CN115921807A - Method for reducing banded structure level of hot-rolled strip steel - Google Patents
Method for reducing banded structure level of hot-rolled strip steel Download PDFInfo
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- CN115921807A CN115921807A CN202211284285.7A CN202211284285A CN115921807A CN 115921807 A CN115921807 A CN 115921807A CN 202211284285 A CN202211284285 A CN 202211284285A CN 115921807 A CN115921807 A CN 115921807A
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Abstract
The application relates to a method for reducing the zonal structure level of a hot rolled strip, comprising: electromagnetic stirring is carried out in the continuous casting process of the molten steel, and the current and the frequency of the electromagnetic stirring are controlled; controlling the casting blank pouring speed, and carrying out dynamic light reduction in the molten steel continuous casting process to obtain a plate; controlling the hot rolling temperature and time of the plate blank; and controlling the final rolling temperature and the coiling temperature of the sheet blank after hot rolling. The method can improve the hot plate structure by adjusting the steel-making and hot rolling processes under the conditions of the existing steel type components, hot rolling production process and equipment by controlling the continuous casting electromagnetic stirring parameters, controlling the pouring speed and dynamic soft reduction, the time of a plate blank in a furnace, the finish rolling temperature and the coiling temperature, thereby reducing the level of the hot coil strip-shaped structure.
Description
Technical Field
The application relates to the technical field of steel rolling production, in particular to a method for reducing the level of a banded structure of hot-rolled strip steel.
Background
The development and production of hot-rolled high-carbon steel are gradually accelerated in recent years, and the application range of the hot-rolled high-carbon steel is increasingly wide in various fields such as automobiles, tools, agricultural machinery and the like. Hot rolled high carbon steel has an increasing amount of its market use by virtue of its excellent structure and properties. The banded structure is one of the internal defects of the steel, and appears in the microstructure of the hot-rolled low-carbon structural steel, and ferrite grains and pearlite grains which are arranged in parallel along the rolling direction, distributed in a layered manner and are in the same strip shape.
High-carbon steel or high-carbon alloy steel is increasingly applied to cold rolling, is generally used for manufacturing high-end saw blades, needles, sealing gaskets and other fields after cold rolling and annealing, has strict requirements on raw material tissues, and requires higher requirements on the banded grade of the tissues by downstream customers, so that corresponding process improvement is required in a targeted manner.
Disclosure of Invention
The application provides a method for reducing the level of a banded structure of hot-rolled strip steel, which aims to solve the technical problem that the level of the banded structure of the existing hot-rolled strip steel cannot meet the requirement.
In a first aspect, the present application provides a method of reducing the band structure level of a hot rolled steel strip, the method comprising:
electromagnetic stirring is carried out in the continuous casting process of the molten steel, and the current and the frequency of the electromagnetic stirring are controlled;
controlling the casting blank pouring speed, and carrying out dynamic light reduction in the molten steel continuous casting process to obtain a sheet;
controlling the hot rolling temperature and time of the slab;
and controlling the final rolling temperature and the coiling temperature of the sheet blank after hot rolling.
Further, the current of the electromagnetic stirring is less than or equal to 300A; and/or
The frequency of the electromagnetic stirring is less than or equal to 8Hz.
Further, the current of the electromagnetic stirring is 150-300A, and the frequency of the electromagnetic stirring is 4-8Hz.
Furthermore, the pouring speed is less than or equal to 1.2m/min.
Further, the hot rolling temperature is more than or equal to 1150 ℃; and/or
The hot rolling time is more than or equal to 150min.
Further, the hot rolling temperature is 1150-1290 ℃, and the hot rolling time is 150-210mim.
Further, the finishing temperature is less than or equal to 900 ℃; the coiling temperature is less than or equal to 640 ℃.
Further, the finishing temperature is 830-900 ℃.
Further, the coiling temperature is 560-640 ℃.
