CN111394656B - Crystallizer - Google Patents
Crystallizer Download PDFInfo
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- CN111394656B CN111394656B CN202010374744.5A CN202010374744A CN111394656B CN 111394656 B CN111394656 B CN 111394656B CN 202010374744 A CN202010374744 A CN 202010374744A CN 111394656 B CN111394656 B CN 111394656B
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- 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
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
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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
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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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
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a crystallizer; the hot-rolled coil comprises the following chemical components in percentage by weight: c: 0.12-0.20%; mn: 0.25 to 0.31 percent; si: 0.23-0.3%; s: 0.045%; p: 0.045%; ca: 0.010-0.030%; n is less than or equal to 0.09 percent; and Als: 0.050-0.080%; and the ratio of Ca/Als is 0.15-0.3; cryolite powder: 0.3-0.50%; the balance being Fe; the method comprises the following steps: s1: a refining process; s2: a continuous casting process; s3: a hot rolling step; s4: a coiling step; the Ca/Als ratio is controlled to be 0.15-0.30, so that the phenomenon that a molten steel solution expands a rod during casting can be prevented, further, casting powder in a crystallizer is mixed into the molten steel solution, the phenomenon that produced hot-rolled coils are clamped, and further, the production quality problem of the hot-rolled coils is easy to occur.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a crystallizer.
Background
The hot rolled coil is produced by using a plate blank as a raw material, heating the plate blank to prepare strip steel by a rough rolling unit and a finishing rolling unit, cooling a hot strip steel coming out of a last rolling mill in finish rolling to a set temperature through laminar flow, rolling the hot strip steel into a strip steel coil by a coiling machine, and processing the cooled strip steel coil into steel plate, flat coil and longitudinal cut strip steel products through different finishing operation lines according to different requirements of users through flattening, straightening, transverse cutting or longitudinal cutting, inspection, weighing, packaging, marking and the like.
Chinese patent discloses a hot-rolled coil and a production method thereof, and the patent application number is 2018109706831; the hot-rolled coil comprises the following chemical components in percentage by mass: 0.16-0.20% of C, 0.10-0.50% of Si, 1.20-1.50% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.007-0.070% of Nb, 0.020-0.050% of Als, 0.0010-0.0030% of Ca, less than or equal to 0.009% of N, and the balance of Fe and other residual elements of the raw materials.
Although trace alloy elements are added, the matching of strength and plasticity is further realized through a fine grain strengthening mechanism by utilizing the advantages of a 2250mm hot rolling production line and a controlled rolling and controlled cooling process, and the comprehensive mechanical property of the material is improved; however, when the existing hot-rolled coil is proportioned, if the added raw materials are too large or the proportion is not uniform, the phenomenon that the hot-rolled coil is easy to have slag inclusion defect during production can be caused, and the quality of the hot-rolled coil is further reduced; meanwhile, the existing production method of the hot-rolled coiled plate is difficult to control the phenomenon of slag inclusion in the molten steel in the blank shell when the blank shell is formed by the hot-rolled coiled plate.
Disclosure of Invention
In order to make up for the defects of the prior art, the crystallizer provided by the invention is mainly used for solving the problems that when the raw materials are proportioned, if the added raw materials are too large or the proportion is not uniform, the slag inclusion defect of the hot-rolled coil is easy to occur during production, and the quality of the hot-rolled coil is reduced; meanwhile, the existing production method of the hot-rolled coiled plate is difficult to control the phenomenon of slag inclusion in the molten steel in the blank shell when the blank shell is formed by the hot-rolled coiled plate.
