CN105665662A - ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires - Google Patents
ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 115
- 239000010959 steel Substances 0.000 title claims abstract description 115
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000009749 continuous casting Methods 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 46
- 238000001816 cooling Methods 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 238000009628 steelmaking Methods 0.000 claims abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 238000007872 degassing Methods 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 16
- 238000007654 immersion Methods 0.000 claims description 13
- 230000004907 flux Effects 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
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- 229910052751 metal Inorganic materials 0.000 abstract description 5
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- 238000005097 cold rolling Methods 0.000 description 6
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- 239000002893 slag Substances 0.000 description 5
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- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 1
- MUBKMWFYVHYZAI-UHFFFAOYSA-N [Al].[Cu].[Zn] Chemical compound [Al].[Cu].[Zn] MUBKMWFYVHYZAI-UHFFFAOYSA-N 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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Abstract
The invention provides an ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires. The method comprises steps as follows: a steel-making phase: blast furnace molten iron is sequentially subjected to desulfuration, converter smelting, refining and vacuum circulating degassing to form molten steel; an ESP continuous casting and continuous rolling phase: on the basis of an ESP line, the molten steel formed in the steel-making phase is subjected to continuous casting and continuous rolling to form thin-gauge hot-rolled steel strips; a cooling phase: the thin-gauge hot-rolled steel strips formed in the ESP continuous casting and continuous rolling phase are subjected to laminar cooling; a coiling phase: the thin-gauge hot-rolled steel strips subjected to laminar cooling is coiled to form roll-shaped hot-rolled coils; a pickling phase: the roll-shaped hot-rolled coils coiled in the coiling phase are pickled; a leveling and re-coiling phase: the pickled hot-rolled coils are leveled and re-coiled, and the steel for the flux-cored wires is obtained. With the adoption of the method, energy consumption can be reduced, the metal yield can be increased, and the production cost can be reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for manufacturing steel for a flux-cored wire based on an ESP (electronic stability program) wire.
Background
Flux cored wires, also known as tubular wires, are a type of consumable material in powder-cored wires that is used exclusively for welding. The flux-cored wire consists of a metal sheath and a powder core, wherein the sheath is made of low-carbon steel, stainless steel, aluminum, copper, zinc and other materials with certain ductility, and the core is made of various metal or nonmetal powders, mineral powders, chemical products, nano materials and the like in a large range according to the requirements of product purposes.
At present, the main raw material for producing steel for flux-cored wires is cold-rolled steel strips, which are generally continuously rolled and formed on a forming machine, and powder is synchronously added, and then drawn and reduced to finished welding wires on a linear wire drawing machine. Wherein, the width and thickness of the cold-rolled steel strip are generally selected according to the variety of the flux-cored wire.
The traditional specific process for producing the steel for the flux-cored wire comprises the following steps: high-quality blast furnace molten iron → KR desulfurization → converter smelting → LF refining → RH degassing → continuous casting → casting blank secondary heating → rough rolling → finish rolling → laminar cooling → coiling → acid washing → cold rolling → annealing → flattening → recoiling → sampling → packaging → warehousing.
According to the process, the casting blank needs to be heated for the second time in the traditional process of producing the flux-cored wire, and is cooled again after the processes of rough rolling, finish rolling and the like, so that on one hand, the yield of metal is reduced, and the production cost is increased; on the other hand, the traditional process for producing the flux-cored wire needs heating and cooling, reheating and cooling again, so that the energy consumption is increased, the emission of greenhouse gases and harmful gases is increased, and the environmental pollution is caused; moreover, since the width and thickness of the cold-rolled steel strip need to be selected according to the variety of the flux-cored wire, the amount of the steel strip dedicated to the flux-cored wire rapidly increases with the increase of the flux-cored wire, which undoubtedly increases the cost for producing the flux-cored wire. In addition, at present, the cold-rolled steel strip used for producing the steel for the flux-cored wire must be produced after the hot-rolled coil is subjected to the relevant processes of pickling, cold rolling, annealing, leveling and the like, and the production cost is inevitably increased due to the multiple processes.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for manufacturing steel for a flux-cored wire based on an ESP wire, so as to solve the problems of high production cost, large environmental pollution, etc. of the conventional method for manufacturing steel for a flux-cored wire.
