CN110629148A - Combined unit for continuously descaling and hot galvanizing hot rolled steel strip and production method thereof - Google Patents
Combined unit for continuously descaling and hot galvanizing hot rolled steel strip and production method thereof Download PDFInfo
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- CN110629148A CN110629148A CN201911114175.4A CN201911114175A CN110629148A CN 110629148 A CN110629148 A CN 110629148A CN 201911114175 A CN201911114175 A CN 201911114175A CN 110629148 A CN110629148 A CN 110629148A
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- descaling
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- rolled steel
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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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention belongs to the field of deep processing of steel strips, and relates to a combined unit for continuously descaling and hot galvanizing a hot rolled steel strip and a production method thereof, wherein the combined unit comprises an inlet section, an inlet loop, a descaling section, a first steering roller, an annealing section, a zinc pot, an air knife, a cooling section after plating, a fourth steering roller, a finishing section, a straightening section, a passivation section, an outlet loop and an outlet section which are sequentially arranged; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller. When hot rolling descaling products are produced, the unit only runs at an inlet section, an inlet loop, a descaling section, a steering roll, a finishing straightening and pulling section and an outlet section; when the hot-rolled descaling galvanized product is produced, the units operate except for the steering roll. The invention combines descaling and hot galvanizing, adopts a continuous production mode, has simpler process flow, and simultaneously has no discharge of pollutants such as waste water, waste gas and the like in the descaling treatment process, so that the technical method has better environmental protection compatibility.
Description
Technical Field
The invention belongs to the field of deep processing of steel strips, and relates to a combined unit for continuously descaling and hot galvanizing a hot rolled steel strip and a production method thereof.
Background
The hot-rolled galvanized sheet is directly galvanized after acid washing by taking a hot-rolled sheet as a substrate, has obvious price advantage due to the fact that the cold rolling process is omitted compared with the traditional galvanized sheet, and is widely applied to the industries of building, automobile manufacturing, steel plate warehouse manufacturing, railway passenger train manufacturing, highway guardrail plates, manufacturing and the like.
The current hot-rolled galvanized sheet production has the following defects: 1) acid washing and galvanization are independent production, the unit occupies large area and has more personnel, and simultaneously, steel coils also need to be transferred among different units and are repeatedly coiled and uncoiled; 2) acid-containing wastewater and waste gas are generated in the acid washing process, so that the environment is polluted; 3) after the steel coil is acid-washed, in order to prevent rusting, the surface of the steel coil needs to be protected by oiling, and before the steel coil is hot-galvanized, oil stains on the surface of the steel coil need to be removed by chemical cleaning or open fire heating (NOF method), so that the process is complicated and the production cost is increased; 4) chemical cleaning usually adopts combined multi-stage cleaning of alkali immersion cleaning, alkali scrubbing, electrolytic cleaning, water scrubbing and water rinsing, the process is complex, the equipment is huge, alkali-containing wastewater is generated, and the investment and operation cost are increased; 5) residual particles are generated after oil stains on the surface of the steel strip by the NOF method are combusted, and enter an annealing furnace to cause furnace roller burl and enter a zinc pot to cause zinc liquid pollution and zinc layer defects.
Disclosure of Invention
In view of the above, the present invention aims to provide a combined unit for continuously descaling and hot galvanizing a hot rolled steel strip and a production method thereof, so as to realize continuous descaling and galvanizing production.
In order to achieve the purpose, the invention provides the following technical scheme:
a hot rolled steel strip continuous descaling and hot galvanizing combined unit comprises an inlet section, an inlet loop, a descaling section, a first steering roller, an annealing section, a zinc pot, an air knife, a cooling section after plating, a fourth steering roller, a finishing section, a straightening and withdrawal section, a passivation section, an outlet loop and an outlet section which are sequentially arranged; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller.
Optionally, the annealing section is a horizontal furnace or a vertical furnace, and the heating temperature of the steel strip in the annealing section is 450-480 ℃.
Optionally, the finishing section employs one of a 2-roll finishing machine, a 4-roll finishing machine, and a 6-roll finishing machine.
Optionally, the descaling section is descaled by using a shot blasting machine, an abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate by using the shot blasting machine to remove an oxide layer.
