CN113579859A - Method for prolonging service life of continuous casting crystallizer copper plate under condition of high scrap steel ratio - Google Patents
Method for prolonging service life of continuous casting crystallizer copper plate under condition of high scrap steel ratio Download PDFInfo
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- 229910052802 copper Inorganic materials 0.000 title claims abstract description 105
- 239000010949 copper Substances 0.000 title claims abstract description 105
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000009749 continuous casting Methods 0.000 title claims abstract description 88
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000011282 treatment Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims description 92
- 244000137852 Petrea volubilis Species 0.000 claims description 52
- 238000005498 polishing Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
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- 229910002440 Co–Ni Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/08—Accessories for starting the casting procedure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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Abstract
A method for prolonging the service life of a copper plate of a continuous casting crystallizer under the condition of high scrap ratio comprises the following steps: dividing the inner surface of a copper plate of a continuous casting crystallizer into a first area and a second area; acquiring the continuous online service time of the copper plate of the continuous casting crystallizer; performing first treatment on the attachments of the first area according to the continuous online service time; and carrying out second treatment on the attachments of the second area according to the continuous online service time. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of the high scrap ratio combines production practical operation, provides an idea of heavy processing of a high-temperature region and light processing of a low-temperature region based on temperature field distribution of steel liquid in the crystallizer, adopts a method of mechanical removal in different regions, can effectively prevent the attachment of low-melting-point harmful elements on the surface layer of the copper plate of the crystallizer under the condition of the high scrap ratio, solves the problem of copper plate corrosion caused by the attachment of the low-melting-point elements, and thereby effectively prolongs the service life of the copper plate.
Description
Technical Field
The application relates to the field of ferrous metallurgy continuous casting, in particular to a method for prolonging the service life of a continuous casting crystallizer copper plate under the condition of high scrap steel ratio.
Background
The continuous casting is to pour the qualified molten steel into a water-cooled crystallizer at a certain speed, a water cooling system is arranged in the wall of the copper crystallizer, the cooling water continuously takes away the heat of the molten steel, a blank shell is formed on the copper wall surface, the crystallizer is vibrated at a certain frequency, the blank shell is separated from the wall surface of the crystallizer along with the vibration of the crystallizer, and the blank shell and the wall surface of the crystallizer downwards enter a secondary cooling zone under the action of a dummy bar to form a casting blank.
The waste steel is used as a recyclable renewable resource, high-energy-consumption and high-pollution processes such as sintering, coking and blast furnaces in the traditional long process are avoided, the energy consumption and waste emission indexes are far superior to those of the traditional long process smelting, under the condition of certain energy consumption, 500kg of standard coal can be saved by replacing 1t of molten iron with 1t of waste steel in converter smelting, and the emission of CO2 is reduced by 73% in the longer process. Therefore, the improvement of the converter scrap ratio becomes one of the important ways of increasing production, reducing consumption, saving energy and reducing emission for iron and steel enterprises. In recent years, a great deal of work is carried out in China on the aspect of improving the ratio of converter scrap, and through technical measures such as iron-steel interface technology and converter process optimization, process heat loss reduction, scrap preheating and the like, the ratio of converter steel-making scrap in China is continuously improved and can reach about 35% at present.
The scrap steel has various types and complex components, and often contains elements such as Zn, Pb, Sn, Bi and the like besides conventional alloy elements such as Si, Mn, P, S, Cr, Ni, Cu and the like, the elements are called residual elements and are often harmful to the performance of steel, and the residual elements are usually controlled within 0.2% in the production process and have relatively small influence on the performance of steel products. Along with the increase of the adding amount of the scrap steel in the smelting process, the amount of residual elements in the steel is gradually increased, so that the excessive residual elements in the steel can be caused, and the influence on steelmaking and continuous casting equipment can be caused.