The invention provides a method for manufacturing steel for a flux-cored wire based on an ESP wire, which comprises the following steps: a steel-making stage: the blast furnace molten iron is sequentially subjected to desulfurization, converter smelting, refining and vacuum circulating degassing to form molten steel; ESP continuous casting and rolling stage: continuously casting and rolling molten steel formed in the steelmaking stage on the basis of an ESP line to form a thin hot rolled steel strip; in the ESP continuous casting and rolling stage, the friction force between a crystallizer and a billet shell and the temperature distribution of molten steel in the crystallizer are controlled by adopting a non-sinusoidal vibration mode of the crystallizer and a braking duckbill-shaped water immersion inlet, the molten steel is continuously cast to form a continuous casting billet after primary cooling and secondary cooling through a bending section with liquid core pressing, an arc section with straightening and a horizontal section of the crystallizer, the continuous casting billet is rolled into an intermediate billet through a roughing mill, the intermediate billet is subjected to high-pressure water descaling treatment after electromagnetic induction heating, and the intermediate billet subjected to high-pressure water descaling treatment is rolled into a thin hot-rolled coil through a finishing mill without a head; wherein, the inner hole of the brake duckbill type immersion water inlet comprises two openings, and the side wall of each opening is respectively provided with a guide hole which inclines downwards; and (3) a cooling stage: carrying out laminar cooling on the thin hot rolled steel strip formed in the ESP continuous casting and rolling stage; and (3) a coiling stage: coiling the thin hot rolled steel strip subjected to laminar cooling to form a reel-shaped hot rolled coil; acid washing stage: pickling the coiled hot rolled coil in the coiling stage; leveling and rewinding stage: and flattening and recoiling the hot rolled coil after acid washing to obtain the steel for the flux-cored wire.
Further, a preferred embodiment is: after primary cooling and secondary cooling are carried out on a bending section with hydraulic core pressure, an arc section with straightening and a horizontal section through electromagnetic braking of a crystallizer, molten steel is continuously cast to form a continuous casting billet, the continuous casting billet enters an HRM (high-speed melting) machine for rough rolling, and the continuous casting billet is rolled into an intermediate billet through the HRM; ensuring the surface temperature of the intermediate billet by an IHF induction heating furnace, and simultaneously carrying out high-pressure water descaling treatment on the iron scale on the surface of the intermediate billet; and (3) feeding the intermediate blank subjected to high-pressure water descaling treatment into a finishing mill, and rolling the intermediate blank subjected to high-pressure water descaling into a thin hot rolled steel strip in a completely endless manner by the finishing mill.
Further, a preferred embodiment is: and in the process of carrying out laminar cooling on the thin hot rolled steel strip formed in the ESP continuous casting and rolling stage, feeding the thin hot rolled steel strip into an output roller way, and feeding the thin hot rolled steel strip into a coiler through a pinch roll of the output roller way.
Further, a preferred embodiment is: in the process of winding the thin hot rolled steel strip subjected to the laminar cooling into a roll-shaped hot rolled coil, the thin hot rolled steel strip is wound by a winding machine.
By utilizing the method for manufacturing the steel for the flux-cored wire based on the ESP line, provided by the invention, the molten steel is directly subjected to continuous casting and continuous rolling by utilizing the ESP line, so that the steps of 'continuous casting → casting blank secondary heating → rough rolling → finish rolling → laminar cooling → coiling → acid cleaning → cold rolling → annealing' and the like in the traditional process are replaced, the energy consumption can be further reduced, and meanwhile, the cold rolling link can be reduced, the metal yield is improved and the production cost is reduced by replacing the cold rolled steel strip with the hot rolled coil to produce the steel for the flux-cored wire.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow diagram of a method for manufacturing steel for an ESP wire-based flux cored welding wire according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the brake type duckbill type immersion nozzle.