A production process for continuously descaling and hot galvanizing a hot rolled steel strip adopts the combined unit for continuously descaling and hot galvanizing the hot rolled steel strip; the production process comprises a hot rolled steel strip continuous descaling production process and a hot rolled steel strip continuous descaling galvanizing production process;
in the continuous descaling production process of the hot-rolled steel strip, the hot-rolled steel strip enters a descaling section from an inlet section through an inlet loop to be descaled; the steel strip after descaling passes through a first turning roll, a second turning roll, a third turning roll and a fourth turning roll, and then enters a finishing section and a pulling and straightening section for finishing and pulling and straightening treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip passes through a passivation section and an outlet loop and is output from an outlet section, and the production of the hot-rolled descaling steel strip is finished; in the production process, the steel strip only passes through the passivation section, and equipment of the passivation section does not participate in actual production operation;
in the continuous descaling and galvanizing production process of the hot rolled steel strip, the hot rolled steel strip enters a descaling section from an inlet section through an inlet loop to be descaled; the steel strip after descaling enters an annealing section through a first steering roller, the steel strip is heated to a certain temperature and then enters a zinc pot for galvanizing, and after the steel strip is galvanized, the steel strip is blown by an air knife and then enters a post-galvanizing cooling section to be cooled to room temperature; then the steel strip enters a finishing section and a withdrawal and straightening section through a fourth steering roller to be subjected to finishing and withdrawal and straightening treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip enters a passivation section to perform passivation treatment on the formed steel strip; and finally, the steel strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled descaling galvanized steel strip is finished.
Optionally, a shot blasting machine is used for descaling in the descaling section, the abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate through the shot blasting machine to remove an oxide layer.
Optionally, the abrasive is steel shot or steel grit, and the material of the abrasive is carbon steel or stainless steel.
Optionally, the abrasive size is 0.1mm to 1.0 mm; the mass ratio of the abrasive to water in the mortar is 0.25: 1-4: 1; the throwing speed of the mortar from the shot blasting machine is 40-80 m/s, and the throwing processing time of the hot rolled steel plate is 1-5 s.
Optionally, the cooling manner of the cooling section after plating is one or more of air cooling, water mist cooling and water quenching cooling.
The invention has the beneficial effects that:
1. the invention can realize continuous production of descaling and galvanizing, the production process of the steel coil does not need to be oiled, cleaned and transferred, the unit process is compact, and the occupied area is small;
2. the machine set can realize two functions: (1) producing hot-rolled descaling galvanized steel strips, (2) producing hot-rolled descaling galvanized steel strips, wherein one unit has multiple purposes and multiple products;
3. the invention adopts mechanical descaling, has no discharge of pollutants such as waste water, waste gas and the like, and is environment-friendly;
4. compared with hot-rolled pickled plates, the strip steel subjected to descaling treatment by the method has higher surface roughness, and is beneficial to improving the adhesion of a zinc layer.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of an apparatus of the present invention;
FIG. 2 is a schematic flow diagram of a continuous descaling process for hot rolled steel strip;
FIG. 3 is a schematic flow chart of a continuous descaling and galvanizing production process of a hot-rolled steel strip.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, the reference numbers in the figures refer to the following elements: the device comprises an inlet section 1, an inlet loop 2, a descaling section 3, a first steering roller 4, a second steering roller 5, an annealing section 6, a zinc pot 7, an air knife 8, a cooling section 9 after plating, a third steering roller 10, a fourth steering roller 11, a finishing section 12, a pulling and straightening section 13, a passivation section 14, an outlet loop 15 and an outlet section 16.
The invention relates to a hot-rolled steel strip continuous descaling and hot galvanizing combined unit, which comprises an inlet section 1, an inlet loop 2, a descaling section 3, a first steering roller 4, an annealing section 6, a zinc pot 7, an air knife 8, a cooling section 9 after plating, a fourth steering roller 11, a finishing section 12, a straightening section 13, a passivation section 14, an outlet loop 15 and an outlet section 16 which are arranged in sequence; and a second steering roller 5 and a third steering roller 10 which are connected in parallel between the first steering roller 4 and the fourth steering roller 11.