The technical scheme adopted by the invention to solve the technical problem is as follows: the invention relates to a crystallizer, which is characterized in that the hot-rolled coil comprises the following chemical components in percentage by weight:
c: 0.12-0.20%; mn: 0.25 to 0.31 percent; si: 0.23-0.3%; s: 0.045%; p: 0.045%; ca: 0.010-0.030%; n is less than or equal to 0.09 percent; and Als: 0.050-0.080%; and the ratio of Ca/Als is 0.15-0.30; cryolite powder: 0.3-0.50%; the balance being Fe;
the added cryolite powder can eliminate slag inclusion of the nodular cast iron casting caused by magnesium sulfide and magnesium oxide, or a part of the cryolite powder is added at the bottom of the ladle and then added on the surface of molten steel solution;
the Ca/Als ratio is controlled to be 0.15-0.30, the phenomenon that a molten steel solution expands when casting is started can be prevented, if the phenomenon that the molten steel solution expands when casting is started is easy to cause the phenomenon that the molten steel solution entering a crystallizer fluctuates greatly, and then casting powder in the crystallizer is mixed into the molten steel solution, so that the phenomenon that produced hot-rolled plates are clamped, and the production quality problem of the hot-rolled plates is easy to occur.
A method for producing a hot-rolled coil, which is suitable for the production of the hot-rolled coil; the method comprises the following steps:
s1: a refining procedure: the LF furnace is used for controlling the processes of slagging, deoxidation, desulfurization and inclusion removal, ferromanganese, ferrosilicon and ferroniobium are added according to the components of the molten steel to finely adjust the components of the molten steel, and the content of silicon is 0.5 percent higher than that of manganese; then refining the molten steel by adopting an RH vacuum refining device; controlling the content of silicon to be 0.5 percent higher than that of manganese, and in order to form low-melting-point slag which is easy to float upwards in the steel metal solution, the covering slag in the crystallizer can absorb the slag conveniently;
s2: and (3) continuous casting process: the molten steel refined in the step S1 is transferred into a ladle, the molten steel solution in the ladle enters a tundish through a drainage tube, and the tundish needs to be blown with argon to exhaust air before casting; then injecting the molten steel into a group of water-cooled copper crystallizers through a plurality of injection pipes, gradually solidifying the molten steel into blank shells along the peripheries of the crystallizers, pulling out blanks by a withdrawal and straightening machine after the liquid steel level rises to a certain height and the blank shells are solidified to a certain thickness, and completely solidifying the casting blanks by water spray cooling in a secondary cooling area; before casting, argon blowing and air exhaust are needed to be carried out on the intermediate tank, so that the phenomenon of secondary oxidation when molten steel solution enters the intermediate tank can be prevented;
s3: a hot rolling procedure: rolling the casting blank obtained in the step S2 by adopting a 1580 roughing mill as a four-roller reversible mill with vertical rollers for 5-7 times, and thinning the blank to 25-50 mm; then the hot coil box is used for preserving the heat of the intermediate billet, seven-point descaling is adopted in a rolling line, the high-pressure water descaling capacity is strong, and the working pressure is more than or equal to 20 MPa; then, carrying out finish rolling on the rolled plate with the oxide skin removed by a finish rolling mill;
s4: a coiling step: adopting 1580 coiling equipment to perform coiling ancestor operation on the rolled plate cooled in the step S3;
the crystallizer consists of composite wall plates, an inner wall copper plate and an outer wall steel cooling water tank, wherein each composite wall plate is connected by a stud; the outer side surface of the inner wall copper plate is milled with a cooling groove; a water inlet pipe is arranged on one side of the cooling water washing, and a water outlet pipe is arranged on the other side wall of the cooling water washing; the bottom end of the flow injection pipe extends into the inner wall copper plate, and the outer circumferential wall of the bottom end of the flow injection pipe is provided with a plurality of liquid guide holes; liquid guide nozzles are obliquely and downwards arranged in the liquid guide holes and are all positioned below the liquid level of molten steel solution; a shunt arc block is arranged inside the bottom end of the flow injection pipe and is positioned at the pipe orifice of the liquid guide nozzle; a protective