range, and still form a molten steel dead zone, and induction heating can cause the temperature difference of the molten steel in the tundish to be larger, especially the molten steel at the dead zone position to be lower, and the production cost of the tundish is greatly increased.
Therefore, the existing continuous casting tundish cannot meet the quality and production requirements of high-quality special steel products with high purity, high homogenization and stability.
Disclosure of Invention
In order to overcome the problems of the prior art, the invention aims to provide a continuous casting tundish and a metallurgical process thereof, which can improve the purity of molten steel, can control the uniformity of special steel components and the temperature uniformity, can improve the purity of the molten steel, the number of special steel continuous casting furnaces can be increased, the production cost is reduced, the slag blocking wall is arranged to be arc-shaped mainly by changing the internal structure of the tundish, the special molten steel is welded by nonmagnetic stainless steel in a specific area of the tundish wall, and molten steel in the tundish is transversely stirred by electromagnetic force of an external electromagnetic field, so that the flow field of the tundish in the tundish is improved, the transverse flow of the molten steel and inclusions in the continuous casting tundish is enhanced, the temperature is uniform, the dead zone of the molten steel is removed, the inclusions in the molten steel are promoted to transversely collide and gather, float upwards and be removed, the temperature of the molten steel is uniform, the inclusions are removed, and the purity of the special molten steel is improved.
The purpose of the invention is realized by the following technical scheme:
a continuous casting tundish capable of improving the purity of molten steel comprises a ladle body and a slag wall arranged in the ladle body and used for dividing an inner cavity of the ladle body into an impact area and a pouring area, wherein the impact area is positioned on the rear side of the left end of the inner cavity of the ladle body and is provided with a ladle long nozzle;
the outer layer of the bag wall of the bag body is a steel plate layer (which can be a low-carbon heat-resistant steel plate), the bag wall of the bag body positioned at the front side of the pouring area is welded with a nonmagnetic stainless steel plate, an electromagnetic stirrer is installed on the nonmagnetic stainless steel plate, and the bottom wall of the bag body positioned in the pouring area is provided with a crystallizer water gap; the top of the slag blocking wall is flush with the upper edge of the bag body, 2-4 steel flow holes are formed in the middle lower portion of the slag blocking wall, and the steel flow holes are used for communicating the impact area and the pouring area.
Further, the steel flowing holes are uniformly and alternately arranged along the horizontal direction.
Furthermore, the non-magnetic stainless steel plate is welded with a low-carbon heat-resistant steel plate by adopting a special stainless steel welding rod. The stainless steel plate area is beneficial to penetration of an electromagnetic field, and the molten steel is fully and transversely stirred.
Furthermore, the number of the crystallizer water gaps is 3-6, and the crystallizer water gaps are uniformly arranged at intervals along the linear direction.
Further, the bag wall of the bag body comprises the steel plate layer, the heat insulation layer, the permanent layer and the working layer which are sequentially arranged from outside to inside; the working layer is made of a magnesium dry-type material resistant material. Furthermore, the thickness of the working layer on the bottom wall of the ladle body right below the long nozzle of the ladle is 50-80mm, so that the ladle body has high temperature resistance and molten steel impact resistance, the thickness of the dry material resistant material on the rest periphery and the bottom working layer of the ladle body is 30-50mm, and the dry material resistant material is flushed by high temperature and electromagnetic force.
A metallurgical process comprising the steps of: KR furnace desulfurization → converter steelmaking → LF refining furnace deoxidation and alloying → RH furnace vacuum refining → continuous casting tundish purification → continuous casting pouring → rolling, the continuous casting tundish purification step is carried out by adopting the continuous casting tundish capable of improving the purity of molten steel.
Specifically, the purification method of the continuous casting tundish comprises the following steps: baking the continuous casting tundish for 3 +/-0.5 hours, sealing a long nozzle of the ladle by using argon, casting under the protection of argon in the whole process, and controlling the current of an electromagnetic stirrer to be 400 +/-100A when molten steel is poured.