Optionally, the annealing section 6 is a horizontal furnace or a vertical furnace, and the heating temperature of the steel strip in the annealing section 6 is 450-480 ℃; the finishing section 12 adopts one of a 2-roll finishing machine, a 4-roll finishing machine and a 6-roll finishing machine; and the descaling section 3 is subjected to descaling treatment by using a shot blasting machine, an abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate by using the shot blasting machine to remove an oxide layer.
The invention also relates to a production process for continuously descaling and hot galvanizing the hot rolled steel strip, which adopts the combined unit for continuously descaling and hot galvanizing the hot rolled steel strip; the production process comprises a hot rolled steel strip continuous descaling production process and a hot rolled steel strip continuous descaling galvanizing production process;
in the continuous descaling production process of the hot-rolled steel strip, the hot-rolled steel strip enters a descaling section 3 from an inlet section 1 through an inlet loop 2 for descaling treatment; the steel strip after descaling passes through a first turning roll 4, a second turning roll 5, a third turning roll 10 and a fourth turning roll 11, and then enters a finishing section 12 and a straightening and withdrawal section 13 for finishing and straightening and withdrawal treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip passes through a passivation section 14 and an outlet loop 15 and is output from an outlet section 16, and the production of the hot-rolled descaling steel strip is completed; in the production process, the steel strip only passes through the passivation section 14, and the equipment of the passivation section 14 does not participate in actual production operation;
in the continuous descaling and galvanizing production process of the hot-rolled steel strip, the hot-rolled steel strip enters a descaling section 3 from an inlet section 1 through an inlet loop 2 for descaling treatment; the steel strip after descaling enters an annealing section 6 through a first steering roller 4, the steel strip is heated to a certain temperature and then enters a zinc pot 7 for galvanization, and the steel strip is blown by an air knife 8 after galvanization and then enters a post-galvanization cooling section 9 for cooling to room temperature; then the steel strip enters a finishing section 12 and a pulling and straightening section 13 through a fourth steering roller 11 to be subjected to finishing and pulling and straightening treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip enters a passivation section 14 to perform passivation treatment on the formed steel strip; finally, the steel strip passes through an outlet loop 15 and then is output from an outlet section 16, and the production of the hot-rolled descaling galvanized steel strip is completed.
Optionally, a shot blasting machine is adopted to perform descaling treatment in the descaling section 3, an abrasive and water are mixed to prepare mortar, and the mortar is thrown to the surface of the hot rolled steel plate through the shot blasting machine to remove an oxide layer; the grinding material is steel shot or steel grit, and the material of the grinding material is carbon steel or stainless steel; the size of the abrasive is 0.1 mm-1.0 mm; the mass ratio of the abrasive to water in the mortar is 0.25: 1-4: 1; the throwing speed of the mortar from the shot blasting machine is 40-80 m/s, and the throwing processing time of the hot rolled steel plate is 1-5 s; the cooling mode of the cooling section 9 after plating is one or a combination of air cooling, water mist cooling and water quenching cooling.
Example one
In this embodiment, the hot-rolled descaling steel strip is produced by the unit in a descaling mode, the production process flow is shown in fig. 2, and the equipment in the dotted line part does not participate in actual production operation. The steel belt advancing direction is as follows: the method comprises the following steps of an inlet section 1, an inlet loop 2, a descaling section 3, a first steering roller 4, a second steering roller 5, a third steering roller 10, a fourth steering roller 11, a finishing section 12, a pulling and straightening section 13, an outlet loop 15 and an outlet section 16, wherein the specific process and technological parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section 1, a hot rolled steel coil is welded with the tail end of the strip of the previous steel coil after the head of the strip is cut off, and enters a descaling section 3 through an inlet loop 2 for descaling treatment;
2) the steel strip enters the descaling section 3 and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.5mm, the mass ratio of the steel grit to water is 0.5:1, the mortar casting speed is 55m/s, and the steel plate treatment time is 2 s;
3) after the steel strip is descaled, the steel strip enters a finishing, pulling and straightening section 13 through a first turning roll 4, a second turning roll 5, a third turning roll 10 and a fourth turning roll 11;
4) the finishing section 12 adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
5) the withdrawal and straightening elongation rate is 0.5 percent;
6) after the steel strip is subjected to finishing, pulling and straightening treatment, the steel strip enters the outlet section 16 through the outlet loop 15, the surface quality is checked at the outlet section 16, and then the steel strip is coated with oil, cut and coiled into coils.