slag layer is arranged above the molten steel solution on the inner wall of the inner wall copper plate; when the device works, after molten steel solution enters the tundish, the molten steel solution enters the bottom end of the injection pipe, the molten steel solution is divided into a plurality of liquid guiding nozzles which incline downwards by the dividing arc block arranged on the inner wall of the bottom end of the injection pipe, then flows into the molten steel solution in the copper plate on the inner wall through the liquid guiding nozzles, and then the molten steel solution can be uniformly introduced into a steel plate which is solidified to form a shell inside the crystallizer through the matching of the dividing arc block and the liquid guiding nozzles which are obliquely arranged, so that the molten steel solution can stably flow in a molten steel flow path, and the molten steel solution is effectively prevented from forming a columnar fluid and impacting the molten steel flow field of the crystallizer due to the immersed injection pipe arranged in the existing crystallizer and the bottom end of the injection pipe is in an open state, therefore, the phenomenon that the molten steel flow field rolls upwards is easily caused, the phenomenon that the covering slag arranged on the upper surface of the molten steel flow field is disordered or precipitated downwards in the rolling state of the molten steel is easily caused, the phenomenon that the produced hot-rolled plate is mixed with the covering slag is caused, meanwhile, the phenomenon that the protective film formed on the upper surface of the molten steel flow field of the covering slag layer is broken is caused, and the protective effect of the covering slag layer on the molten steel flow field is further influenced.
Preferably, the inclined included angle formed by the liquid guiding nozzle and the liquid level of the molten steel positioned above the liquid guiding nozzle is 21-25 degrees; the cross section of the liquid guide nozzle is of a square hole structure, and the expansion angle of the liquid guide nozzle of the square structure is 12-16 degrees; the height from the top ends of the liquid guide nozzles to the bottom end face of the protective slag is 90-105 mm; if the downward inclination included angle of the liquid guide nozzle is too large, molten steel solution sprayed by the liquid guide nozzle is easy to impact on a formed blank shell, so that the phenomenon that a hot-rolled coil is sunken or holes appear in the hot-rolled coil is caused, and the production quality of the hot-rolled coil is influenced; if the inclined included angle of the liquid guiding nozzle is too small, molten steel solution sprayed out of the liquid guiding nozzle is impacted to the upper side, so that a rolling phenomenon is generated above a molten steel flow field; meanwhile, the liquid guide nozzle with the square structure can increase the area of the molten steel solution flowing out of the liquid guide nozzle, and the impact force of the molten steel solution flowing out of the molten steel flow field can be reduced and the rolling phenomenon of the molten steel flow field is reduced due to the poor fluidity of the molten steel solution in the crystallizer.
Preferably, the upper end of the inner wall copper plate is provided with a limiting groove, and the limiting groove is internally inserted with a metal filter screen plate in a sliding manner; the metal filter screen plate is positioned in the covering slag layer; the protective slag layer comprises a slag powder layer, a sintering layer and a melting layer; the metal filter screen plate is positioned in the middle of the sintering layer; the arranged metal filter screen plate can ensure that the protective slag can form a stable protective film layer on the upper surface of the molten steel flow field, so that the phenomena of poor protective layer forming time and unstable protective layer caused by loose protective slag are prevented, and the heat insulation effect of the protective slag layer on the molten steel flow field is further influenced; meanwhile, the metal filter screen plate is positioned in the sintering layer, so that the melting layer can adsorb and dissolve non-metal impurities floating up to a steel slag interface, and the phenomenon that the surface or the lower skin of the hot-rolled coil plate has defects due to the fact that slag inclusion floating up in molten steel solution is involved in a solidified shell is effectively prevented; and the content of silicon is controlled to be 0.5 percent higher than that of manganese, so that molten slag with low melting point and easy floating is formed in the steel metal solution, and the layered protective slag layer can be better absorbed.
