CN107042239B - Continuous rolling continuous annealing and washing production system capable of switching multi-grade stainless steel strips on line - Google Patents
Continuous rolling continuous annealing and washing production system capable of switching multi-grade stainless steel strips on line Download PDFInfo
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- CN107042239B CN107042239B CN201710373505.6A CN201710373505A CN107042239B CN 107042239 B CN107042239 B CN 107042239B CN 201710373505 A CN201710373505 A CN 201710373505A CN 107042239 B CN107042239 B CN 107042239B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/28—Drums or other coil-holders
- B21C47/30—Drums or other coil-holders expansible or contractible
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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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
- C21D8/0236—Cold rolling
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Abstract
The invention provides a continuous rolling and continuous annealing and washing production system capable of switching multi-grade stainless steel strips on line, wherein the stainless steel strips of different grades are prepared after a raw steel coil of the multi-grade stainless steel strips enters the production system, the production system comprises an uncoiling device, a welding device, an inlet loop, a rolling mill system, a rolling mill loop, an annealing and cooling system, a mechanical descaling system, an electrolytic pickling system, a final cleaning and drying device, an outlet loop, a leveling system and a coiling device which are sequentially arranged, and the electrolytic pickling system comprises a pre-cleaning device, a sodium sulfate electrolysis device, a sulfuric acid pickling device and a mixed acid pickling device which are sequentially connected. The technical scheme of the invention realizes that the stainless steel strips with the surface grades of No.1, 2E, 2B and 2D can be produced by only one production line, and can realize the on-line rapid switching of the production of different surface grades and different materials.
Description
Technical Field
The invention relates to a stainless steel production system, in particular to a continuous rolling and continuous annealing production system for producing stainless steel strips with surface grades of No.1, 2E, 2B and 2D, and particularly relates to a continuous rolling and continuous annealing production system capable of producing stainless steel strips with multiple materials and multiple surface grades in an online switching manner.
Background
At present, stainless steel hot-rolled black strip is treated by a continuous annealing and pickling production line to obtain a product with the surface grade of NO. 1; the product with the surface grade of 2E is subjected to black skin rolling by an eighteen-roller cold rolling mill which is additionally provided with a two-stand or three-stand side supporting stress device and is hydraulic in front of a common continuous annealing and pickling production line. The downstream cold rolling process takes the strip with the surface grade NO.1 or 2E as a raw material, the strip is rolled by a cold continuous rolling mill or a single rolling mill, and the rolled semi-finished product is transferred to a cold rolling special annealing and pickling line for treatment to obtain a finished product with the surface grade of 2B or 2D. To accomplish the production of the above surface grade products, the existing process equipment is configured with the following disadvantages: the method has the advantages of long process flow, large equipment configuration, large investment, long strip circulation period, low yield, long time consumption for steel grade switching during production of different materials, shutdown, poor plate type thickness for producing 2E plate surfaces, poor flexibility of a production line for meeting market changes, high energy consumption and poor environment-friendly configuration.
Therefore, it is desirable to provide a stainless steel production system that solves the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The invention aims to provide a continuous production system which is reliable in performance, environment-friendly, low in energy consumption and guaranteed in quality and can flexibly meet the production requirements of strips made of stainless steel and made of different materials and different surface grades, so that the problems that in the prior art, the process flow is complex, the equipment configuration is multiple, the production cost is high, the circulation period of the strips is long, the yield is low, the time for changing the steel types during production of different materials is long, the machine needs to be stopped, the thickness of a plate type for producing a 2E plate surface is poor, the flexibility of a production line for dealing with market changes is not enough, the energy consumption is high, the environment-friendly configuration is poor and the like are.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a can switch production system of multi-grade stainless steel strip on line, by the raw material coil of strip of multi-grade stainless steel strip gets into behind the production system and prepare out the stainless steel strip of different grades, production system is including the unwinding unit, welding set, entry loop, rolling mill system, rolling mill loop, the cooling system that anneals, mechanical descaling system, electrolytic pickling system, export loop, level system and coiling apparatus that set gradually, electrolytic pickling system is including connecting gradually the belt cleaning device in advance that sets up, sodium sulfate electrolytic device, sulfuric acid pickling device and mixed acid pickling device.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, the rolling mill system sequentially comprises an eighteen rolling mill device, a first brushing device and a degreasing device with a drying function; wherein the eighteen rolling mill apparatus is disposed at an outlet of the inlet loop and the degreasing apparatus is disposed at an inlet of the rolling mill loop; the eighteen rolling mills used as side support stress devices are worm and gear type eighteen rolling mills.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, the mechanical descaling system comprises a scale breaker, a drying device and a shot blasting machine which are sequentially connected; wherein the scale breaker is arranged at an outlet of the annealing cooling system, and the shot blasting machine is arranged at an inlet of the electrolytic pickling system; the scale breaker is a wet scale breaker, a lower scale breaking roller of the wet scale breaker is fixed and has no adjusting mechanism, a working roller and a supporting roller are processed by adopting a material GCr15, and the hardening depth can reach 4-5 mm.