Further, the carbon content of the molten steel is as follows by mass percent: 0.3 to 0.5 percent.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method for reducing the level of the banded structure of the hot-rolled strip steel, the positive segregation and the negative segregation of the plate blank are reduced by performing electromagnetic stirring, and the structure is homogenized; by controlling the casting speed of the casting blank and carrying out dynamic soft reduction, the solidification shrinkage of the casting blank is compensated, solute elements are redistributed in the molten steel, and the solidification structure is more uniform and compact, so that the segregation of the slab is effectively improved, and the structure components are homogenized; the homogenization degree of the microcosmic components is increased and the improvement degree of segregation is enhanced by controlling the hot rolling temperature and time; the tissue morphology is controlled by controlling the finish rolling temperature and the coiling temperature, and the level of the banded tissue is reduced. Therefore, the method can effectively reduce the hot rolled strip tissue level.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 to obtain other drawings without inventive exercise.
FIG. 1 is a zonal structure diagram of a high carbon steel obtained by the method for reducing the zonal structure level of a hot-rolled strip steel according to example 1 of the present application;
FIG. 2 is a band structure diagram of a high carbon steel obtained by the method for reducing the band structure level of a hot rolled steel strip according to example 2 of the present application;
FIG. 3 is a band structure diagram of a high carbon steel obtained by the method for reducing the band structure grade of a hot rolled steel strip according to comparative example 1 of the present application;
FIG. 4 is a band structure diagram of a high carbon steel obtained by the method for reducing the band structure grade of a hot rolled steel strip according to comparative example 2 of the present application;
FIG. 5 is a schematic flow chart of a method for reducing the zonal structure level of a hot-rolled strip according to an embodiment of the present disclosure.
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.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present application are either commercially available or can be prepared by existing methods.
The development and production of hot-rolled high-carbon steel are gradually accelerated in recent years, and the application range of the hot-rolled high-carbon steel is increasingly wide in various fields such as automobiles, tools, agricultural machinery and the like. The hot-rolled high-carbon steel has excellent structure and performance, and the market usage amount of the hot-rolled high-carbon steel is continuously increased. The banded structure is one of the internal defects of the steel, and appears in the microstructure of the hot-rolled low-carbon structural steel, and ferrite grains and pearlite grains which are arranged in parallel along the rolling direction, distributed in a layered manner and are in the same strip shape.
High-carbon steel or high-carbon alloy steel is increasingly applied to cold rolling, is generally used for manufacturing high-end saw blades, needles, sealing gaskets and other fields after cold rolling and annealing, has strict requirements on raw material tissues, and requires higher requirements on the banded grade of the tissues by downstream customers, so that corresponding process improvement is required in a targeted manner.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the present application provides a method for reducing the band structure level of a hot rolled strip, as shown in fig. 5, the method comprising:
electromagnetic stirring is carried out in the continuous casting process of the molten steel, and the current and the frequency of the electromagnetic stirring are controlled;
controlling the casting blank pouring speed, and carrying out dynamic light reduction in the molten steel continuous casting process to obtain a sheet;
controlling the hot rolling temperature and time of the slab;
and controlling the final rolling temperature and the coiling temperature of the plate blank after hot rolling.
According to the method for reducing the level of the banded structure of the hot-rolled strip steel, the positive segregation and the negative segregation of the plate blank are reduced by performing electromagnetic stirring, and the structure is homogenized; by controlling the casting speed of the casting blank and carrying out dynamic soft reduction, the solidification shrinkage of the casting blank is compensated, solute elements are redistributed in the molten steel, and the solidification structure is more uniform and compact, so that the segregation of the slab is effectively improved, and the structure components are homogenized; the homogenization degree of the microcosmic components is increased and the improvement degree of segregation is enhanced by controlling the hot rolling temperature and time; the structure appearance is controlled by controlling the finishing temperature and the coiling temperature, and the level of the banded structure is reduced. Therefore, the method can effectively reduce the hot rolled strip tissue level.