Preferably, a plurality of slag guide pipes are arranged in the horizontal direction of the metal filter screen plate, and a plurality of spray holes are formed in the slag guide pipes; the end parts of the plurality of leading pipes are communicated through a communicating pipe, and the communicating pipe is communicated with an external casting powder leading-in pipe; the casting powder on the casting powder layer can be injected into the slag guide pipe through the communicating pipe and then uniformly dispersed into the casting powder layer through the spray holes, and the casting powder feeding amount is controlled according to the principle of duty, lack and uniformity, so that the phenomenon of slag adjusting strips can be reduced; meanwhile, the phenomenon that the casting powder cannot be completely melted on the upper surface of a molten steel flow field due to the influence of a metal filter screen and the casting powder layer is precipitated downwards, and the phenomenon that a crystallizer solidifies and crusts the molten steel solution is further influenced due to the fact that the casting powder is excessively fed is prevented.
Preferably, the covering slag of the covering slag layer is prepared from the following raw materials in percentage by weight: SiO 2: 45-60 percent; CaO: 30-50%; al 2O 3: 5-15%; FeO: less than or equal to 1 percent; carbonaceous material: 2-5%;
wherein SiO 2 is easy to absorb scum TiO 2 which is difficult to dissolve; CaO easily absorbs Al 2O 3 and Cr 2O 3; controlling FeO: the oxidizability of the slag can be reduced by less than or equal to 1 percent; carbonaceous material: the amount of 2-5% of the slag can be controlled to prevent the phenomenon of rod expansion of molten steel solution during casting, and if the phenomenon of rod expansion occurs during casting, the slag in the crystallizer is mixed into the molten steel solution, the slag inclusion phenomenon of the produced hot-rolled coil is caused, and the production quality problem of the hot-rolled coil is easy to occur.
The invention has the following beneficial effects:
1. the slag inclusion of the nodular cast iron casting caused by magnesium sulfide and magnesium oxide can be eliminated by the added cryolite powder; the Ca/Als ratio is controlled to be 0.08-0.12, liquid can stably flow in the molten steel flow, the phenomenon that a molten steel flow field rolls upwards is further prevented, and the phenomenon that protective slag is mixed in the produced hot-rolled coil is effectively reduced. The content of silicon is controlled to be 0.5 percent higher than that of manganese, so that molten slag with low melting point and easy floating is formed in the steel metal solution, and the molten slag is convenient to absorb by the covering slag in the crystallizer.
2. According to the invention, through the matching of the shunting arc block and the plurality of the liquid guiding nozzles which are obliquely arranged, the shunting arc block can uniformly divide the molten steel solution into the liquid guiding nozzles, and then the liquid guiding nozzles can uniformly introduce the molten steel solution into the steel plate which is solidifying to form a shell inside the crystallizer, so that the melting speed of molten steel slag is increased.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method of producing a hot rolled coil of the present invention;
FIG. 2 is a perspective view of the crystallizer of the present invention;
FIG. 3 is a sectional view of the crystallizer of the present invention;
in the figure: crystallizer 1, inner wall copper 2, cooling bath 3, cooling water tank 4, inlet tube 5, notes flow pipe 6, drain hole 7, drain nozzle 8, reposition of redundant personnel arc 9, metal filter screen board 10, slag guide pipe 11, orifice 111, communicating pipe 12.
Detailed Description
A crystallizer according to an embodiment of the present invention will be described below with reference to fig. 1 to 3.
The first embodiment is as follows:
according to the embodiment of the invention, the hot-rolled coil comprises the following chemical components in percentage by mass: 0.16 percent; mn: 0.27 percent; si: 0.28 percent; s: 0.045%; p: 0.045%; ca: 0.015 percent; n: 0.09%; and Als: 0.058%; cryolite powder: 0.3 percent; the balance of Fe; the hot-rolled coil is produced by adopting the production method of the hot-rolled coil.