Copper has good thermal conductivity and is an ideal material for the crystallizer copper plate, but the copper has low hardness and poor wear resistance, and the service life of the copper is limited. In order to prevent the surface defects of casting blanks and prolong the service life of copper plates, some crystallizer copper plates are treated by surface coating layers, which are typically Cr-Ni coating layers, Co-Ni coating layers and the like, the thickness of the coating is 0.1mm-1.0mm, and the service life of the copper plates is effectively prolonged by using the coating. The main factors influencing the service life of the copper plate of the continuous casting crystallizer comprise the material of the copper plate or a surface coating, and the process control of the continuous casting process, including the cooling condition of the copper plate, the quality of molten steel, a maintenance repair technology and the like.
The adding amount of the scrap steel is increased, the molten iron amount is reduced, the total heat is greatly reduced, and in order to compensate the heat loss under the condition of large scrap steel ratio, the smelting process and the production efficiency of each steel plant are greatly changed, so that the equipment, process and quality problems caused by the change are increasingly prominent.
With the increase of the consumption of scrap steel in the smelting process, the amount of residual elements (such as Cu, Zn, Pb, Sn, Bi and other elements) in the steel is gradually increased, and in the production process, the residual elements are usually controlled within 0.2 percent, so that the influence on the performance of steel products is relatively small. Such elements, especially Zn, Pb, Sn, Bi and the like, usually have a low melting point (about 200-. In particular, the high temperature in the meniscus region will help these low melting alloying elements diffuse into the copper plate, which will result in the formation of hard and brittle brass phases at the surface of the copper plate, which will accelerate crack propagation into the copper plate, resulting in a large reduction in the lifetime of the mould.
At present, in the aspect of prolonging the service life of the copper plate, the research on the material of the copper plate and the coating and the improvement of the continuous casting process are mainly carried out by domestic and foreign steel enterprises and scientific research institutions. The Huqinshan of Shanghai Baoshan Steel Co Ltd develops the research of 'the technical practice of using a slab continuous casting crystallizer', and the analysis finds that the performance differences of the coatings made of different materials, such as hardness, wear resistance, thermal expansion coefficient and the like, are large, and Co: ni ═ 1: the plating layer of 9 can improve the wear resistance and prevent the stripping, and the comprehensive service life of the crystallizer copper plate is prolonged from 200 to 300 furnaces to 400 to 500 furnaces. The temperature maintenance of the Jinan iron and steel company develops 'analysis and prevention measures for crack reasons of a crystallizer copper plate of a high-pulling-speed continuous casting machine', finds that the root cause of crack generation of a meniscus of the crystallizer copper plate is caused by that stress fatigue exceeds the stress limit of a copper plate parent metal, and improves a continuous casting process and the copper plate parent metal to improve the single steel passing amount of the crystallizer of the high-pulling-speed continuous casting machine by 4.5 kilotons from 2.25 kilotons so as to obtain good effect.
However, the following problems still exist at present:
(1) along with the increase of the consumption of the scrap steel in the smelting process, the residual elements of Zn, Pb, Sn, Bi and the like in the steel are generally low in melting point (about 200-, the service life of the crystallizer is greatly reduced;
(2) the existing technological measures related to the method for prolonging the service life of the copper plate, such as strictly controlling the temperature of cooling water of the copper plate, improving the design of a coating and the like, can not avoid the attachment of residual elements in molten steel on the surface of the copper plate when the residual elements are in contact with the copper plate.
Disclosure of Invention
The application provides a method for prolonging the service life of a copper plate of a continuous casting crystallizer under the condition of high scrap steel ratio, which aims to solve the technical problem that residual elements in molten steel are attached to the surface of the copper plate when the residual elements are in contact with the copper plate.
The application provides a method for prolonging the service life of a copper plate of a continuous casting crystallizer under the condition of high scrap steel ratio, which comprises the following steps:
dividing the inner surface of a copper plate of a continuous casting crystallizer into a first area and a second area;
acquiring the continuous online service time of the copper plate of the continuous casting crystallizer;
performing first treatment on the attachments of the first area according to the continuous online service time;
and carrying out second treatment on the attachments of the second area according to the continuous online service time.
Preferably, the dividing of the inner surface of the copper plate of the continuous casting mold into a first zone and a second zone comprises the steps of:
acquiring the temperature field distribution condition of the molten steel in the continuous casting crystallizer in the continuous casting process;
determining a high-temperature region in which high-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the high temperature region into the first region;
determining a low-temperature region in which low-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the low temperature region into the second region.