As an implementation manner of the embodiment of the invention, the current of the electromagnetic stirring is less than or equal to 300A; and/or
The frequency of the electromagnetic stirring is less than or equal to 8Hz.
In the application, the input electromagnetic stirring current/frequency is too large, so that the metal flow is too large, negative segregation is formed, micro segregation of components in the thickness direction of the plate blank can be caused, the segregation can not be eliminated through heating, annealing and other processes, and only can be reduced, so that the transformation of the structure morphology of the hot coil cooling process can be influenced, and the structure banding is further influenced.
As an implementation mode of the embodiment of the invention, the current of the electromagnetic stirring is 150-300A, and the frequency of the electromagnetic stirring is 4-8Hz.
In this application, do not drop into electromagnetic stirring or drop into electromagnetic stirring electric current/frequency undersize, can not improve slab middle part tissue, the positive segregation condition in center can appear, can cause the micro segregation of slab along thickness direction composition, and this segregation can not be eliminated through technologies such as heating, annealing, can only alleviate, can influence the change of hot coil cooling process tissue appearance from this, and then influence the tissue banding.
As an implementation manner of the embodiment of the invention, the casting speed is less than or equal to 1.2m/min.
In the application, under the condition of ensuring stable production, the pouring speed is reduced as much as possible, dynamic soft reduction is executed, the slab segregation can be effectively improved, and the tissue components are homogenized, so that the band-shaped level of the hot-rolled tissue is reduced under the same rolling condition.
As an implementation mode of the embodiment of the invention, the hot rolling temperature is more than or equal to 1150 ℃; and/or
The hot rolling time is more than or equal to 150min.
In this application, the slab rolls off the production line from the conticaster after, and the tissue is sent into the heating furnace and is heated, keeps warm, through control slab heating temperature and heat preservation time, makes its microcosmic component homogenization degree increase, and segregation improvement degree reinforcing.
As an implementation mode of the embodiment of the invention, the hot rolling temperature is 1150-1290 ℃, and the hot rolling time is 150-210mim.
In the application, the maximum value of hot rolling temperature and time is limited, the production rhythm can be ensured, the production efficiency is improved, and the high carbon steel surface decarburization is serious due to overhigh temperature/time.
As an implementation manner of the embodiment of the invention, the finishing temperature is less than or equal to 900 ℃; the coiling temperature is less than or equal to 640 ℃.
According to the method, after the heated plate blank is subjected to multi-pass rough rolling and finish rolling, the finish rolling temperature is controlled to be less than or equal to 900 ℃, the coiling temperature is controlled to be less than or equal to 640 ℃, namely the actual temperature of the coil is reduced, the tissue cooling speed is accelerated, the banded structure can be refined, and F can even be precipitated along the crystal boundary and distributed in a net shape along with the reduction of the coiling temperature, so that no banded structure exists.
As an implementation manner of the embodiment of the invention, the finishing temperature is 830-900 ℃.
As an implementation mode of the embodiment of the invention, the coiling temperature is 560-640 ℃.
In the application, the minimum value of the finishing temperature and the coiling temperature is limited, and the problems that the strength and the hardness are too high due to too low temperature, even an F + P tissue (a B tissue is obtained) cannot be obtained, and the use requirements of customers cannot be met can be avoided.
As an implementation mode of the embodiment of the invention, the carbon content of the molten steel is as follows by mass percent: 0.3 to 0.5 percent.
In the application, the content of C is controlled to be less than 0.5 percent, and the banded grading of the tissue cannot be carried out due to the overhigh content of carbon; the carbon content is more than 0.3%, and the band grade can be properly reduced.