In the above production system capable of switching multi-grade stainless steel strip online, preferably, the uncoiling device is a large-stroke expansion and contraction uncoiler with a paper-packing recovery function; the welding device is a laser welding machine with a laser cutting function; a final cleaning and drying device is also arranged between the electrolytic pickling system and the outlet loop; the leveling system comprises a leveling machine, a leveling small loop and a detection table which are sequentially connected; the winding device is provided with a backing paper adding function.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, a second brushing device, a third brushing device and a fourth brushing device are respectively arranged at the outlets of the sodium sulfate electrolysis device, the sulfuric acid pickling device and the mixed acid pickling device; wherein the pre-cleaning device is arranged at an outlet of the mechanical descaling system, and the fourth brushing device is arranged at an inlet of the outlet loop.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, the sodium sulfate electrolysis device consists of a sodium sulfate electrolysis tank, a sodium sulfate circulation tank and a sodium sulfate regeneration device which are connected in sequence; wherein the second brushing device is arranged at the outlet of the sodium sulfate electrolytic cell; circulating electrolyte enters the sodium sulfate regeneration device from the sodium sulfate circulation tank, the regeneration liquid produced by the sodium sulfate regeneration device flows back to the sodium sulfate circulation tank, crystals produced by the sodium sulfate regeneration device are transported to a sintering process for recovery processing, and the electrolyte circulating between the sodium sulfate circulation tank and the sodium sulfate electrolytic tank is circularly flowing sodium sulfate, so that the stainless steel strip can be conveniently electrolytically cleaned.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, the sulfuric acid pickling device comprises a sulfuric acid pickling tank, a sulfuric acid circulating tank and an on-line filtering device which are sequentially connected; wherein the third brushing device is arranged at an outlet of the sulfuric acid pickling tank; the online filtering device is a solid-liquid separation device; the sulphuric acid circulating solution follow get into in the sulphuric acid circulating tank among the solid-liquid separation equipment, the warp the filtrating backward flow that solid-liquid separation equipment separated extremely in the sulphuric acid circulating tank, the warp the filter cake that solid-liquid separation equipment separated is transported to the sintering process and is carried out recovery processing, sulphuric acid circulating tank with the circulating solution between the sulphuric acid pickling tank is circulating flow's sulphuric acid, is convenient for right the chemical cleaning of stainless steel strip.
In the above production system capable of switching multi-grade stainless steel strips on line, preferably, the mixed acid pickling device comprises a mixed acid pickling tank, a mixed acid circulating tank and an on-line filtering device which are connected in sequence; wherein the fourth brushing device is arranged at the outlet of the mixed acid pickling tank; the online filtering device is a solid-liquid separation device; the mixed acid circulating liquid enters the solid-liquid separation device from the mixed acid circulating tank, filtrate separated by the solid-liquid separation device flows back to the mixed acid circulating tank, filter cakes separated by the solid-liquid separation device are transferred to a sintering process for recovery treatment, and the circulating liquid between the mixed acid circulating tank and the mixed acid pickling tank is mixed acid flowing circularly, so that the stainless steel strip is cleaned chemically.
In the production system for on-line switching of multi-grade stainless steel strip as described above, preferably, the production system further comprises: the system comprises a waste mixed acid tank, a waste mixed acid regeneration system and a regenerated acid tank; waste mixed acid enters the waste mixed acid tank from the mixed acid circulating tank and is conveyed to the waste mixed acid regeneration system through a pipeline, regenerated acid produced by the waste mixed acid regeneration system is conveyed to the regenerated acid tank and is added into the mixed acid circulating tank according to process requirements, and iron powder produced by the waste mixed acid regeneration system is collected and transferred to a sintering process for recycling treatment.
In the production system capable of switching multi-grade stainless steel strips on line, preferably, each acid mixing section is provided with two circulating tanks, two sets of heat exchangers and two sets of pipeline systems which are connected with the acid tank, so that the steel grades can be switched quickly.
In the production system for on-line switchable multi-grade stainless steel strip as described above, preferably, the multi-grade stainless steel strip is a finished stainless steel product with a surface grade of No.1, 2B, 2D or 2E.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. the technical scheme of the invention realizes that the stainless steel strips with the surface grades of No.1, 2E, 2B and 2D can be produced by only one production line, and can realize the on-line rapid switching of the production of different surface grades and different materials.
2. The invention adopts a large-stroke expansion-contraction uncoiler (with the function of recovering packing paper) without additionally arranging a diameter-increasing sleeve or a diameter-increasing block, has stronger applicability to the fluctuation of the inner diameter of hot-rolled black skin supplied materials compared with a common uncoiler, and does not need to disassemble the diameter-increasing sleeve or the diameter-increasing block when producing return coils.