Example two
In this embodiment, the hot-rolled descaling galvanized steel strip is produced by the unit in a descaling galvanizing mode, the production process flow is shown in fig. 3, and the dotted line part of the production process flow does not participate in actual production operation. The steel belt advancing direction is as follows: the method comprises the following steps of an inlet section 1, an inlet loop 2, a descaling section 3, a first steering roller 4, an annealing section 6, a zinc pot 7, an air knife 8, a cooling section 9 after plating, a fourth steering roller 11, a finishing section 12, a pulling and straightening section 13, a passivation section 14, an outlet loop 15 and an outlet section 16, wherein the specific process and process parameters are as follows:
1) after being uncoiled by an uncoiler at an inlet section 1, a hot rolled steel coil is welded with the tail end of the strip of the previous steel coil after the head of the strip is cut off, and enters a descaling section 3 through an inlet loop 2 for descaling treatment;
2) the steel strip enters the descaling section 3 and is subjected to shot blasting descaling treatment by adopting a wet type impeller, the ejection medium of the impeller is mortar formed by mixing steel sand and water, and the descaling treatment process parameters are as follows: the size of the steel grit is 0.5mm, the mass ratio of the steel grit to water is 0.5:1, the mortar casting speed is 55m/s, and the steel plate treatment time is 2 s;
3) after descaling treatment, the steel strip enters an annealing section 6 for heating, wherein the annealing section 6 adopts a horizontal annealing furnace, and the heating temperature of the steel strip is 470 ℃;
4) after the steel strip comes out of the annealing furnace, the steel strip directly enters a zinc pot 7 for galvanizing, and the temperature of zinc liquid in the zinc pot 7 is 460 ℃;
5) after the steel strip is taken out of the zinc pot 7, the steel strip is blown by an air knife 8, cooled to room temperature through air injection cooling and water quenching, and enters a finishing, pulling and straightening section 13 through a fourth steering roller 11;
6) the finishing section 12 adopts a 4-roller finishing machine, and the rolling elongation is 1.0 percent;
7) the withdrawal and straightening elongation rate is 0.5 percent;
8) after the steel strip is subjected to the finishing, pulling and straightening treatment, the steel strip enters a passivation section 14 for surface treatment, a hexavalent chromic acid solution is adopted as a passivation solution, the passivation solution is coated on the surface of the steel strip through a coating roller, and then the steel strip is dried to 80 ℃ and cooled to room temperature;
9) after the steel strip is passivated, the steel strip enters the outlet section 16 through the outlet loop 15, the surface quality is checked at the outlet section 16, and then the steel strip is coated with oil, cut and coiled into a coil.
The invention can realize continuous production of descaling and galvanizing, the production process of the steel coil does not need to be oiled, cleaned and transferred, the unit process is compact, and the occupied area is small; the machine set can realize two functions: the hot-rolled descaling galvanized steel strip is produced, and one unit has multiple purposes and multiple products; the invention adopts mechanical descaling, has no discharge of pollutants such as waste water, waste gas and the like, and is environment-friendly; compared with hot-rolled pickled plates, the strip steel subjected to descaling treatment by the method has higher surface roughness, and is beneficial to improving the adhesion of a zinc layer.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A hot rolled steel strip continuous descaling and hot galvanizing combined unit is characterized by comprising an inlet section, an inlet loop, a descaling section, a first steering roller, an annealing section, a zinc pot, an air knife, a cooling section after plating, a fourth steering roller, a finishing section, a straightening and withdrawal section, a passivation section, an outlet loop and an outlet section which are sequentially arranged; the device also comprises a second steering roller and a third steering roller which are connected in parallel between the first steering roller and the fourth steering roller.
2. The hot rolled steel strip combined continuous descaling and hot dip galvanizing unit according to claim 1, wherein the annealing zone is a horizontal furnace or a vertical furnace, and the heating temperature of the steel strip in the annealing zone is 450 ℃ to 480 ℃.