The present application is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Example 1
A method for reducing the band structure level of a hot-rolled strip steel, as shown in fig. 5, specifically comprising:
electromagnetic stirring is carried out in the continuous casting process of molten steel, the current of the electromagnetic stirring is controlled to be 220A, and the frequency of the electromagnetic stirring is 6Hz;
controlling the casting speed of the casting blank to be 1.1m/min, and carrying out dynamic light reduction in the continuous casting process of the molten steel to obtain a sheet;
controlling the hot rolling temperature of the plate blank to be 1220 ℃ and the hot rolling time to be 180mim;
controlling the final rolling temperature of the sheet blank after hot rolling to be 890 ℃ and the coiling temperature to be 630 ℃.
The carbon content of the high-carbon steel of the present example is, in mass percent: 0.45%, 3.0mm × 1100mm in gauge, and the band structure grade is shown in FIG. 1.
Example 2
A method for reducing the zonal structure level of a hot-rolled strip steel, as shown in fig. 5, specifically comprising:
electromagnetic stirring is carried out in the continuous casting process of molten steel, the current of the electromagnetic stirring is controlled to be 150A, and the frequency of the electromagnetic stirring is 4Hz;
controlling the casting speed of the casting blank to be 1.0m/min, and carrying out dynamic light reduction in the continuous casting process of the molten steel to obtain a sheet;
controlling the hot rolling temperature of the sheet billet to be 1150 ℃ and the hot rolling time to be 210mim;
and controlling the final rolling temperature of the sheet blank after hot rolling to be 870 ℃ and the coiling temperature to be 560 ℃.
The carbon content of the high-carbon steel of the embodiment is as follows by mass percent: 0.35%, gauge 7.1mm × 1200mm, and band tissue grade as shown in FIG. 2.
Example 3
A method for reducing the zonal structure level of a hot-rolled strip steel, as shown in fig. 5, specifically comprising:
electromagnetic stirring is carried out in the continuous casting process of molten steel, the current of the electromagnetic stirring is controlled to be 300A, and the frequency of the electromagnetic stirring is 8Hz;
controlling the casting speed of the casting blank to be 1.2m/min, and carrying out dynamic light reduction in the continuous casting process of the molten steel to obtain a sheet;
controlling the hot rolling temperature of the slab to be 1290 ℃ and the hot rolling time to be 150mim;
controlling the final rolling temperature of the plate blank after hot rolling to be 830 ℃ and the coiling temperature to be 640 ℃.
The carbon content of the high-carbon steel of the present example is, in mass percent: 0.3 percent and 3.0mm multiplied by 1100mm in specification.
Example 4
A method for reducing the zonal structure level of a hot-rolled strip steel, as shown in fig. 5, specifically comprising:
electromagnetic stirring is carried out in the continuous casting process of molten steel, the current of the electromagnetic stirring is controlled to be 200A, and the frequency of the electromagnetic stirring is 5Hz;
controlling the casting speed of a casting blank to be 1.1m/min, and carrying out dynamic light reduction in the continuous casting process of the molten steel to obtain a plate;
controlling the hot rolling temperature of the sheet billet to be 1190 ℃, wherein the hot rolling time is 190mim;
and controlling the final rolling temperature of the sheet blank after hot rolling to be 900 ℃ and the coiling temperature to be 560 ℃.
The carbon content of the high-carbon steel of the present example is, in mass percent: 0.5%, specification 3.0mm 1100mm.
Example 5
A method for reducing the zonal structure level of a hot-rolled strip steel, as shown in fig. 5, specifically comprising:
electromagnetic stirring is carried out in the continuous casting process of molten steel, the current of the electromagnetic stirring is controlled to be 250A, and the frequency of the electromagnetic stirring is 7Hz;
controlling the casting speed of the casting blank to be 0.9m/min, and carrying out dynamic light reduction in the continuous casting process of the molten steel to obtain a sheet;
controlling the hot rolling temperature of the sheet billet to be 1250 ℃ and the hot rolling time to be 170mim;
and controlling the final rolling temperature of the sheet blank after hot rolling to be 880 ℃ and the coiling temperature to be 620 ℃.
The carbon content of the high-carbon steel of the present example is, in mass percent: 0.4%, specification 3.0mm 1100mm.