Example two:
according to the embodiment of the invention, the hot-rolled coil comprises the following chemical components in percentage by mass: 0.16 percent; mn: 0.27 percent; si: 0.28 percent; s: 0.045%; p: 0.045%; ca: 0.020%; n: 0.09%; and Als: 0.067%; cryolite powder: 0.38 percent; the balance of Fe; the hot-rolled coil is produced by adopting the production method of the hot-rolled coil.
Example three:
according to the embodiment of the invention, the hot-rolled coil comprises the following chemical components in percentage by mass: 0.16 percent; mn: 0.27 percent; si: 0.28 percent; s: 0.045%; p: 0.045%; ca: 0.025 percent; n: 0.09%; and Als: 0.074%; cryolite powder: 0.44%; the balance of Fe; the hot-rolled coil is produced by adopting the production method of the hot-rolled coil.
Example four:
according to the embodiment of the invention, the hot-rolled coil comprises the following chemical components in percentage by mass: 0.16 percent; mn: 0.27 percent; si: 0.28 percent; s: 0.045%; p: 0.045%; ca: 0.030%; n: 0.09%; and Als: 0.080%; cryolite powder: 0.50 percent; the balance of Fe; the hot-rolled coil is produced by adopting the production method of the hot-rolled coil.
A method of producing a hot rolled coil, which is applicable to the production of the above-described hot rolled coil, as shown in fig. 1 to 3; the method comprises the following steps:
s1: a refining procedure: the LF furnace is used for controlling the processes of slagging, deoxidation, desulfurization and inclusion removal, ferromanganese, ferrosilicon and ferroniobium are added according to the components of the molten steel to finely adjust the components of the molten steel, and the content of silicon is 0.5 percent higher than that of manganese; then refining the molten steel by adopting an RH vacuum refining device; controlling the content of silicon to be 0.5 percent higher than that of manganese, and in order to form low-melting-point slag which is easy to float upwards in the steel metal solution, the covering slag in the crystallizer 1 can absorb the slag conveniently;
s2: and (3) continuous casting process: the molten steel refined in the step S1 is transferred into a ladle, the molten steel solution in the ladle enters a tundish through a drainage tube, and the tundish needs to be blown with argon to exhaust air before casting; then the molten steel is injected into a group of water-cooled copper crystallizers 1 through a plurality of injection pipes 6, the molten steel is gradually solidified into blank shells along the periphery of the crystallizers 1, after the molten steel level rises to a certain height, the blank shells are solidified to a certain thickness, and then the blanks are pulled out by a withdrawal and straightening machine, and the casting blanks are completely solidified through water spray cooling in a secondary cooling area; before casting, argon blowing and air exhaust are needed to be carried out on the intermediate tank, so that the phenomenon of secondary oxidation when molten steel solution enters the intermediate tank can be prevented;
s3: a hot rolling procedure: rolling the casting blank obtained in the step S2 by adopting a 1580 roughing mill as a four-roller reversible mill with vertical rollers for 5-7 times, and thinning the blank to 25-50 mm; then the hot coil box is used for preserving the heat of the intermediate billet, seven-point descaling is adopted in a rolling line, the high-pressure water descaling capacity is strong, and the working pressure is more than or equal to 20 MPa; then, carrying out finish rolling on the rolled plate with the oxide skin removed by a finish rolling mill;
s4: a coiling step: coiling the rolled plate cooled in the step S3 by adopting 1580 coiling equipment;
the crystallizer 1 is composed of each composite wall plate, an inner wall copper plate 2 and an outer wall steel cooling water tank 4 which are connected through a stud; the outer side surface of the inner wall copper plate 2 is milled with a cooling groove 3; a water inlet pipe 5 is arranged on one side of the cooling water washing, and a water outlet pipe is arranged on the other side wall of the cooling water washing; the bottom end of the injection pipe 6 extends into the inner wall copper plate 2, and the outer circumferential wall of the bottom end of the injection pipe 6 is provided with a plurality of liquid guide holes 7; a plurality of liquid guide nozzles 8 are obliquely and downwards arranged in the liquid guide holes 7, and the plurality of liquid guide nozzles 8 are all positioned below the liquid level of the molten steel solution; a shunt arc block 9 is arranged inside the bottom end of the flow injection pipe 6, and the shunt arc block 9 is positioned at the pipe orifice of the liquid guide nozzle 8; a protective slag layer is arranged above the molten steel solution