Compared with the prior art, the invention has the following technical effects:
1. based on the continuous casting tundish, the arc slag wall (preferably the arc slag wall) is arranged at the edge of the impact area of the long nozzle of the ladle, the traditional diversion dam is omitted, the internal flow field of the continuous casting tundish is optimized, the dead zone of molten steel can be reduced, the local erosion degree of the slag wall is reduced, and the slag wall can be guaranteed to be evenly eroded in the service life. The method is used for homogenizing the temperature of the molten steel, the components of the molten steel and inclusions, colliding and floating, and can better improve the purity of the molten steel.
2. And meanwhile, the molten steel which is far away from the casting position of the long nozzle of the steel ladle is transversely stirred by adopting the synergistic effect of external electromagnetic stirring equipment and the arc-shaped slag wall, so that the molten steel is fully stirred under the action of transverse electromagnetic force and impact force in the vertical direction, and dead zones are avoided. In addition, a larger flow field and molten steel circulation can be formed in the tundish, the residence time of the molten steel in the tundish is delayed, the molten steel is more utilized for homogenizing the temperature of the molten steel, transverse collision and aggregation of inclusions in the molten steel are promoted, and then the inclusions are floated and removed, so that the temperature of the molten steel is homogenized, the inclusions are removed, and the purity of the special molten steel is improved.
3. The high-quality special steel is produced based on the metallurgical process of the continuous casting tundish, the temperature difference of each point in the tundish is less than or equal to 3.0 ℃, and the [ O ] in the high-carbon high-aluminum special steel tundish molten steel](oxygen content) is controlled below 4ppm, [ O ] in the molten steel of the low-carbon high-aluminum special steel tundish]The continuous casting furnace number of the high-quality special steel is controlled to be below 15ppm and reaches more than 10 furnaces. The special steel rolling material product has no coarse inclusion, the sum of fine inclusions A + B + C + D is less than or equal to 2.0, and Ds is less than or equal to 0.5 grade, wherein the average oxygen content of the bearing steel product is less than or equal to 5.5ppm, and the titanium content is less than or equal to 12 ppm; the steel product of the bearing steel has the reticular carbide not more than 1.5 grade, the carbide liquation 0 grade and the carbide size not more than 2 mu m; the rated life of the bearing steel product reaches L10-107And (4) stages.
Drawings
FIG. 1 is a schematic structural view (front view) of a tundish in an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural view (in a top view) of a bag cover according to an embodiment of the present invention;
FIG. 4 is a schematic view of the distribution of the flow field of molten steel in the tundish body in the embodiment of the invention.
FIG. 5 is a three-view drawing of a slag wall according to an embodiment of the present invention, wherein a is a left view, b is a front view, and c is a top view.
The reference numbers are as follows: 1. the ladle comprises a ladle body, 2, a slag blocking wall, 3, a ladle long nozzle, 4, a stainless steel plate, 5, an electromagnetic stirrer, 6, a crystallizer nozzle, 7, a steel flowing hole, 8, a stopper rod hole and 9, an installation opening.
Detailed Description
The invention is described in more detail below with reference to the following examples:
the present invention is not limited to the following embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1 to 5, solid arrows in the drawings represent the flowing direction of molten steel, hollow arrows represent the moving direction of a magnetic field, and the continuous casting tundish capable of improving the purity of the molten steel comprises a ladle body 1 and a slag wall 2 which is arranged in the ladle body 1 and divides the inner cavity of the ladle body 1 into an impact area and a pouring area, wherein the impact area is positioned on the rear side of the left end of the inner cavity of the ladle body 1, and the impact area is provided with a ladle long nozzle 3.
The outer layer of the bag wall of the bag body 1 is a steel plate layer, a nonmagnetic stainless steel plate is welded in the bag wall of the front side of the bag body 1 in the pouring area, an electromagnetic stirrer 5(EMS) is installed on the nonmagnetic stainless steel plate, and a crystallizer water gap 6 is formed in the bottom wall of the bag body 1 in the pouring area. The top of the slag-stopping wall 2 is flush with the upper edge of the ladle body 1, 2-4 steel flow holes 7 are formed in the middle lower part of the slag-stopping wall 2, and the steel flow holes 7 are used for communicating the impact area and the pouring area.