Comparative example 1
The finish rolling temperature in example 1 was changed to 930 ℃ and the coiling temperature was changed to 710 ℃, the same as in example 1, and the band structure grade of the high carbon steel obtained was as shown in FIG. 3.
Comparative example 2
The finishing temperature in example 2 was changed to 900 ℃ and the coiling temperature was changed to 680 ℃ in the same manner as in example 1, and the band structure grade of the high carbon steel obtained was as shown in FIG. 4.
As can be seen from fig. 1 and 3, the band grade was significantly reduced in example 1 as compared to comparative example 1. As can be seen from fig. 2 and 4, the band grade was significantly reduced in example 2 as compared to comparative example 2.
In summary, according to the method for reducing the level of the hot rolled strip steel strip-shaped structure provided by the embodiment of the application, the hot plate structure can be improved by adjusting the steel making and hot rolling processes under the conditions of the existing steel type components, hot rolling production process and equipment by controlling the continuous casting electromagnetic stirring parameters, controlling the pouring speed and dynamic soft reduction, and controlling the furnace time, the finish rolling temperature and the coiling temperature of the plate blank, so that the level of the hot rolled strip-shaped structure is reduced, and the use requirements of customers are met. The method is suitable for high-carbon steel and high-carbon alloy steel, and the principle of the method is suitable for steel making and hot rolling and the process comprising the subsequent processing procedures of pickling, flattening, cold rolling and the like of a hot rolled plate.
Various embodiments of the present application may exist in a range of forms; it should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the application; accordingly, the described range descriptions should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, it is contemplated that the description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the stated range, such as 1, 2, 3, 4, 5, and 6, as applicable regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any number (fractional or integer) recited within the range so indicated.
In this application, where the context requires no explicit explanation, the use of directional words such as "upper" and "lower" in particular refers to the direction of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "includes" and the like mean "including but not limited to". 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. Herein, "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone. Wherein A and B can be singular or plural. As used herein, "at least one" means one or more, and "a plurality" means two or more. "at least one," "at least one of the following," or similar expressions, refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. 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 application. Thus, the present application 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 of reducing the band structure level of a hot rolled steel strip, the method comprising:
electromagnetic stirring is carried out in the continuous casting process of the molten steel, and the current and the frequency of the electromagnetic stirring are controlled;
controlling the casting blank pouring speed, and carrying out dynamic light reduction in the molten steel continuous casting process to obtain a sheet;
controlling the hot rolling temperature and time of the slab;
and controlling the final rolling temperature and the coiling temperature of the plate blank after hot rolling.
2. The method of claim 1, wherein the current of the electromagnetic stirring is ≤ 300A; and/or
The frequency of the electromagnetic stirring is less than or equal to 8Hz.
3. The method according to claim 2, wherein the current of the electromagnetic stirring is 150-300A, and the frequency of the electromagnetic stirring is 4-8Hz.
4. The method according to claim 1, wherein the casting speed is less than or equal to 1.2m/min.
5. The method according to claim 1, wherein the hot rolling temperature is not less than 1150 ℃; and/or
The hot rolling time is more than or equal to 150min.
6. The method as claimed in claim 1, wherein the hot rolling temperature is 1150-1290 ℃ and the hot rolling time is 150-210mim.
7. The method according to claim 1, wherein the finishing temperature is 900 ℃ or less and the coiling temperature is 640 ℃ or less.
8. The method of claim 7, wherein the finish rolling temperature is 830-900 ℃.
9. The method of claim 8, wherein the coiling temperature is 560 to 640 ℃.
10. The method of claim 1, wherein the carbon content of the molten steel is, in mass percent: 0.3 to 0.5 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211284285.7A CN115921807A (en) | 2022-10-20 | 2022-10-20 | Method for reducing banded structure level of hot-rolled strip steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211284285.7A CN115921807A (en) | 2022-10-20 | 2022-10-20 | Method for reducing banded structure level of hot-rolled strip steel |
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