on the inner wall of the inner wall copper plate 2; when the device works, after molten steel solution enters the tundish, the molten steel solution enters the bottom end of the injection pipe 6, the molten steel solution is divided into a plurality of liquid guiding nozzles 8 which are obliquely downward by the dividing arc block 9 arranged on the inner wall of the bottom end of the injection pipe 6, then flows into the molten steel solution in the inner wall copper plate 2 through the liquid guiding nozzles 8, and then the molten steel solution can be uniformly introduced into a steel plate which is solidified to form a shell in the crystallizer 1 by the matching of the dividing arc block 9 and the liquid guiding nozzles 8 which are obliquely arranged, so that the molten steel solution can stably flow in a molten steel flow path, the immersed injection pipe 6 arranged in the existing crystallizer 1 is effectively prevented, the bottom end of the injection pipe 6 is in an open state, and further the molten steel solution forms a columnar fluid and impacts the molten steel flow field of the crystallizer 1, therefore, the phenomenon that the molten steel flow field rolls upwards is easily caused, the phenomenon that the covering slag arranged on the upper surface of the molten steel flow field is disordered or precipitated downwards in the rolling state of the molten steel is easily caused, the phenomenon that the produced hot-rolled plate is mixed with the covering slag is caused, meanwhile, the phenomenon that the protective film formed on the upper surface of the molten steel flow field of the covering slag layer is broken is caused, and the protective effect of the covering slag layer on the molten steel flow field is further influenced.
In one embodiment of the present invention, an inclined angle formed by the liquid guiding nozzle 8 and a molten steel liquid surface located above the liquid guiding nozzle 8 is 21-25 °; the cross section of the liquid guide nozzle 8 is of a square hole structure, and the expansion angle of the liquid guide nozzle 8 of the square structure is 12-16 degrees; the height from the top ends of the liquid guide nozzles 8 to the bottom end face of the protective slag is 90-105 mm; if the downward inclination included angle of the liquid guide nozzle 8 is too large, molten steel solution sprayed by the liquid guide nozzle 8 is easy to impact on a blank shell which is being formed, and further, the phenomenon that a hot-rolled coil is sunken or holes appear inside the hot-rolled coil is caused, and the production quality of the hot-rolled coil is influenced; if the inclined included angle of the liquid guiding nozzle 8 is too small, the molten steel solution sprayed by the liquid guiding nozzle 8 is impacted to the upper part, so that the phenomenon of rolling over the molten steel flow field is generated; meanwhile, the liquid guide nozzle 8 with the square structure is arranged, so that the area of the molten steel solution flowing out of the liquid guide nozzle 8 can be increased, and the impact force of the molten steel solution flowing out of the molten steel flow field can be reduced and the rolling phenomenon of the molten steel flow field is reduced due to the poor liquidity of the molten steel solution in the crystallizer 1.
As an embodiment of the invention, the upper end of the inner wall copper plate 2 is provided with a limit groove, and the metal filter screen plate 10 is inserted in the limit groove in a sliding manner; the metal filter screen plate 10 is positioned in the covering slag layer; the protective slag layer comprises a slag powder layer, a sintering layer and a melting layer; the metal filter screen plate 10 is positioned in the middle of the sintering layer; the arranged metal filter screen plate 10 can ensure that the protective slag can form a stable protective film layer on the upper surface of the molten steel flow field, so that the phenomena of poor protective layer forming time and unstable protective layer caused by loose protective slag are prevented, and the heat insulation effect of the protective slag layer on the molten steel flow field is further influenced; meanwhile, the metal filter screen plate 10 is positioned in the sintering layer, so that the melting layer can adsorb and dissolve non-metal impurities floating up to a steel slag interface, and the phenomenon that the surface or the lower skin of a hot-rolled coil plate has defects due to the fact that slag inclusion floating up in a molten steel solution is involved in a solidified shell is effectively prevented; and the content of silicon is controlled to be 0.5 percent higher than that of manganese, so that molten slag with low melting point and easy floating is formed in the steel metal solution, and the layered protective slag layer can be better absorbed.