3. The invention adopts laser cutting and laser welding technology, the laser source adopts solid disc type, the steel band is cut end to end and is configured with laser cutting, and the welding line is inclined to a certain angle with the transverse central line of the machine set.
4. The invention adopts the eighteen-roller rolling mill with the side supporting stress device arranged as a worm gear type three-frame, and the side supporting stress of the eighteen-roller rolling mill can resist 100 tons. Compared with other continuous rolling mills, the technical scheme of the invention can be suitable for the production of multi-surface grades, the plate profile is better, the tolerance is smaller, the maximum rollable thickness of 1550mm wide by 8.0mm, the maximum rolling reduction of black skin can reach 50%, the maximum rolling reduction of white skin can reach 60%, and the online roll change without rolling stop can be realized.
5. The invention is designed with two sets of emulsion systems, different emulsions and different configuration concentrations can be selected according to different plate surface grade requirements, and magnetic filtration and vacuum filtration are combined for filtration.
6. The brushing device is arranged at the outlet of the rolling mill, bristles made of different materials can be switched according to different surface grade requirements, dirty dirt or loose oxide skin on the surface of the plate can be effectively removed, convenience is provided for subsequent surface treatment, and flushing water is saved.
7. The wet scale breaker is adopted, so that the iron scale dust is effectively inhibited, and the scratches on the surface of the strip steel can be reduced to a certain extent. The structure adopts the fixed type lower scale breaking roller, no adjusting mechanism is adopted, the operation is convenient, and the field maintenance amount is small; the working roll and the supporting roll are processed by adopting a material GCr15, the hardening depth can reach 4-5 mm, and the working roll and the supporting roll are allowed to be repeatedly ground for multiple times.
8. The invention adopts the sodium sulfate electrolysis device and the sulfuric acid pickling device which are simultaneously arranged, can realize the electrolysis by adding sodium sulfate when producing 2B and 2D surfaces, and the sulfuric acid pickling when producing NO.1 or 2E surfaces, and can also simultaneously add the defect of the thickness of the oxidized scale used as the raw material for processing the black scale.
According to the invention, the solid-liquid separation technology is adopted to carry out online filtration on the acid liquor in the acid circulation tank, so that the accumulation of precipitates can be greatly reduced, the activity of the acid liquor can be improved, the acid washing operation period can be prolonged, the acid liquor discharge can be reduced, the water content of a formed filter cake is low, and the recovery and utilization of a sintering process can be facilitated; meanwhile, the technology is used as pretreatment of the waste mixed acid spray roasting regeneration technology, and the risk of wall agglomeration of the roasting furnace is greatly reduced.
The invention realizes the regeneration of nitric acid and hydrofluoric acid in the waste mixed acid by using the waste mixed acid spray roasting regeneration technology, recovers metal ions in the waste mixed acid in the form of oxide (powder), greatly reduces the acid consumption, lightens the neutralization treatment load, is beneficial to the recovery of noble metals, and has remarkable economic benefit.
The invention adopts a selective catalytic reduction method to treat the mixed acid waste gas, the core catalyst adopts an environment-friendly rare earth type low-temperature catalyst, the reducing agent adopts ammonia water, compared with the common vanadium-titanium catalyst and the reducing agent which adopt urea solution, the energy consumption is low, the surface of the catalyst is not easy to have urea crystallization or dust deposition, the catalytic effect is stable, the service life is long, and the catalyst is non-dangerous waste after being scrapped.
The mixed acid pickling device adopted by the invention has two sets of independent acid circulating tank systems, and can realize the online quick switching of different steel grades.
9. The rolling reduction rate of the temper mill provided by the invention can reach 10%, the requirement of a 2B/2D plate surface is met, and meanwhile, the roughness of a NO.1 plate surface can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic diagram of a continuous rolling continuous annealing and washing production system capable of producing stainless steel multi-material multi-surface grade strips in an on-line switching manner according to an embodiment of the present invention;
FIG. 2 is a schematic view of the rolling mill system of FIG. 1;
FIG. 3 is a schematic view of the annealing cooling system of FIG. 1;
FIG. 4 is a schematic view of the mechanical descaling system of FIG. 1;
FIG. 5 is a schematic diagram of the electrolytic pickling system of FIG. 1;
FIG. 6 is a schematic view of the planarization system of FIG. 1.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1-6, the present invention provides a production system capable of switching multi-grade stainless steel strips on line, wherein the stainless steel strips of different grades are prepared after raw steel coils of the multi-grade stainless steel strips enter the production system, the production system comprises an uncoiling device, a welding device, an inlet loop, a rolling mill system, a rolling mill loop, an annealing cooling system, a mechanical descaling system, an electrolytic pickling system, an outlet loop, a leveling system and a coiling device which are sequentially arranged, and the electrolytic pickling system comprises a pre-cleaning device, a sodium sulfate electrolysis device, a sulfuric acid pickling device and a mixed acid pickling device which are sequentially connected.