Preferably, the first processing of the attachments of the first area according to the continuous online usage time includes the steps of:
judging whether the continuous online service time is less than or equal to a first time;
if so, performing first grinding on the attachments in the first area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if so, carrying out second grinding on the attachment of the first area;
and if not, performing third grinding on the attachment of the first area.
Preferably, the first grinding of the attachments of the first region comprises the steps of:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 2-3 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 15-25 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 2-3 times by using the pneumatic sand paper grinding machine at the speed of 15-25 cm/min.
Preferably, the second polishing of the attachments of the first region includes the steps of:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the first area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the first area after coping.
Preferably, the third grinding of the attachments of the first region comprises the steps of:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
grinding the surface of the first area for 3-4 times at a speed of 15-25 cm/min by using the pneumatic sand paper grinder;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 3 to 4 times by using the pneumatic sand paper grinding machine at the speed of 15 to 25 cm/min.
Preferably, the second processing of the attachments of the second area according to the continuous online usage time includes the steps of:
judging whether the continuous online service time is less than or equal to a first time;
if yes, performing first grinding on the attachments of the second area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if yes, second grinding is carried out on the attachments of the second area;
and if not, performing third grinding on the attachments of the second area.
Preferably, the first grinding of the attachments of the second region comprises the steps of:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 45-55 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 1 to 2 times by using the pneumatic sand paper grinding machine at the speed of 45 to 55 cm/min.
Preferably, the second polishing of the attachments of the second region comprises the steps of:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the second area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the second area after coping.
Preferably, the third polishing of the attachments of the second region comprises the steps of:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the second area by using the pneumatic sand paper grinder at the speed of 35-45 cm/min;
judging whether the surface attachments of the second area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the second area for 1 to 2 times by using the pneumatic sand paper grinder at the speed of between 35 and 45 cm/min.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of the high scrap ratio combines production practical operation, provides an idea of heavy processing of a high-temperature region and light processing of a low-temperature region based on temperature field distribution of steel liquid in the crystallizer, adopts a method of mechanical removal in different regions, can effectively prevent the attachment of low-melting-point harmful elements on the surface layer of the copper plate of the crystallizer under the condition of the high scrap ratio, solves the problem of copper plate corrosion caused by the attachment of the low-melting-point elements, and thereby effectively prolongs the service life of the copper plate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic view of a copper plate in a continuous casting crystallizer in example 1 before the method for prolonging the service life of the copper plate under the condition of high scrap ratio provided by the application is adopted;
FIG. 2 is a schematic view of the copper plate in the continuous casting crystallizer in example 1 after the method for prolonging the service life of the copper plate under the condition of high scrap ratio provided by the application is adopted;
FIG. 3 is a schematic view of the copper plate in the embodiment 2 before the method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio provided by the application is adopted;
FIG. 4 is a schematic view of the copper plate in the embodiment 2 after the method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio provided by the application is adopted.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiment of the application, the application provides a method for prolonging the service life of a copper plate of a continuous casting crystallizer under the condition of high scrap steel ratio, and the method comprises the following steps:
s1: dividing the inner surface of a copper plate of a continuous casting crystallizer into a first area and a second area;
in an embodiment of the present application, the dividing the inner surface of the copper plate of the continuous casting mold into a first zone and a second zone includes the steps of:
acquiring the temperature field distribution condition of the molten steel in the continuous casting crystallizer in the continuous casting process;
determining a high-temperature region in which high-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the high temperature region into the first region;
determining a low-temperature region in which low-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the low temperature region into the second region.
In the embodiment of the application, the analysis on the distribution situation of the temperature field of the molten steel in the continuous casting crystallizer in the continuous casting process shows that the molten steel forms a billet shell after entering the crystallizer, the billet shell becomes thicker and thicker along with the continuous casting, the overall temperature in the crystallizer is gradually reduced from top to bottom, wherein a high-temperature region is mainly concentrated in a region which is more than 300mm away from the upper opening of a copper plate of the crystallizer, the temperature of the molten steel is about 1300-1500 ℃, most of the molten steel is in a liquid state in the region, and low-melting-point elements in the steel are easily attached to the surface of the copper plate, so the region is a high-temperature region, namely a first region; the temperature of the molten steel in the area which is less than 300mm away from the upper opening of the copper plate of the crystallizer is 1100-1300 ℃, the shell of the area is thickened, the temperature is reduced, the adhesion amount of low-melting-point elements in the steel is greatly reduced, and the area is a low-temperature area, namely a second area.