As an embodiment of the present invention, a plurality of slag guide pipes 11 are arranged in the horizontal direction of the metal filter screen plate 10, and a plurality of spray holes 111 are formed on the slag guide pipes 11; the ends of the plurality of lead pipes are communicated through a communicating pipe 12, and the communicating pipe 12 is communicated with an external mold flux introduction pipe; the casting powder on the casting powder layer can be injected into the slag guide pipe 11 through the communicating pipe 12 and then uniformly dispersed into the casting powder layer through the spray holes 111, and the casting powder feeding amount is controlled according to the principle of duty, lack and uniformity, so that the phenomenon of slag adjustment strips can be reduced; meanwhile, the phenomenon that the casting powder cannot be completely melted on the upper surface of a molten steel flow field due to the influence of a metal filter screen and the casting powder layer is precipitated downwards, and the phenomenon that the crystallizer 1 solidifies and crusts the molten steel solution is further prevented.
As an embodiment of the invention, the mold flux of the mold flux layer is prepared from the following raw materials in percentage by weight: SiO 2: 45-60 percent; CaO: 30-50%; al 2O 3: 5-15%; FeO: less than or equal to 1 percent; carbonaceous material: 2-5%;
wherein SiO 2 is easy to absorb scum TiO 2 which is difficult to dissolve; CaO easily absorbs Al 2O 3 and Cr 2O 3; controlling FeO: the oxidizability of the slag can be reduced by less than or equal to 1 percent; carbonaceous material: the melting speed of the slag can be controlled by 2-5%.
The specific working process is as follows:
when the casting mould works, after molten steel enters the tundish, the molten steel enters the bottom end of the injection pipe 6, the molten steel is divided into a plurality of liquid guiding nozzles 8 which are obliquely downward by the dividing arc block 9 arranged on the inner wall of the bottom end of the injection pipe 6, then the molten steel flows into the molten steel in the inner wall copper plate 2 through the liquid guiding nozzles 8, then the molten steel can be uniformly introduced into a steel plate which is in solidification and forms a billet shell in the crystallizer 1 by the matching of the dividing arc block 9 and the liquid guiding nozzles 8 which are obliquely arranged, the dividing arc block 9 can uniformly divide the molten steel into the liquid guiding nozzles 8, then the liquid guiding nozzles 8 can uniformly introduce the molten steel into the steel plate which is in solidification and forms the billet shell, the billet is drawn out by the withdrawal and straightening machine after the billet shell is solidified to a certain thickness, and the billet is completely solidified by cooling water spraying of a secondary cooling area.
In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A crystallizer, characterized by: the crystallizer (1) is composed of each composite wall plate and an inner wall copper plate (2) and an outer wall steel cooling water tank (4) which are connected by a stud; the outer side surface of the inner wall copper plate (2) is milled with a cooling groove (3); a water inlet pipe is arranged on one side of the cooling water tank (4), and a water outlet pipe is arranged on the other side wall of the cooling water tank; the bottom end of the injection pipe (6) extends into the inner wall copper plate (2), and the outer circumferential wall at the bottom end of the injection pipe (6) is provided with a plurality of liquid guide holes (7); liquid guide nozzles (8) are obliquely and downwards arranged in the liquid guide holes (7), and the liquid guide nozzles (8) are all positioned below the liquid level of molten steel solution; a shunt arc block (9) is arranged inside the bottom end of the flow injection pipe (6), and the shunt arc block (9) is positioned at the pipe orifice of the liquid guide nozzle (8); and a protective slag layer is arranged above the molten steel solution on the inner wall of the inner wall copper plate (2).