In the embodiment of the invention, the stainless steel strips with different grades are stainless steel finished products with the surface grades of NO.1, 2B, 2D or 2E. The invention can realize that the stainless steel strips with the surface grades of 1, 2E, 2B and 2D can be produced by only one production line, and can realize the on-line switching production of different surface grades and different materials.
In the embodiment of the invention, the rolling mill system sequentially consists of an eighteen rolling mill device, a first brushing device and a degreasing device with a drying function; wherein, eighteen rolling mill devices are arranged at the outlet of the inlet loop, and the degreasing device is arranged at the inlet of the rolling mill loop.
In the embodiment of the present invention, the eighteen rolling mill device used as the side support force receiving device is a worm and gear type eighteen-high rolling mill. The invention adopts a side support stress device as a worm gear and worm type eighteen-roller mill, the side support stress of the side support stress device can resist 100 tons, and the side support stress device adopts a three-frame arrangement. Compared with other continuous rolling mills (such as a hydraulic cylinder type eighteen-roller rolling mill), the technical scheme can be suitable for production of multiple surface grades, the produced plate type is better, the tolerance is smaller, the maximum rollable thickness of 1550mm × 8.0mm can be achieved, the maximum rolling reduction of the black skin can reach 50%, the maximum rolling reduction of the white skin can reach 60%, and online roll changing can be achieved without rolling stop.
In the embodiment of the invention, the first brushing device is arranged at the outlet position of the side support rolling mill device, and bristles made of different materials can be switched according to different surface grade requirements, so that dirty dirt or loose oxide skin on the plate surface can be effectively removed, convenience is provided for subsequent surface treatment, and flushing water is saved. Preferably, the bristles of the first brushing device may be PPH or silicon carbide.
The invention is designed with two sets of emulsion systems, different emulsions and different configuration concentrations can be selected according to different plate surface grade requirements, and magnetic filtration and vacuum filtration are combined for filtration.
In the embodiment of the invention, the mechanical descaling system comprises a descaling machine, a drying device and a shot blasting machine which are sequentially connected; the scale breaking machine is arranged at an outlet of the annealing cooling system, and the shot blasting machine is arranged at an inlet of the electrolytic pickling system; the scale breaker is a wet scale breaker, a lower scale breaking roller of the wet scale breaker is fixed and has no adjusting mechanism, a working roller and a supporting roller are processed by adopting a material GCr15, and the hardening depth can reach 4-5 mm.
Factors considered by the model selection of the wet scale breaker of the invention are as follows:
1) aiming at the adverse effect of a dry scale breaker on the surrounding environment, the wet scale breaker is adopted, and three paths of spray water are respectively adopted aiming at the surface of the scale breaking roller, the surface of the strip steel and the equipment groove body, so that the iron scale dust is effectively inhibited, and the scratch on the surface of the strip steel can be reduced to a certain degree.
2) The lower scale breaking roller is of a fixed structure, and an adjusting mechanism is not arranged, so that the service life of the equipment is greatly prolonged for a spraying water environment.
3) Aiming at the problem of short service life of a working roll of a wet-type scale breaker, the bearing seal of the working roll support roll is specially designed, so that the working roll and the support roll bearing can be fully lubricated in a severe environment of iron scale and muddy water mixing, the replacement caused by the bearing problem can be avoided in the working period of the working roll support roll, the service life of the working roll of the dry-type scale breaker is prolonged, and the working environment of the scale breaker is improved.
4) The working roll and the supporting roll are processed by adopting a material GCr15, the hardening depth can reach 4-5 mm, and the repeated use of the grinding roll of the working roll and the supporting roll is allowed.
In the embodiment of the invention, the uncoiling device is a large-stroke expansion and contraction uncoiler with a function of recovering packing paper; the welding device is a laser welding machine with a laser cutting function; a final cleaning and drying device is also arranged between the electrolytic pickling system and the outlet loop; the leveling system comprises a leveling machine, a leveling small loop and a detection table which are sequentially connected; the winding device is a winding device having a paper-padding function.
In the embodiment of the invention, the uncoiling device is a large-stroke expansion and contraction uncoiler (with the function of selectively disassembling the packing paper), no additional diameter-increasing sleeve or diameter-increasing block is needed, the uncoiling device has stronger applicability to the fluctuation of the inner diameter of hot-rolled black skin incoming materials compared with a common uncoiler, the diameter-increasing sleeve or the diameter-increasing block is not needed to be disassembled when the return coil is produced, and the packing paper can be detachably recovered.