The same reference numbers in all figures indicate similar or corresponding features or functions.
In the figure, the nozzle side wall 1, the bottom 2, the inner hole 3, the opening 31, the opening 32, the diversion hole 311 and the diversion hole 321.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
An ESP (endless strip production) line is a new generation of thin slab continuous casting and rolling production line newly built by Avermedi, and has the characteristics of full-continuous strip production, excellent production capacity of a single continuous casting line, large-scale production of large-bandwidth strip steel and high-quality strip steel, low conversion cost from molten steel to hot rolled coils, most compact production line process arrangement and the like because the continuous casting speed can reach 7m/min at most, a whole strip steel can be produced in one casting process, and no head and tail are cut in the middle.
In order to illustrate the manufacturing method of the steel for flux-cored wire production based on the ESP line provided by the present invention, fig. 1 shows the flow of the manufacturing method of the steel for flux-cored wire production based on the ESP line according to the embodiment of the present invention; fig. 2 shows the structure of the brake type duckbill type immersion nozzle.
As shown in fig. 1, the method for manufacturing a steel for an ESP wire-based flux-cored wire according to the present invention includes:
s110: a steel-making stage: and (3) sequentially carrying out desulfurization, converter smelting, refining and vacuum circulating degassing on blast furnace molten iron to form molten steel.
Specifically, the blast furnace molten iron may be desulfurized by a desulfurization apparatus (e.g., KR desulfurization apparatus), and the desulfurized blast furnace molten iron may be subjected to converter smelting, refining, vacuum circulation degassing, and other steps to finally form molten steel.
S120: ESP continuous casting and rolling stage: continuously casting and rolling molten steel formed in the steelmaking stage on the basis of an ESP line to form a thin hot rolled steel strip; in the ESP continuous casting and rolling stage, the friction force between the crystallizer and a billet shell and the temperature distribution of molten steel in the crystallizer are controlled by adopting a non-sinusoidal vibration mode of the crystallizer and a braking duckbilled water immersion inlet, the molten steel is continuously cast to form a continuous casting billet after primary cooling and secondary cooling through a bending section with liquid core pressing, an arc section with straightening and a horizontal section of the crystallizer, the continuous casting billet is rolled into an intermediate billet through a roughing mill, the intermediate billet is subjected to electromagnetic induction heating and high-pressure water descaling treatment, and the treated intermediate billet is completely rolled into a thin hot-rolled steel strip through a finishing mill without heads; wherein, the braking duckbilled water immersion inlet is provided with a plurality of diversion holes along the circumferential direction on the side wall of the water gap along the tangential direction of the inner hole.
Specifically, as shown in fig. 2, in the ESP continuous casting and rolling stage, the molten steel firstly enters the brake duckbill-shaped immersion nozzle, and in the brake duckbill-shaped immersion nozzle, the diversion holes are circumferentially formed in the nozzle side wall in the tangential direction of the inner hole, so that when the molten steel is poured, the fluctuation of the crystallizer liquid level generated when the molten steel is poured can be effectively braked through the diversion holes, the temperature distribution of the molten steel in the crystallizer is uniform, slag entrapment caused in the continuous casting process is avoided, and the quality of the continuous casting billet is improved.
As shown in fig. 2, the braking duckbill immersion nozzle is composed of a nozzle side wall 1, a bottom 2, and an inner hole 3 with an open top end, which is enclosed by the nozzle side wall and the bottom. Wherein, mouth of a river lateral wall 1 and bottom body design, hole 3 are duckbilled, including opening 31 and opening 32, are provided with water conservancy diversion hole 311 and the water conservancy diversion hole 321 of downward sloping respectively on the lateral wall of opening 31 and opening 32. The central lines of the diversion holes 311 and 321 are parallel to the central connecting line between the opening 31 and the opening 32, and the outlets of the diversion holes 311 and 321 are provided with a bevel angle which can cause the flow to generate outward expansion in the same rotation direction.