The bag wall of the bag body 1 comprises a steel plate layer, a heat insulation layer, a permanent layer and a working layer which are sequentially arranged from outside to inside, and specifically, the tundish body 1 is made of steel plates and section steel, and is internally filled with a lining and heat insulation materials. The material of the heat-insulating layer and the permanent layer of the ladle body 1 is the same as that of a common continuous casting tundish, the innermost side and the bottom of the working layer which is directly contacted with molten steel adopt dry refractory materials, the thickness of the working layer at the bottom of a casting area right below a long nozzle 3 of a steel ladle is 50-80mm, the impact of the molten steel is resisted, the thickness of the rest peripheral and bottom working layers is 30-50mm, the dry refractory materials resist high temperature and electromagnetic force washing, and the main component of the dry refractory materials is magnesium.
The size of the nonmagnetic stainless steel plate is 1.0m by 2.0m, and the stainless steel plate and the steel plate layer (the material of the steel plate layer in the embodiment is a low-carbon heat-resistant steel plate) are welded by adopting a special stainless steel welding rod. The nonmagnetic stainless steel plate area is beneficial to penetration of an electromagnetic field, and the molten steel is fully and transversely stirred.
The arc slag wall 2 can reduce the molten steel blind area, reduces the local erosion degree of the slag wall 2, ensures that the slag wall 2 can be evenly eroded in the service life, the upper part of the slag wall 2 is flush with the upper edge of the middle ladle, the lower part of the slag wall 2 is provided with 3 steel flowing holes 7, the steel flowing holes 7 are evenly arranged along the horizontal direction at intervals, and the aperture of the steel flowing hole 7 in the embodiment is phi 50 mm. The number of the crystallizer water gaps 6 is 4, the crystallizer water gaps are uniformly arranged at intervals along the linear direction, and a continuous casting tundish installation gap is coated by dry-type refractory materials.
The ladle cover is made of steel plates and section steel, the lower part of the ladle cover is filled with heat-insulating materials, so that the temperature loss of molten steel is reduced, the ladle cover is provided with a mounting port 9 corresponding to a ladle long nozzle 3, a stopper rod hole 8 corresponding to a crystallizer nozzle 6 is also arranged, argon pipelines are arranged around the ladle cover and around the stopper rod hole 8, after argon is introduced, the molten steel surface of the ladle is guaranteed to keep micro-positive pressure, an argon layer can be formed on the upper surface of the molten steel, the molten steel is prevented from contacting with air, and secondary oxidation is generated.
The metallurgical process based on the continuous casting tundish of the embodiment is concretely shown in the following embodiment:
example 1:
the high-quality bearing steel product produced by the novel special steel continuous casting tundish adopts the production process as follows: 130-ton KR furnace desulfurization, 130-ton converter steelmaking, 130-ton LF refining furnace deoxidation and alloying, 130-ton RH furnace vacuum refining, novel continuous casting tundish purification, continuous casting pouring and rolling. The steel comprises 0.99% of C, 0.27% of Si, 0.31% of Mn, less than or equal to 0.008% of S, 1.47% of Cr, 0.013% of Al and 0.0021% of Ti.
Wherein the novel continuous casting tundish adopts the arc slag-stopping wall 2, the ladle cover adopts argon gas for sealing, and the tundish working layer adopts magnesium dry material for casting molding. The purification method of the continuous casting tundish comprises the following steps: the tundish is baked for 3 hours, the continuous casting long nozzle is sealed by argon, the crystallizer nozzle 6 is integrally arranged in the tundish, the whole process adopts protective casting, the electromagnetic stirring current is controlled to be 400A when molten steel is cast, the normal casting process is actually measured, the maximum temperature difference of each point in the tundish is 2 ℃, the total oxygen of the continuous casting tundish is 4.4ppm, and the total oxygen of a finished product is 4.0 ppm. The grade of the coarse inclusions of the rolled material is 0, the grade of the A-type fine inclusions of the rolled material is 0.5, the grade of the B-type fine inclusions of the rolled material is 0.5, the grade of the C-type fine inclusions of the rolled material is 0.5, the grade of the D-type fine inclusions of the rolled material is 0.5, and the grade of the Ds-type fine inclusions of the rolled material is. The sum of the fine lines A + B + C + D is 1.5 grade.