In the embodiment of the invention, the welding device is a laser welding machine with a laser cutting function; a laser source of the laser welding machine is of a solid disc type, laser cutting is configured at the head and tail cutting positions of the stainless steel strip, and a certain angle is formed between a welding line and the transverse center line of the machine set in a deviation mode. Compared with an argon arc welding machine or a common laser welding machine, the technical scheme can solve the problems of difficult shearing of a thick plate and blade opening breakage, ensures the welding quality, has flat and smooth welding seams, meets the rolling requirement on physical performance, does not need to lift a roller (temporarily suspend rolling) to pass the welding seams, can directly roll the welding seams without reducing the rolling force or the front and back tension, can lead the welding seams to spirally contact with a working roller when rolling due to inclined angles of the welding seams, greatly reduces the risk of broken welding seams, is suitable for the welding seam rolling with multi-material multi-surface grade requirements, and greatly improves the yield of various products.
In the embodiment of the invention, the annealing cooling system consists of the annealing furnace and a three-stage cooling system, and the three-stage cooling system is arranged at the outlet of the annealing furnace. The three-stage cooling system consists of an air cooling device, a fog cooling device and a water cooling device which are sequentially connected. The annealing furnace is arranged at the outlet of the rolling mill loop, and the water cooling device is arranged at the inlet of the mechanical descaling system.
In the embodiment of the invention, a second brushing device, a third brushing device and a fourth brushing device are respectively arranged at the outlets of the sodium sulfate electrolysis device, the sulfuric acid pickling device and the mixed acid pickling device; wherein, the pre-cleaning device is arranged at the outlet of the mechanical descaling system, and the fourth brushing device is arranged at the inlet of the outlet loop.
In the embodiment of the invention, the sodium sulfate electrolysis device consists of a sodium sulfate electrolysis tank, a sodium sulfate circulation tank and a sodium sulfate regeneration device which are connected in sequence; wherein, the second brushing device is arranged at the outlet of the sodium sulfate electrolytic cell; circulating electrolyte enters the sodium sulfate regeneration device from the sodium sulfate circulation tank, the regeneration liquid produced by the sodium sulfate regeneration device flows back to the sodium sulfate circulation tank, crystals produced by the sodium sulfate regeneration device are transferred to a sintering process for recovery processing, and the electrolyte circulating between the sodium sulfate circulation tank and the sodium sulfate electrolytic tank is circulating sodium sulfate, so that the stainless steel strip can be conveniently electrolyzed and cleaned.
In the embodiment of the invention, the sulfuric acid pickling device comprises a sulfuric acid pickling tank, a sulfuric acid circulating tank and an online filtering device which are sequentially connected; wherein, the third brushing device is arranged at the outlet of the sulfuric acid pickling tank; the online filtering device is a solid-liquid separation device; and the sulfuric acid circulating liquid enters the solid-liquid separation device from the sulfuric acid circulating tank, filtrate separated by the solid-liquid separation device flows back to the sulfuric acid circulating tank, a filter cake separated by the solid-liquid separation device is transported to a sintering process for recovery treatment, and the circulating liquid between the sulfuric acid circulating tank and the sulfuric acid pickling tank is sulfuric acid which circularly flows, so that the stainless steel strip can be chemically cleaned conveniently.
In the embodiment of the invention, the mixed acid pickling device comprises a mixed acid pickling tank, a mixed acid circulating tank and an online filtering device which are sequentially connected; wherein, the fourth brushing device is arranged at the outlet of the mixed acid pickling tank; the online filtering device is a solid-liquid separation device; and the mixed acid circulating liquid enters the solid-liquid separation device from the mixed acid circulating tank, filtrate separated by the solid-liquid separation device flows back to the mixed acid circulating tank, filter cakes separated by the solid-liquid separation device are transported to a sintering process for recovery treatment, and the circulating liquid between the mixed acid circulating tank and the mixed acid pickling tank is mixed acid which circularly flows, so that the stainless steel strip can be chemically cleaned conveniently. Preferably, the mixed acid is a mixed solution of nitric acid and hydrofluoric acid.
In the embodiment of the invention, the sodium sulfate electrolysis device and the sulfuric acid pickling device are arranged at the same time, so that the electrolysis by sodium sulfate can be realized when the surfaces of 2B and 2D are produced, the sulfuric acid pickling can be realized when the surfaces of NO.1 or 2E are produced, and the defect of the thickness of the oxide scale of the black scale serving as a processing raw material can also be used at the same time.
In the embodiment of the present invention, it is further preferable that: the system comprises a waste mixed acid tank, a waste mixed acid regeneration system and a regenerated acid tank; and the waste mixed acid enters the waste mixed acid tank from the mixed acid circulating tank and is conveyed to the waste mixed acid regeneration system through a pipeline, the regenerated acid produced by the waste mixed acid regeneration system is conveyed to the regenerated acid tank and is replenished into the mixed acid circulating tank according to the process requirement, and the iron powder produced by the waste mixed acid regeneration system is collected and transferred to a sintering process for recycling treatment.