The brake duckbill type water immersion nozzle can rapidly guide the superheat degree of molten steel, stabilize the consumption of protective slag and form a uniform slag film, and meanwhile, a stream can be cut through an outward-expanding oblique angle which is arranged at the outlet of the flow guide hole and enables the stream to generate the same rotation direction, the rising kinetic energy of the stream is attenuated, so that the stream slowly reaches the position near the liquid level of the crystallizer, and the fluctuation of the liquid level of the crystallizer is stable.
In addition, because the pressure of the liquid protective slag film at the meniscus in the crystallizer is increased in the negative slipping process to force the blank shell to generate inward bending deformation to cause oscillation marks, and because the geometric shape, the microstructure, the alloy components and the like of the oscillation marks are discontinuous, the defects of the casting blank are easily induced, therefore, in the invention, a non-sinusoidal vibration mode is adopted, and the time of the negative slipping of the crystallizer during vibration is shortened by changing the vibration speed distribution, thereby reducing the deformation of the blank shell caused by the pressure of the protective slag path and promoting the depth of the oscillation marks to be shallow. By adopting the non-sinusoidal vibration mode and the braking duckbill-shaped water immersion inlet, the friction force between the crystallizer and the billet shell and the temperature distribution of molten steel in the crystallizer can be effectively controlled, so that a foundation is laid for casting a high-quality casting blank.
In addition, because continuous production from molten steel to hot rolled coils can be realized only under the condition of stably achieving high drawing speed, and for the high drawing speed (namely high flow rate, generally, a common casting machine can only achieve about 5 m/min), the traditional thin slab continuous casting machine is difficult to achieve, and high drawing speed and full endless rolling can not be realized. The invention adopts the bending section with the hydraulic core under pressure and the arc section with the straightening in the ESP line, can realize high drawing speed (up to 7m/min), can keep the ferrostatic pressure very low, can greatly improve the quality of continuous casting billets, can produce 'a whole steel strip' in one casting time, does not have any head and tail cutting in the middle, can reduce the waste of casting billets and saves the production cost.
In addition, in order to avoid the fluctuation caused by the high drawing speed to the crystallizer flow field and the crystallizer meniscus, an external magnetic field can be applied to the molten steel in the crystallizer by adopting electromagnetic braking, so that the flow track of the molten steel is influenced, the crystallizer flow field mode is kept, the stability of the crystallizer meniscus is maintained, the initial solidification of the continuous casting billet and the formation of a billet shell in the upper area of a continuous casting machine are reliably controlled, the high operation stability at the high drawing speed is further ensured, and the quality of the continuous casting billet is indirectly improved.
After primary cooling and secondary cooling are carried out on a bending section with liquid core pressure, an arc section with straightening and a horizontal section through electromagnetic braking of a crystallizer, molten steel is continuously cast to form a continuous casting billet, the continuous casting billet enters an HRM (high reduction Mill) and is rolled into an intermediate billet through the HRM; and then, ensuring the surface temperature of the intermediate blank by an IHF (induction heating furnace), simultaneously carrying out high-pressure water descaling treatment on the iron scale on the surface of the intermediate blank, feeding the intermediate blank subjected to the high-pressure water descaling treatment into a finishing mill, and rolling the intermediate blank subjected to the high-pressure water descaling into a thin hot rolled steel strip by the finishing mill. The hydraulic loop device is arranged between the finishing mill frames, so that the hot-rolled coil can be rolled under constant tension, and the rolling precision of the hot-rolled coil is ensured.
A thickness gauge and a width gauge are arranged behind the finishing mill, and the thickness gauge and the width gauge can measure and display the thickness and the width of the hot-rolled coil; meanwhile, the thickness gauge and the width gauge are matched with a control system, a roll shifting system and a roll bending system of the finishing mill, so that the longitudinal size precision of the hot-rolled coil can be improved, and the transverse thickness tolerance of the hot-rolled coiled steel can be reduced. Experiments prove that the thickness tolerance can be controlled within 5 microns by the method.