Example 2
The high-quality gear steel product produced by the novel special steel continuous casting tundish adopts the production process as follows: 130-ton KR furnace desulfurization, 130-ton converter steelmaking, 130-ton LF refining furnace deoxidation and alloying, 130-ton RH furnace vacuum refining, novel continuous casting tundish purification, continuous casting pouring and rolling. Composition C of steel: 0.19%, Si: 0.23%, Mn: 1.28%, Cr: 1.15%, Mo: 0.003%, B: 0.0001%, Cu: 0.005%, Ni: 0.005 percent.
Wherein, novel package adopts arc to keep off slag wall 2 in the middle of the continuous casting, and the ladle cover adopts argon gas sealed, and the package working layer adopts the dry-type material of magnesium to cast molding in the middle of. The purification method of the continuous casting tundish comprises the following steps: the tundish is baked for 2.5 hours, the continuous casting long nozzle is sealed by argon, the crystallizer nozzle 6 is arranged in the whole tundish, the whole process adopts protective casting, the electromagnetic stirring current is controlled to be 300A when molten steel is cast, the actual measurement is carried out in the normal casting process, the maximum temperature difference of each point in the tundish is 3 ℃, the total oxygen of the continuous casting tundish is 13.5ppm, and the total oxygen of a finished product is 12.0 ppm. The grade of the coarse inclusions of the rolled material is 0, the grade of the A-class fine inclusions of the rolled material is 1.0, the grade of the B-class fine inclusions of the rolled material is 0.5, the grade of the C-class fine 0, the grade of the D-class fine inclusions of the rolled material is 0.5, and the grade of the Ds-class 0. The sum of the fine lines A + B + C + D is 2 grade.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (6)
1. The utility model provides a can improve continuous casting pouring basket of molten steel purity which characterized in that: the ladle comprises a ladle body (1) and a slag wall (2) which is arranged in the ladle body (1) and divides an inner cavity of the ladle body (1) into an impact area and a pouring area, wherein the impact area is positioned on the rear side of the left end of the inner cavity of the ladle body (1), and the impact area is provided with a ladle long nozzle (3);
the outer layer of the bag wall of the bag body (1) is a steel plate layer, the middle part of the bag wall, positioned on the front side of the pouring area, of the bag body (1) is welded with a nonmagnetic stainless steel plate, an electromagnetic stirrer (5) is mounted on the nonmagnetic stainless steel plate, and a crystallizer water gap (6) is formed in the bottom wall, positioned on the pouring area, of the bag body (1); the top of the slag blocking wall (2) is flush with the upper edge of the bag body (1), 2-4 steel flowing holes (7) are formed in the middle lower part of the slag blocking wall (2), and the steel flowing holes (7) are used for communicating the impact area and the pouring area.
2. The continuous casting tundish capable of improving molten steel purity according to claim 1, wherein: the steel flowing holes (7) are uniformly and alternately arranged along the horizontal direction.
3. The continuous casting tundish capable of improving molten steel purity according to claim 1, wherein: the crystallizer water gaps (6) are 3-6 and are uniformly and alternately arranged along the linear direction.
4. The continuous casting tundish capable of improving molten steel purity according to claim 1, wherein: the bag wall of the bag body (1) comprises the steel plate layer, the heat insulation layer, the permanent layer and the working layer which are sequentially arranged from outside to inside; the working layer is made of a magnesium dry-type material resistant material.
5. A metallurgical process comprising the steps of: KR furnace desulfurization → converter steelmaking → LF refining furnace deoxidation and alloying → RH furnace vacuum refining → continuous casting tundish purification → continuous casting pouring → rolling, which is characterized in that: the continuous casting tundish purification step is performed by using the continuous casting tundish capable of improving the purity of molten steel according to any one of claims 1 to 4.
6. The metallurgical process of claim 5, wherein: the continuous casting tundish purification method comprises the following steps: baking the continuous casting tundish for 3 +/-0.5 hours, sealing a crystallizer nozzle (6) by adopting argon gas for the ladle long nozzle (3), casting under the protection of argon gas in the whole process, and controlling the current of the electromagnetic stirrer (5) to be 400 +/-100A when molten steel is cast.
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| CN113275529A (en) * | 2021-04-30 | 2021-08-20 | 江苏沙钢集团有限公司 | Processing method for controlling titanium oxide in titanium-containing alloy steel and tundish adopted by same |
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