S2: acquiring the continuous online service time of the copper plate of the continuous casting crystallizer;
in the embodiment of the application, the continuous online service time of the continuous casting mold copper plate can be obtained through a timing device, and can be used for the subsequent steps.
S3: performing first treatment on the attachments of the first area according to the continuous online service time;
in an embodiment of the present application, the first processing of the attached matter in the first area according to the continuous online usage time includes:
judging whether the continuous online service time is less than or equal to a first time;
if so, performing first grinding on the attachments in the first area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if so, carrying out second grinding on the attachment of the first area;
and if not, performing third grinding on the attachment of the first area.
In the embodiment of the application, after the continuous online service time of the copper plate of the continuous casting crystallizer is obtained, the continuous online service time is less than or equal to 15 hours, the continuous online service time is between 15 hours and 50 hours, and the continuous online service time is greater than or equal to 50 hours, the time interval from the previous maintenance of the crystallizer to the current maintenance is distinguished, and different polishing treatments are carried out on attachments in the first area according to different time interval divisions.
In an embodiment of the present application, the first grinding of the attachments of the first region includes:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 2-3 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 15-25 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 2-3 times by using the pneumatic sand paper grinding machine at the speed of 15-25 cm/min.
In the embodiment of the application, after continuous casting is stopped for a crystallizer which is continuously used on line for less than or equal to 15 hours, the continuous casting crystallizer is kept in an on-line state, and then a pneumatic sand paper sharpening machine is used on line to sharpen the surface of a copper plate within a depth range of 0-300mm from the upper opening of the crystallizer at a speed of 15-25 cm/min for 2-3 times until surface attachments are removed to expose a base material.
In an embodiment of the present application, the second polishing of the attachments of the first region includes:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the first area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the first area after coping.
In the embodiment of the application, after continuous casting stops pouring, the continuous casting crystallizer is converted from the on-line state to the off-line state for the crystallizer with the continuous on-line service time of more than or equal to 50 hours, then the copper plate within the depth range of 0-300mm away from the upper opening of the crystallizer is polished by a grinding machine or equipment capable of quantitatively polishing the copper plate, the polishing depth is 0.2mm, and the surface of the copper plate of the crystallizer is polished after polishing, so that the production requirement of the surface of the copper plate of the crystallizer is met.
In an embodiment of the present application, the third polishing of the attachments in the first region includes:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
grinding the surface of the first area for 3-4 times at a speed of 15-25 cm/min by using the pneumatic sand paper grinder;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 3 to 4 times by using the pneumatic sand paper grinding machine at the speed of 15 to 25 cm/min.
In the embodiment of the application, after continuous casting is stopped for a crystallizer which is continuously used on line for 15-50 hours, the continuous casting crystallizer is kept in an on-line state, and then a pneumatic sand paper sharpening machine is adopted on line to sharpen the surface of a copper plate within a depth range of 0-300mm from the upper opening of the crystallizer at a speed of 15-25 cm/min for 3-4 times until the surface attachments are removed and the base material is exposed.
S4: and carrying out second treatment on the attachments of the second area according to the continuous online service time.
In an embodiment of the present application, the second processing of the attachments of the second area according to the continuous online usage time includes:
judging whether the continuous online service time is less than or equal to a first time;
if yes, performing first grinding on the attachments of the second area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if yes, second grinding is carried out on the attachments of the second area;
and if not, performing third grinding on the attachments of the second area.
In the embodiment of the application, after the continuous online service time of the copper plate of the continuous casting crystallizer is obtained, the continuous online service time is not more than 15 hours, the continuous online service time is between 15 hours and 50 hours, and the continuous online service time is not less than 50 hours, the time interval from the previous maintenance of the crystallizer to the current maintenance is distinguished, and different polishing treatments are carried out on attachments in the second area according to different time interval divisions.