S130: and (3) a cooling stage: and carrying out laminar cooling on the thin hot rolled steel strip formed in the ESP continuous casting and rolling stage.
Specifically, the thin gauge hot rolled steel strip is fed into a run-out table, and the thin gauge hot rolled steel strip is fed into a coiler through pinch rolls of the run-out table. Wherein, the process of sending the thin hot rolled steel into the output roller way is the process of realizing laminar cooling of the thin hot rolled steel strip.
S140: and (3) a coiling stage: and coiling the thin hot rolled steel strip subjected to laminar cooling to form a reel-shaped hot rolled coil.
Wherein the thin hot rolled steel strip is wound by a coiler to form a coil-shaped hot rolled coil.
S150: acid washing stage: the rolled hot rolled coil wound at the winding stage is pickled.
S160: leveling and rewinding stage: and flattening and recoiling the hot rolled coil after acid washing to obtain the steel for the flux-cored wire.
Further, after the hot-rolled coil after acid washing is flattened and rewound to obtain the steel for the flux-cored wire, the method sequentially comprises the steps of sampling, inspecting, packaging and warehousing the steel rolled coil for the flux-cored wire.
According to the process, the thickness of the steel for the flux-cored wire rolled by the method is 0.6-1.0 mm. Experiments prove that the thinnest rolling specification which can be realized by the invention at present is 0.8mm, and the maximum width is 1600 mm. Compared with the traditional process for producing the steel for the flux-cored wire, the invention directly carries out continuous casting and rolling on the molten steel through the ESP wire, thereby avoiding secondary heating on a casting blank, and directly unloading and warehousing the product without cold rolling and annealing processes after coiling and acid pickling. The invention is therefore faster and more adaptable and also enables a higher quality of the product to be obtained.
It should be noted that, because the existing steel for flux-cored wires is produced by using cold-rolled steel strips as base materials, when the cold-rolled steel strips are produced, the steel for flux-cored wires can be obtained by sequentially carrying out the processes of pickling, cold rolling, annealing, leveling and the like on hot-rolled coils.
Specifically, the invention has the following beneficial effects:
1. because the molten steel is directly subjected to continuous casting and rolling through an ESP line, the molten steel can be cast iron when the molten steel is hot at high temperature, the high-temperature energy of a continuous casting billet is fully utilized, and a large reduction is generated by using lower rolling force, so that compared with a conventional hot continuous rolling mill, the number of heating furnaces can be reduced, and the energy consumption is greatly reduced;
2. the rolling is carried out at high temperature, so that the uniformity of microstructure of the product can be improved, and the index performance of the product is greatly improved;
3. the whole ESP line is not more than 200 meters from continuous casting to a finished product coiler, the structure is compact, and the cost investment can be reduced;
4. by using ESP line continuous casting, the full endless continuous rolling can be realized, the molten steel is directly changed into thin hot rolled coils, the product yield is high, and the cost is low. The rolled hot rolled coil can be directly used by users, and when the product specification is less than 2mm, the proportion is not less than 56%, and the maximum width is 1600mm, the hot rolled coil rolled by the invention can also replace the cold rolled product of the specification.
5. Because the rolling line of the invention is short, the production amount of the iron scale can be reduced, the pollution of dephosphorization water is reduced, the emission of greenhouse gas is reduced, and the invention is beneficial to environmental protection;
6. the product produced by the invention can cover the full-series steel types of low-carbon mild steel series, IF steel, medium-carbon series, low-alloy high-strength series, dual-phase steel, weathering steel, electrical steel, pipeline steel and the like.