In the embodiment of the invention, the acid liquor in the acid circulating tank is filtered on line by adopting solid-liquid separation (solid-liquid two-stage separation technology), so that the accumulation of precipitates can be greatly reduced, the activity of the acid liquor can be improved, the acid washing operation period can be prolonged, the discharge of the acid liquor can be reduced, the water content of a formed filter cake is low, and the recovery and the utilization of a sintering process can be facilitated; meanwhile, the technology is used as pretreatment of the waste mixed acid spray roasting regeneration technology, and the risk of wall agglomeration of the roasting furnace is greatly reduced.
In the embodiment of the invention, the regeneration of nitric acid and hydrofluoric acid in the waste mixed acid is realized by using the waste mixed acid spray roasting regeneration technology, and the metal ions in the waste mixed acid are recovered in the form of oxide (powder), so that the acid consumption is greatly reduced, the load of neutralization treatment is reduced, and the recovery of precious metals is facilitated.
Preferably, each acid mixing section is provided with two circulating tanks, two sets of heat exchangers and two sets of pipeline systems which are connected with the acid tank, so that the steel grade can be rapidly switched. In the embodiment of the invention, the designed mixed acid pickling device is provided with two independent acid circulating tank systems, and online quick switching of different steel types can be realized.
In the embodiment of the invention, the SCR denitration technology is adopted to treat the mixed acid waste gas, the core catalyst adopts an environment-friendly rare earth type low-temperature catalyst, the reducing agent adopts ammonia water, and compared with the common vanadium-titanium catalyst and the reducing agent which adopt urea solution, the energy consumption is low, the urea crystal or dust deposition is not easy to occur on the surface of the catalyst, the catalytic effect is stable, the service life is long, and the waste gas is non-dangerous waste after being scrapped.
In the embodiment of the invention, the inlet loop, the rolling mill loop, the outlet loop and the small loop of the temper mill are preferably horizontal loops.
In the embodiment of the invention, a drying device is also arranged between the electrolytic pickling system and the outlet loop; the leveling system comprises a leveling machine, a leveling small loop and a detection platform which are sequentially connected. The planisher is a two-roller or four-roller planisher. Preferably, the temper mill is a four-roller temper mill, the reduction rate can reach 10%, the requirement of a 2B/2D plate surface is met, and meanwhile the roughness of a NO.1 plate surface can be improved.
In order to more specifically understand the production system of the embodiment of the present invention, the following will describe the operation method of the production system of the present invention in detail, and the specific contents are as follows:
the raw materials of the production system can be selected according to the surface grade requirements of finished products, and if the finished products are NO.1 or 2E surfaces, the raw materials are hot-rolled black skins; if the finished product is 2B, 2D surface, the raw material is required to be NO.1 surface.
The raw material steel coil enters a production line through an uncoiling device, and high-precision laser welding is carried out on the tail of the front coil and the head of the rear coil after high-precision shearing with deflection angles is carried out through laser cutting.
The strip steel enters the continuous rolling mill through the inlet loop, and whether the strip steel is rolled or not is selected according to the requirements of surface grade. When the NO.1 surface grade is produced, the rolling mill is not put into use; when the surface grades of 2E, 2B and 2D are produced, the materials are all put into a rolling mill and are selected to be pressed and distributed according to the thickness requirement, the maximum rollable thickness of 1550mm wide 8.0mm is achieved, the maximum rolling reduction rate of black skins can reach 50%, the maximum rolling reduction rate of white skins can reach 60%, and online roll changing without rolling stop can be achieved. It should be noted that: the system is designed with two emulsion systems, which are respectively suitable for 2E and 2B/2D surface grades.
After the strip steel is discharged from the continuous rolling mill, the strip steel enters a first brushing device, and after dirt or loose oxide skin on the surface of the strip steel is removed, the strip steel enters a degreasing device (with drying). It should be noted that when the tandem mill is not put into use, the degreasing device is only put into use with the drying function, and the degreasing function is not put into use.
The strip steel is discharged from the degreasing device, enters a rolling mill loop, enters an annealing furnace, is subjected to solid solution treatment in the annealing furnace, and is discharged from the annealing furnace, and three-stage cooling, namely air cooling, fog cooling and water cooling, is adopted.
After the strip steel is discharged from the cooling section of the annealing furnace, part of water on the surface of the strip steel is squeezed off by a squeezing roller and then enters a wet-type scale breaker. And (3) performing two-bending and one-straightening under the condition of water spraying, so that an oxide layer on the strip steel is broken and falls under bending stress and tensile stress, and the spraying water carries away iron powder and performs solid-liquid separation to recover the iron powder and the spraying water for recycling.