In an embodiment of the present application, the first grinding of the attachments of the second region includes:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 45-55 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 1 to 2 times by using the pneumatic sand paper grinding machine at the speed of 45 to 55 cm/min.
In the embodiment of the application, after continuous casting is stopped for a crystallizer which is continuously used on line for less than or equal to 15 hours, the continuous casting crystallizer is kept in an on-line state, and then a pneumatic sand paper sharpening machine is used on line to sharpen the surface of a copper plate within a depth range of less than 300m away from an upper opening of the crystallizer at a speed of 45-55 cm/min for 1-2 times until surface attachments are removed and a base material is exposed.
In an embodiment of the present application, the second polishing of the attachments of the second area includes:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the second area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the second area after coping.
In the embodiment, after continuous casting is stopped, the continuous casting crystallizer is changed from the on-line state to the off-line state for the crystallizer with the continuous on-line service time of more than or equal to 50 hours, and then the copper plate within the depth range of less than 300mm away from the upper opening of the crystallizer is polished by a grinding machine or equipment capable of quantitatively polishing the copper plate, wherein the polishing depth is 0.2mm, and the surface of the copper plate of the crystallizer is polished after polishing, so that the surface of the copper plate of the crystallizer meets the production requirements.
In an embodiment of the present application, the third polishing of the attachments in the second region includes:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the second area by using the pneumatic sand paper grinder at the speed of 35-45 cm/min;
judging whether the surface attachments of the second area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the second area for 1 to 2 times by using the pneumatic sand paper grinder at the speed of between 35 and 45 cm/min.
In the embodiment of the application, after continuous casting is stopped for a crystallizer which is continuously used on line for 15-50 hours, the continuous casting crystallizer is kept in an on-line state, and then a pneumatic sand paper sharpening machine is adopted on line to sharpen the surface of a copper plate within a depth range of 0-300mm from the upper opening of the crystallizer at a speed of 35-45 cm/min for 1-2 times until the surface attachments are removed and the base material is exposed.
The technical solution of the present invention is further described below with reference to specific embodiments.
Example 1:
the method is used for the wide-surface copper plate of the sheet billet crystallizer, a mode of combining online grinding and offline maintenance is adopted, for example, the surface crack corrosion depth can be obviously reduced in comparison with the graphs shown in figures 1 and 2 before and after grinding, the repeated use frequency of the crystallizer is improved to 6-7 times from 3-4 times, the service life of the copper plate of the crystallizer is improved to 8-9 ten thousand from 3-4 ten thousand t, and a good effect is achieved.
Example 2:
the method is used for the narrow-surface copper plate of the common slab crystallizer, the mode of combining online grinding and offline maintenance is adopted, for example, the modes shown in the figures 3 and 4 are compared before and after grinding, the comprehensive service life of the crystallizer copper plate is prolonged from 200-250 furnaces to 300-400 furnaces, the service life of the crystallizer copper plate is prolonged from 3-5 ten thousand to 6-7 thousand, and a good effect is achieved.
The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap steel ratio has the following beneficial effects:
(1) under the condition of high scrap ratio in molten steel smelting, the method for maintaining the surface of the crystallizer can effectively prevent residual elements (such as Zn, Pb, Sn, Bi and other elements) with low melting point in steel from being attached to the surface of the crystallizer, thereby reducing the corrosion of the melting point elements to the copper plate or a coating, preventing the surface of the copper plate from embrittlement and cracking, and prolonging the service life of the copper plate;
(2) the surface of the crystallizer is treated differently by adopting an online mode and an offline mode 2, so that the crystallizer is high in flexibility, simple to operate and good in effect.