The method of manufacturing a steel for an ESP wire-based flux cored wire according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the method for manufacturing steel for an ESP wire-based flux cored wire set forth in the above description without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (7)
1. A method of manufacturing steel for an ESP wire-based flux-cored wire, comprising:
a steel-making stage: the blast furnace molten iron is sequentially subjected to desulfurization, converter smelting, refining and vacuum circulating degassing to form molten steel;
ESP continuous casting and rolling stage: carrying out continuous casting and continuous rolling on the molten steel formed in the steelmaking stage based on an ESP line to form a thin hot rolled steel strip; wherein, in the ESP continuous casting and rolling stage,
controlling friction force between a crystallizer and a billet shell and temperature distribution of molten steel in the crystallizer by adopting a non-sinusoidal vibration mode and a braking duckbill type water immersion inlet, performing primary cooling and secondary cooling on the molten steel through electromagnetic braking of the crystallizer, a bending section with liquid core pressing, an arc section with straightening and a horizontal section, continuously casting the molten steel to form a continuous casting billet, rolling the continuous casting billet into an intermediate billet through a roughing mill, performing electromagnetic induction heating on the intermediate billet, performing high-pressure water descaling treatment on the intermediate billet, and rolling the intermediate billet subjected to the high-pressure water descaling treatment into a thin hot rolled steel strip through a finishing mill in a full-end mode; wherein,
the inner hole of the brake duckbill type immersion water inlet comprises two openings, and the side wall of each opening is respectively provided with a guide hole which inclines downwards;
and (3) a cooling stage: carrying out laminar cooling on the thin hot rolled steel strip formed in the ESP continuous casting and rolling stage;
and (3) a coiling stage: coiling the thin hot rolled steel strip subjected to laminar cooling to form a reel-shaped hot rolled coil;
acid washing stage: pickling the coiled hot rolled coil in the coiling stage;
leveling and rewinding stage: and flattening and recoiling the hot rolled coil after acid washing to obtain the steel for the flux-cored wire.
2. The method of manufacturing steel for an ESP-line-based flux-cored wire according to claim 1, wherein the thickness of the thin hot-rolled steel strip formed by continuously casting and rolling the molten steel formed in the steelmaking stage on the basis of the ESP line is 0.6mm to 1.0 mm.
3. The method of manufacturing steel for flux cored wire based on ESP wire according to claim 2, wherein the thickness of the thin gauge hot rolled steel strip formed by continuously casting and rolling the molten steel formed in the steel making stage based on ESP wire is 0.8 mm.
4. The method for manufacturing a steel for flux cored wire based on an ESP wire according to claim 1, wherein the sampling, inspection, packaging and warehousing of the hot-rolled coil for flux cored wire are sequentially performed after the hot-rolled coil after the pickling is flattened and rewound to obtain the steel for flux cored wire.
5. The method for manufacturing a steel for an ESP wire-based flux cored wire according to claim 1, wherein after the molten steel is continuously cast to form a continuous cast slab after primary cooling and secondary cooling by electromagnetic braking of a mold, a bending section with a liquid core pressure, and an arc section and a horizontal section with a straightening,
the continuous casting billet enters an HRM for rough rolling, and the HRM is used for rolling the continuous casting billet into an intermediate billet;
ensuring the surface temperature of the intermediate billet through IHF, and simultaneously carrying out high-pressure water descaling treatment on the iron scale on the surface of the intermediate billet;
and (3) feeding the intermediate blank subjected to high-pressure water descaling treatment into a finishing mill, and rolling the intermediate blank subjected to high-pressure water descaling into a thin hot-rolled steel strip through the finishing mill without a head.
6. The method for manufacturing a steel for an ESP-wire-based flux cored wire according to claim 1, wherein, in the laminar cooling of the thin gauge hot rolled steel strip formed in the ESP continuous casting and rolling stage,
and feeding the thin hot rolled steel strip into an output roller way, and feeding the thin hot rolled steel strip into a coiling machine through a pinch roll of the output roller way.
7. The method of manufacturing a steel for an ESP wire-based flux cored wire according to claim 6, wherein, in winding the thin hot-rolled steel strip after the laminar cooling into a roll-shaped hot-rolled coil,
and coiling the thin hot rolled steel strip by a coiler.
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| CN105665662B (en) | 2017-08-08 |
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Denomination of invention: Manufacturing method of steel for flux cored wire based on ESP wire Effective date of registration: 20211222 Granted publication date: 20170808 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2021980015819 |
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