2. A crystallizer as claimed in claim 1, characterized in that: the inclined included angle formed by the liquid guiding nozzle (8) and the liquid level of the molten steel positioned above the liquid guiding nozzle (8) is 21-25 degrees; the cross section of the liquid guide nozzle (8) is of a square hole structure, and the expansion angle of the liquid guide nozzle (8) of the square structure is 12-16 degrees; the height from the top ends of the liquid guide nozzles (8) to the bottom end face of the protective slag is 90-105 mm.
3. A crystallizer as claimed in claim 2, characterized in that: the upper end of the inner wall copper plate (2) is provided with a limiting groove, and a metal filter screen plate (10) is inserted in the limiting groove in a sliding manner; the metal filter screen plate (10) is positioned in the covering slag layer; the protective slag layer comprises a slag powder layer, a sintering layer and a melting layer; the metal filter screen plate (10) is positioned in the middle of the sintering layer.
4. A crystallizer as claimed in claim 3, characterized in that: a plurality of slag guide pipes (11) are arranged in the horizontal direction of the metal filter screen plate (10), and a plurality of spray holes (111) are formed in the slag guide pipes (11); the ends of the plurality of lead pipes are communicated through a communication pipe (12), and the communication pipe (12) is communicated with an external mold flux introduction pipe.
5. A crystallizer as claimed in claim 4, characterized in that: the covering slag of the covering slag layer is prepared from the following raw materials in percentage by weight: SiO 2: 45-60 percent; CaO: 30-50%; al 2O 3: 5-15%; FeO: less than or equal to 1 percent; carbonaceous material: 2-5%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775556A (en) * | 2009-12-30 | 2010-07-14 | 首钢总公司 | X65 hot-rolled coil for use in acidic environment and manufacturing method thereof |
| CN104624995A (en) * | 2015-02-27 | 2015-05-20 | 安徽工业大学 | Device for inhibiting mold level fluctuation at high drawing speed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5996217A (en) * | 1982-11-24 | 1984-06-02 | Sumitomo Metal Ind Ltd | Manufacture of steel with superior sulfide cracking resistance |
| SU1266894A1 (en) * | 1984-08-03 | 1986-10-30 | Металлургический Ордена Трудового Красного Знамени Завод Им.А.К.Серова | Steel |
| JP3249646B2 (en) * | 1993-07-16 | 2002-01-21 | 川崎製鉄株式会社 | Machine structural steel with excellent machinability and cold forgeability |
| JP4528137B2 (en) * | 2004-03-19 | 2010-08-18 | 新日本製鐵株式会社 | Manufacturing method of high strength and high ductility steel sheet with excellent hole expandability |
| EP2003221B1 (en) * | 2006-04-04 | 2016-05-25 | Nippon Steel & Sumitomo Metal Corporation | Hard extra-thin steel sheet and method for manufacturing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775556A (en) * | 2009-12-30 | 2010-07-14 | 首钢总公司 | X65 hot-rolled coil for use in acidic environment and manufacturing method thereof |
| CN104624995A (en) * | 2015-02-27 | 2015-05-20 | 安徽工业大学 | Device for inhibiting mold level fluctuation at high drawing speed |
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Effective date of registration: 20220901 Address after: East of North Yinhe Road, Qianquan Village, Zhengzhuangzi Town, Kaiping District, Tangshan City, Hebei Province, 063021 Patentee after: Tangshan Boye Industrial Technology Co.,Ltd. Address before: 230000 5216 (South), North building, original animation Park, No.19 Tianzhi Road, high tech Zone, Shushan District, Hefei City, Anhui Province Patentee before: Hefei yizhigu Machinery Design Co.,Ltd. |