The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of the high scrap ratio combines production practical operation, provides an idea of heavy processing of a high-temperature region and light processing of a low-temperature region based on temperature field distribution of steel liquid in the crystallizer, adopts a method of mechanical removal in different regions, can effectively prevent the attachment of low-melting-point harmful elements on the surface layer of the copper plate of the crystallizer under the condition of the high scrap ratio, solves the problem of copper plate corrosion caused by the attachment of the low-melting-point elements, and thereby effectively prolongs the service life of the copper plate.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for prolonging the service life of a copper plate of a continuous casting crystallizer under the condition of high scrap ratio is characterized by comprising the following steps:
dividing the inner surface of a copper plate of a continuous casting crystallizer into a first area and a second area;
acquiring the continuous online service time of the copper plate of the continuous casting crystallizer;
performing first treatment on the attachments of the first area according to the continuous online service time;
and carrying out second treatment on the attachments of the second area according to the continuous online service time.
2. The method for improving the service life of the copper plate of the continuous casting mold under the condition of high scrap ratio according to claim 1, wherein the step of dividing the inner surface of the copper plate of the continuous casting mold into a first zone and a second zone comprises the steps of:
acquiring the temperature field distribution condition of the molten steel in the continuous casting crystallizer in the continuous casting process;
determining a high-temperature region in which high-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the high temperature region into the first region;
determining a low-temperature region in which low-temperature molten steel is concentrated according to the distribution condition of the molten steel temperature field;
dividing the low temperature region into the second region.
3. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio according to claim 1, wherein the first treatment of the attachment of the first area according to the continuous online service time comprises the following steps:
judging whether the continuous online service time is less than or equal to a first time;
if so, performing first grinding on the attachments in the first area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if so, carrying out second grinding on the attachment of the first area;
and if not, performing third grinding on the attachment of the first area.
4. The method for improving the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as claimed in claim 3, wherein the first grinding of the attachments of the first area comprises the following steps:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 2-3 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 15-25 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 2-3 times by using the pneumatic sand paper grinding machine at the speed of 15-25 cm/min.
5. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as claimed in claim 3, wherein the second grinding of the attachments of the first area comprises the following steps:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the first area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the first area after coping.
6. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as claimed in claim 3, wherein the third grinding of the attachments of the first area comprises the following steps:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
grinding the surface of the first area for 3-4 times at a speed of 15-25 cm/min by using the pneumatic sand paper grinder;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 3 to 4 times by using the pneumatic sand paper grinding machine at the speed of 15 to 25 cm/min.
7. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio according to claim 1, wherein the second treatment of the attachment of the second area according to the continuous online service time comprises the following steps:
judging whether the continuous online service time is less than or equal to a first time;
if yes, performing first grinding on the attachments of the second area;
if not, judging whether the continuous online service time is more than or equal to a second time;
if yes, second grinding is carried out on the attachments of the second area;
and if not, performing third grinding on the attachments of the second area.
8. The method for improving the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as claimed in claim 7, wherein the first grinding of the attachments of the second area comprises the following steps:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the first area by using the pneumatic sand paper grinder at the speed of 45-55 cm/min;
judging whether the surface attachments of the first area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the first area for 1 to 2 times by using the pneumatic sand paper grinding machine at the speed of 45 to 55 cm/min.
9. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as recited in claim 7, wherein the second grinding of the attachments of the second area comprises the following steps:
converting the continuous casting crystallizer from an on-line state to an off-line state;
preparing a grinding machine;
grinding the surface of the second area by using the grinding machine, wherein the grinding depth is 0.2 mm;
and polishing the surface of the second area after coping.
10. The method for prolonging the service life of the copper plate of the continuous casting crystallizer under the condition of high scrap ratio as recited in claim 7, wherein the third grinding of the attachments of the second area comprises the following steps:
keeping the continuous casting crystallizer in an on-line state;
preparing a pneumatic sand paper sharpening machine;
carrying out 1-2 times of grinding on the surface of the second area by using the pneumatic sand paper grinder at the speed of 35-45 cm/min;
judging whether the surface attachments of the second area are removed or not;
if so, stopping the pneumatic sand paper sharpening machine;
and if not, returning to the step of grinding the surface of the second area for 1 to 2 times by using the pneumatic sand paper grinder at the speed of between 35 and 45 cm/min.
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Cited By (1)
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| CN114708935A (en) * | 2022-06-07 | 2022-07-05 | 济南东方结晶器有限公司 | Crystallizer copper plate quality optimization method and system based on heat conduction performance evaluation |
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