3. The hot rolled steel strip combined continuous descaling and hot dip galvanizing unit of claim 1, wherein the finishing section employs one of a 2-roll finishing machine, a 4-roll finishing machine, and a 6-roll finishing machine.
4. The combined unit for continuously descaling and hot galvanizing a hot rolled steel strip as claimed in claim 1, wherein the descaling section is descaled by a shot blasting machine, an abrasive is mixed with water to prepare mortar, and the mortar is ejected by a shot blasting machine to the surface of the hot rolled steel strip to remove an oxide layer.
5. A production process for continuously descaling and hot galvanizing a hot rolled steel strip is characterized by comprising the following steps: a combined unit for continuous descaling and hot galvanizing by using the hot-rolled steel strip as claimed in any one of claims 1 to 4; the production process comprises a hot rolled steel strip continuous descaling production process and a hot rolled steel strip continuous descaling galvanizing production process; in the continuous descaling production process of the hot-rolled steel strip, the hot-rolled steel strip enters a descaling section from an inlet section through an inlet loop to be descaled; the steel strip after descaling passes through a first turning roll, a second turning roll, a third turning roll and a fourth turning roll, and then enters a finishing section and a pulling and straightening section for finishing and pulling and straightening treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip passes through a passivation section and an outlet loop and is output from an outlet section, and the production of the hot-rolled descaling steel strip is finished; in the production process, the steel strip only passes through the passivation section, and equipment of the passivation section does not participate in actual production operation;
in the continuous descaling and galvanizing production process of the hot rolled steel strip, the hot rolled steel strip enters a descaling section from an inlet section through an inlet loop to be descaled; the steel strip after descaling enters an annealing section through a first steering roller, the steel strip is heated to a certain temperature and then enters a zinc pot for galvanizing, and after the steel strip is galvanized, the steel strip is blown by an air knife and then enters a post-galvanizing cooling section to be cooled to room temperature; then the steel strip enters a finishing section and a withdrawal and straightening section through a fourth steering roller to be subjected to finishing and withdrawal and straightening treatment, so that the surface quality and the plate shape of the steel strip are improved; then the steel strip enters a passivation section to perform passivation treatment on the formed steel strip; and finally, the steel strip is output from the outlet section after passing through the outlet loop, and the production of the hot-rolled descaling galvanized steel strip is finished.
6. The process for continuously descaling hot-rolled steel strip and hot-dip galvanizing as claimed in claim 5, wherein: and (3) descaling by adopting a shot blasting machine in a descaling section, mixing an abrasive with water to prepare mortar, and ejecting the mortar to the surface of the hot rolled steel plate by using the shot blasting machine to remove an oxide layer.
7. The process for continuously descaling hot-rolled steel strip and hot-dip galvanizing as claimed in claim 6, wherein: the grinding material is steel shot or steel grit, and the material of the grinding material is carbon steel or stainless steel.
8. The process for continuously descaling hot-rolled steel strip and hot-dip galvanizing as claimed in claim 6, wherein: the size of the abrasive is 0.1 mm-1.0 mm; the mass ratio of the abrasive to water in the mortar is 0.25: 1-4: 1; the throwing speed of the mortar from the shot blasting machine is 40-80 m/s, and the throwing processing time of the hot rolled steel plate is 1-5 s.
9. The process for continuously descaling hot-rolled steel strip and hot-dip galvanizing as claimed in claim 5, wherein: the cooling mode of the cooling section after plating is one or more of air cooling, water mist cooling and water quenching cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911114175.4A CN110629148A (en) | 2019-11-14 | 2019-11-14 | Combined unit for continuously descaling and hot galvanizing hot rolled steel strip and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911114175.4A CN110629148A (en) | 2019-11-14 | 2019-11-14 | Combined unit for continuously descaling and hot galvanizing hot rolled steel strip and production method thereof |
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| CN110629148A true CN110629148A (en) | 2019-12-31 |
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| CN201911114175.4A Pending CN110629148A (en) | 2019-11-14 | 2019-11-14 | Combined unit for continuously descaling and hot galvanizing hot rolled steel strip and production method thereof |
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