The strip steel enters the shot blasting machine after coming out of the scale breaker and entering the drying device for drying the surface, and the following points are pointed out: when the produced finished product is NO.1/2E, the shot blasting machine needs to be put into use, and when the produced finished product is 2B/2D, the shot blasting machine does not need to be put into use.
The strip steel enters a pre-cleaning device to remove residual grinding materials (shot blasting materials) on the surface after being discharged from the shot blasting machine, and then sequentially passes through a sodium sulfate electrolytic tank, a second brushing device, a sulfuric acid pickling tank, a third brushing device, a mixed acid pickling tank and a fourth brushing device. Each groove is provided with a corresponding circulating tank, a sodium sulfate regeneration device is arranged in each groove, and the filtered crystals are sent to a sintering process for recycling. The sulfuric acid circulating tank and the mixed acid circulating tank are provided with online filtering devices, so that circulating liquid can be taken out from the circulating tank and enters the solid-liquid separation device, filtrate is left in the circulating tank, and filtered filter cakes are transferred to a sintering process for recycling. And the waste mixed acid enters a waste acid tank and then is sent to a waste mixed acid regeneration system for treatment, the recovery rate of nitric acid is 40-50%, the recovery rate of hydrofluoric acid is more than 98%, the formed regenerated acid is sent to a regenerated acid tank and is added into a mixed acid circulation tank for use according to the process requirements, and the formed iron powder (metal oxides such as chromium, nickel, iron and the like) is sent to a sintering process for recycling. It should be noted that: 1) when the produced finished product is NO.1/2E, only sulfuric acid pickling is generally used, and sodium sulfate electrolysis is not needed, and sodium sulfate electrolysis can be added when the oxide scale of the raw material is thicker; however, when the finished product is 2B/2D, only sodium sulfate can be used for electrolysis to ensure the surface grade, and sulfuric acid pickling cannot be used. 2) Each acid mixing tank is provided with two sets of circulating systems (a mixed acid circulating tank, a heat exchanger, a pump and the like), one set is used for producing 300 series acid, the other set is used for producing 200 series acid, and online concentration switching can be realized according to raw material materials. 3) The mixed acid pickling tanks and the circulating systems matched with the mixed acid pickling tanks are multiple, and the application quantity and concentration are selected according to the plate surface condition and the strip passing speed.
The strip steel enters a drying device to dry the surface of the plate after being scrubbed and finally cleaned, then sequentially enters an outlet loop, a leveling machine, a small leveling loop and a detection table, and finally is coiled into a steel coil through a coiling device. It should be noted that: 1) the planisher can adopt two rollers or four rollers according to the requirements, and when the finished product is NO.1/2E, the planisher is not used generally; when the finished product is 2B/2D, it is necessary to apply and adjust the reduction rate according to the surface grade. 2) When the finished product is 2B/2D, the packing paper function attached to the coiling device needs to be used.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A production system capable of switching multi-grade stainless steel strips on line is characterized in that a raw steel coil of the multi-grade stainless steel strips enters the production system to prepare stainless steel strips of different grades, and the production system comprises an uncoiling device, a welding device, an inlet loop, a rolling mill system, a rolling mill loop, an annealing cooling system, a mechanical descaling system, an electrolytic pickling system, an outlet loop, a leveling system and a coiling device which are sequentially arranged;
a second brushing device, a third brushing device and a fourth brushing device are respectively arranged at the outlets of the sodium sulfate electrolysis device, the sulfuric acid pickling device and the mixed acid pickling device;
the sulfuric acid pickling device comprises a sulfuric acid pickling tank, a sulfuric acid circulating tank and an online filtering device which are sequentially connected;
wherein the third brushing device is arranged at an outlet of the sulfuric acid pickling tank;
the online filtering device is a solid-liquid separation device; the sulfuric acid circulating liquid enters the solid-liquid separation device from the sulfuric acid circulating tank, filtrate separated by the solid-liquid separation device flows back to the sulfuric acid circulating tank, filter cakes separated by the solid-liquid separation device are transported to a sintering process for recovery treatment, and the circulating liquid between the sulfuric acid circulating tank and the sulfuric acid pickling tank is sulfuric acid which circularly flows, so that the stainless steel strip can be chemically cleaned conveniently;
the mechanical descaling system comprises a descaling machine, a drying device and a shot blasting machine which are sequentially connected; wherein the scale breaker is arranged at an outlet of the annealing cooling system, and the shot blasting machine is arranged at an inlet of the electrolytic pickling system; the scale breaker is a wet-type scale breaker; the scale breaker adopts three paths of spray water respectively aiming at the surface of the scale breaking roller, the surface of the strip steel and the equipment tank body;
the rolling mill system sequentially comprises an eighteen rolling mill device, a first brushing device and a degreasing device with a drying function;
wherein the eighteen rolling mill apparatus is disposed at an outlet of the inlet loop and the degreasing apparatus is disposed at an inlet of the rolling mill loop; the eighteen rolling mills serving as side supporting stress devices are worm and gear type eighteen-roller continuous rolling mills;
the lower scale breaking roller of the wet scale breaker is fixed and has no adjusting mechanism, the working roller and the supporting roller are processed by adopting a material GCr15, and the hardening depth reaches 4-5 mm;
the multi-grade stainless steel strip is a finished stainless steel product with the surface grade of NO.1, 2B, 2D or 2E;
the uncoiling device is a large-stroke expansion and contraction uncoiler with a paper cushion recovery function; the welding device is a laser welding machine with a laser cutting function;
a final cleaning and drying device is also arranged between the electrolytic pickling system and the outlet loop;
the leveling system comprises a leveling machine, a leveling small loop and a detection table which are sequentially connected;
the winding device is provided with a backing paper adding function.
2. The system for on-line switchable multi-grade stainless steel strip production of claim 1 wherein the pre-cleaning device is located at the outlet of the mechanical descaling system and the fourth brushing device is located at the inlet of the outlet loop.
3. The system for producing on-line switchable multi-grade stainless steel strip according to claim 2, wherein the sodium sulfate electrolysis device is composed of a sodium sulfate electrolysis tank, a sodium sulfate circulation tank and a sodium sulfate regeneration device which are connected in sequence;
wherein the second brushing device is arranged at the outlet of the sodium sulfate electrolytic cell;
circulating electrolyte enters the sodium sulfate regeneration device from the sodium sulfate circulation tank, the regeneration liquid produced by the sodium sulfate regeneration device flows back to the sodium sulfate circulation tank, crystals produced by the sodium sulfate regeneration device are transported to a sintering process for recovery processing, and the electrolyte circulating between the sodium sulfate circulation tank and the sodium sulfate electrolytic tank is circularly flowing sodium sulfate, so that the stainless steel strip can be conveniently electrolytically cleaned.
4. The production system capable of switching the multi-grade stainless steel strip on line according to claim 2, wherein the mixed acid pickling device comprises a mixed acid pickling tank, a mixed acid circulating tank and an on-line filtering device which are sequentially connected;
wherein the fourth brushing device is arranged at the outlet of the mixed acid pickling tank;
the online filtering device is a solid-liquid separation device; the mixed acid circulating liquid enters the solid-liquid separation device from the mixed acid circulating tank, filtrate separated by the solid-liquid separation device flows back to the mixed acid circulating tank, filter cakes separated by the solid-liquid separation device are transferred to a sintering process for recovery treatment, and the circulating liquid between the mixed acid circulating tank and the mixed acid pickling tank is mixed acid flowing circularly, so that the stainless steel strip is cleaned chemically.
5. The system for on-line switchable multi-grade stainless steel strip production of claim 4 further comprising: the system comprises a waste mixed acid tank, a waste mixed acid regeneration system and a regenerated acid tank;
waste mixed acid enters the waste mixed acid tank from the mixed acid circulating tank and is conveyed to the waste mixed acid regeneration system through a pipeline, regenerated acid produced by the waste mixed acid regeneration system is conveyed to the regenerated acid tank and is added into the mixed acid circulating tank according to process requirements, and iron powder produced by the waste mixed acid regeneration system is collected and transferred to a sintering process for recycling treatment.
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| EP3403736A1 (en) * | 2017-05-17 | 2018-11-21 | Primetals Technologies Austria GmbH | Guidance of metallic strips in a strip processing system |
| CN108085704B (en) * | 2017-11-01 | 2020-07-10 | 海盐哈特惠机械五金制品有限公司 | Wire acid pickling process |
| CN107962074A (en) * | 2017-12-04 | 2018-04-27 | 中冶南方工程技术有限公司 | A kind of stainless steel cold-rolled plate continuous process system and method |
| CN111390570B (en) * | 2020-03-31 | 2021-07-06 | 日照宝华新材料有限公司 | Method for mutual conversion between acid pickling coil and hot rolling leveling on acid leveling line |
| CN112642877A (en) * | 2020-08-12 | 2021-04-13 | 杨勇 | One-step production process for stainless steel products from hot-rolled black skin to cold-rolled 2B or 2D plate surface |
| CN113201741B (en) * | 2021-05-06 | 2022-11-15 | 东风汽车车轮随州有限公司 | Bright aluminum alloy wheel acid pickling mixed flow production process |
| CN115287669B (en) * | 2022-07-12 | 2023-09-19 | 中冶南方工程技术有限公司 | Multifunctional strip processing unit and application method thereof |
| CN115318869A (en) * | 2022-07-12 | 2022-11-11 | 中冶南方工程技术有限公司 | Strip processing production line containing secondary rolling process and strip processing method |
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